最新刊期
- 摘要：Lanthanide-based double perovskites are ideal candidates for constructing efficient and stable multicolor luminescent systems due to their absence of toxic heavy metals， combined with the structural tunability of the double perovskite matrix and the high color purity of photoluminescence from lanthanide ions. However， most existing materials rely on the introduction of multiple emission centers or the combination of multiple components to achieve multicolor luminescence， which makes it challenging to realize dynamically tunable photoluminescence within a single host material. In this regard， this work reports Bi3+/Eu3+-codoped Cs2NaLuCl6 double perovskite microcrystals， in which excitation wavelength-dependent multicolor dynamic photoluminescence combining host self-trapped exciton （STE） emission and Eu3+ emission is achieved in a single material. Specifically， Bi3+ acts as an efficient sensitizer， exhibiting strong absorption in the 250–380 nm UV region and efficiently transferring excitation energy to Eu3+ luminescent centers. The system displays unique excitation wavelength-dependent photoluminescence， showing STE blue emission under 240 nm excitation， Eu3+ red emission under 466 nm excitation， and mixed blue-red white emission under 280 nm excitation. By varying the excitation wavelength， the proportion of blue and red emission can be widely tuned， enabling continuous color adjustment from blue to white to red， demonstrating multicolor photoluminescence characteristics with dynamic excitation/emission response. On this basis， we constructed a triple-excitation anti-counterfeiting system for three distinctly distinguishable photoluminescence color conversions， significantly enhancing the complexity and security of information encryption and showing promising application prospects in advanced anti-counterfeiting and optical information storage.关键词：double perovskite;phosphors;sensitized luminescence;lanthanide ions;multicolor anti-counterfeiting2|0|0更新时间：2026-07-20
- 摘要：Mechanoluminescent materials can convert mechanical stimuli into visible optical signals and show great potential in stress sensing， anti-counterfeiting， and information recording. However， multifunctional materials that simultaneously possess efficient and stable mechanoluminescent output， multimodal luminescence， good stability and repeatability， and recoverability remain relatively scarce for complex and variable environments. Herein， layered Ca3Ga4O9：xTb3+ gallate luminescent materials were prepared by a high-temperature solid-state method， and Ca3Ga4O9：0.01Tb3+ was selected as a representative sample to systematically investigate its crystal structure， luminescence properties， and luminescence mechanism through a series of structural and optical characterizations. The sample exhibits characteristic green emission of Tb3+ under both ultraviolet and X-ray excitation， together with long-persistent luminescence lasting for more than 200 s. Its mechanoluminescence intensity exhibits a linear dependence on the applied force， while maintaining good stability under repeated loading cycles. Furthermore， the attenuated mechanoluminescence performance can be effectively restored through ultraviolet-light recharging. Thermoluminescence analysis indicates that the dominant trap level of approximately 0.728 eV participates in carrier trapping， release， and recombination processes， thereby promoting efficient mechanoluminescent output. Based on its stress-visualization capability， a two-dimensional handwriting-information recognition application was constructed， demonstrating its potential application value in stress visualization and anti-counterfeiting identification.关键词：mechanoluminescence;Multimodal luminescence;traps;Gallate;Tb3+13|5|0更新时间：2026-07-16
- 摘要：Circularly Polarized Luminescence（CPL）， as an unique chiroptical phenomenon， essentially refers to the asymmetric radiation of left-handed and right-handed circularly polarized light by a luminescent system in the excited state. Its core evaluation parameters include the luminescence quantum yield （ΦPL） and fluorescence dissymmetry factor （glum）. Dye assemblies have emerged as the core platform for constructing high-performance CPL materials due to their prominent advantages such as tunable molecular structures， diverse assembly modes， and excellent optical properties. This review systematically summarizes the research progress of dye assembly-based CPL materials， focusing on the design strategies of CPL-active dye molecules， the construction methods of assemblies， and the mechanisms of chirality transfer. It elaborates on the current applications tatus of these materials in fields including organic optoelectronic devices， information encryption， bioimaging， and conducts an in-depth analysis of the challenges faced by current research and future development directions. By comprehensively organizing relevant domestic and international research achievements in recent years， this review aims to provide theoretical guidance and technical reference for the design， development， and practical application of novel high-performance CPL materials.关键词：Dye Assemblies;circularly polarized luminescence;Chirality Transfer;supramolecular assembly;glum34|14|0更新时间：2026-07-15
- 摘要：Phosphor-converted light-emitting diodes （pc-LEDs） based on a “blue GaN chip + short-wave infrared （SWIR） phosphor” architecture offer several advantages， including compact size， low power consumption， broad emission spectra， low cost， and ease of integration. They are therefore regarded as an important technological route toward portable and intelligent SWIR light sources. However， as the emission wavelength is further red-shifted from the near-infrared region to the SWIR region， phosphor materials typically suffer from significantly enhanced multiphonon nonradiative relaxation， leading to reduced external quantum efficiency， deteriorated thermal stability， and insufficient device output power. Recently， Li et al. reported a class of highly efficient Cr3+-doped ternary rare-earth sulfide phosphors， NaLnS2：Cr3+ （Ln = Lu， Y， Gd）. This study proposes and validates a new paradigm for SWIR luminescence that differs from the conventional crystal-field engineering strategy used in oxide phosphors. Specifically， the strong covalency of the sulfide host induces a pronounced nephelauxetic effect， reducing the effective electron–electron repulsion of Cr3+ 3d electrons and decreasing the energy separation between the 4T2 excited state and the 4A2 ground state， while the low phonon energy and weak electron–phonon coupling of the sulfide lattice suppress nonradiative losses. This synergistic mechanism overcomes the long-standing challenge in Cr3+-doped SWIR phosphors， where long-wavelength emission， high efficiency， and excellent thermal stability have traditionally been difficult to achieve simultaneously.关键词：short-wave infrared luminescence;ternary rare-earth sulfides;Cr3+;phosphor-converted LEDs38|22|0更新时间：2026-07-13
- 摘要：The crystallization quality of perovskite films is a crucial factor dictating the performance of perovskite solar cells （PSCs）. However， the crystallization process inevitably generates a multitude of intrinsic defects， which severely restrict the optoelectronic performance and compromise the environmental stability of the devices. Herein， we propose a defect passivation strategy based on dimeric grain-boundary bridges by innovatively introducing 8-hydroxyquinoline-5-carboxylic acid （HQC） as a bulk dopant in the perovskite. This approach successfully constructs dimeric molecular bridges at the perovskite grain boundaries while simultaneously passivating defects via bidentate chelation. Consequently， the HQC-modified PSCs yield an impressive power conversion efficiency （PCE） of 24.59%. Furthermore， the environmental stability of the devices is significantly enhanced.关键词：perovskite solar cells;dimer;lead defects62|30|0更新时间：2026-07-13
- 摘要：Radiative transitions are quantum-state transitions in matter quantum systems （such as atoms， ions， and molecules） caused by their interaction with the electromagnetic field， and accompanied by the emission or absorption of photons. Their theoretical description involves physical theories including quantum mechanics and quantum electrodynamics， as well as mathematical tools such as spherical tensors and group theory. Focusing on radiative transitions of doped ions in solids， this paper summarizes earlier related theories and aims to concisely introduce fundamental theories and mathematical expressions while maintaining rigor， and to clearly describe the underlying physical pictures and mechanisms. The topics covered include atomic quantum states， the quantized electromagnetic field， multipole radiative transitions and selection rules， stimulated absorption， stimulated emission and spontaneous emission， transition probability and excited-state lifetimes. The article also discusses f–f and 4f–5d transitions of rare-earth ions and d–d transitions of transition-metal ions， involving Judd–Ofelt theory， crystal-field theory， electron–vibration coupling， and the Dorenbos model，as well as statistical analysis， machine learning， and first-principles methods. This work may provide a theoretical reference for the study of rare-earth- and transition-metal-doped luminescent materials.关键词：radiative transition;theory;physical picture;f–f transition;d-d transition;4f–5d transition105|55|0更新时间：2026-07-09
- 摘要：Perovskite solar cells have attracted extensive attention owing to their rapidly increasing power conversion efficiency and solution processability. Among various device architectures， inverted p-i-n structures offer distinct advantages， including low-temperature processing， negligible hysteresis， superior operational stability， and excellent compatibility with tandem devices. As device efficiency continues to advance， the buried interface between the hole transport layer and the perovskite layer has gradually become a critical region affecting both efficiency and stability. This interface strongly affects perovskite nucleation and crystal growth， defect distribution， energy level alignment， charge extraction， and non-radiative recombination， highlighting the necessity of functional interfacial engineering. Oxide materials， featuring excellent chemical stability， favorable interfacial energy level alignment， and tunable surface functionalities， can improve wettability at the buried interface， optimize interfacial contact， passivate interfacial defects， and enhance device stability. This review summarizes recent progress in oxide-based buried interfacial layers for inverted perovskite solar cells， with emphasis on the roles of aluminum oxide and silicon oxide in porous insulating interfacial contacts， fixed-charge passivation， localized dielectric contacts， optical management， stress relaxation， and multifunctional integration. Other oxide interfacial layers， such as hafnium oxide， magnesium oxide， and zirconium oxide， are briefly discussed.关键词：inverted perovskite solar cells;buried interface;oxide functional layer;aluminum oxide;silicon oxide;interface regulation106|58|0更新时间：2026-07-09
- 摘要：Chiral organic-inorganic hybrid metal halides possess unique properties such as circular dichroism， circularly polarized luminescence， nonlinear optics and ferroelectricity， and exhibit broad application prospects in circularly polarized photodetection， circularly polarized light sources， nonlinear optics， ferroelectrics and piezoelectrics. However， most researches on chiral metal halides focus on conventional metal elements， and the exploration of the periodic table remains limited. As f-block elements， rare earth metals feature distinctive electronic configurations and abundant energy levels， endowing them with superior optical performances including wide emission wavelength coverage， high luminescence efficiency and excellent tunability. The introduction of rare-earth ions into chiral organic-inorganic hybrid metal halides is expected to bring new opportunities and possibilities to this research field. On this basis， this review systematically summarizes the research progress of chiral rare-earth halides， aiming to provide valuable references for the further exploration of their chiroptical and magnetic properties as well as their potential applications.关键词：chiral metal halides;circularly polarized luminescence;rare-earth luminescent materials;f-f transition;d-f transition160|79|0更新时间：2026-07-08
- 摘要：Mechanoluminescence （ML） materials exhibit significant application potential in dynamic stress sensing， intelligent anti-counterfeiting， and human-machine interaction due to their ability to directly convert mechanical energy into light. Currently， most high-performance ML materials rely on trap-controlled mechanisms， which require pre-irradiation to populate charge carriers. However， this dependence on pre-charging severely restricts the operational convenience of the materials in real-time and continuous monitoring scenarios. Furthermore， traditional powdered phosphors often suffer from poor environmental stability and significant light scattering losses when integrated into polymer matrices. Therefore， developing novel ML materials that are free from the need for pre-irradiation， possess real-time self-recovery characteristics， and exhibit both high chemical stability and optical transparency has become a critical challenge that urgently needs to be addressed in the field of intelligent sensing. In this work， SrO-Ga2O3-B2O3：Eu3+ transparent glass-ceramics were successfully prepared via a melt-quenching method followed by a post-heat treatment process. XRD and TEM analyses confirmed the homogeneous precipitation of dominant-phase SrGaBO4 nanocrystals within the glass matrix. Under UV excitation， the glass-ceramic displays the characteristic red emission of Eu3+， mainly originating from the 5D0 → 7F2 electric dipole transition. After incorporating the glass-ceramic powder into PDMS to fabricate flexible films， visible red mechanoluminescence （ML） can be generated under mechanical stresses such as stretching， friction， and compression without the need for any pre-irradiation. The emission centers remain highly consistent with those observed in photoluminescence. Thermoluminescence measurements failed to detect any significant defect energy level signals， thereby excluding the trap-controlled release mechanism and confirming that the ML originates primarily from triboelectric-induced excitation. This demonstrates excellent real-time response and self-recovery characteristics， effectively overcoming the bottleneck associated with traditional trap-based materials that require pre-charging. These composite films hold broad application prospects in fields such as dynamic mechanical visualization， wearable sensors， and encrypted anti-counterfeiting， providing vital experimental evidence and theoretical references for the design and development of novel high-performance ML materials that do not require pre-irradiation.关键词：mechanoluminescence;glass-ceramics;Triboelectricity;self-recoverable96|40|0更新时间：2026-07-08
- 摘要：Multi-resonance thermally activated delayed fluorescence （MR-TADF） materials have demonstrated outstanding performance in ultrahigh-definition organic light-emitting diode （OLED） displays. In contrast to blue and green MR-TADF emitters， the development of the red counterpart with excellent color purity remains lag far behind， particularly for single-boron pure-red molecules， primarily due to the derivatization limit of MR polycyclic frameworks and synthetic complexity. Herein， we present a synergistic strategy for a paradigm shift in single-boron pure-red MR-TADF emitters， by incorporating electron-deficient pyrazine-triptycene and electron-donating arylamine substituents into MR parent skeleton. The robust triptycene scaffold not only provides structural rigidity， but also establishes a pronounced steric shielding effect， effectively suppressing non-radiative decay pathways and minimizing molecular structural relaxation. The pyrazine unit extends the π-conjugation length， and the arylamine groups at the periphery of MR fragment enhance the charge transfer effect， concurrently facilitating a bathochromic emission. In virture of the rational molecular design， the MR-TADF emitter exhibits pure-red narrowband emission with a photoluminescence quantum yield of 82%， full width at half maximum of 46 nm/0.15 eV， and Commission International de l’Eclairage coordinates of （0.67， 0.33）， precisely aligning with the National Television Standards Committee （NTSC） standard for the red gamut. In addition， the single-host red MR-OLED achieves a high external quantum efficiency over 20% without using any metal-containing sensitizers.关键词：organic light-emitting diodes;multi-resonance;thermally activated delayed fluorescence;triptycene;pure-red123|65|0更新时间：2026-07-07
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Cs3Cu2I5 Luminescent Solar Concentrators Based on Conical Fluorophore Structures Regulation 增强出版 AI导读
摘要：Luminescent solar concentrators （LSCs）， which combine spectral conversion with waveguide light-harvesting capabilities， hold great promise for building-integrated photovoltaic （BIPV） applications. However， in conventional LSCs， the random distribution of luminescent centers results in isotropic emission， and the devices are generally limited by escape cone losses and reabsorption losses， which reduce the waveguide efficiency. To address these issues， this work employs lead-free metal halide nanocrystals Cs3Cu2I5 with a large Stokes shift as the luminescent material. By constructing a conical fluorophore architecture that spatially confines and directionally arranges the luminescent groups， anisotropic regulation of the emission light field is achieved， thereby enhancing the edge collection probability of waveguide photons. Cs3Cu2I5 NCs were synthesized via a hot-injection method， and LSC devices with single-layer and double-layer conical fluorophore architectures were fabricated. The results demonstrate that Cs3Cu2I5 NCs exhibit a large Stokes shift of approximately 155 nm and characteristic self-trapped exciton （STE） emission. With increasing number of conical fluorophore layers， the LSC devices show higher photocurrent density and external quantum efficiency （EQE） response， with the double-layer device achieving a power conversion efficiency （PCE） of 1.97%. Meanwhile， both architectures maintain high edge waveguide efficiency， indicating that the conical fluorophore structure can enhance light-harvesting capability while preserving satisfactory waveguide transmission performance. These findings suggest that the conical fluorophore architecture can effectively modulate light propagation behavior in LSCs and mitigate escape cone losses， offering a new research perspective for the structural optimization of high-performance luminescent solar concentrators.关键词：Luminescent Solar Concentrator;Lead-free Metal Halides;Escape-cone Loss;Conical Fluorophore99|42|0更新时间：2026-07-07 - 摘要：To address poor concealment， low security level of conventional anti-counterfeiting materials， Sb3+/Er3+ co-doped Cs2ScCl5·H2O luminescent materials were synthesized by one-step hydrothermal method. Its luminescent behavior can be modulated through structure evolution triggered by dehydration of crystalline water at high-temperature. Under ultraviolet excitation， the samples exhibit orange emission originating from the radiative recombination of self-trapped exciton， and the doping of Sb3+ ions effectively boosts the photoluminescence quantum yield （PLQY） to a maximum of 98.36% at the optimal doping concentration； but no up-conversion emission from Er3+ was observed. Upon heating at 260 ℃， the material transformed into Cs3ScCl6： Sb3+， Er3+ and enables Er3+ green up-conversion emission derived from the radiative transition of the 2H11/2 and 4S3/2 energy levels to the ground state 4I15/2. These features endow the material with a multi-mode anti-counterfeiting function. The obtained phosphor is processed into luminescent ink， and thermally activated multi-mode anti-counterfeiting was realized by light-stimulated camouflage， thermally activated irreversible decoding， and binary coding.关键词：anti-counterfeiting;Multi-mode Luminescent materials;thermal activation98|40|0更新时间：2026-07-07
- 摘要：Inkjet printing is a non-contact digital printing technology that forms images or patterns by precisely ejecting tiny ink droplets onto a substrate surface， and it has broad applications in fields such as flexible electronics， displays， and biomedicine. To meet diverse application requirements across these domains， developing programmable inkjet printing technologies is of significant importance. This study investigates the critical roles of dual solvents， ambient humidity， and drying temperature in controlling the morphology of perovskite color-conversion arrays， starting from the dynamics of droplet formation. Pre-synthesized perovskite quantum dot inks are employed， and a dual-solvent strategy using dodecane and toluene is applied to induce Marangoni flow. By modulating the interplay between Marangoni and capillary flows， precisely controlled perovskite color-conversion arrays with various morphologies are achieved. Furthermore， the effects of ambient humidity and drying temperature on array morphology are systematically studied. Finally， uniform red and green perovskite color-conversion arrays are integrated with 460 nm blue Micro-LED chips to realize full-color Micro-LED displays. The research demonstrates that programmable control over process parameters—including dual solvent ratios， ambient humidity， and drying temperature—enables precise fabrication of perovskite quantum dot color-conversion arrays， offering new insights and methods for innovative applications of inkjet printing technology.关键词：Inkjet printing technology;Dual-solvent;Programmable control;Micro-LED full-color display166|76|0更新时间：2026-07-03
- 摘要：Chirality is a fundamental property of living systems， and chiral amino acids differ markedly in bioactivity， metabolism， and toxicological behavior； therefore， selective discrimination of amino acid enantiomers is of great importance in disease diagnosis， pharmaceutical analysis， and forensic identification. As an emerging class of zero-dimensional nanomaterials， chiral carbon dots （Ch-CDs） combine excellent optical properties with favorable biocompatibility and thus offer distinct advantages for enantioselective sensing. This review summarizes the chiral origins， synthetic strategies， recognition mechanisms， and sensing modes of Ch-CDs， with a focus on recent advances in the detection of representative amino acid enantiomers， including cysteine， lysine， tryptophan， arginine， and glutamine. Representative sensing strategies based on metal-ion mediation， metal-free recognition， ratiometric fluorescence， and multimodal readout are systematically compared. Overall， Ch-CDs hold considerable promise for sensitive detection， portable signal readout， and analysis in complex matrices. However， their chirality-structure relationships， signal amplification mechanisms， and standardized evaluation criteria remain insufficiently understood， and some systems are still constrained by dependence on exogenous metal ions， limited anti-interference capability， and poor reproducibility. Future efforts should focus on constructing robust chiral interfaces， clarifying the underlying mechanisms， and integrating microfabricated and intelligent readout platforms to advance amino-acid enantiomer sensing toward higher selectivity， sensitivity， and practical applicability.关键词：chirality;chiral carbon dots;fluorescence sensing mechanisms;amino acid enantiomers140|51|0更新时间：2026-07-03
- 摘要：As neuromorphic computing evolves toward complex environmental perception and intelligent decision-making， multimodal information processing has become increasingly important for improving information utilization efficiency and enhancing environmental cognition capability. Multimodal memristors， which employ two or more physical stimuli such as optical， electrical， thermal and magnetic signals to modulate conductance states cooperatively， have attracted extensive attention owing to their unique advantage in synergistic encoding and computation of multimodal information. Herein， the recent research progress of multimodal memristors for neuromorphic computing is reviewed. The active-layer material systems， including inorganic， organic， and organic-inorganic hybrid materials， are first introduced. Then， the major operating mechanisms， including conductive filament formation， interfacial effects， phase transition， and charge trapping/detrapping processes， are summarized. Furthermore， recent advances in artificial synapse and neuron emulation， neural network computing， and multimodal optoelectronic applications are discussed. Finally， the challenges associated with material design， multi-physical-field synergistic modulation， device stability， and large-scale integration are analyzed， and future development directions are prospected.关键词：multimodal;memristor;Optoelectronic Memristor;Artificial Synapse;neuromorphic computing134|85|0更新时间：2026-07-02
- 摘要：Lead-free perovskite of Cs3Bi2I9 has attracted widespread attention in the field of photodetectors owing to its lead-free eco-friendliness， facile fabrication process， outstanding optoelectronic properties， and robust stability. Deep insights into its intrinsic properties and performance modulation mechanisms are essential for developing high-performance photodetectors. This work systematically reviews the fundamental properties， preparation techniques and performance modulation strategies of Cs3Bi2I9， as well as their advances in the field of photodetectors. We analyze the influence rules of various preparation methods on the structure and properties of Cs3Bi2I9 perovskite， and summarize the modulation mechanisms of ionic doping and heterostructure construction for Cs3Bi2I9 and its corresponding photodetectors. Furthermore， we discuss the progress of Cs3Bi2I9 in X-ray， ultraviolet， visible， and infrared photodetectors. Finally， future development prospects are proposed based on the current research status and critical challenges in this field， aiming to provide innovative insights for the design and fabrication of practical Cs3Bi2I9 perovskite photodetectors.关键词：lead-free perovskite;Cs3Bi2I9;performance regulation;photodetector181|33|0更新时间：2026-07-02
- 摘要：In order to meet the application requirements of frequency modulated continuous wave （FMCW） lidar for ultra-narrow linewidth， high side mode suppression ratio and high power single-frequency light source， an external cavity laser （ECL）based on hybrid integration of semiconductor optical amplifier （SOA） and silicon nitride waveguide was designed and fabricated. The asymmetric Mach-Zehnder interferometer and double micro-ring resonator are used to optimize the cross-section size and dispersion characteristics of silicon nitride waveguide， and the chip integration is realized by combining the lens coupling package scheme. The FMCW lidar verification system is built， and the sweep linearity， ranging， velocity measurement and three-dimensional imaging tests are carried out. The experimental results show that the laser achieves an ultra-narrow intrinsic linewidth of 0.628 kHz， a high side-mode suppression ratio of 58 dB， and an output power of 52.3 mW in the 1550 nm band. The scanning frequency linearity goodness of fit of the radar system is 1-r2=2×10-5， the ranging resolution is 5.90 cm， the maximum absolute error is 2.82 cm， and the linear goodness of fit of the velocity measurement is R2=0.99891， which can complete high-precision three-dimensional point cloud imaging. The hybrid integrated external cavity laser can be well adapted to the FMCW lidar system， providing a high-performance light source scheme for high-precision detection.关键词：FMCW lidar;external cavity laser;silicon nitride waveguide134|37|0更新时间：2026-07-02
- 摘要：A 1550 nm complex-coupled distributed feedback （DFB） semiconductor laser based on a self-aligned high-order surface grating is proposed and experimentally demonstrated. The device is based on an InP multiple-quantum-well epitaxial structure， where the ridge waveguide and high-order surface grating are defined simultaneously in a single etching step， enabling self-aligned periodic effective-index modulation with reduced overlay error and improved spatial registration. By introducing periodic electrode windows on the ridge top for spatially selective current injection， index coupling and gain coupling are simultaneously established within the same resonant cavity. The fabricated device exhibits an actual ridge width of approximately 7.2 μm， a grating period of approximately 8.1 μm， and an etch depth of approximately 1.52 μm. Under room-temperature operation， a maximum output power of 62.7 mW is obtained at an injection current of 720 mA， and the maximum side-mode suppression ratio reaches 42.67 dB. The lasing wavelength shows continuous redshifts with increasing injection current and temperature， with tuning coefficients of approximately 9.51 pm/mA and 0.13 nm/°C， respectively. These results verify the synergistic effect of index coupling from the ridge-top high-order surface grating and gain coupling from the periodic electrode windows， which enhances the single-longitudinal-mode stability of the device. The proposed design avoids regrowth， multiple lithographic alignment steps， and nanoscale grating fabrication， offering a simple and low-cost approach for realizing complex-coupled DFB semiconductor lasers.关键词：self-aligned;high-order surface grating;complex coupling;distributed feedback laser;1550 nm200|46|0更新时间：2026-06-30
- 摘要：Quasi-two-dimensional pure-bromide perovskites are ideal blue light-emitting materials； however， the high hole injection barrier caused by wide bandgap of perovskite and interface defects severely limit the performance of their light-emitting diodes （LEDs）. This work proposes a multifunctional dipolar molecular interface strategy by introducing Sodium 4-（2-bromoethyl）benzenesulfonate （BrBS） dipolar molecules between the hole transport layer and perovskite layer to passivate interface defects and simultaneously improve hole injection. The sulfonate group （-SO3-） of BrBS with lone pair electrons coordinates with undercoordinated Pb2+ at the interface， effectively passivating interfacial trap states and boosting the photoluminescence quantum yield （PLQY） of the perovskite film from 45.8% to 81.1%. Importantly， BrBS can generate an interfacial dipole that reduces the hole injection barrier between the perovskite layer and the hole transport layer from 0.30 eV to 0.12 eV， thereby substantially enhancing hole carrier injection into the perovskite emissive layer. As a result， the fabricated quasi-two-dimensional pure-bromide blue perovskite light-emitting diode （PeLED） achieves a peak external quantum efficiency （EQE） of 12.1% and a maximum luminance of 5398 cd m-2 at an emission wavelength of 490 nm， which are 4.0-fold and 4.7-fold of the control device， respectively. The device demonstrates an operational lifetime of 837 min at an initial luminance of 100 cd m-2.关键词：pure-bromide perovskites;blue light-emitting diodes;dipolar molecule;energy level matching;Defect passivation201|39|0更新时间：2026-06-30
- 摘要：In response to the major application demands of space energy transmission and space defense， the development of high-efficiency， lightweight space laser systems holds significant strategic importance. Direct solar-pumped solid-state laser technology eliminates multiple energy conversion stages， offering notable advantages in system efficiency， thermal management， and structural complexity； however， its performance critically depends on the energy conversion capability of gain media for broadband sunlight. This paper systematically reviews the spectral characteristics， energy level structures， and energy transfer mechanisms of three typical gain media—Nd：YAG， Ce：Nd：YAG， and Cr：Nd：YAG—and comparatively analyzes the research progress of solar-pumped laser oscillators and amplifiers both domestically and internationally. The performance of different gain media is evaluated in terms of output power， optical-to-optical conversion efficiency， and thermal management characteristics. The results indicate that Cr：Nd：YAG ceramics， benefiting from efficient energy transfer and the enhanced cross-relaxation effect at elevated temperatures， can maintain high small-signal gain and conversion efficiency around 450 K， demonstrating outstanding potential for space applications. At the system level， laser amplifiers feature simple structures and high stability， enabling power scaling through multi-stage cascading， making them more suitable than oscillators for space applications requiring high-power， high-energy laser output. Based on the combined advantages of gain medium properties and amplifier configurations， this paper proposes a recommended technical scheme for a solar-pumped laser amplifier oriented toward space applications.关键词：solar pumping;gain medium;laser amplifier;space application183|86|0更新时间：2026-06-30
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