“Researchers have made significant progress in the field of perovskite light-emitting diodes (PeLEDs), introducing an in-situ co-evaporation technique to passivate grain boundary defects and suppress trap states, thereby enhancing the photoluminescence quantum yield. This method offers a solution to improve the efficiency and brightness of thermal-evaporated PeLEDs, laying a foundation for their commercial prospects.”
“Researchers have made significant progress in the field of near-infrared detection technology. By combining NaYF4:4%Er upconversion nanoparticles with perovskite semiconductor layers and utilizing the localized surface plasmon resonance effect of Ag nanorods, they have successfully developed a narrowband upconversion photodetector with a wavelength of 1550 nm. This approach not only enhances upconversion luminescence but also reduces the pump threshold, achieving an optimized responsivity of 48.5 mA/W and a detectivity of 5.7×10^8 Jones. This research provides a simple strategy for constructing stable near-infrared narrowband photodetectors, offering a new solution for the development of high-performance photodetectors.”
“In the field of liquid biopsy for melanoma diagnosis, a new strategy has been developed. Experts have constructed a detection system for circulating tumor cells using high photoluminescence quantum yields metal halide perovskite quantum dots and melanoma-derived exosomes, which significantly enhances detection sensitivity and accuracy.”
摘要:金属离子过量使用会造成环境污染,危及人类健康。因此,对相关金属离子进行检测显得尤为重要。发光金属有机框架(Luminescent metal⁃organic frameworks,LMOFs)因其具备高色纯度、超高孔隙率和可调结构等优势,被视为简单有效且有前途的荧光传感材料。本文以3,5⁃二(4⁃咪唑⁃1⁃基)吡啶(Bip)为主配体,1,4⁃萘二甲酸(1,4⁃ndc)为辅助配体,Ni2+为中心离子,采取溶剂热法合成了一例二维金属有机框架[Ni2(Bip)2(1,4⁃ndc)2(H2O)6](记为CUST⁃756,其中CUST是Changchun University of Science and Technology缩写),并通过合成后修饰法制备了Eu3+@CUST⁃756复合发光材料。利用XRD、FT-IR和XPS对合成的CUST⁃756和Eu3+@CUST⁃756复合材料进行了基础表征。并且采用荧光光谱对样品进行了发光特性、金属离子传感性能及其机理研究。实验结果表明,Eu3+@CUST⁃756在甲醇溶液中具备优异的发光性能和良好的稳定性,Eu3+的引入使得材料可用于金属阳离子Cr3+、Fe3+检测。Cr3+离子的检出限(limit of detection,LOD)为5.44 μmol·L-1;Fe3+离子的LOD为7.51 μmol·L-1,与大多数LMOFs性能相近。