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  • Vol. 44  期 9， 2023 2023年 44卷 第9期

    • Cover Story

      YU Meng,LYU Ying,ZOU Deyue,GUO Xiaoyang,LIU Xingyuan

      摘要：Bloch surface wave （BSW） is an electromagnetic mode in which the light field is localized in the surface layer and propagates along the surface layer of the photonic crystal. In this paper， a PS∶C545T organic luminescence layer was prepared on a one-dimensional photonic crystal， and the fluorescence of the exciton of organic C545T molecules coupled into the BSW mode was observed. By studying the performance of the output light emission of the sample through the hemispherical lens coupling， different characteristics of the conventional luminescence and the BSW mode luminescence of C545T are analyzed and compared. The results show that the coupled BSW mode outputs a ring light spot， which has the characteristics of narrow spatial distribution， linear polarization and adjustable spectral with angle， and is obviously separated from the light spot of the conventional radiation mode. The radiation transition rate of luminous films on one-dimensional photonic crystals is anisotropic， and the BSW mode fluorescence has a faster radiation transition rate. The above luminescence characteristics of BSW mode can be utilized to develop polarized light-emitting devices with certain directivity.  
      关键词：Bloch surface wave;organic materials;polarization;angular distribution;one-dimensional photonic crystal   
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      发布时间：2023-09-28

    • Invited Review

      LI Yishuang,BAO Zhiqiang,ZOU Deyue,GUO Xiaoyang

      摘要：Transparent display is one of the development directions for future displays， with huge application potential in fields such as smart windows， wearable electronic products， virtual reality technology， and touch screens. With the emergence of new luminescent materials such as organic， quantum dots， and perovskites， the brightness， efficiency， and stability of light-emitting diodes have rapidly developed. However， achieving high-performance transparent light-emitting diodes with symmetrical luminescence on both sides remains a challenging task. This article starts from three new luminescent materials， namely organics， quantum dots， and perovskites， and summarizes specific schemes for achieving transparency using different transparent electrodes. It summarizes the characteristics， advantages， and disadvantages of various transparent electrodes， and finally prospects the development of transparent displays.  
      关键词：transparent display;light-emitting diodes;transparent electrodes;luminescent materials   
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      发布时间：2023-09-28

    • Synthesis and Properties of Materials

      MENG Yuan,ZHANG Yan,GUO Xiaoyang,LYU Ying,LIU Xingyuan

      摘要：One-dimensional photonic crystals （1DPCs） are artificially constructed periodic optical dielectric structures. 1DPCs can modulate the luminescent material mainly by defect mode modulation and band-edge mode modulation. 1DPC band-edge mode with a large density of photonic states can effectively modulate the luminescent properties of the luminescent material. In this paper， the fluorescence emission of colloidal quantum dot （CQD） materials coated on the surface of 1DPC is studied. By using different QD materials， different surface film thicknesses， and different angles for fluorescence detection， luminescence characteristics of the samples have been investigated. The results show that 1DPC band edge mode can effectively regulate the luminescence characteristics of CQD films located in the surface layer， effectively enhance the fluorescence emission intensity and narrow the emission linewidth. CQD materials controlled by 1DPC band edge mode have faster fluorescence radiation transition rate. The influence of 1DPC on the luminescent properties of CQD materials is helpful to optimize the design of the device structure， so as to greatly improve the performance of the luminescent devices.  
      关键词：Band edge mode;colloidal quantum dots;photoluminescence;angular distribution;one-dimensional photonic crystal   
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      发布时间：2023-09-28

    • YANG Run,CHEN Haoran,TU Langping,LI Qiqing,CHANG Yulei

      摘要：Improving the upconversion luminescence efficiency is the key to promoting the practical application of upconversion luminescent materials. In the NaErF4@NaYF4 system， the inert NaYF4 shell can inhibit the concentration quenching under high Er3+ doping， and the upconversion luminescence is mainly from the energy transfer upconversion of Er3+-Er3+. In this paper， Er3+ and Yb3+ partition doped NaErF4@NaYbF4@NaYF4 core-shell nanoparticles were prepared by the coprecipitation method， and the energy transfer and back energy transfer processes between Er3+-Yb3+-Er3+ was studied. Since the 808 nm can only excite Er3+ but not Yb3+， under 808 nm excitation， Er3+ harvests the pumping energy and transfers it to Yb3+ and subsequently back to Er3+ due to the protection offered by NaYF4 inert outer shell， which finally enhances the upconversion luminescence of Er3+. When the doping concentration of Yb3+ in the intermediate layer is 100%， the maximum enhancement multiple is 24.9 and 9.79 for green and red upconversion， respectively.  
      关键词：rare earth nanoparticles;upconversion luminescence;back energy transfer;β-NaErF4   
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      发布时间：2023-09-28
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