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Silica coating enhances the stability of inorganic perovskite nanocrystals for efficient and stable down-conversion in white light-emitting devices†
Nanoscale ( IF 5.8 ) Pub Date : 2018-10-18 00:00:00 , DOI: 10.1039/c8nr07022a Fei Zhang 1, 2, 3, 4, 5 , Zhi-Feng Shi 1, 2, 3, 4, 5 , Zhuang-Zhuang Ma 1, 2, 3, 4, 5 , Ying Li 1, 2, 3, 4, 5 , Sen Li 1, 2, 3, 4, 5 , Di Wu 1, 2, 3, 4, 5 , Ting-Ting Xu 1, 2, 3, 4, 5 , Xin-Jian Li 1, 2, 3, 4, 5 , Chong-Xin Shan 1, 2, 3, 4, 5 , Guo-Tong Du 5, 6, 7, 8, 9
Nanoscale ( IF 5.8 ) Pub Date : 2018-10-18 00:00:00 , DOI: 10.1039/c8nr07022a Fei Zhang 1, 2, 3, 4, 5 , Zhi-Feng Shi 1, 2, 3, 4, 5 , Zhuang-Zhuang Ma 1, 2, 3, 4, 5 , Ying Li 1, 2, 3, 4, 5 , Sen Li 1, 2, 3, 4, 5 , Di Wu 1, 2, 3, 4, 5 , Ting-Ting Xu 1, 2, 3, 4, 5 , Xin-Jian Li 1, 2, 3, 4, 5 , Chong-Xin Shan 1, 2, 3, 4, 5 , Guo-Tong Du 5, 6, 7, 8, 9
Affiliation
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Recently, inorganic halide perovskite (CsPbX3, X = Cl, Br, I) quantum dots (QDs) have attracted tremendous research interests because of their great potential for application in the fields of low-cost light sources and displays. However, the unsatisfactory structural and chemical stabilities of such materials are the main obstacles hindering reliable device operation significantly. In this study, we successfully prepared CsPbBr3/silica QD composites through a simple sol–gel reaction by using tetramethoxysilane as a single molecule precursor. The as-prepared CsPbBr3/silica QD composites demonstrated substantially improved stability against heat, light, and environmental oxygen/moisture. Besides, a relatively narrower photoluminescence linewidth and higher quantum yield were achieved compared with that of fresh CsPbBr3 QDs. Furthermore, the CsPbBr3 QDs/silica composites were applied as color-converting layer curing on blue light-emitting diodes (LEDs) for white LED applications. Finally, a high power efficiency of 63.5 lm W−1 was obtained and the light emission could be efficiently sustained over 13 h without any decay in the continuous current mode, demonstrating remarkable operation stability than that reported previously. It can be anticipated that the excellent properties and facile processing technique used here will make perovskite QDs/silica composites attractive for applications in optoelectronics and industrial fields.
中文翻译：
二氧化硅涂层增强了无机钙钛矿纳米晶体的稳定性，可在白光发射器件中高效稳定地向下转换†
近年来，无机卤化物钙钛矿（CsPbX 3，X = Cl，Br，I）量子点（QDs）由于其在低成本光源和显示器领域中的巨大应用潜力而引起了巨大的研究兴趣。然而，这些材料的结构和化学稳定性不令人满意是显着阻碍可靠的设备操作的主要障碍。在这项研究中，我们使用四甲氧基硅烷作为单分子前体，通过简单的溶胶-凝胶反应成功地制备了CsPbBr 3 /二氧化硅QD复合材料。准备好的CsPbBr 3/二氧化硅QD复合材料显示出对热，光和环境氧/湿气的稳定性大大提高。此外，与新鲜的CsPbBr 3 QD相比，实现了相对更窄的光致发光线宽和更高的量子产率。此外，将CsPbBr 3 QDs /二氧化硅复合材料用作颜色转换层固化剂，用于白色LED应用的蓝色发光二极管（LED）。最后，具有63.5 lm W -1的高功率效率获得的光能在连续电流模式下在13 h内有效地维持发光而没有任何衰减，这表明其工作稳定性比以前报道的要好。可以预料，此处使用的优异性能和便捷的加工技术将使钙钛矿QD /二氧化硅复合材料在光电子和工业领域中具有吸引力。
更新日期：2018-10-18
中文翻译：
二氧化硅涂层增强了无机钙钛矿纳米晶体的稳定性，可在白光发射器件中高效稳定地向下转换†
近年来，无机卤化物钙钛矿（CsPbX 3，X = Cl，Br，I）量子点（QDs）由于其在低成本光源和显示器领域中的巨大应用潜力而引起了巨大的研究兴趣。然而，这些材料的结构和化学稳定性不令人满意是显着阻碍可靠的设备操作的主要障碍。在这项研究中，我们使用四甲氧基硅烷作为单分子前体，通过简单的溶胶-凝胶反应成功地制备了CsPbBr 3 /二氧化硅QD复合材料。准备好的CsPbBr 3/二氧化硅QD复合材料显示出对热，光和环境氧/湿气的稳定性大大提高。此外，与新鲜的CsPbBr 3 QD相比，实现了相对更窄的光致发光线宽和更高的量子产率。此外，将CsPbBr 3 QDs /二氧化硅复合材料用作颜色转换层固化剂，用于白色LED应用的蓝色发光二极管（LED）。最后，具有63.5 lm W -1的高功率效率获得的光能在连续电流模式下在13 h内有效地维持发光而没有任何衰减，这表明其工作稳定性比以前报道的要好。可以预料，此处使用的优异性能和便捷的加工技术将使钙钛矿QD /二氧化硅复合材料在光电子和工业领域中具有吸引力。
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