Synergetic Effect of Postsynthetic Water Treatment on the Enhanced Photoluminescence and Stability of CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals
Synergetic Effect of Postsynthetic Water Treatment on the Enhanced Photoluminescence and Stability of CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals
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合成后水处理对 CsPbX3 (X = Cl, Br, I) 钙钛矿纳米晶体增强光致发光和稳定性的协同作用
DOI：
10.1021/acs.chemmater.8b03330
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发表时间：
2018-10-09
影响因子：
8.6
通讯作者：
Xia, Zhiguo
中科院分区：
文献类型：
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作者：
Liu, Ying;Li, Fei;Xia, Zhiguo
所有无机铯铅卤化物CsPbX3（X = Cl、Br、I）钙钛矿纳米晶体（NC）通常被认为是敏感的，甚至在暴露于环境湿度时会分解。在此，我们对所制备的 CsPbX3 NCs 的合成后水处理对光致发光量子产率（PLQY）和稳定性的影响进行了良好的控制研究，发现 CsPbX3 NCs 的表面缺陷层可以溶解到水中，并且我们可以进一步将上清液 CsPbX3 NCs 己烷溶液与水分离，这提高了 CsPbX3 NCs 的光致发光量子产率（PLQY）和稳定性。 CsPbCl3、CsPbBr3、CsPbI3 的 PLQY 分别从 S%、69.3%、68.1% 提高到 78.5%、95.5%、91%。在协同作用下，微量残留水促进了原硅酸四甲酯的水解，从而形成了具有高稳定性的SiO2包覆的CsPbX3 NCs。以稳定发绿光的CsPbBr3/SiO2复合材料为例，与红色K2SiF6:Mn4+结合，在蓝色InGaN芯片上制作发光二极管器件，显示出宽色域（国家电视标准委员会标准的128%），为液晶显示背光应用提供了可能。
All inorganic cesium lead halide CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are generally considered to be sensitive and even decompose when exposed to ambient humidity. Herein, we perform a well-controlled investigation of the effect of postsynthetic water treatment of the as-prepared CsPbX3 NCs on the photoluminescence quantum yields (PLQYs) and stability, and one can find that the surface defective layer of CsPbX3 NCs can be dissolved into water and we can further separate the supernatant CsPbX3 NCs hexane solution from the water, which improves the PLQYs of CsPbCl3, CsPbBr3, CsPbI3 from S%, 69.3%, 68.1% to 78.5%, 95.5%, 91%, respectively. As a synergetic effect, a trace amount of residual water facilitated the hydrolysis of tetramethyl orthosilicate, leading to the formation of SiO2-coated CsPbX3 NCs with high stability. The stable green-emitting CsPbBr3/SiO2 composite is used as an example to combine with red K2SiF6:Mn4+ to fabricate the light-emitting diodes device on the blue InGaN chip, which displays wide color gamut (128% of National Television Standard Committee standard), providing the possibility for liquid-crystal display backlight utilization.