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Synergetic Effect of Postsynthetic Water Treatment on the Enhanced Photoluminescence and Stability of CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-09-05 00:00:00 , DOI: 10.1021/acs.chemmater.8b03330 Ying Liu 1 , Fei Li 1 , Quanlin Liu 1 , Zhiguo Xia 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-09-05 00:00:00 , DOI: 10.1021/acs.chemmater.8b03330 Ying Liu 1 , Fei Li 1 , Quanlin Liu 1 , Zhiguo Xia 1
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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 5%, 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.
中文翻译：
合成后水处理对CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体增强的光致发光和稳定性的协同作用。
通常认为所有无机铯卤化铯CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体（NCs）在暴露于环境湿度下都是敏感的，甚至会分解。在本文中，我们对制备后的CsPbX 3 NCs的后处理水处理对光致发光量子产率（PLQYs）和稳定性的影响进行了可控的研究，发现CsPbX 3 NCs的表面缺陷层可以是溶解在水中，我们可以进一步从水中分离出上清液CsPbX 3 NCs己烷溶液，从而改善了CsPbCl 3，CsPbBr 3，CsPbI 3的PLQY分别从5％，69.3％，68.1％增至78.5％，95.5％，91％。作为协同作用，痕量的残留水促进了原硅酸四甲酯的水解，从而导致形成具有高稳定性的SiO 2涂层的CsPbX 3 NCs。以稳定的绿色发射CsPbBr 3 / SiO 2复合材料为例，结合红色K 2 SiF 6：Mn 4+在蓝色InGaN芯片上制造了发光二极管器件，该器件显示了宽色域（128％ （美国国家电视标准委员会标准）的规定，为液晶显示器背光源的利用提供了可能性。
更新日期：2018-09-05
中文翻译：
合成后水处理对CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体增强的光致发光和稳定性的协同作用。
通常认为所有无机铯卤化铯CsPbX 3（X = Cl，Br，I）钙钛矿纳米晶体（NCs）在暴露于环境湿度下都是敏感的，甚至会分解。在本文中，我们对制备后的CsPbX 3 NCs的后处理水处理对光致发光量子产率（PLQYs）和稳定性的影响进行了可控的研究，发现CsPbX 3 NCs的表面缺陷层可以是溶解在水中，我们可以进一步从水中分离出上清液CsPbX 3 NCs己烷溶液，从而改善了CsPbCl 3，CsPbBr 3，CsPbI 3的PLQY分别从5％，69.3％，68.1％增至78.5％，95.5％，91％。作为协同作用，痕量的残留水促进了原硅酸四甲酯的水解，从而导致形成具有高稳定性的SiO 2涂层的CsPbX 3 NCs。以稳定的绿色发射CsPbBr 3 / SiO 2复合材料为例，结合红色K 2 SiF 6：Mn 4+在蓝色InGaN芯片上制造了发光二极管器件，该器件显示了宽色域（128％ （美国国家电视标准委员会标准）的规定，为液晶显示器背光源的利用提供了可能性。
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