Ultra-stable blue-emitting lead-free double perovskite Cs 2 SnCl 6 nanocrystals enabled by an aqueous synthesis on a microfluidic platform
Ultra-stable blue-emitting lead-free double perovskite Cs 2 SnCl 6 nanocrystals enabled by an aqueous synthesis on a microfluidic platform
复制标题
在微流体平台上通过水相合成实现超稳定的蓝光无铅双钙钛矿 Cs 2 SnCl 6 纳米晶体
DOI：
10.1039/d2nr05510d
复制
发表时间：
2022
期刊：
影响因子：
6.7
通讯作者：
Yang, Fuqian
中科院分区：
文献类型：
--
作者：
Tang, Xiaobing;Wen, Xiyu;Yang, Fuqian
蓝光发射的锡基无铅卤化物钙钛矿纳米晶体（NC）被认为是照明和显示器领域有前途的材料。然而，由于有毒溶剂的使用和光学不稳定性，蓝光NC的工业化制造仍然是一个重大挑战，更不用说大规模合成了。本工作开发了一种蓝色发射无铅卤化物钙钛矿Cs2SnCl6粉末的绿色路线合成方法，其中以去离子水和少量无机酸为溶剂，在微流控平台上实现了Cs2SnCl6粉末的合成。使用 Cs2SnCl6 粉末，我们通过超声波工艺制备 Cs2SnCl6 NC。改变配体（油酸与油胺）的体积比可以改变所制备的NC的光致发光（PL）特性，包括PL峰值波长、PL峰值强度和量子产率。当油酸与油胺体积比为40 μL至10 μL时制备的Cs2SnCl6 NCs的光致发光量子产率（PLQY）最高为13.4%。长期 PL 稳定性测试表明，合成的 Cs2SnCl6 NC 可以在 60 天的时间内保持稳定的 PLQY。这项工作为大规模绿色合成蓝色发光锡基无铅NC（例如Cs2SnX6（Cl、Br和I））及其在光电子领域的应用开辟了一条新途径。
Blue emitting Sn-based lead-free halide perovskite nanocrystals (NCs) are considered to be a promising material in lighting and displays. However, industrialised fabrication of blue-emitting NCs still remains a significant challenge due to the use of toxic solvents and optical instability, not mentioning in large-scale synthesis. In this work, a green-route synthesis of blue-emitting lead-free halide perovskite Cs2SnCl6 powders is developed, in which deionized water with a small amount of inorganic acid is used as the solvent and the synthesis of the Cs2SnCl6 powders is achieved on a microfluidic platform. Using the Cs2SnCl6 powders, we prepare Cs2SnCl6 NCs via an ultrasonication process. Changing the volume ratio of the ligands (oleic acid to oleylamine) can alter the photoluminescence (PL) characteristics of the prepared NCs, including the PL-peak wavelength, PL-peak intensity and quantum yield. The highest photoluminescence quantum yield (PLQY) of 13.4% is achieved by the Cs2SnCl6 NCs prepared with the volume ratio of oleic acid to oleylamine of 40 μL to 10 μL. A long-term PL stability test demonstrates that the as-synthesized Cs2SnCl6 NCs can retain a stable PLQY over a period of 60 days. This work opens up a new path for a large-scale green-route synthesis of blue-emitting Sn-based lead-free NCs, such as Cs2SnX6 (Cl, Br and I), towards their applications in optoelectronics.