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Confined Synthesis of Stable and Uniform CsPbBr3 Nanocrystals with High Quantum Yield up to 90% by High Temperature Solid-State Reaction
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-03-19 , DOI: 10.1002/adom.202002130 Qinggang Zhang 1 , Weilin Zheng 1 , Qun Wan 1 , Mingming Liu 1 , Xiuping Feng 1 , Long Kong 1 , Liang Li 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-03-19 , DOI: 10.1002/adom.202002130 Qinggang Zhang 1 , Weilin Zheng 1 , Qun Wan 1 , Mingming Liu 1 , Xiuping Feng 1 , Long Kong 1 , Liang Li 1
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For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr3/MS@SiO2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
中文翻译：
通过高温固相反应受限合成稳定且均匀的 CsPbBr3 纳米晶体，量子产率高达 90%
对于钙钛矿纳米晶体（NCs）的显示应用，光致发光量子产率（PLQY）、发射线宽和工作稳定性是直接影响光电器件性能的主要参数。高温固态合成被认为是比胶体合成更环保的钙钛矿纳米晶制备工艺。然而，在高温下控制 NCs 的尺寸和尺寸分布相对困难，这通常会导致较低的 PLQY 和更宽的发射。在这里，高度稳定的 CsPbBr 3在高温（600°C）下通过硬模板固态合成成功制备了具有高达 93% 的高 PLQY 和 18 nm 的窄发射线宽的 NC。发现在介孔二氧化硅 (MS) 模板的热稳定和均匀孔中精确限制的 NC 生长是实现高 PLQY 和窄发射的主要原因，预水解密封策略有助于优异的稳定性. 更令人惊讶的是，CsPbBr 3 /MS@SiO 2的发射峰强度是商业化硅酸盐绿色荧光粉的 3.8 倍，当封装在蓝芯片上时，在 450 nm 处具有相同的吸光度，这使其成为理想的下转换用于显示应用的发射器。
更新日期：2021-03-19
中文翻译：
通过高温固相反应受限合成稳定且均匀的 CsPbBr3 纳米晶体，量子产率高达 90%
对于钙钛矿纳米晶体（NCs）的显示应用，光致发光量子产率（PLQY）、发射线宽和工作稳定性是直接影响光电器件性能的主要参数。高温固态合成被认为是比胶体合成更环保的钙钛矿纳米晶制备工艺。然而，在高温下控制 NCs 的尺寸和尺寸分布相对困难，这通常会导致较低的 PLQY 和更宽的发射。在这里，高度稳定的 CsPbBr 3在高温（600°C）下通过硬模板固态合成成功制备了具有高达 93% 的高 PLQY 和 18 nm 的窄发射线宽的 NC。发现在介孔二氧化硅 (MS) 模板的热稳定和均匀孔中精确限制的 NC 生长是实现高 PLQY 和窄发射的主要原因，预水解密封策略有助于优异的稳定性. 更令人惊讶的是，CsPbBr 3 /MS@SiO 2的发射峰强度是商业化硅酸盐绿色荧光粉的 3.8 倍，当封装在蓝芯片上时，在 450 nm 处具有相同的吸光度，这使其成为理想的下转换用于显示应用的发射器。
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