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Colour- and structure-stable CsPbBr 3 -CsPb 2 Br 5 compounded quantum dots with tuneable blue and green light emission
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.jallcom.2018.07.073
Pengjie Song , Bo Qiao , Dandan Song , Zhiqin Liang , Di Gao , Jingyue Cao , Zhaohui Shen , Zheng Xu , Suling Zhao

Abstract Even though all-inorganic lead halide perovskite (CsPbX3; X = Cl, Br, I) quantum dots (QDs) with great optoelectronic properties such as high fluorescence quantum yield, facile colour tunability, and high colour purity have been under the spotlight in recent years, their poor stability makes their application in LEDs difficult. In comparison to CsPbBr3 QDs that display green emission, CsPbCl3 QDs with blue light emission contain more defects in the material and exhibit lower fluorescence quantum yield and device service time, which is the bottleneck in realizing blue, green, and red three-base coloured perovskite QD-based LEDs. It is therefore a pressing issue to develop other techniques instead of anion exchange to adjust the light emission of CsPbX3 and simultaneously enhance the stability of the nanocrystals, especially for blue emission. In this work, CsPbBr3 QDs compounded with CsPb2Br5 (CsPbBr3-CsPb2Br5 QDs) with stable blue and green emissions are obtained using improved one-step solution-phase method. CsPb2Br5 can enhance the luminescent colour and structural stability of CsPbBr3 QDs. CsPbBr3-CsPb2Br5 QDs showed greater stability than pure CsPbBr3 QDs in various environments. Moreover, CsPbBr3-CsPb2Br5 QDs are smaller than CsPbBr3 QDs synthesized at the same temperature, which results in blue-shift of the photoluminescence spectra. Owing to the strong stability, their photoluminescence emission peak can be simply and reliably tuned continuously between 480 nm and 520 nm through the reaction temperature.

中文翻译:

颜色和结构稳定的 CsPbBr 3 -CsPb 2 Br 5 复合量子点,具有可调蓝光和绿光发射

摘要 尽管全无机卤化铅钙钛矿 (CsPbX3; X = Cl, Br, I) 量子点 (QDs) 具有高荧光量子产率、易于颜色可调和高色纯度等优异光电特性,但一直备受关注。近年来,它们的稳定性差使得它们在 LED 中的应用变得困难。与绿色发光的CsPbBr3量子点相比,蓝色发光的CsPbCl3量子点材料缺陷较多,荧光量子产率和器件使用寿命较低,是实现蓝、绿、红三基色钙钛矿的瓶颈基于 QD 的 LED。因此,开发其他技术而不是阴离子交换来调节 CsPbX3 的发光并同时提高纳米晶体的稳定性是一个紧迫的问题,尤其是蓝光发射。在这项工作中,使用改进的一步液相法获得了具有稳定蓝色和绿色发射的 CsPbBr3 量子点与 CsPb2Br5(CsPbBr3-CsPb2Br5 量子点)复合。CsPb2Br5 可以增强 CsPbBr3 量子点的发光颜色和结构稳定性。CsPbBr3-CsPb2Br5 量子点在各种环境中表现出比纯 CsPbBr3 量子点更高的稳定性。此外,CsPbBr3-CsPb2Br5量子点比在相同温度下合成的CsPbBr3量子点小,导致光致发光光谱蓝移。由于稳定性强,它们的光致发光发射峰可以通过反应温度在 480 nm 和 520 nm 之间简单可靠地连续调谐。CsPbBr3 QD 与 CsPb2Br5 (CsPbBr3-CsPb2Br5 QD) 复合,具有稳定的蓝色和绿色发射,使用改进的一步液相法获得。CsPb2Br5 可以增强 CsPbBr3 量子点的发光颜色和结构稳定性。CsPbBr3-CsPb2Br5 量子点在各种环境中表现出比纯 CsPbBr3 量子点更高的稳定性。此外,CsPbBr3-CsPb2Br5量子点比在相同温度下合成的CsPbBr3量子点小,导致光致发光光谱蓝移。由于稳定性强,它们的光致发光发射峰可以通过反应温度在 480 nm 和 520 nm 之间简单可靠地连续调谐。CsPbBr3 QD 与 CsPb2Br5 (CsPbBr3-CsPb2Br5 QD) 复合,具有稳定的蓝色和绿色发射,使用改进的一步液相法获得。CsPb2Br5 可以增强 CsPbBr3 量子点的发光颜色和结构稳定性。CsPbBr3-CsPb2Br5 量子点在各种环境中表现出比纯 CsPbBr3 量子点更高的稳定性。此外,CsPbBr3-CsPb2Br5量子点比在相同温度下合成的CsPbBr3量子点小,导致光致发光光谱蓝移。由于稳定性强,它们的光致发光发射峰可以通过反应温度在 480 nm 和 520 nm 之间简单可靠地连续调谐。CsPbBr3-CsPb2Br5 量子点在各种环境中表现出比纯 CsPbBr3 量子点更高的稳定性。此外,CsPbBr3-CsPb2Br5量子点比在相同温度下合成的CsPbBr3量子点小,导致光致发光光谱蓝移。由于稳定性强,它们的光致发光发射峰可以通过反应温度在 480 nm 和 520 nm 之间简单可靠地连续调谐。CsPbBr3-CsPb2Br5 量子点在各种环境中表现出比纯 CsPbBr3 量子点更高的稳定性。此外,CsPbBr3-CsPb2Br5量子点比在相同温度下合成的CsPbBr3量子点小,导致光致发光光谱蓝移。由于稳定性强,它们的光致发光发射峰可以通过反应温度在 480 nm 和 520 nm 之间简单可靠地连续调谐。
更新日期:2018-10-01
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