Zhang Weizhuo, Li Xin, Peng Chencheng, Yang Fei, Lian Linyuan, Guo Runda, Zhang Jianbing, Wang Lei
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Nanomaterials (Basel). 2022 Jun 13;12(12):2026. doi: 10.3390/nano12122026.
Colloidal cesium lead halide (CsPbX, X = Cl, Br, and I) perovskite nanocrystals (NCs) demonstrate supreme optical properties in the spectra region of infrared, red, and green. High-performance blue-emitting counterparts are still eagerly required for next-generation full-color displays. However, it is challenging to obtain efficient blue perovskite NCs, especially in a deep blue region with an emission wavelength of around 460 nm or shorter. Herein, calcium halide and ammonium ions are applied simultaneously to modify the CsPb(Br/Cl) NCs in situ to reduce surface defects, finally remarkably enhancing the photoluminescence quantum yield (PLQY) from 13% to 93% with an emission peak at 455 nm and the Commission Internationale de l'Eclairage (CIE) coordinates at (0.147, 0.030), which is close to the requirement of the Rec.2020 standard and also meets the requirement of blue emission in DCI-P3. Bright white emission and a wide color gamut are also achieved by combining the commercial red-emitting and green-emitting phosphors. The combination of time-resolved PL spectra and femtosecond transient absorption results discloses the reason for PLQY improvement as suppressing the nonradiative recombination.
卤化铯铅（CsPbX，X = Cl、Br和I）钙钛矿纳米晶体（NCs）在红外、红色和绿色光谱区域展现出卓越的光学性能。下一代全彩显示器仍迫切需要高性能的蓝色发光对应物。然而，获得高效的蓝色钙钛矿NCs具有挑战性，尤其是在发射波长约为460 nm或更短的深蓝色区域。在此，同时应用卤化钙和铵离子对CsPb(Br/Cl) NCs进行原位修饰以减少表面缺陷，最终显著提高光致发光量子产率（PLQY），从13%提高到93%，发射峰位于455 nm，国际照明委员会（CIE）坐标为(0.147, 0.030)，这接近Rec.2020标准的要求，也满足DCI-P3中蓝色发射的要求。通过结合商用红色发光和绿色发光磷光体，还实现了明亮的白色发射和宽色域。时间分辨PL光谱和飞秒瞬态吸收结果的结合揭示了PLQY提高的原因是抑制了非辐射复合。
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