Near-Unity Red Mn2+ Photoluminescence Quantum Yield of Doped CsPbCl3 Nanocrystals with Cd Incorporation
Near-Unity Red Mn2+ Photoluminescence Quantum Yield of Doped CsPbCl3 Nanocrystals with Cd Incorporation
复制标题
掺入 Cd 的掺杂 CsPbCl3 纳米晶体的近乎一致的红色 Mn2 光致发光量子产率
DOI：
10.1021/acs.jpclett.0c00372
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发表时间：
2020-03-19
影响因子：
5.7
通讯作者：
Zou, Bingsuo
中科院分区：
文献类型：
--
作者：
Ji, Sihang;Yuan, Xi;Zou, Bingsuo
虽然Mn ~（2+）掺杂半导体纳米晶（NC）的研究已经进行了近三十年，但迄今为止，Mn ~（2+）发光的近100%的光致发光（PL）量子产率（QY）还没有实现。本文中，在室温下CdCl 2后处理后，在具有各种Mn 2+掺杂浓度的Mn 2+掺杂的CsPbCl 3 NC中报道了Mn 2+发射的极大改善的PL QY。具体地说，近1 QY和近单指数衰减的红色Mn 2+发射峰在627 nm处的掺杂CsPbCl 3纳米晶体中首次获得。稳态和时间分辨PL谱的温度依赖性表明，CdCl 2后处理显着减少了非辐射缺陷态，增强了从主机到Mn 2+离子的能量转移。此外，Mn 2+：CsPbCl 3 NCs CdCl 2后处理后表现出强大的稳定性和高PL QY后多重纯化。研究结果为制备高性能的白色发光二极管掺杂钙钛矿纳米晶提供了一条有效途径。
Although Mn2+ doping in semiconductor nanocrystals (NCs) has been studied for nearly three decades, the near 100% photoluminescence (PL) quantum yield (QY) of Mn2+ emission has never been realized so far. Herein, greatly improved PL QYs of Mn2+ emissions are reported in Mn2+-doped CsPbCl3 NCs with various Mn2+ doping concentrations after CdCl2 post-treatment at room temperature. Specifically, the near-unity QY and near single-exponential decay of red Mn2+ emission peaking at 627 nm in doped CsPbCl3 NCs are obtained for the first time. The temperature dependence of steady-state and time-resolved PL spectra reveals that the CdCl2 post-treatment significantly reduces the nonradiative defect states and enhances the energy transfer from host to Mn2+ ions. Moreover, the Mn2+:CsPbCl3 NCs after CdCl2 post-treatment exhibit robust stability and high PL QYs after multipurification. The results will provide an effective route to obtain doped perovskite NCs with high performance for white lighting emitting diodes.