Stable and Bright Electroluminescent Devices utilizing Emissive 0D Perovskite Nanocrystals Incorporated in a 3D CsPbBr 3 Matrix
Stable and Bright Electroluminescent Devices utilizing Emissive 0D Perovskite Nanocrystals Incorporated in a 3D CsPbBr 3 Matrix
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利用结合在 3D CsPbBr 3 矩阵中的发射 0D 钙钛矿纳米晶体的稳定且明亮的电致发光器件
DOI：
10.1002/adma.202203226
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发表时间：
2022
影响因子：
29.4
通讯作者：
Slinker, Jason D.
中科院分区：
文献类型：
--
作者：
Mishra, Aditya;Bose, Riya;Zheng, Yangzi;Xu, Weijie;McMullen, Reema;Mehta, Abhas B.;Kim, Moon J.;Hsu, Julia W.;Malko, Anton V.;Slinker, Jason D.
与3D CsPbBr 3对应物相比，0 D卤化铯铅钙钛矿Cs4 PbBr 6由于其高效稳健的绿色发射而引起了人们的极大兴趣。然而，对于实用的发光器件而言，抓住上级光致发光特性的优点仍然是难以捉摸的。迄今为止，Cs4 PbBr 6仅被用作高带隙非发光基质，以钝化或提供发光器件中CsPbBr 3的量子/介电限制，并增强其光/热/环境稳定性。为了解决这一差异，设计了一种新的溶剂工程方法，将高度发光的0 D Cs4 PbBr 6纳米晶体（钙钛矿纳米晶体（PNC））掺入3D CsPbBr 3膜中，形成单层钙钛矿发光电化学电池（PeLEC）中的活性发射层。观察到最大外部量子效率和亮度从仅3D PeLEC的2.7%和6050 cd m− 2急剧增加到仅含7%重量的0 D PNC的3D-0 D PNC器件的8.3%和11200 cd m− 2。这种增加的大部分是由0 D PNC的有效固有发射驱动的，而伴随的形态改善也有助于降低漏电流，降低滞后和延长工作寿命（半衰期为129小时），使其成为迄今为止报道的性能最好的LEC之一。
The 0D cesium lead halide perovskite Cs4PbBr6has drawn remarkable interest due to its highly efficient robust green emission compared to its 3D CsPbBr3counterpart. However, seizing the advantages of the superior photoluminescence properties for practical light‐emitting devices remains elusive. To date, Cs4PbBr6has been employed only as a higher‐bandgap nonluminescent matrix to passivate or provide quantum/dielectric confinement to CsPbBr3in light‐emitting devices and to enhance its photo‐/thermal/environmental stability. To resolve this disparity, a novel solvent engineering method to incorporate highly luminescent 0D Cs4PbBr6nanocrystals (perovskite nanocrystals (PNCs)) into a 3D CsPbBr3film, forming the active emissive layer in single‐layer perovskite light‐emitting electrochemical cells (PeLECs) is designed. A dramatic increase of the maximum external quantum efficiency and luminance from 2.7% and 6050 cd m−2for a 3D‐only PeLEC to 8.3% and 11 200 cd m−2for a 3D–0D PNC device with only 7% by weight of 0D PNCs is observed. The majority of this increase is driven by the efficient inherent emission of the 0D PNCs, while the concomitant morphology improvement also contributes to reduced leakage current, reduced hysteresis, and enhanced operational lifetime (half‐life of 129 h), making this one of the best‐performing LECs reported to date.