光致发光
电致发光
量子产额
钙钛矿(结构)
量子效率
发光二极管
材料科学
蓝移
蓝光
光电子学
谱线
带隙
二极管
分析化学(期刊)
化学
光化学
光学
结晶学
纳米技术
物理
荧光
图层(电子)
色谱法
天文
作者
Zema Chu,Yang Zhao,Fei Ma,Cai‐Xin Zhang,Hui‐Xiong Deng,Feng Gao,Qiufeng Ye,Jiaqi Meng,Zhigang Yin,Qizhou Zhang,Jingbi You
标识
DOI:10.1038/s41467-020-17943-6
摘要
Abstract Perovskite light-emitting diodes (PeLEDs) have showed significant progress in recent years; the external quantum efficiency (EQE) of electroluminescence in green and red regions has exceeded 20%, but the efficiency in blue lags far behind. Here, a large cation CH 3 CH 2 NH 2 + is added in PEA 2 (CsPbBr 3 ) 2 PbBr 4 perovskite to decrease the Pb–Br orbit coupling and increase the bandgap for blue emission. X-ray diffraction and nuclear magnetic resonance results confirmed that the EA has successfully replaced Cs + cations to form PEA 2 (Cs 1- x EA x PbBr 3 ) 2 PbBr 4 . This method modulates the photoluminescence from the green region (508 nm) into blue (466 nm), and over 70% photoluminescence quantum yield in blue is obtained. In addition, the emission spectra is stable under light and thermal stress. With configuration of PeLEDs with 60% EABr, as high as 12.1% EQE of sky-blue electroluminescence located at 488 nm has been demonstrated, which will pave the way for the full color display for the PeLEDs.
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