用于高效且光谱稳定的蓝光发光二极管的含大阳离子乙铵的钙钛矿
Large cation ethylammonium incorporated perovskite for efficient and spectra stable blue light-emitting diodes.
作者信息
Chu Zema, Zhao Yang, Ma Fei, Zhang Cai-Xin, Deng Huixiong, Gao Feng, Ye Qiufeng, Meng Junhua, Yin Zhigang, Zhang Xingwang, You Jingbi
机构信息
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
出版信息
Nat Commun. 2020 Aug 20;11(1):4165. doi: 10.1038/s41467-020-17943-6.
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 CHCHNH is added in PEA(CsPbBr)PbBr 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(CsEAPbBr)PbBr. 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.
近年来，钙钛矿发光二极管（PeLEDs）取得了显著进展；绿色和红色区域电致发光的外量子效率（EQE）已超过20%，但蓝色区域的效率仍远远落后。在此，在PEA(CsPbBr)PbBr钙钛矿中添加大阳离子CHCHNH，以降低Pb-Br轨道耦合并增加用于蓝色发射的带隙。X射线衍射和核磁共振结果证实，EA已成功取代Cs阳离子，形成PEA(CsEAPbBr)PbBr。该方法将光致发光从绿色区域（508nm）调制到蓝色（466nm），并获得了超过70%的蓝色光致发光量子产率。此外，发射光谱在光照和热应力下稳定。采用含60%EABr的PeLEDs结构，已证明位于488nm的天蓝色电致发光的EQE高达12.1%，这将为PeLEDs的全彩显示铺平道路。
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