Halide Homogenization for High-Performance Blue Perovskite Electroluminescence.
Halide Homogenization for High-Performance Blue Perovskite Electroluminescence.
复制标题
用于高性能蓝色钙钛矿电致发光的卤化物均质化
DOI:
10.34133/2020/9017871
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Wang J
中科院分区:
文献类型:
--
作者:
Cheng L;Yi C;Tong Y;Zhu L;Kusch G;Wang X;Wang X;Jiang T;Zhang H;Zhang J;Xue C;Chen H;Xu W;Liu D;Oliver RA;Friend RH;Zhang L;Wang N;Huang W;Wang J
Metal halide perovskite light-emitting diodes (LEDs) have achieved great progress in recent years. However, bright and spectrally stable blue perovskite LED remains a significant challenge. Three-dimensional mixed-halide perovskites have potential to achieve high brightness electroluminescence, but their emission spectra are unstable as a result of halide phase separation. Here, we reveal that there is already heterogeneous distribution of halides in the as-deposited perovskite films, which can trace back to the nonuniform mixture of halides in the precursors. By simply introducing cationic surfactants to improve the homogeneity of the halides in the precursor solution, we can overcome the phase segregation issue and obtain spectrally stable single-phase blue-emitting perovskites. We demonstrate efficient blue perovskite LEDs with high brightness, e.g., luminous efficacy of 4.7, 2.9, and 0.4 lm W−1 and luminance of over 37,000, 9,300, and 1,300 cd m−2 for sky blue, blue, and deep blue with Commission Internationale de l'Eclairage (CIE) coordinates of (0.068, 0.268), (0.091, 0.165), and (0.129, 0.061), respectively, suggesting real promise of perovskites for LED applications.
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