Perovskite/Organic Hybrid White Electroluminescent Devices with Stable Spectrum and Extended Operating Lifetime
Denghui Liu, Xinyan Liu, Yiyang Gan, Zhe Liu, Guanwei Sun, Chenyang Shen, Xiaomei Peng, Weidong Qiu, Deli Li, Zhisheng Zhou, Zhenchao Li, Hin‐Lap Yip, Shi‐Jian Su
Abstract
We demonstrate a kind of perovskite/organic hybrid white electroluminescent device, where an ultrathin doping-free organic phosphorescent interlayer is embedded between a p-type hole transport layer and a n-type electron transport layer to give an organic p–i–n heterojunction unit, which is superimposed layer by layer onto a quasi-two-dimensional perovskite layer. The unique carrier transport character of the p-type hole transport layer leads to a broad carrier recombination region approaching the p–i–n heterojunction unit. As a result, pure-red emission from the perovskite layer and sky-blue emission from the organic p–i–n heterojunction were simultaneously achieved to generate white emission with a peak external quantum efficiency of 7.35%, Commission Internationale de L’Eclairage coordinates of (0.424, 0.363), and a low correlated color temperature of 2868 K. More importantly, excellent spectral stability and a greatly enhanced operating lifetime (10-fold longer than those of perovskite-only LEDs) are simultaneously achieved, providing a new path for the development of high-performance white LEDs.