Bright and high-efficiency hybrid perovskite/organic white light-emitting diodes

Perovskite light-emitting diodes (PeLEDs) hold great promise to achieve next-generation lighting technologies and the display industry due to their excellent properties such as high efficiency, and high color purity. However, limited by the preparation process, all-perovskite white LEDs (WLEDs) are still a huge challenge, hindering the commercialization of PeLEDs. Herein, a perovskite/organic hybrid WLED integrated with perovskite and organic units, employing the multi-emitting layer structure which can modulate the exciton recombination region by varying the thickness of the organic unit, is demonstrated. As a result, the perovskite/organic hybrid WLED realizes the highest external quantum efficiency (EQE) of 13.54 % and luminance of 28,503 cd/m2 at 4 nm organic unit, and the corresponding flexible WLED demonstrates a luminance of 17,505 cd/m2 and EQE of 7.92 %. This strategy offers a simple and efficient method for achieving the perovskite-based white electroluminescent emission, which paves the way for the fabricating the highly efficient perovskite WLEDs.