期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202006736
关键词
crystallization manipulation; deep‐ blue emission; interface engineering; perovskite light‐ emitting diodes
类别
资金
- National Natural Science Foundation of China [61520106012, 62075061, 61722404, 51873138, 11874380, 11675252, U1632265]
- National Key Research and Development Program of China [2016YFB0401002, 2016YFB0400700, 2017YFB0701900, 2017YFA0403400]
- 333 program [BRA2019061]
- Collaborative Innovation Center of Suzhou Nano Science Technology
This research proposes a novel crystallization strategy and rational interfacial engineering to enhance deep-blue emission in perovskite grains, resulting in significantly improved device performance for PeLEDs.
Perovskite light-emitting diodes (PeLEDs) are emerging candidates for the applications of solution-processed full-color displays. However, the device performance of deep-blue PeLED still lags far behind that of their red and green counterparts, which is largely limited by low external quantum efficiency (EQE) and poor operational stability. Here, a facile and reliable crystallization strategy for perovskite grains is proposed, with improved deep-blue emission through rational interfacial engineering. By modifying the substrate with potassium cation (K+) as the supplier of heterogeneous nucleation seeds, the interfacial K+-guided grain growth is realized for well-packed perovskite assemblies with high surface coverage and the controlled crystal orientation, leading to the enhanced radiative recombination and hole-transport capabilities. Synergistical boost in device performance is achieved for deep-blue PeLEDs emitting at 469 nm with a peak EQE of 4.14%, a maximum luminance of 451 cd m(-2), and spectrally stable color coordinates of (0.125, 0.076) that matches well with the National Television System Committee (NTSC) standard blue.
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