Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 10, Pages 2905-2910Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc06365f
Keywords
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Funding
- National Key R&D Program of China [2016YFB0400703]
- National Natural Science Foundation of China [61475106]
- Natural Science Foundation of Jiangsu Province [BK20151264]
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
- 111 Project
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All-inorganic halide perovskites with superior optoelectronic properties are promising materials for efficient perovskite light-emitting diodes. However, they usually suffer from a large grain size (hundreds of nanometers), high surface roughness and poor stability during the spin coating process. Here, we report a facile strategy to fabricate a uniform and flat CsPbBr3 film. A small amount of lecithin (LE) introduced into CsPbBr3 precursor solution can promote the formation of small CsPbBr3 grains that remarkably improve the uniformity of perovskite films with a surface roughness of about 2.2 nm. Furthermore, the CsPbBr3-LE films display excellent fluorescence stability in ambient air and LED devices based on the CsPbBr3-5 wt% LE film exhibit a current efficiency (CE) of 24 cd A(-1) with an external quantum efficiency (EQE) of 6.5%. Therefore, it is anticipated that the findings of the present study will have great potential to boost the development of PeLEDs.
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