Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes
- Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes
- Cho, HC; Jeong, SH; Park, MH; Kim, YH; Wolf, C; Lee, CL; Heo, JH; Sadhanala, A; Myoung, N; Yoo, S; Im, SH; Friend, RH; Lee, TW
- Date Issued
- AMER ASSOC ADVANCEMENT SCIENCE
- Organic-inorganic hybrid perovskites are emerging low-cost emitters with very high color purity, but their low luminescent efficiency is a critical drawback. We boosted the current efficiency (CE) of perovskite light-emitting diodes with a simple bilayer structure to 42.9 candela per ampere, similar to the CE of phosphorescent organic light-emitting diodes, with two modifications: We prevented the formation of metallic lead (Pb) atoms that cause strong exciton quenching through a small increase in methylammonium bromide (MABr) molar proportion, and we spatially confined the exciton in uniform MAPbBr3 nanograins (average diameter = 99.7 nanometers) formed by a nanocrystal pinning process and concomitant reduction of exciton diffusion length to 67 nanometers. These changes caused substantial increases in steady-state photoluminescence intensity and efficiency of MAPbBr(3) nanograin layers.
- Article Type
- SCIENCE, vol. 350, no. 6265, page. 1222 - 1225, 2015-12-04
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