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제목   [15.12월] [SCIENCE] 이태우 교수 연구실 Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes   이름  관리자
날짜  2015-12-07 10:28:36 조회  1782 추천  0
첨부   Science-2015-Cho-1222-5-Perovksite LEDs.pdf(942.39KB)


 

:::Abstract:::

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 MAPbBr3 nanograin layers.  

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