The Study of Perovskite Stoichiometry and Charge Transport Materials for Light Emitting Diode via Vacuum Deposition
Na Eun Jung a, Kwanwook Jung a, Dongguen Shin a, Donghee Kang a, Hyunbok Lee b, Yeonjin Yi a
a Institute of Physics and Applied Physics and van der Waals Materials Research Center, Yonsei University, 50 Yonsei-ro, Seodaemun-Gu, Seoul 03722, Republic of Korea
b Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
Poster, Na Eun Jung, 136
Publication date: 23rd October 2018

Recently, organic-inorganic hybrid perovskites are dragging much research interest with their potential as next-generation emitters. Their bandgap is easily tuned with diverse halide ions and full width at half maximum (FWHM) is narrower than that of organic materials.  To optimize light emitting diodes, charge transport materials and stoichiometry of perovskite emitter should be carefully considered. However, perovskite fabrication utilizing solution process has weakness in terms of uniformity, reproducibility, and reliance to external environment, limiting the optimization of light emitting devices. One of the alternatives to replace solution process is vacuum deposition, which have been successfully adapted to perovskite solar cells with its strengths over reproducibility and environment independent film availability.

Here, we have fabricated organic-inorganic hybrid halide perovskite light emitting diodes through vacuum deposition. We have investigated the effect of charge transport materials and film stoichiometry (deposition ratio between PbBr2 and MABr) on light emitting characteristics. We have optimized device with luminance over 20,000 cd/m2 and EQE over 1% with high reproducibility.

This research was supported by the MOTIE (Ministry of Trade, Industry & Energy (10079558)) and Development of materials and core-technology for future display support program.

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