Emissive Perovskite Materials for Blue Electroluminescence Devices

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23631
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Nakamura Tomoya 京都大学, 化学研究所, 助教 (90850371)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: ペロブスカイト / ナノ粒子 / 発光材料

Outline of Final Research Achievements

Lead halide perovskites have attracted attention not only as light absorbing materials for solar cells but also as light emitting materials for solution-processed electroluminescence (EL) devices. In the present work, replacing the long alkyl chain ligands attached to the perovskite nanoparticles with shorter ligands decreases the spacing between the nanoparticles, leading to the improved carrier injection in the EL devices. In addition, we successfully synthesized green-emissive perovskite materials by solid-state reaction using ball-milling, which are more simple and scalable synthetic method compared with conventional solution-based synthesis.

Free Research Field

構造有機化学、有機エレクトロニクス、ペロブスカイト

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した、ペロブスカイトナノ粒子の配位子の交換手法は、ナノ粒子への電荷注入・輸送を改善し、ナノ粒子を用いた塗布型EL素子の特性と耐久性の向上につながる成果である。また、ボールミルによる固体合成は、スケールアップが容易で材料利用効率が高い手法であり、将来の実用化・工業化に向けた知見を与える成果であると言える。