Highly Efficient Organic Long-persistent Luminescent System by Improving Photo-Induced Charge Separation process

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H02020
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: Okinawa Institute of Science and Technology Graduate University
• Principal Investigator: Kabe Ryota 沖縄科学技術大学院大学, 有機光エレクトロニクスユニット, 准教授 (00726490)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 蓄光 / 電荷分離 / 有機半導体

Outline of Final Research Achievements

Organic long-persistent luminescence (LPL) materials are capable of storing light energy as charges, which then recombine to emit light over an extended period. However, the amount of charge that can be stored in organic materials is lower compared to inorganic materials, necessitating improvements. In this study, we introduced a charge trapping mechanism to stabilize the charge-separated state in organic materials, resulting in a significant enhancement of LPL efficiency. Additionally, by suppressing electron transfer to oxygen, we successfully developed an organic LPL system that works under air. Through polymerization, we achieved stable LPL without the need to mix different materials.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

蓄光材料は非常誘導灯などに実用化されている材料であるが、高性能な材料はレアメタルを必要とする。本研究の有機蓄光システムはレアメタルなどを一切必要とせず、高分子材料を塗布するだけで蓄光発光を得ることが可能となる。本研究の成果により有機蓄光を大気下でも取り出すことが可能となり、また近赤外発光も実現した。この成果は将来的な有機蓄光の実用化やバイオイメージング用途への応用につながる。