Creation of Electric Field Responsive Organic Circularly Polarized Light Emitting Diode (ECP-OLED)

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K18940
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
• Research Institution: Kindai University
• Principal Investigator: Imai Yoshitane 近畿大学, 理工学部, 教授 (80388496)
• Project Period (FY): 2021-07-09 – 2024-03-31
• Keywords: 円偏光発光 / CPL / 磁気円偏光発光 / MCPL / 円偏光電界発光 / CPEL / 円偏光有機発光ダイオード / CP-OLED

Outline of Final Research Achievements

There are two types of light, left-rotating and right-rotating, known as circularly polarised luminescence (CPL). Generally, optically active compounds are required to obtain the two types of left- and right-rotating CPLs.
In this study, CPL was successfully emitted from optically inactive perovskite luminescent materials, organic iridium luminescent materials and organic iridium light-emitting diodes (OLEDs) by applying an external magnetic field. Furthermore, by combining liquid crystal molecules with optically active perylenediimide luminophores, they succeeded in creating a liquid crystal device in which the rotational direction of the CPL can be controlled by switching the electric field off and on.

Free Research Field

不斉光化学

Academic Significance and Societal Importance of the Research Achievements

本研究成果を用いることにより、光学不活性な化合物からも回転する光CPLを取り出すことが可能となり、発光体開発の幅が格段に広がった。さらに、円偏光発光(CPL)のみならず、これら発光体を組み込んだ有機発光ダイオード(OLED)からも、円偏光電界発光(CPEL)の取り出しに成功しており、材料開発の幅も格段に広がった。電場のOFF-ONによる、CPLの回転方向制御は、新しいフォトスイッチとしての活用が期待される。