Development of novel organic light-emitting diodes displaying circularly polarized luminescence

2015 Fiscal Year Final Research Report

• Project/Area Number: 26620168
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Organic and hybrid materials
• Research Institution: Kyushu University
• Principal Investigator: Yasuda Takuma 九州大学, 稲盛フロンティア研究センター, 教授 (00401175)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 発光ダイオード / 有機半導体 / 偏光 / フルカラー

Outline of Final Research Achievements

To maximize the efficiency of organic light-emitting diodes (OLEDs), a promising mechanism for electroluminescence, thermally activated delayed fluorescence (TADF), has recently been established. In this study, donor-acceptor-structured luminescent molecules were developed and investigated as new TADF emitters. This set of materials allows systematic fine tuning of the band gap and exhibits efficient TADF emissions that cover the entire visible range from blue to red. On this basis, new circularly polarized luminescent materials having axial chirality have also been developed. OLEDs with high maximum external electroluminescence quantum efficiencies of up to 20% have been demonstrated by using these new emitters.

Free Research Field

機能有機材料化学