Suppressing intramolecular triplet energy transfer aiming for thermally activated delayed fluorescence molecules

2017 Fiscal Year Final Research Report

• Project/Area Number: 16H06057
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Device related chemistry
• Research Institution: Kyushu University
• Principal Investigator: Goushi Kenichi 九州大学, 工学研究院, 助教 (50462875)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 有機EL / 有機LED / 三重項三重項アップコンバージョン / アントラセン誘導体

Outline of Final Research Achievements

Thermally activated delayed fluorescence (TADF) and transition metal complexes are well known as a way of the utilization of triplet exciton, leading to the nearly 100 % internal electroluminescence (EL) quantum efficiency in organic light-emitting diodes (OLEDs) in visible light region. However, deep blue efficient OLEDs utilizing room temperature phosphorescence and TADF are still challenging due to tight restrictions of molecular design, long exciton lifetime and high triplet energy, leading to non-radiative processes and degradations. Thus, we addressed the development of blue emitters with alternative efficient EL mechanisms. As a result, we found new triplet-triplet upconversion (TTU) mechanism. This result would be helpful for the development of deep blue efficient OLEDs, and open new applications of OLEDs.

Free Research Field

有機光エレクトロニクス