Enhancement of performance of OLEDs using double indolo[3,2-b]indole electron-donors based emitter

Nopporn Ruangsupapichat

Organic light-emitting diodes (OLEDs) still received our attention and is necessary to develop various fluorescent materials with improved electroluminescent characteristics. Indolo[3,2-b]indole derivatives have been interested in organic electronics due to high photophysical stability, electron-rich, and rigid aromatic structure. However, such compounds are not widely used in OLED materials. Here we developed new emitter using indolo[3,2-b]indole as double donors in D-A-D type to construct fluorescent OLEDs. One of them (DHID-DPS) demonstrated fluorescence quantum yields in doped films reaching to 32% and possessed some evident of TADF (thermally activated delayed fluorescence) property as well as the doped OLED using DHID-DPS as the emitter displaying a blue-green emission with a maximum EQE value of 3.86% and a high brightness up to 12,860 cd m-2 .

Reference:
“Enhancement of performance of OLEDs using double indolo[3,2-b]indole electron-donors based emitter”
S. Tongsuk, R. Malatong, T. Unjarern, C. Wongkaew, P. Surawatanawong, T. Sudyoadsuk, V. Promarak,
N. Ruangsupapichat J. Lumin. 2021, 238, 118287.