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Construction of high-efficiency indolo[2,3-b]quinoxaline-based emitters through regional functionalization strategy
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DOI：10.1016/j.dyepig.2026.113743.png)
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Abstract
En 中文
To achieve a synergistic enhancement of ultra-high exciton utilization and high radiative transition rates, herein, using 6H-indolo[2,3-b]quinoxaline as the building block, two traditional TADF materials (MeOTPAIQCN-1 and MeOTPAIQCN-2) and two hot exciton materials (DPCzIQCN and TPAIQCN) were successfully synthesized by employing a molecular design strategy based on regional functionalization. By regulating the donor to match the S-1 state with the T-n state, efficient utilization of triplet excitons can be achieved. The frontier molecular orbitals, hole-electron interactions, photophysical properties, electrochemical properties, thermal stabilities and organic electroluminescent performances of these compounds were investigated through theoretical calculations and experimentations. These four compounds exhibited emissions ranging from green to near-infrared light in solid films, and the compound TPAIQCN showed green emission with the fluorescence quantum yield approaching 100% in toluene solution. They also demonstrated excellent thermal stability (T-d > 450 degrees C). Using 3,3 '-di(9H-carbazol-9-yl)-1,1 '-biphenyl (mCBP) as the host material, the four compounds were used as the dopants to fabricate the organic electroluminescence devices via thermal evaporation. The doped device based on TPAIQCN showed green emission with the maximum external quantum efficiency (EQE(max)) of 5.70% and the maximum luminance (L-max) of 12780 cd/m(2) at the doping concentration of 10 wt%, while the MeOTPAIQCN-2 device exhibited yellow emission with the EQE(max) of 8.81% and the L-max of 5930 cd/m(2) at the doping concentration of 10 wt%.
Keywords:
6 H -indolo[2,3-b]quinoxaline
TADF
Hot exciton
Photoluminescence
Electroluminescence
Electroluminescence
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4.2
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2.9W
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