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5 March 2021 Efficiency improvement for blue triplet-triplet annihilation upconversion organic light-emitting diode
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Abstract
Recently, a new emission mode, triplet-triplet annihilation up conversion (TTAUC), of OLED was proposed with the mechanism as follows: when the carriers recombine at the sensitizer layer with a lower energy bandgap, the generated triplet excitons of sensitizer transfer to the triplet-triplet annihilation (TTA) emitter and emit a higher energy photon. In our experiment, we used tris(8-hydroxyquinolinato)aluminum (Alq3) as sensitizer, 9,10-Bis(2-naphthyl)anthraces (ADN) as TTA emitter and 1,1'-(2,5-Dimethyl-1,4-phenylene)dipyrene (DMPPP) as triplet diffusion singlet blocking (TDSB) layer. To improve the efficiency of TTAUC-OLED, 4,4’ -Bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi), was doped in ADN host. With 6% of DPAVBi doping, no obvious change was observed in electrical characteristics, indicating electron traps from dopant is limited. Maximum EQE achieved EQE= 4.66% in the optimized device.
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Chia-Hsun Chen, Man-kit Leung, Jiun-Haw Lee, Tien-Lung Chiu, and Chi-Feng Lin "Efficiency improvement for blue triplet-triplet annihilation upconversion organic light-emitting diode", Proc. SPIE 11708, Advances in Display Technologies XI, 117080P (5 March 2021); https://doi.org/10.1117/12.2577135
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