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- W4386157123 abstract "The utilization of a suitable hole transport material (HTM) is considered to be an effective strategy to advance the efficiency of OLEDs. High triplet energy (ET) HTMs reduce the exciton quenching at the hole injection layer (HIL)/emissive layer (EML) interface and lead to better device performance. In this study, a high triplet energy (∼2.92 eV) molecular material based on the pyridine-annulated fused-indole scaffold (TW-01) was synthesized and used as a hole transport material for solution-processed OLED fabrication. Moreover, TW-01 possesses well-matched frontier molecular orbital energy levels (HOMO/LUMO) with the emissive layer, which might enhance the hole transportability in the EML. Thermal studies revealed that TW-01 has very good heat tolerance properties with a high melting point. The theoretical simulations were utilized to find a relationship between the geometrical, electrochemical, and photophysical properties of the molecule. The crystal structure analysis confirmed the twisting geometry of the molecule in which the two peripheral phenyl rings have ineffective p-orbital overlapping with the central pyridine-annulated fused-indole unit. The corresponding solution-processed green phosphorescent OLED (PhOLED) achieved good device performance with an external quantum efficiency (EQE) of 15%, and a current efficiency (CE)/power efficiency (PE) of 55 cd/A/48 lm/W, respectively, at a brightness of 100 cd/m2. Also, TW-01 showed a maximum luminescence of ∼24 000 cd/m2 at a low turn-on voltage of 2.5 V. The present study indicates that rationally functionalized pyridine-annulated fused indoles could be potential HTMs for solution-processed OLEDs." @default.
- W4386157123 created "2023-08-26" @default.
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- W4386157123 date "2023-08-25" @default.
- W4386157123 modified "2023-10-16" @default.
- W4386157123 title "Pyridine-Annulated Functional Fused Indole as a Hole Transport Material for Solution-Processed OLEDs" @default.
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- W4386157123 doi "https://doi.org/10.1021/acsaom.3c00156" @default.
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