Selenium-Containing Multi-Resonance Thermally Activated Delayed Fluorescence Host Material for Green and Red Phosphorescent OLEDs DOI Open Access

Hyuk-Min Kwon,

Seokwoo Kang,

Sangwook Park

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 2040 - 2040

Published: April 29, 2025

We report the molecular design and synthesis of a novel selenium-containing multi-resonance thermally activated delayed fluorescence (MR-TADF) host material, 3,6-di-tert-butyl-9,16-dioxa-15-selena-4b-boraindeno[2,1-a]naphtho[3,2,1-de]anthracene (TDBA-SePh), for green red phosphorescent organic light-emitting diodes (PhOLEDs). By incorporating selenium into DOBNA-based MR-TADF backbone, reverse intersystem crossing (RISC) process was effectively activated, leading to enhanced utilization triplet excitons. The corresponding RISC rate determined be 3.91 × 104 s-1. When applied PhOLED devices, TDBA-SePh-based OLEDs exhibited higher external quantum efficiency (EQE) reduced roll-off compared conventional mCP-based materials. At luminance 1000 cd m-2, devices values 2.5% 4.3%, respectively. This improvement is attributed incorporation as heteroatom, which accelerates process, thereby suppressing triplet-triplet annihilation (TTA). These results suggest that adopting similar strategy can not only reduce but also enhance device operational stability, offering significant potential future OLED applications.

Language: Английский

Selenium-Containing Multi-Resonance Thermally Activated Delayed Fluorescence Host Material for Green and Red Phosphorescent OLEDs DOI Open Access

Hyuk-Min Kwon,

Seokwoo Kang,

Sangwook Park

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 2040 - 2040

Published: April 29, 2025

We report the molecular design and synthesis of a novel selenium-containing multi-resonance thermally activated delayed fluorescence (MR-TADF) host material, 3,6-di-tert-butyl-9,16-dioxa-15-selena-4b-boraindeno[2,1-a]naphtho[3,2,1-de]anthracene (TDBA-SePh), for green red phosphorescent organic light-emitting diodes (PhOLEDs). By incorporating selenium into DOBNA-based MR-TADF backbone, reverse intersystem crossing (RISC) process was effectively activated, leading to enhanced utilization triplet excitons. The corresponding RISC rate determined be 3.91 × 104 s-1. When applied PhOLED devices, TDBA-SePh-based OLEDs exhibited higher external quantum efficiency (EQE) reduced roll-off compared conventional mCP-based materials. At luminance 1000 cd m-2, devices values 2.5% 4.3%, respectively. This improvement is attributed incorporation as heteroatom, which accelerates process, thereby suppressing triplet-triplet annihilation (TTA). These results suggest that adopting similar strategy can not only reduce but also enhance device operational stability, offering significant potential future OLED applications.

Language: Английский

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