High-performance blue OLED using multiresonance thermally activated delayed fluorescence host materials containing silicon atoms

Dongmin Park, Seokwoo Kang, Chi Hyun Ryoo, Byung Hak Jhun, Seyoung Jung, Thi Na Le, Min Chul Suh, Jaehyun Lee, Mi Eun Jun, Changwoong Chu, Jongwook Park () and Soo Young Park ()
Additional contact information
Dongmin Park: Seoul National University, 1 Gwanak-ro
Seokwoo Kang: Kyung Hee University
Chi Hyun Ryoo: Seoul National University, 1 Gwanak-ro
Byung Hak Jhun: Seoul National University, 1 Gwanak-ro
Seyoung Jung: Seoul National University, 1 Gwanak-ro
Thi Na Le: Kyung Hee University
Min Chul Suh: Kyung Hee University
Jaehyun Lee: Korea Testing & Research Institute
Mi Eun Jun: Samsung Display, 1 Samsung-ro Giheung-Gu
Changwoong Chu: Samsung Display, 1 Samsung-ro Giheung-Gu
Jongwook Park: Kyung Hee University
Soo Young Park: Seoul National University, 1 Gwanak-ro

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract We report three highly efficient multiresonance thermally activated delayed fluorescence blue-emitter host materials that include 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA) and tetraphenylsilyl groups. The host materials doped with the conventional N7,N7,N13,N13,5,9,11,15-octaphenyl-5,9,11,15-tetrahydro-5,9,11,15-tetraaza-19b,20b-diboradinaphtho[3,2,1-de:1’,2’,3’-jk]pentacene-7,13-diamine (ν-DABNA) blue emitter exhibit a high photoluminescence quantum yield greater than 0.82, a high horizontal orientation greater than 88%, and a short photoluminescence decay time of 0.96–1.93 μs. Among devices fabricated using six synthesized compounds, the device with (4-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)phenyl)triphenylsilane (TDBA-Si) shows high external quantum efficiency values of 36.2/35.0/31.3% at maximum luminance/500 cd m−2/1,000 cd m−2. This high performance is attributed to fast energy transfer from the host to the dopant. Other factors possibly contributing to the high performance are a T1 excited-state contribution, inhibition of aggregation by the bulky tetraphenylsilyl groups, high horizontal orientation, and high thermal stability. We achieve a high efficiency greater than 30% and a small roll-off value of 4.9% at 1,000 cd m−2 using the TDBA-Si host material.

Date: 2023
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DOI: 10.1038/s41467-023-41440-1

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