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

Sangwook Park; Hyukmin Kwon; Seyoung Oh; Jongwook Park

doi:10.1117/12.3026071

30 September 2024 High-performance blue OLED using multiresonance thermally activated delayed fluorescence host materials containing hetero atoms

Sangwook Park, Hyukmin Kwon, Seyoung Oh, Jongwook Park

Author Affiliations +

Proceedings Volume 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII; 131220T (2024) https://doi.org/10.1117/12.3026071
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

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 and tetraphenylsilyl groups. The new host materials doped with the conventional v-DABNA blue emitter exhibit a high PLQY greater than 0.82, a high horizontal orientation greater than 88%, and a short PL decay time of 0.96–1.93 μs. The device with TDBA-Si shows high EQE 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, which is enabled by the external heavy-atom effect of Si, increased spin–orbit coupling, inhibition of aggregation by the bulky tetraphenylsilyl groups, and fast RISC of the dopant. It can also be explained by a hot triplet excited-state contribution, high thermal stability, and high horizontal orientation. We achieved a high efficiency greater than 30% and a small roll-off value of 4.9% at 1,000 cd m−2 for the first time using the newly developed TDBA-Si host material. The presentation of OLED results incorporating different heteroatoms is also scheduled.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Sangwook Park, Hyukmin Kwon, Seyoung Oh, and Jongwook Park "High-performance blue OLED using multiresonance thermally activated delayed fluorescence host materials containing hetero atoms", Proc. SPIE 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII, 131220T (30 September 2024); https://doi.org/10.1117/12.3026071

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KEYWORDS

Fluorescence

Organic light emitting diodes

Chemical species

Dopants

Photoluminescence

Quantum devices

Quantum efficiency

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