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Multifunctional Deep-Blue Thermally Activated Delayed Fluorescence Based on an Oxygen-Bridged Boron Acceptor for Highly Efficient Organic Light-Emitting Diodes

Authors
Kim, JaesungKang, SunwooKim, Taekyung
Issue Date
25-Apr-2024
Publisher
AMER CHEMICAL SOC
Keywords
thermally activated delayed fluorescence (TADF); multiresonance-typeTADF; oxygen-bridged boron core; multifunctionalmaterial; deep-blue fluorescent organic light-emitting diodes
Citation
ACS APPLIED MATERIALS & INTERFACES, v.16, no.19, pp 24999 - 25012
Pages
14
Journal Title
ACS APPLIED MATERIALS & INTERFACES
Volume
16
Number
19
Start Page
24999
End Page
25012
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/33179
DOI
10.1021/acsami.3c19467
ISSN
1944-8244
1944-8252
Abstract
Until now, thermally activated delayed fluorescence (TADF) materials based on bridged boron-based acceptors have been primarily developed as dopants. However, in this study, we synthesized and characterized multifunctional deep-blue TADF materials-t-OBO-DMAC and t-OBO-DPAC-using bridged boron-based acceptors in combination with dimethylacridine or diphenylacridine as donors. These materials serve as both dopants and hosts. Theoretical calculations and experimentally measured photophysical properties of t-OBO-DMAC reveal a smaller singlet-triplet energy difference, higher photoluminescence quantum yield, and more efficient reverse intersystem crossing compared to t-OBO-DPAC. When evaluated as TADF emitters, t-OBO-DMAC and t-OBO-DPAC exhibited maximum external quantum efficiency (EQE) of 14.4 and 7.3% with deep-blue color coordinates of (0.14, 0.11) and (0.15, 0.07), respectively. Both materials were further assessed as hosts in various configurations, including host-only, TADF, phosphorescent, and phosphor-sensitized fluorescence (PSF)-emitting systems. Notably, t-OBO-DMAC demonstrated a high maximum EQE of 13.9% with deep-blue color coordinates of (0.15, 0.07) in a nondoped host-only device. Remarkably, both materials achieved EQEs exceeding 20% in the PSF devices. Our study marks a critical advancement in the field that breaks the conventional boundaries of the dopant and host and demonstrates unprecedented multifunctionalities for advanced organic light-emitting diodes.
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