The effect of molecular aggregation of thermally activated delayed fluorescence sensitizers for hyperfluorescence in organic light-emitting diodes

The exciton behavior of a new synthetic material, 11-phenyl-11 H -9,16-dioxa-11-aza-4 b -boraindeno[1,2- a ]naphtho[3,2,1- de ]anthracene (Ph-OBNA), which displays a multi-resonance effect, and bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone (DMAC-DPS) with a donor-acceptor-donor structure w...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-03, Vol.1 (12), p.475-4716
Main Authors: Park, Eun Young, Park, Ji Hyun, Kim, Yun-Hi, Suh, Min Chul
Format: Article
Language:English
Subjects:
Agglomeration
Anthracene
Emitters
Excimers
Excitons
Fluorescence
Organic light emitting diodes
Quantum mechanics
Quenching
Rate constants
Stacking
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Summary:The exciton behavior of a new synthetic material, 11-phenyl-11 H -9,16-dioxa-11-aza-4 b -boraindeno[1,2- a ]naphtho[3,2,1- de ]anthracene (Ph-OBNA), which displays a multi-resonance effect, and bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone (DMAC-DPS) with a donor-acceptor-donor structure was analyzed. First, we conducted quantum mechanical simulations based on long-range theory (LC-ωPBE) to predict k RISC , and we confirmed the effect of the luminescence behavior by analyzing aggregation-caused quenching (ACQ) according to π-π stacking and aggregation-induced emission (AIE) behavior. Actually, thermally activated delayed fluorescence materials showing ACQ and AIE behavior exhibited different triplet-triplet annihilation (TTA) and singlet-triplet annihilation (STA) rate constants. Interestingly, DMAC-DPS exhibited a restricted exciton concentration quenching behavior based on an observed AIE owing to its inhibited molecular stacking behavior. On the other hand, Ph-OBNA demonstrated somewhat reduced TTA and STA behavior due to an ACQ behavior originating from excimer formation at high concentrations. Despite this difference, both materials demonstrated a hyperfluorescence behavior that can be used to achieve moderately high device efficiency compared with that obtained from common fluorescence emitters. DMAC-DPS showing AIE behavior increased TTA and STA, whereas Ph-OBNA showing ACQ behavior showed relatively small TTA and STA values due to the generation of excimers.
ISSN:2050-7526
2050-7534
DOI:10.1039/d1tc04712d