Issue 12, 2022

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

Abstract

The exciton behavior of a new synthetic material, 11-phenyl-11H-9,16-dioxa-11-aza-4b-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 kRISC, 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.

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

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
02 lis 2021
Accepted
18 stu 2021
First published
19 stu 2021

J. Mater. Chem. C, 2022,10, 4705-4716

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

E. Y. Park, J. H. Park, Y. Kim and M. C. Suh, J. Mater. Chem. C, 2022, 10, 4705 DOI: 10.1039/D1TC04712D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements