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Modeling Electron-Transfer Degradation of Organic Light-Emitting Devices
- Title
- Modeling Electron-Transfer Degradation of Organic Light-Emitting Devices
- Authors
- Moon, Yu Kyung; Jang, Ho Jin; Hwang, Sanju; Kang, Seongsoo; Kim, Sinheui; Oh, Juwon; Lee, Sangheon; Kim, Dongho; Lee, Jun Yeob; You, Youngmin
- Ewha Authors
- 유영민; 이상헌
- SCOPUS Author ID
- 유영민; 이상헌
- Issue Date
- 2021
- Journal Title
- ADVANCED MATERIALS
- ISSN
- 0935-9648
1521-4095
- Citation
- ADVANCED MATERIALS vol. 33, no. 12
- Keywords
- degradation; device lifetime; electron transfer; organic light‐ emitting devices; thermally activated delayed fluorescence
- Publisher
- WILEY-V C H VERLAG GMBH
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- The operational lifetime of organic light-emitting devices (OLEDs) is governed primarily by the intrinsic degradation of the materials. Therefore, a chemical model capable of predicting the operational stability is highly important. Here, a degradation model for OLEDs that exhibit thermally activated delayed fluorescence (TADF) is constructed and validated. The degradation model involves Langevin recombination of charge carriers on hosts, followed by the generation of a polaron pair through reductive electron transfer from a dopant to a host exciton as the initiation steps. The polarons undergo spontaneous decomposition, which competes with ultrafast recovery of the intact materials through charge recombination. Electrical and spectroscopic investigations provide information about the kinetics of each step in the operation and degradation of the devices, thereby enabling the building of mass balances for the key species in the emitting layers. Numerical solutions enable predictions of temporal decreases of the dopant concentration in various TADF emitting layers. The simulation results are in good agreement with experimental operational stabilities. This research disentangles the chemical processes in intrinsic electron-transfer degradation, and provides a useful foundation for improving the longevity of OLEDs.
- DOI
- 10.1002/adma.202003832
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
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