Integration of Exciton Donor and Acceptor in a Blue-Emitting Molecule with Zero Radius of Intramolecular Energy Transfer Mechanism for Highly Efficient and Stable Fluorescent OLEDs
- Authors
- Park, Bubae; Kim, Ki Ju; Nam, Hyewon; Park, Bum Joon; Kang, Sunwoo; Oh, Hyoung Yun; Kim, Taekyung
- Issue Date
- 1-Jan-2023
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- intramolecular energy transfer; organic light-emitting diodes; zero radius
- Citation
- ADVANCED OPTICAL MATERIALS, v.11, no.15
- Journal Title
- ADVANCED OPTICAL MATERIALS
- Volume
- 11
- Number
- 15
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/31159
- DOI
- 10.1002/adom.202300291
- ISSN
- 2195-1071
2195-1071
- Abstract
- Multimaterial emission layer (EML) with host and dopant is known for its advantages in efficiency and lifetime for organic light-emitting diodes (OLEDs). However, as the compositions and the mixing ratio in the EML diversify, complex device physics and photophysics and complicated fabrication processes become challenging issues. Herein, a new concept to integrate exciton donor (host) and acceptor (dopant) into a single emitting molecule is suggested. 9-(8,9,10,11-Tetradeuterospiro[benzo[de]anthracene-7,9 '-fluoren]-2'-yl)-9H-carbazole (SBAF-Cz) and 8,9,10,11-tetradeutero-N-(9,9-dimethyl-9H-fluoren-2-yl)-N-phenylspiro[benzo[de]anthracene-7,9 '-fluoren]-3-amine (FPA-SBAF) are used as host and dopant, respectively. By integrating two units, 8,9,10,11-tetradeutero-2 '-(9H-carbazol-9-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-N-phenylspiro[benzo[de]anthracene-7,9 '-fluoren]-3-amine (FPA-SBAF-Cz) is synthesized, and photophysical and electrical properties are characterized. Density functional theory and experimental results consistently reveal that SBAF-Cz and FPA-SBAF are photophysically and electrically independent. The electrical properties of FPA-SBAF-Cz behave independently, while the photophysical properties are the sum of those of SBAF-Cz and FPA-SBAF, which is attributed to the zero radius of intramolecular energy transfer (ZRIET) between donor and acceptor in FPA-SBAF-Cz. The single-component blue OLED with FPA-SBAF-Cz exhibits a maximum external quantum efficiency of 4.18%, which is higher than those of OLEDs with SBAF-CZ:FPA-SBAF multicomponent EMLs. Surprisingly, the device lifetime to 50% decrease from initial luminance is 114 h in FPA-SBAF-Cz OLED, which is 2.2 times longer than that of SBAF-Cz:FPA-SBAF OLEDs.
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