Aryl-Annulated [3,2-a] Carbazole-Based Deep-Blue Soluble Emitters for High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with CIEy < 0.1
- Authors
- Hwang, Jinhyo; Koh, Chang Woo; Ha, Jung Min; Woo, Han Young; Park, Sungnam; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 29-12월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- deep-blue emitter; donor engineering; organic light-emitting diode; solution-process; thermally activated delayed fluorescence
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.51, pp.61454 - 61462
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 51
- Start Page
- 61454
- End Page
- 61462
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137596
- DOI
- 10.1021/acsami.1c15659
- ISSN
- 1944-8244
- Abstract
- In this study, we demonstrated two deep-blue TADF emitters, BO-tCzPhICz and BO-tCzDICz, for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). They were synthesized by employing an organoboron acceptor and 9-(3,6-di-tert-butyl-9H-carbazol-9-yl)-5-phenyl-5,12-dihydroindolo[3,2-a]carbazole (tCzPhICz) and 12-(3,6-di-tert-butyl-9H-carbazol-9-yl)-15H-diindolo[2,3-b:1',2',3'-lm]carbazole (tCzDICz) as bulky aryl-annulated [3,2-a] carbazole donors, respectively. Both emitters showed sufficient solubility in organic solvents, narrow deep-blue emission, and small energy difference (Delta EST) between singlet and triplet states, which can be applied to solution-processable deep-blue TADF-OLEDs. Solution-processed OLEDs exploiting these TADF emitters displayed deep-blue electroluminescence with CIEy <0.1, and high external quantum efficiencies of 17.8 and 14.8% were observed for BO-tCzPhICz and BOtCzDICz, respectively. The emitter bearing bulky ICz-based donating units shows highly promising potential for high-efficiency solution-processable deep-blue TADF-OLEDs.
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