Novel V-Shaped Bipolar Host Materials for Solution-Processed Thermally Activated Delayed Fluorescence OLEDs
- Authors
- Lee, Dong Won; Hwang, Jinhyo; Kim, Hyung Jong; Lee, Hyoseong; Ha, Jung Min; Woo, Han Young; Park, Sungnam; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 20-10월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- bipolar host; nonconjugated molecule; organic light-emitting diode; solution process; thermally activated delayed fluorescence
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.41, pp.49076 - 49084
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 41
- Start Page
- 49076
- End Page
- 49084
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136025
- DOI
- 10.1021/acsami.1c14098
- ISSN
- 1944-8244
- Abstract
- Three V-shaped host molecules with a cyclohexane linker were successfully synthesized for thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The unipolar host molecules, BBCzC and BTDC, contained two 9-phenyl-9H-3,9'-bicarbazole (PBCz) moieties and two 2,12-di-tertbutyl-7- phenyl-5,9- dioxa-13b-boranaphtho[3,2,1-de]anthracene (PDBNA) moieties, respectively. BCzTC, a bipolar host molecule, consisted of a donor unit, PBCz, and an acceptor unit, PDBNA, connected by a cyclohexane linker. Three host molecules showed good solubility in various organic solvents, making them suitable for solution processing. Among the solution-processed green TADF-OLEDs using three host molecules and a green TADF emitter, the one with BCzTC showed the highest external quantum efficiency of up to 30% with a high power efficiency of 71 lm W-1 and a current efficiency of 102 cd A(-1). Compared with BBCzC and BTDC, BCzTC exhibited a relatively high photoluminescence quantum yield (PLQY), an excellent balance in hole and electron transport properties in the emitting layer, and more efficient energy transfer to the emitter, giving such an excellent device performance.
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