Rational Design of Carbazole- and Carboline-Based Polymeric Host Materials for Realizing High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diode
- Authors
- Hwang, Jinhyo; Lee, Chiho; Jeong, Ji-Eun; Kim, Chae Yeong; Woo, Han Young; Park, Sungnam; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 19-2월-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- carbazole; carboline; polymeric host; thermally activated delayed fluorescent; solution process; polymer light-emitting diode
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.7, pp.8485 - 8494
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 7
- Start Page
- 8485
- End Page
- 8494
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57622
- DOI
- 10.1021/acsami.9b20279
- ISSN
- 1944-8244
- Abstract
- Recently, various host materials have been developed for solution-processed thermally activated delayed fluorescent organic light-emitting diodes (TADF-OLEDs). Compared with small-molecule hosts, polymeric hosts are advantageous for inducing a uniform distribution and segregation of dopant molecules in the emissive layer without undesired large-scale phase separation. In this study, new polymer hosts were demonstrated, in which a bipolar conjugative moiety consisting of a carbazole (Cz) donor and an alpha-carboline (alpha-Cb) acceptor was bound to the polystyrene backbone through a non-conjugated linker. They exhibited high triplet energies of >2.8 eV, and their emission spectra overlapped with the absorption spectrum of a green TADF emitter, which allowed facile energy transfer from the polymeric host to the small-molecule dopants. High device performance was observed, with external quantum efficiencies (EQEs) of 13.65, 17.09, and 17.48% for solution-processed green TADF-OLEDs using PSCzCz, PSCzCb, and PSCbCz, respectively, as hosts for the EML. The EQEs of bipolar host (PSCzCb and PSCbCz)-based devices were higher than those of unipolar host (poly(N-vinylcarbazole) and PSCzCz)-based devices owing to the well-balanced charge-carrier transport. According to these results, the polymeric host bearing a bipolar Cz and a-Cb coupled moiety is a promising material for solution-processable TADF-OLEDs.
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