Highly efficient TADF OLEDs with low efficiency roll-off based on novel acridine-carbazole hybrid donor-substituted pyrimidine derivatives
- Authors
- Zhang, Q.[Zhang, Q.]; Sun, S.[Sun, S.]; Chung, W.J.[Chung, W.J.]; Yoon, S.J.[Yoon, S.J.]; Wang, Y.[Wang, Y.]; Guo, R.[Guo, R.]; Ye, S.[Ye, S.]; Lee, J.Y.[Lee, J.Y.]; Wang, L.[Wang, L.]
- Issue Date
- 21-Oct-2019
- Publisher
- Royal Society of Chemistry
- Citation
- Journal of Materials Chemistry C, v.7, no.39, pp.12248 - 12255
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Materials Chemistry C
- Volume
- 7
- Number
- 39
- Start Page
- 12248
- End Page
- 12255
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/13948
- DOI
- 10.1039/c9tc04284a
- ISSN
- 2050-7534
- Abstract
- Dimethyl acridine (Ac) and carbazole (Cz) donors are fused to produce acridine-carbazole hybrid donors 12AcCz (8,8-dimethyl-5-phenyl-8,13-dihydro-5H-indolo[2,3-c]acridine) and 23AcCz (13,13-dimethyl-7-phenyl-7,13-dihydro-5H-indolo[3,2-b]acridine). By combining the TPPM (2,4,6-triphenylpyrimidine) acceptor with the Ac-Cz-fused donors of 12AcCz and 23AcCz, two emitters, 12AcCz-PM (13-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-8,8-dimethyl-5-phenyl-8,13-dihydro-5H-indolo[2,3-c]acridine) and 23AcCz-PM (5-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-13,13-dimethyl-7-phenyl-7,13-dihydro-5H-indolo[3,2-b]acridine), are designed and synthesized. The impact of the different fused topologies of the hybrid donors on the molecular configuration and photophysical and optoelectrical properties is systematically investigated. For 12AcCz-PM, the large steric hindrance between the donor and acceptor compels Ac of 12AcCz to be crooked, which endows it with a relatively planar quasi-axial conformation. No blatant TADF character is observed, but the 12AcCz-PM doped device still presents ultradeep blue emission with CIEx,y of (0.15, 0.05) and a maximum external quantum efficiency (EQEmax) of 6.4%. Whereas, 23AcCz-PM shows a quasi-equatorial conformation and possesses notable TADF behavior. The 23AcCz-PM doped device reachs an EQEmax of 28.4% at low dopant concentration and 26.1% at high dopant concentration. Additionally, low efficiency roll-off (EQEs of 24.8% at 1000 cd m-2 and 20.7% at 5000 cd m-2) further confirms its superiority as a TADF emitter. © 2019 The Royal Society of Chemistry.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Engineering > Chemical Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/13948)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.