Journal
DYES AND PIGMENTS
Volume 141, Issue -, Pages 325-332Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.02.035
Keywords
Organic light-emitting diodes; Thermally activated delayed fluorescence; Charge-transfer state transition; High up-conversion rate constant
Funding
- National Natural Science Foundation of China [91433201, 61575146]
- National Key Basic Research and Development Program of China (973 program) [2015CB655002, 2013CB834805]
- National Key Research Program [2016YFB0401002]
- Innovative Research Group of Hubei Province [2015CFA014]
Ask authors/readers for more resources
We designed and synthesized a series of new butterfly-shaped D-A-D type compounds with quinoxaline as an electron acceptor. Their photoluminescence (PL) spectra are successfully tuned from green to orange based on the intramolecular charge transfer effect. Moreover, through theoretical and experimental approaches, we have verified the dihedral angles between the donor and acceptor, the value of Delta E-ST and the nature of T-1 play crucial roles in shaping the emissive properties, and we have also successfully tuned the emission type from local excited-state (LE) to charge-transfer state (CT) transition to acquire a TADF molecule. A high rate constant for reverse intersystem crossing (RISC) is up to 1.5 x 10(6) s(-1). The BDQDMAC-based orange TADF OLEDs exhibit a maximum external quantum efficiency of 7.4%, corresponding to a prominent contribution of 97% from the delayed fluorescence to the overall external quantum efficiency. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available