TY - JOUR
T1 - Tuning the emission from local excited-state to charge-transfer state transition in quinoxaline-based butterfly-shaped molecules
T2 - Efficient orange OLEDs based on thermally activated delayed fluorescence emitter
AU - Yu, Ling
AU - Wu, Zhongbin
AU - Zhong, Cheng
AU - Xie, Guohua
AU - Wu, Kailong
AU - Ma, Dongge
AU - Yang, Chuluo
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/6/1
Y1 - 2017/6/1
N2 - 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 ΔEST and the nature of T1 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 × 106 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.
AB - 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 ΔEST and the nature of T1 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 × 106 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.
KW - Charge-transfer state transition
KW - High up-conversion rate constant
KW - Organic light-emitting diodes
KW - Thermally activated delayed fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85013746720&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2017.02.035
DO - 10.1016/j.dyepig.2017.02.035
M3 - 文章
AN - SCOPUS:85013746720
SN - 0143-7208
VL - 141
SP - 325
EP - 332
JO - Dyes and Pigments
JF - Dyes and Pigments
ER -