TY - JOUR
T1 - Nearly 100% exciton utilization in highly efficient red OLEDs based on dibenzothioxanthone acceptor
AU - Hu, Xiaoxiao
AU - Qin, Yuanyuan
AU - Li, Zhiyi
AU - Gao, Honglei
AU - Gao, Teng
AU - Liu, Guanhao
AU - Dong, Xiangyu
AU - Tian, Naxi
AU - Gu, Xiuxian
AU - Lee, Chun-Sing
AU - Wang, Pengfei
AU - Wang, Ying
PY - 2022/10
Y1 - 2022/10
N2 - Improving the utilization of excitons has always been an important topic for the development of electroluminescence devices. In this work, we designed and synthesized three red TADF emitters TPA-DBT12, TPA-DBT3 and DTPA-DBT by employing dibenzothioxanthone (DBT) acceptor framework to stabilize the locally excited triplet state to participate in the reverse intersystem crossing (RISC) process. The fast RISC process and singlet radiation decay process gave rise to evidently enhanced exciton utilization. All of the red OLEDs based on these materials showed maximum EQE over 11% and high exciton utilization close to 100%. This work not only extend the acceptor framework for red materials but also provide a new perspective for the design of highly efficient red TADF materials with 100% exciton utilization by managing locally excited triplet state.
AB - Improving the utilization of excitons has always been an important topic for the development of electroluminescence devices. In this work, we designed and synthesized three red TADF emitters TPA-DBT12, TPA-DBT3 and DTPA-DBT by employing dibenzothioxanthone (DBT) acceptor framework to stabilize the locally excited triplet state to participate in the reverse intersystem crossing (RISC) process. The fast RISC process and singlet radiation decay process gave rise to evidently enhanced exciton utilization. All of the red OLEDs based on these materials showed maximum EQE over 11% and high exciton utilization close to 100%. This work not only extend the acceptor framework for red materials but also provide a new perspective for the design of highly efficient red TADF materials with 100% exciton utilization by managing locally excited triplet state.
KW - Exciton utilization
KW - Locally excited triplet state
KW - Organic light-emitting diode
KW - Red light
KW - Thermally activated delayed fluorescence
UR - http://www.scopus.com/inward/record.url?scp=85126308424&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85126308424&origin=recordpage
U2 - 10.1016/j.cclet.2021.12.047
DO - 10.1016/j.cclet.2021.12.047
M3 - RGC 21 - Publication in refereed journal
SN - 1001-8417
VL - 33
SP - 4645
EP - 4648
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
IS - 10
ER -