AUTHOR=Tang Xiangyang , Tao Yanchun , Liu Hui , Liu Futong , He Xin , Peng Qiming , Li Jinyu , Lu Ping 

TITLE=Phenothiazinen-Dimesitylarylborane-Based Thermally Activated Delayed Fluorescence: High-Performance Non-doped OLEDs With Reduced Efficiency Roll-Off at High Luminescence

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00373

DOI=10.3389/fchem.2019.00373

ISSN=2296-2646

ABSTRACT=<p>We report a phenothiazinen-dimesitylarylborane thermally activated delayed fluorescence (TADF) molecule that exhibits high external quantum efficiency (EQE) in non-doped organic light-emitting diodes (OLEDs) at high luminescence. The non-doped device shows green electroluminescence with an emission peak of 540 nm and a maximum EQE of 19.66% obtained at a luminescence of ~170 cd m<sup>−2</sup>. The EQE is still as high as 17.31% at a high luminescence of 1,500 cd m<sup>−2</sup> with small efficiency roll-off.</p>