AUTHOR=Masuda Yuki , Sasabe Hisahiro , Arai Hiroki , Onuma Natsuki , Kido Junji 

TITLE=High-Efficiency Sky Blue-To-Green Fluorescent Emitters Based on 3-Pyridinecarbonitrile Derivatives

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 7 - 2019

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00254

DOI=10.3389/fchem.2019.00254

ISSN=2296-2646

ABSTRACT=The pyridinecarbonitrile derivative is well known as an acceptor unit in fluorescent materials. However, its use in thermally activated fluorescent emitters (TADF) is very limited compared with the benzenecarbonitile counterparts. Very recently, we developed a series of 4-pyridinecarbonitrile, so-called isonicotinonitrile derivatives, as a highly efficient sky blue-to-green TADF emitters realizing low-drive-voltage OLEDs. In this work, we contributed new design and development for three types of 3-pyridinecarbonitrile-based TADF emitters named 2AcNN, 2PXZNN, and 5PXZNN. Among these emitters, a green emitter, 2PXZNN realized a highly efficient TADF OLED with a maximum external quantum efficiency of over 20%.