Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters

Rangani Wathsala Weerasinghe; John Marques dos Santos; Youhei Chitose; Tomas Matulaitis; Stuart L. Warriner; Debasish Barman; Chin-Yiu Chan; Youichi Tsuchiya; Eli Zysman-Colman; Chihaya Adachi

doi:10.1039/D4CP02664K

Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters†

Rangani Wathsala Weerasinghe,^a John Marques dos Santos,

^b Youhei Chitose,

^ac Tomas Matulaitis,

^b Stuart L. Warriner,^f Debasish Barman,

^a Chin-Yiu Chan,

*^de Youichi Tsuchiya,

*^a Eli Zysman-Colman

*^b and Chihaya Adachi

*^ac

Author affiliations

* Corresponding authors

^a Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Motooka, Nishi, Fukuoka 819-0395, Japan
E-mail: tsuchiya@opera.kyushu-u.ac.jp

^b Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, UK
E-mail: eli.zysman-colman@st-andrews.ac.uk

^c Department of Applied Chemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan
E-mail: adachi@cstf.kyushu-u.ac.jp

^d Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
E-mail: chinychan2@cityu.edu.hk

^e Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China

^f School of Chemistry, University of Leeds, Leeds, UK

Abstract

Two novel deep-blue multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters, 1B-CzCrs and 2B-CzCrs, containing a fused carbazole unit were synthesized. The carbazole contributed to the emergence of TADF in these small molecules. Particularly, organic light-emitting diodes with 1B-CzCrs doped in the mCP host achieve a maximum external quantum efficiency of 12.8% at CIE coordinates of (0.146, 0.062).

Physical Chemistry Chemical Physics

Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters†

Abstract

Supplementary files

Article information

Download Citation

Permissions

Molecular asymmetry and rigidification as strategies to activate and enhance thermally activated delayed fluorescence in deep-blue MR-TADF emitters

Social activity

Search articles by author

Spotlight

Advertisements