Multiphosphine‐Oxide Hosts for Ultralow‐Voltage‐Driven True‐Blue Thermally Activated Delayed Fluorescence Diodes with External Quantum Efficiency beyond 20%

Abstract

Highly efficient low-voltage-driven ­true-blue thermally activated ­delayed fluorescence diodes are realized through employing a tri-phosphine oxide host (2,2′,4-tris(di(phenyl) ­phosphoryl)-diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.