A Simple Phosphine–Oxide Host with a Multi‐insulating Structure: High Triplet Energy Level for Efficient Blue Electrophosphorescence

Abstract

The perfect host? A simple phosphine–oxide host, bis{2-[di(phenyl)phosphino]phenyl}ether oxide (DPEPO) with a high triplet energy level (2.995 eV), was chosen to prove an effective strategy for multi-insulating linkage of highly efficient hosts of blue electrophosphorescence. The structure, photophysical properties, molecular orbitals, and device performance were investigated (see graphic; FMO=frontier molecular orbital). Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by 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.