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.
Funding Information
  • NSFC (51373050, 61176020)
  • New Century Excellent Talents Supporting Program of MOE (NCET-12-0706)
  • Program for Innovative Research Team in University (IRT-1237)
  • Science and Technology Bureau of Heilongjiang Province (ZD201402, JC2015002)
  • Education Bureau of Heilongjiang Province (2014CJHB005)
  • Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (141012)

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