Design strategies for achieving high triplet energy electron transporting host materials for blue electrophosphorescence

Linda S. Sapochak; Asanga B. Padmaperuma; Paul A. Vecchi; Hong Qiao; Paul E. Burrows

doi:10.1117/12.684126

5 December 2006 Design strategies for achieving high triplet energy electron transporting host materials for blue electrophosphorescence

Linda S. Sapochak, Asanga B. Padmaperuma, Paul A. Vecchi, Hong Qiao, Paul E. Burrows

Author Affiliations +

Proceedings Volume 6333, Organic Light Emitting Materials and Devices X; 63330F (2006) https://doi.org/10.1117/12.684126
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

High efficiency small molecule organic light emitting devices (OLEDs) based on light emission from an electrophosphorescent dopant dispersed in an organic host matrix are well known. Achieving blue phosphorescent OLEDs is particularly challenging because the host triplet energy should ideally be > 2.8 eV to prevent back-transfer of energy from the dopant to the host matrix resulting in loss of efficiency. A design strategy for developing new host materials with high triplet energies by using phosphine oxide (P=O) moieties as points of saturation in order to build sublimable, electron transporting host materials starting from small, wide bandgap molecular building blocks (i.e., biphenyl, phenyl, naphthalene, octafluorobiphenyl, and N-ethylcarbazole) is described. Electrophosphorescent OLEDs using the organic phosphine oxide compounds as host materials for the sky blue organometallic phosphor, iridium(III)bis(4,6-(di-fluorophenyl)-pyridinato-N,C^2,) picolinate (FIrpic) give maximum external quantum efficiencies of ~ 8% and maximum luminance power efficiencies up to 25 lm/W.

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Linda S. Sapochak, Asanga B. Padmaperuma, Paul A. Vecchi, Hong Qiao, and Paul E. Burrows "Design strategies for achieving high triplet energy electron transporting host materials for blue electrophosphorescence", Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 63330F (5 December 2006); https://doi.org/10.1117/12.684126

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