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Proceedings Paper

Designing organic phosphine oxide host materials using heteroarmatic building blocks: inductive effects on electroluminescence
Author(s): Linda S. Sapochak; Asanga B. Padmaperuma; Paul A. Vecchi; Xiuyu Cai; Paul E. Burrows
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Paper Abstract

Phosphine oxide substitution of small molecules with high triplet exciton energies allows development of vacuum sublimable, electron transporting host materials for blue OLEDs. Heteroaromatic building blocks (carbazole, dibenzofuran and dibenzothiophene) with ET ~ 3 eV were incorporated into phosphine oxide (PO) structures. External quantum efficiencies (EQEs) at lighting brightness (i.e., 800 cd/m2) reached as high as 9.8% at 5.2V for OLEDs using the heteroaromatic PO hosts doped with the sky blue phosphor, iridium(III)bis(4,6-(di-fluorophenyl)-pyridinato-N,C2,) picolinate (FIrpic). Comparing device properties at a similar current density (i.e., J = 13 mA/cm2) showed the dibenzothiophene-bridged PO compound exhibits the highest EQEs and lowest operating voltages at all phosphor dopant levels. These results are explained with respect to the effects of the inductive phosphine oxide substituents on electrochemical, photophysical and electroluminescence properties of the substituted heteroaromatic building blocks.

Paper Details

Date Published: 19 November 2007
PDF: 11 pages
Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 665506 (19 November 2007); doi: 10.1117/12.740970
Show Author Affiliations
Linda S. Sapochak, Pacific Northwest National Lab. (United States)
Asanga B. Padmaperuma, Pacific Northwest National Lab. (United States)
Paul A. Vecchi, Pacific Northwest National Lab. (United States)
Xiuyu Cai, Pacific Northwest National Lab. (United States)
Paul E. Burrows, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 6655:
Organic Light Emitting Materials and Devices XI
Zakya H. Kafafi; Franky So, Editor(s)

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