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Proceedings Paper

Photoemission studies of organic phosphors doped in electron and hole transport hosts
Author(s): Antti Johannes Maekinen; Ian G. Hill; Zakya H. Kafafi
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Paper Abstract

Using a combination of ultraviolet and x-ray photoelectron spectroscopies (UPS, XPS), we have studied the relative energy level alignment of two phosphorescent guest molecules, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine platinum (PtOEP) and tris(2-phenylpyridine)iridium (Ir(ppy)3), doped in an electron transport host, tris(8-hydroxyquinolinato) aluminum (III) (Alq3), and in a hole transport host, 4,4'-bis(carbazol-9-yl)biphenyl (CBP). In each of the guest-host systems, we find that the vacuum levels of the guest and the host molecules align, and that the position of the highest occupied molecular orbital (HOMO) of the phosphorescent guest is independent of the guest molecule concentration (0.8 - 56% by mass) in the composite films. These results are used to shed light on possible electroluminescence mechanism(s) in the emissive layer of an organic light-emitting device utilizing the studied guest-host structures.

Paper Details

Date Published: 27 February 2002
PDF: 6 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457471
Show Author Affiliations
Antti Johannes Maekinen, U.S. Naval Research Lab. (United States)
Ian G. Hill, U.S. Naval Research Lab. (United States)
Zakya H. Kafafi, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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