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Proceedings Paper

Tuning charge balance in PHOLEDs with ambipolar host materials to achieve high efficiency
Author(s): Asanga B. Padmaperuma; Philip K. Koech; Lelia Cosimbescu; Evgueni Polikarpov; James S. Swensen; Neetu Chopra; Franky So; Linda S. Sapochak; Daniel J. Gaspar
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Paper Abstract

The efficiency and stability of blue organic light emitting devices (OLEDs) continue to be a primary roadblock to developing organic solid state white lighting. For OLEDs to meet the high power conversion efficiency goal, they will require both close to 100% internal quantum efficiency and low operating voltage in a white light emitting device.1 It is generally accepted that such high quantum efficiency, can only be achieved with the use of organometallic phosphor doped OLEDs. Blue OLEDs are particularly important for solid state lighting. The simplest (and therefore likely the lowest cost) method of generating white light is to down convert part of the emission from a blue light source with a system of external phosphors.2 A second method of generating white light requires the superposition of the light from red, green and blue OLEDs in the correct ratio. Either of these two methods (and indeed any method of generating white light with a high color rendering index) critically depends on a high efficiency blue light component.3

Paper Details

Date Published: 28 August 2009
PDF: 9 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74150H (28 August 2009); doi: 10.1117/12.826905
Show Author Affiliations
Asanga B. Padmaperuma, Pacific Northwest National Lab. (United States)
Philip K. Koech, Pacific Northwest National Lab. (United States)
Lelia Cosimbescu, Pacific Northwest National Lab. (United States)
Evgueni Polikarpov, Pacific Northwest National Lab. (United States)
James S. Swensen, Pacific Northwest National Lab. (United States)
Neetu Chopra, Univ. of Florida (United States)
Franky So, Univ. of Florida (United States)
Linda S. Sapochak, Pacific Northwest National Lab. (United States)
National Science Foundation (United States)
Daniel J. Gaspar, Pacific Northwest National Lab. (United States)


Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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