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Proceedings Paper

Light extraction for a doubly resonant cavity organic LED: the RC2LED
Author(s): Peter Vandersteegen; Saso Mladenovski; Volker van Elsbergen; Georg Gartner; Peter Bienstman; Kristiaan Neyts; Roel Baets
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Paper Abstract

The RC2LED is a substrate emitting OLED which has three additional interference layers between the ITO electrode and the glass substrate. This creates two resonant optical cavities. The RC2LED has 2 resonant optical cavities. The first cavity is also present in regular devices and is formed by metal/organic layers/ITO. The second cavity is formed by 3 additional layers: a high refractive index layer (Nb2O5), a low refractive index layer (SiO2) and a high refractive index layer (Nb2O5). The additional layers introduce a strong wavelength dependent improvement of the extraction efficiency compared to the OLED without the additional layers. Our simulations show an improvement of the extraction efficiency of over 70% over a wavelength range of 75 nm compared to an OLED without the 3 layers. Light extraction is worse compared to the reference OLED for wavelengths outside this wavelength range. the when compared to the OLED. This improvement has been experimentally verified for a green OLED with an emission between 500nm and 650 nm. A numerical study shows a relative improvement of 10% for the luminous power efficiency of a 3 color white OLED with the additional layers. The emitted white corresponds with the light emitted by illuminant A. The WOLED has been composed of a fluorescent blue emitter, green and red phosphorescent emitters.

Paper Details

Date Published: 16 October 2007
PDF: 10 pages
Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 665513 (16 October 2007); doi: 10.1117/12.732524
Show Author Affiliations
Peter Vandersteegen, Univ. Gent, IMEC (Belgium)
Saso Mladenovski, Univ. Gent (Belgium)
Volker van Elsbergen, Philips Technologie GmbH Forschungslaboratorien (Germany)
Georg Gartner, Philips Technologie GmbH Forschungslaboratorien (Germany)
Peter Bienstman, Univ. Gent, IMEC (Belgium)
Kristiaan Neyts, Univ. Gent (Belgium)
Roel Baets, Univ. Gent, IMEC (Belgium)

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

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