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.
We present simulation and experimental results to achieve increased light extraction of a substrate emitting
OLED. We present a comparison between a grating surface on the OLED and an array of microlenses at the
interface between substrate and air. This experimentally gives -in both cases- a relative improvement of approx.
30 %. We also demonstrate the concept of a RC2LED, applied to an OLED. The RC2LED is composed by
adding a high, low and high index layers between ITO and glass, i.e. the interface between organic layers and
glass. These extra layers create a cavity which numerically gives a relative improvement of over 60% at the
resonance wavelength of the cavity over a wavelength range of 50-100 nm. The influence of an array of micro
lenses in addition to the RC2 layers is also investigated in this paper.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.