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Unlocking the full potential of organic light-emitting diodes on flexible plastic
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Journal Article
Unlocking the full potential of organic light-emitting diodes on flexible plastic
2011
Overview
Typical high-efficiency organic light-emitting diodes (OLEDs) require exotic high-refractive-index (
n
≥ 1.8) substrates to enhance the outcoupling of trapped light in the device. One of the exciting possibilities of OLEDs is the use of lightweight flexible plastic substrates, which unfortunately have a low refractive index (
n
≤ 1.6). To unlock the full potential of OLEDs on flexible plastic, we report high-efficiency phosphorescent OLEDs using a thin-film outcoupling enhancement method that does not depend on high-index substrates. In these devices, multifunctional anode stacks, consisting of a high-index Ta
2
O
5
optical coupling layer, electrically conductive gold layer and hole-injection MoO
3
layer, are collectively optimized to achieve high efficiency. The maximum external quantum efficiency reaches 63% for green, which remains as high as 60% at >10,000 cd m
–2
.
Using a thin-film outcoupling enhancement method consisting of a weak optical cavity on a flexible substrate with a non-indium-tin-oxide anode, researchers demonstrate phosphorescent organic LEDs with an external quantum efficiency of up to 63% at green wavelengths, which remains as high as 60% at luminous intensities of >10,000 cd m
−2
.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
