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Device Architecture and Materials for Organic Light-Emitting Devices - Targeting High Current Densities and Control of the Triplet Concentration (Hardcover, 2011 ed.)
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Device Architecture and Materials for Organic Light-Emitting Devices - Targeting High Current Densities and Control of the Triplet Concentration (Hardcover, 2011 ed.)
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Device Architecture and Materials for Organic Light-Emitting
Devices focuses on the design of new device and material concepts
for organic light-emitting devices, thereby targeting high current
densities and an improved control of the triplet concentration. A
new light-emitting device architecture, the OLED with field-effect
electron transport, is demonstrated. This device is a hybrid
between a diode and a field-effect transistor. Compared to
conventional OLEDs, the metallic cathode is displaced by one to
several micrometers from the light-emitting zone, reducing optical
absorption losses. The electrons injected by the cathode accumulate
at an organic heterojunction and are transported to the
light-emission zone by field-effect. High mobilities for charge
carriers are achieved in this way, enabling a high current density
and a reduced number of charge carriers in the device. Pulsed
excitation experiments show that pulses down to 1 us can be applied
to this structure without affecting the light intensity, suggesting
that pulsed excitation might be useful to reduce the accumulation
of triplets in the device. The combination of all these properties
makes the OLED with field-effect electron transport particularly
interesting for waveguide devices and future electrically pumped
lasers. In addition, triplet-emitter doped organic materials, as
well as the use of triplet scavengers in conjugated polymers are
investigated.
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