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Device Architecture and Materials for Organic Light-Emitting Devices

Device Architecture and Materials for Organic Light-Emitting Devices

Targeting High Current Densities and Control of the Triplet Concentration

by Sarah Schols
Paperback
Publication Date: 16/10/2014
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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 s 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.
ISBN:
9789400794030
9789400794030
Category:
Spectrum analysis
Format:
Paperback
Publication Date:
16-10-2014
Publisher:
Springer
Country of origin:
Netherlands
Pages:
154
Dimensions (mm):
235x155x9mm
Weight:
0.27kg

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