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Highly efficient organic light-emitting diodes

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Geplaatst op 13 augustus 2011 - 15:56

Highly efficient organic light-emitting diodes

Organic light-emitting diodes (OLEDs) are seen as a promising replacement for the liquid-crystal displays (LCDs) used in many flat-screen televisions because they are cheaper to mass-produce. Zhikuan Chen at the A*STAR Institute of Materials Research and Engineering and co-workers have now shown how meticulous engineering of fluorescent molecules can dramatically increase OLED efficiency.

Conventional light-emitting diodes are made of inorganic crystals such as gallium arsenide. OLEDS, on the other hand, utilize carbon-based materials that can be made flexible. Today, OLED technology is commonly used to make large-area outdoor displays and wearable displays. However, further improvements in operation efficiency are required if OLEDs are to become truly competitive against the alternative options.

Chen and his co-workers have now reported blue light-emitting devices that reach an external quantum efficiency (EQE) of as high as 9.4%óalmost double the classical upper limit of 5% for fluorescence-based OLEDs. ďThis improvement is important because higher efficiency means a lower driving voltage and thus lower power consumption and increased device lifetime,Ē explains Chen.

Lees verder: http://www.physorg.c...ing-diodes.html

Bron: PhysOrg
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