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White OLEDs

Photonics Spectra
Jul 2010
Novaled AGRequest Info
 
Novaled GmbH has introduced white top-emitting organic light-emitting diodes (OLEDs) with a lifetime exceeding 50,000 h and a power efficiency of 30 lm/W at an initial luminance of 1000 cd/m2. The white top-emitting OLED structure is made on metal substrates. Metal substrates bring advantages such as good heat dissipation, mechanical stability and bended designs, and they enable low-cost roll-to-roll production. The devices were developed using proprietary PIN OLED technology with the company’s doping and host materials in association with a blue flourescent emitting material from SFC Korea. They have an indium tin oxide-free top contact and incorporate a proprietary light extraction material layer to enhance efficiency. This outcoupling material reduces the color shift over a wide viewing angle so that it can hardly be detected by the naked eye.


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GLOSSARY
doping
The addition of impurities to another substance, usually solid, in a controlled manner that produces desired properties. Silicon doping with small amounts of other semimetallic elements increases the number of electrical carriers.
eye
The organ of vision or light sensitivity.  
luminance
Luminous flux emitted from a surface per unit solid angle per unit of area, projected onto a plane normal to the direction of propagation. Also known as brightness and luminous sterance.
power efficiency
The ratio of emitted power to input power.
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