Design Engineering



General DPN

OSRAM says it has achieved record values of efficiency and lifetime while maintaining the brightness of warm white organic light emitting diodes (OLEDs). Laboratory researchers have demonstrated it is possible to improve two crucial OLED characteristics simultaneously: efficiency and lifetime. Up to now, higher efficiency meant shorter life, and vice-versa.

Dr. Karsten Heuser, Director of OLED Lighting Technology at OSRAM Opto Semiconductors, is pleased with the excellent intermediate results. “Our development team has reached a real milestone for warm white OLEDs with efficiency of 46 lm/W (CIE of 0.46/0.42 measured in the integrated sphere) and a 5000 h lifetime, at a brightness of 1000 cd/m¬≤. With these significant increases, flat OLED light sources are approaching the values of conventional lighting solutions and are therefore becoming attractive for a wide variety of applications.”

The color rendering index (CRI) of the almost 100 cm² prototype is 80. By March 2009, OSRAM researchers expect that a demonstrator for an energy-saving flat OLED light module comprising several tiles will be able to deliver an overall luminous flux of 500 lm from a power consumption of less than 10 W.


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