Jul 27 2010
OSRAM Opto Semiconductors has successfully increased the red thin-film LED chip’s efficiency by 30%. The efficiency creates new LED applications in the industrial, projection and general lighting applications. Dr. Wolfgang Schmid developed the LED technology at OSRAM.
Experimental results of Red LED
The red InGaAlP thin-film chip delivered a high efficiency of 119 lm/W at 350 mA operating current. The red chip produce a 615 nm wavelength and is housed in a Golden Dragon Plus package. The LED chip’s efficiency is 49% at 70 mA and exceeds 50% at 642 nm wavelength.
Higher efficiency results in lower power utilization and greater output for related applications. New LED designs can be developed as few numbers of chips and less space are required to generate the same level of brightness. Additionally, the cooling process is also reduced since only 50% of the heat has to be removed. High-efficiency can help in developing warm white LED products with better light quality and energy balance via color mixing.
Dr. Wolfgang Schmid stated that the thin-film chip technology will benefit a number of applications, specifically the projection applications. He informed that installation of the thin-film chips in the LED products will begin shortly.