Reliability and consistency are extremely important characteristics of an LED. Any designer looking to design an LED into a lighting system should consider not only how the LED will perform on hour 1 but also on hour 1k, 10k and 100k.
It is evident that most LED deterioration is due to poor thermal management. Excessive heat at the junction can damage the crystal quality, the bond pads, and even alter the chemistry of a Phosphor or an encapsulant material thus making it less transparent. As a general rule of thumb, the more efficiently you can drive heat away from an LED, the more consistent and more reliable your lighting system will be.
SemiLEDs patented MvpLEDTM design maximizes the efficacy of any thermal management system by maximizing the heat transfer rate from the junction to the LED package. Many thermal designs are very good however if the material on which the LED structure is built is a poor conductor of heat, such as Sapphire or Silicon, then the overall efficacy of the system is in question. SemiLEDs uses copper alloy, an excellent conductor of heat, thus eliminating the bottleneck effect.
The effects of SemiLEDs efficient Copper alloy devices can be felt in the lifetime and light quality of packaged chips producing white light. Packages using SemiLEDs LEDs, as opposed to conventional Sapphire LEDs, maintain initial CCT values over time. Packages using Sapphire LEDs experienced a CCT shift of more than 20% towards the blue end of the spectrum, while packages using SemiLEDs LEDs only experienced a CCT shift of 2%. This is due to the heat effects on the phosphor chemistry.