For years, cities have been upgrading public lighting infrastructure, going from sodium lamps to LED (light ... When that phosphor coating begins to degrade or delaminate, the blue LED can shine ...

the white light comes from phosphors coating the underlying LED, which emits a deep blue light. The defunct units all showed signs of phosphor degradation. In some cases, the phosphors seemed ...

Through the use of thermographic phosphors, temperatures can be determined from pulsed-illumination-induced fluorescence of thin phosphor coatings applied to turbine engine surfaces of interest. In a ...