Aging study of remote luminophore at ambient temperature

Phosphor Convert White Light Emitting Diodes (pc-WLEDs) lamps market share is continuously growing since a few years, replacing traditional products due to their higher efficiency and expected lifetime. In Indonesia, the use of LED lamps increased sharply since the last four years, replacing CFL lamps. The most commonly found pc-WLEDs in the market are Blue-emitting LED coated with yellow phosphor based on silicon matrix. Many literature studies performed accelerated artificial aging of phosphor/silicon composite using oven and thermal plate. The consensus is to use a temperature of 85 °C. This study investigates medium term degradation failure mechanisms of phosphor/silicon material and found that such effect can be observed at ambient temperature. Different degradation modes were also identified.