Category: Transient Plane Source
Keywords: 2500 S, ceramic phosphor plate, ceramics, light-emitting diode (LED) applications, Lu3Al5O12:Ce3+ (LuAG:Ce), magnesium oxide (MgO), performance degradation, photoluminescence (PL) intensities, polyvinyl acetate (PVA), Powders, Silicon dioxide (SiO2), Thermal Conductivity, thermal stability, Transient plane source (TPS) method, Transient plane source (TPS) technique
Abstract: Traditionally, white LED's are made by mixing phosphor with an epoxy resin. But, the phosphor is not always evenly distributed, and the epoxy resin has a low thermal conductivity resulting in accelerated thermal aging during operation. This article studies the effects of implementing a ceramic phosphor plate with varying concentrations of magnesium oxide, and silicon dioxide. Thermal conductivity was calculated with the Hot Disk TPS 2500 S. It was found that as the magnesium oxide concentration increased so did the thermal conductivity of the plate. This is because magnesium oxide decreases the porosity of the plate allowing energy to more readily transport through it.
Reference: Journal of Materials Chemistry C (2015)