Thermal Diffusivity of Light-emitting MaterialDetermination by Photoacoustic Piezoelectric Technique

摘要

The theory of Photoacoustic Piezoelectric (PAPE) technique has been developed for two-layered model.An analytical expression for the phase of output voltage versus modulation frequency has beenobtained. The thermal diffusivity of Phosphor/PVA light-emitting composite material has been studied.PAPE technique has been employed successfully for investigating the thermal diffusivity oftwo-layered materials.