Analysis and Modeling of Optical and Thermal Properties of Phosphor Converted White Light Emitting Diode

Based on the energy flow inside phosphor materials, a prediction model and its modeling method for the thermal effect and optical properties of phosphor converted white light emitting diode (LED) are proposed in this paper. With the phosphor characteristics (excitation wavelength, phosphor temperature, thickness, light absorption and conversion coefficients), it is possible to accurately quantify the heat dissipation coefficient and optical power of the white LED device, and then to estimate the emission power and luminous flux. The modeling consists of a series of optical and thermal evaluation, which are simple for LED designers to comply. Using samples of LED sources and phosphor material, the proposed prediction model has been validated in experiments, where good agreements between calculations and practical measurements have been achieved.