Thermal Simulation for High Power LED Systems with Remote Phosphor Layer

Abstract

A lot of high power LED products adopt remote phosphor instead of conformal phosphor, since remote phosphor design can increase the light output and decrease the manufacture cost. However, whether the new design will affect the thermal performance is still not very clear. Thus, this paper is focus on the thermal performance of high power LED systems. The numerical models are built based on the real products and the parametric studies are also implemented. From the simulation results, it is found that the average temperature on remote phosphor layer is 10% lower than on conformal phosphor layer. This is helpful for the LED systems’ life since phosphor aging is slower under lower working temperature. The parametric studies show that the heat sink area doubles brings the temperature 10% off for total system.