Thermal analysis of phosphor in high brightness LED

The drive to increased electrical currents input to achieve high lumen for Light Emitting Diode (LED) hasled to a series of thermal problems. Hence, thermal management for solid-state lighting (SSL) is a key design parameter as the temperature will directly affect the maximum light output, quality, reliability of the solid state lighting and the life time. Two of the major heat sources in LED package has been identify to be die and phosphor. Many thermal researches clear show the thermal behavior in LED package. But the phosphor efficiency in LED and its performance is still under discussion because it is more complex to separate the original light and converted light in LED. In this work,a group of experiment is executed to check the thermal effect of phosphors in LED and to distinguish the light from LED die or from phosphor. In addition, a numerical simulation is achieved with the efficiency of LED die and phosphor according to thermal analysis.