Optical simulation analysis of high power LED package structure

Abstract

The single LED package structure determines the light intensity distribution and the well-designed package structure will be conductive to light emitting and improve its external quantum efficiency. This paper based on the optical package structure of high power LED, in order to analyze the influence of the structure of LED package on optical performance and the feasibility of the packaging structure design, the simplified high power LED optical models were established in Tracepro software. The light distribution curve of LED was obtained and the difference between measured data and simulation result was compared. By changing the LED optical model parameters in the experiment, such as: the shape of reflector, lens design and the position of phosphors to get the light distribution curves under different parameters of package structure and then we analyze the effect of various packaging structures on optical performance to find the package structure optimization, so that it could be used in actual production getting a higher available luminous flux and the light extraction. What's more, designing a package structure which can be achieving the specific light intensity distribution meets the requirements of the LED light source in different areas.