The effects of the reflectivity of reflector on the light extraction efficiency of LED were discussed. Aiming at the blue and yellow light band, distributed Bragg reflectors (DBR) with high reflectivity were designed and optimized with TFcalc simulation software based on collaborative design of the LED chips and packaging. Simulation results show the maximal reflection bandwidth of double-DBR stacks can reach up to 216nm, which is 82nm higher than that of a single-DBR stack. The red shift of reference wavelength can be used to alleviate the blue shift of DBR reflection line arising with the increase of incident angle. The metal-enhanced DBR structure can reduce the reflection polarization effect, increase reflection bandwidth and average reflectivity, and also decrease the DBR thickness, thus optimizing the heat dissipation performance of LED chips.
