The Impact of Distance Between Two Phosphor Layers on Luminous Flux and Color Quality of Remote Phosphor Package

Abstract

In this paper, we propose and present a method to enhance luminous efficiency, color rendering property and color scale quality of the multi-chip white LED lamps (MCW-LEDs). This can be done by changing the distance between two phosphor layers in remote phosphor layer with a dual-layer structure. Index, with the appropriate distance between two phosphor layers could offer a great increase on the optical performance of MCW-LEDs. Simulation results demonstrated that the luminous efficiency, the color rendering property, the color scale quality of MCW-LEDs significantly improve with distance from 0 to 0.1, mm, meanwhile the optical performance slightly decreases with the distance from 0.1 to 0.7, mm. To obtain the highest lumen output efficiency and the best color rendering index, the distance around 0.1, mm should be suggested.