A new method of robust phosphor glass fabrication and performances for LEDs

Abstract

In this paper, a simple and practical method for preparing phosphor glass is proposed. Phosphor distribution and element analysis are investigated by optical microscope and FE-SEM. The phosphor particles dispersed in matrix is vividly observed and their distributions are uniform. Spectrum distribution and color coordinates depended on thickness of screen printed phosphor layer coupled with blue LED chip are studied. TG analysis shows phosphor glass shows excellent thermal stability in comparison to phosphor silicon. This study opens up many possibilities for applications using the phosphor glass on a selected chip which emission is well absorbed by all phosphors. The screen printing technique also offers possibilities for the design and engineering of complex phosphor layers on glass substrates. Phosphor screen printing technology allows the realization of high stability and thermal conductivity for phosphor layer. And this simple phosphor glass method provides many possibilities for LED packing, including TFFC (thin film flip chip) and remote phosphor technology.