Preparation of a YAG:Ce phosphor glass by screen-printing technology and its application in LED packaging

• Published in: Optics letters 2013-07, Vol.38 (13), p.2240-2243
• Main Authors: Yang, Liang, Chen, Mingxiang, Lv, Zhicheng, Wang, Simin, Liu, Xiaogang, Liu, Sheng
• Format: Article
• Language: English
• Subjects: Chips; Color; Design engineering; Glass; Light-emitting diodes; Luminous efficacy; Phosphors; Scanning electron microscopy
• ISSN: 0146-9592; 1539-4794
• DOI: 10.1364/OL.38.002240

A simple and practical method for preparing phosphor glass is proposed. Phosphor distribution and element analysis are investigated by optical microscope and field emission scanning electron microscope (FE-SEM). The phosphor particles dispersed in the matrix are vividly observed, and their distributions are uniform. Spectrum distribution and color coordinates dependent on the thickness of the screen-printed phosphor layer coupled with a blue light emitting diode (LED) chip are studied. The luminous efficacy of the 75 μm printed phosphor-layer phosphor glass packaged white LED is 81.24 lm/W at 350 mA. This study opens up many possibilities for applications using the phosphor glass on a selected chip in 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 the phosphor layer. This phosphor glass method provides many possibilities for LED packing, including thin-film flip chip and remote phosphor technology.