Journal
OPTICS LETTERS
Volume 38, Issue 13, Pages 2240-2243Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.002240
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Funding
- Nature Science Foundation of Hubei province Key Project [2011CHB009]
- Wuhan Key Science Technology Project [201111711563]
- GuangDong Real Faith Optoelectronics Inc.
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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 mu m 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. (C) 2013 Optical Society of America
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