| Title |
Optimization of Phosphor Contents and Heat-treatment Temperature in White LED Package with Glass Remote Phosphor Structure |
| Authors |
Hee-Suk Jeong ; Seok-Gi Hong ; Jeongduk Ryeom |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.3.030 |
| Keywords |
Phosphor Contents ; Heat treatment Temperature ; Glass Remote Phosphor ; LED Package ; LED Lighting |
| Abstract |
In this research, a 6W white LED package with a Glass Remote Phosphor was developed to improve the life of an LED package. The Glass Remote Phosphor was fabricated by the Phosphor in Glass (PiG) method, wherein phosphor YAG:Ce was mixed with glass frit and then heat treated. A paste with 75wt.% of a phosphor substance and 25wt.% glass frit was coated on a glass substrate two times using the screen-printing technique and heat-treated at 800℃ ; this structure gave a luminous efficacy of 136.1lm/W, color rendering index of 74Ra, and color temperature of 5,342K, thus satisfying the requirements as a light source for lighting. Moreover, an IES LM-80 accelerated life test was conducted on the same LED package for 6,000h in order to estimate the L70 lifetime based on IES TM-21. The results showed guaranteed lifetimes of 213,000h at 55℃, 245,000h at 85℃, and 209,000h at 95℃. |