SUN Xiao-yuan, ZHANG Jia-hua, ZHANG Xia, LIU Shen-xin, JIANG Da-peng, WANG Xiao-jun. A Single White Phosphor Suitable for Near Ultraviolet Excitation Applied to New Generation White LED Lighting[J]. Chinese Journal of Luminescence, 2005,26(3): 404-406
SUN Xiao-yuan, ZHANG Jia-hua, ZHANG Xia, LIU Shen-xin, JIANG Da-peng, WANG Xiao-jun. A Single White Phosphor Suitable for Near Ultraviolet Excitation Applied to New Generation White LED Lighting[J]. Chinese Journal of Luminescence, 2005,26(3): 404-406DOI:
material. The emission spectrum consists of two bands
located at 470 and 570 nm
respectively. The two bands have different fluorescence lifetimes
being attributed to Eu
2+
ions substituted by different Sr sites. White light is generated by mixing the two colors. The excitation spectra of the two bands are both distributed within UV range. A white LED has been fabricated employing the white phosphor and a near UV of 400 nm InGaN chip. As the forward-bias current is 20 mA
the color temperature is 5664 K
the color coordinates(CIE) are
x
=0.33
y
=0.34
the color rendering index(CRI) is 85% and the luminescent intensity is 8100 cd/m
2
. Experiments demonstrate that CIE and CRI of the white LED change slightly with the variation of forward-bias current
indicating that the phosphor presented in this work is a promising material for use in new generation white LED lighting.