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:
A Single White Phosphor Suitable for Near Ultraviolet Excitation Applied to New Generation White LED Lighting
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.