Abstract
Eu 2+ and Mn 2+ co-doped Ca 8Zn(SiO 4) 4Cl 2 phosphors have been synthesized by a high temperature solid state reaction. Energy transfer from Eu 2+ to Mn 2+ is observed. The emission spectra of the phosphors show a green band at 505 nm of Eu 2+ and a yellow band at 550 nm of Mn 2+. The excitation spectra corresponding to 4f 7-4f 65d transition of Eu 2+ cover the spectral range of 370–470 nm, well matching UV and/or blue LEDs. The shortening of fluorescent lifetimes of Eu 2+ followed by simultaneous increase of fluorescent intensity of Mn 2+ with increasing Mn 2+ concentrations is studied based on energy transfer. Upon blue light excitation the present phosphor can emit intense green/yellow in comparison with other chlorosilicate phosphors such as Eu 2+ and Mn 2+ co-doped Ca 8Mg(SiO 4) 4Cl 2 and Ca 3SiO 4Cl 2, demonstrating a potential application in phosphor converted white LEDs.
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