Abstract: ZnS: Mn yellow phosphors doped with Cu for white light emitting diodes were synthesized by solid state reaction method. The optical properties and structures of ZnS: Mn, Cu phosphors were investigated by x-ray diffraction, photoluminescence, and scanning electro microscopy. Photoluminescence excitation spectra originated from Mn(2+) were ranged from 450 nm to 500 nm. The yellow emission at around 580 nm was associated with (4)T(1)→(6)A(1) transition of Mn(2+) ions in ZnS: Mn, Cu phosphors. The highest photoluminescence intensity of the phosphors under 405 nm excitation was obtained at Cu concentration of 0.02 mol%. The enhanced photoluminescent intensity in the ZnS: Mn, Cu phosphors was interpreted by energy transfer from Cu to Mn.
