Luminescence characteristics of the single host white emitting Ca_(10)(Si_2O_7)_3Cl_2:Eu~(2+),Mn~(2+) phosphor for white LED

The single host white emitting Ca10(Si2O7)3Cl2:Eu2+,Mn2+ phosphor was synthesized by high temperature solid state reaction method, and the luminescence characteristics were investigated. The results show that Ca10(Si2O7)3Cl2:Eu2+,Mn2+ phosphor exhibits three emission at 426, 523 and 585 nm. The 426 and 523 nm emission originates from the transition 5d→4f of Eu2+ that occupies the two Ca2+ sites in Ca10(Si2O7)3Cl2, while the 585 nm emission is attributed to the energy transfer from Eu2+ to Mn2+. The white light can be obtained by mixing the three emission of blue (426 nm), green (523 nm) and red (585 nm) in the single host. According to the Dexter’ energy transfer formula of multipolar interaction, the energy transfer between Eu2+ and Mn2+ is due to the electric dipole-dipole interaction of the resonance transfer. The relative emission spectrum of the InGaN-based Ca10(Si2O7)3Cl2:Eu2+,Mn2+ LED was investigated, and the CIE chromaticity is (x=0.323, y=0.327). Therefore, Ca10(Si2O7)3Cl2:Eu2+,Mn2+ phosphor is a promising single host white emission phosphor for white LED.