Phase conversion and spectral properties of long lasting phosphor Zn3 (PO4)2:Mn2+, Ga3+

A red long lasting phosphor Zn3(PO4)2: Mn2+,Ga3+ (ZPMG) was prepared by ceramic method, and phase conversion and spectral properties were investigated. Results indicated that the phase conversion from a-Zn3(PO4)2, b-Zn3(PO4)2 toc-Zn3(PO4)2 occurs with different manganese concentration incorporated and sinter process. The structural change induced by the phase transformation results in a remarkable difference in the spectral properties. The possible luminescence mechanism for this red LLP with different forms has been illustrated.