Luminescence properties, energy transfer and thermal stability of white emitting phosphor Sr(PO):Ce/Tb/Mn for white LEDs.

A series of Sr(PO):Ce/Mn/Tb phosphors were synthesized by a high temperature solid phase method. After introducing Ce as sensitizer in Sr(PO):Ce/Mn, the efficient energy transfer from Ce to Mn was observed and analyzed in detail, and Sr(PO):Ce/Mn was demonstrated to be color tunable, changing from blue to orange red. In addition, Tb ion, which mainly emits green light, was further added into the Sr(PO):Ce/Mn. Due to the addition of this green emission, the white emitting phosphors with good quality were obtained. At the same time, the energy transfer mechanisms among Ce, Tb and Mn ions were also analyzed in detail. The results show that Sr(PO):Ce/Mn/Tb is a promising candidate for white light emitting diodes.