Luminescence Properties and Thermal Stability of Sm3+,Eu3+Co-doped Double Perovskite Gd2 ZnTiO6 Phosphor
Red emitting phosphors with high thermal stability are of great significance for improving the performance of phosphor-converted WLEDs(pc-WLEDs).Introducing sensitizers to transfer energy to the luminescent center and improve the thermal stability of phosphor is an effective strategy for developing high-performance WLEDs.Here,a dou-ble perovskite structure compound Gd2ZnTiO6 is selected as the host to produce series of Sm3+,Eu3+activated red phos-phors,and the energy transfer process from Sm3+to Eu3+is discussed in detail.This work confirms the positive effect of energy transfer on the thermal stability of the single Eu3+-activated phosphor.The PL intensity of the co-dopping sam-ples at 150℃remains 74%of that at room temperature.This result provides a practical evidence for the theory that energy transfer from sensitizer to activators can effectively suppress the thermal quenching of phosphors.
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