Eu doped CaAlSiN3 phosphor was successfully prepared by high-temperature solid phase method using Ca2Si5N8:Eu as major raw materials. The phase transition and luminescence properties were studied in detail. It is found that the phase changes from Ca2Si5N8 to CaSiN2 when the temperature reaches 800 ℃. Then CaAlSiN3:Eu phosphor was synthesized by the solid phase reaction: (Ca,Eu)SiN2+AlN→(Ca,Eu)AlSiN3 when the reaches 1500 ℃. The morphology and luminescence properties of CaAlSiN3: Eu with different Eu concentration was also studied.
Eu doped Sr2Si5N8 red phosphors with different Eu concentration were synthesized by high-temperature solid phase method. The crystal structure, luminescence and the thermal quenching properties were investigated in detail. It was found that the thermal quenching property was largely dependent on the Eu concentration. Interestingly, the thermal quenching property for low concentration Eu doped Sr2Si5N8 was greatly improved as increasing Eu concentration. In order to understand the relevant mechanism, we examined the change of relative intensity and fluorescence lifetime for the two-peak emission in Sr2Si5N8: Eu. The result revealed that Eu distribution changed with increasing Eu concentration, which should be the mainly mechanism of the thermal quenching behavior for low concentration Eu doped Sr2Si5N8 phosphors.
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