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A novel red-emitting phosphor, CaYAl3O7 : Eu 3+ , Sm3+ , is synthesized by a combustion method at a low temperature (850℃), and the single phase of CaYAl3O7 is confirmed by powder X-ray diffraction measurements. The photoluminescence property results reveal that the red emission intensity of Eu3+ is strongly dependent on the Sm3+ concentration. Only the Eu 3+ luminescence is detected in the Eu 3+ -Sm3+ co-doped CaYAl3O7 phosphor with 393 nm excitation. However, under the characteristic excitation (402 nm) of Sm3+ , not only the Sm3+ emission but also the Eu 3+ emission are observed. A possible mechanism of the energy transfer between Sm3+ and Eu 3+ is investigated in detail.
A novel red-emitting phosphor, CaYAl3O7: Eu 3+, Sm3 +, is synthesized by a combustion method at a low temperature (850 ° C), and the single phase of CaYAl3O7 is confirmed by powder X-ray diffraction. reveal that the red emission intensity of Eu3 + is strongly dependent on the Sm3 + concentration. Only, Eu3 + luminescence is detected in the Eu3 + -Sm3 + co-doped CaYAl3O7 phosphor with 393 nm excitation. However, ) of Sm3 +, not only of Sm3 + emission but also of Eu3 + emission are observed. A possible mechanism of the energy transfer between Sm3 + and Eu3 + is investigated in detail.