College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China
Abstract A novel red-emitting phosphor, CaYAl3O7: Eu3+, 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 Eu3+ luminescence is detected in the Eu3+-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 Eu3+ emission are observed. A possible mechanism of the energy transfer between Sm3+ and Eu3+ is investigated in detail.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11204113, 61265004, and 51272097), the Foundation of Application Research of Yunnan Province, China (Grant No. 2011FB022), the Chinese Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20115314120001), the Postdoctoral Science Foundation of China (Grant No. 2011M501424), and the National Basic Research Program of China (Grant No. 2011CB211708).
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