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摘要
Ho3+/Yb3+/Tm3+ codoped 12CaO.7Al(2)O(3) (C12A7) polycrystals exhibiting upconversion white-light under 980 nm excitation have been successfully synthesized by high temperature solid-state reaction method. An orthogonal experiment is designed for finding out the effects of the rare earth ions concentrations on the intensity of white light. In order to realize the generating of white-light, the feasible solution is to increase the concentration of Ho3+ and decrease the Tm3+ concentration. CIE coordinate of C12A7:0.5 mol% Ho3+/4.0 mol% Yb3+/0.7 mol%Tm3+- sample at 980 nm excitation under 800 mW is (0.32, 0.34), which is very close to the white emission center (0.33, 0.33). As the pump powers increasing, the tendency of color coordinates is toward the blue region. The pump dependence suggests that the blue upconversion emissions are populated by a three-photon process, the green emissions are a two-photon process, the red emissions are a combination of two and three photons processes. Studies on the upconversion mechanism show that the blue and green emissions are attributed to Tm(3+:1)G(4).H-3(6) and Ho3+:5F4/S-5(2).I-5(8), respectively. The red emissions include two parts: Tm3+:1 G(4) .F-3(4) and Ho3+:5F5.I-5(8).
- 出版日期2014-2
- 单位哈尔滨工业大学
