Energy transfer and tunable-color luminescence properties of a single-phase CaSrNb2O7:Sm3+, Bi3+
New tunable-color luminescent materials are getting a lot of attention. Double-doped activated ions are an important research method. Here, CaSrNb 2 O 7 :R 3+ (R 3+ = Sm 3+ , Bi 3+ , and Sm 3+ /Bi 3+ ) are synthesized by solid state method in the air. Phase purity and successful synthesis of samples are confirmed by X-ray diffractometer (XRD) patterns and energy disperse spectroscopy (EDS) diagram. The luminescence properties of samples are studied. CaSrNb 2 O 7 :Sm 3+ has an excitation spectrum due to the O 2- - Sm 3+ charge transfer band (CTB) and the 6 H 5/2 → 4 H 9/2 , 4 D 3/2 , 4 D 1/2 , 4 F 7/2 , and 4 I 11/2 transitions of Sm 3+ ion. The red-orange emission of CaSrNb 2 O 7 :Sm 3+ is observed because of the 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 transitions of Sm 3+ ion. PLE spectrum of CaSrNb 2 O 7 :Bi 3+ comes from the metal-to-metal charge- transfer (MMCT) Bi 3+ - Nb 5+ and the 1 S 0 → 1 P 1 and 3 P 1 transitions of Bi 3+ ion. CaSrNb 2 O 7 :Bi 3+ shows blue emission due to the 3 P 1 → 1 S 0 transition of Bi 3+ ion. The excitation spectrum of CaSrNb 2 O 7 :Sm 3+ , Bi 3+ contains that of CaSrNb 2 O 7 :Bi 3+ and CaSrNb 2 O 7 :Sm 3+ . CaSrNb 2 O 7 :Sm 3+ , Bi 3+ with excitation at 314, 363, and 406 nm glows orange and red-orange, and red emission, respectively. We observe the energy transfer from Bi 3+ to Sm 3+ ions and the effect of Bi 3+ on luminescence properties of Sm 3+ ion by their spectra. The optimal Sm 3+ and Bi 3+ concentrations are confirmed by the concentration dependent spectra. The energy level diagrams of Sm 3+ and Bi 3+ are used to analyze the luminous mechanism. The results are conducive to the development of new Sm 3+ and Bi 3+ co-doped luminescent materials.
危险品化学品经营许可证（带存储）