Sm3+掺杂对CaMoO4:Eu3+红色荧光粉结构和发光性质的影响

采用共沉淀法制备了CaMoO4:Eu3,Sm3+纳米荧光粉材料.系统研究了Sm3+离子的引入对CaMoO4:Eu3+材料的结构和发光性质的影响.结果表明:纳米材料的尺寸随着Sm3+离子掺杂浓度的增加而变小.Sm3+的引入,可实现Sm3+和Eu3+之间的能量传递,使Eu3+在近紫外405 nm处的激发增强,进而使Eu3+...

Effect of Sm~(3+) Doping on Structural and Luminescent Properties of CaMoO_4:Eu~(3+) Red Phosphors

Rare earth ion doped phosphors have attracted great interest during the past several decades due to their unique physical and chemical properties. Among these rare earth ions, the Eu³⁺ ion can emit red fluorescence centered at around 613 nm, corresponding to the ⁵D₀→⁷F₂ transition. Thus many Eu³⁺-doped materials can be used as red phosphors for white LEDs. In this paper, the Eu³⁺ and Sm³⁺ co-doped CaMoO₄ red phosphors were synthesized using a coprecipitation method. The effect of Sm³⁺ doping on structural and luminescent properties of CaMoO₄ ∶ Eu³⁺ red phosphors were studied. The results indicate that the particle size of the samples decrease with Sm³⁺ doping concentration. The excitation intensity at around 405 nm and emission intensity at around 613 nm of Eu³⁺ increased after the introduction of Sm³⁺ ions. When the mole fraction of Sm³⁺ is 5%, the emission intensity of red light is the strongest. In addition, the chromaticity coordinates for CaMoO₄ ∶ 0.1Eu³⁺ and CaMoO₄ ∶ 0.1Eu³⁺, 0.05Sm³⁺ phosphors are (0.661,0.329) and (0.667,0.328), respectively. The chromaticity coordinates of CaMoO₄ ∶ 0.1Eu³⁺, 0.05Sm³⁺ phosphors is closer to the Commission International del Eclairage (CIE) chromaticity coordinates(0.67,0.33). In conclusion, the Eu³⁺ and Sm³⁺ co-doped CaMoO₄ is a high performance red phosphor and has a potential application in white light emitting diodes.