新型红色荧光粉NaY(MoO_4)_2:Sm^(3+)的制备及发光性能的研究

Synthesis and luminescence properties of a novel red NaY(MoO_4)_2:Sm^(3+) phosphor

采用高温固相法制备了NaY(MoO4)2:Sm3+新型红色荧光粉,研究了Sm3+在NaY(MoO4)2基质中的发光特性。X射线衍射(XRD)测量结果表明,烧结温度为550℃时,制备的样品为纯相NaY(MoO4)2晶体。样品激发谱由两部分组成:220～340nm为电荷迁移带,峰值位于297nm;350～500nm的一系列线状峰为Sm3+的特征激发峰,最强峰位于403nm(6 H5/2→4 F7/2)。样品可被UV-LED管芯及蓝光激发。发射谱由564nm(4 G5/2→6 H5/2),600nm和607nm(4 G5/2→6 H7/2)、647nm(4 G5/2→6 H9/2)和708nm(4 G5/2→6 H11/2)4个峰组成,最强发射峰位于647nm(4 G5/2→6 H9/2),呈现红光发射。研究了不同Sm3+掺杂浓度对NaY1-X(MoO4)2:xSm3+材料发光强度的影响,X=0.05时出现浓度猝灭,分析表明,其猝灭机理是电偶极-电偶极的相互作用。

NaY（MoO4 ）2：Sm^3＋ phosphor was synthesized by solid state reaction and its luminescent properties were studied. X-ray diffraction （XRD） results show that 550 ℃ is a suitable sintered temperature for preparation of NaY （MOO4）2.. Sm^3＋ phosphors. Its excitation spectrum has several sharp peaks. The peak centered at 297 nm can be attributed to the O-Sin charge transfer transition. The stron- gest peak appears at 403 um （6 H5/2→4F7/2 ）. The sample can be excited by UV-LED and blue light. The emission spectrum of the phosphor is composed of four major emission peaks centered at 564 nm （4Gs/2→6Hs/2）, 600 nm and 607 um （4G5/2 →6H7/2 ）, 647 nm （4G5/2→6H9/2 ）, 708 nm （4G5/2→6 H11/2 ）. The strongest peak appears at 647 nm （4G5/2→~6 H9/2 ）. The effects of the Sm3＋ concemra tion on the emission intensity are also investigated and the concentration quenching happers when the concentration of Sm3＋ is 0.05. According to the Dexter theory,the concentration quenching mechanism is from the d-d interaction.