蓝色荧光粉Sr3LnM(PO4)3F:Eu2+的发光调控

采用高温固相法合成了一系列Eu²⁺激活的Sr₃LnM(PO₄)₃F(Ln=Gd, La, Y; M= Na, K)荧光粉,并通过X射线衍射、扫描电子显微镜、荧光光谱等对样品的物相结构、形貌和发光特性进行了表征及分析。结果表明:成功合成了Sr₃LnM(PO₄)₃F:Eu²⁺荧光粉,样品的粒径为2~10 μm。荧光粉在蓝光区具有强烈的发射,归属为发光中心Eu²⁺的4f⁶5d→4f⁷跃迁。当基质中的碱金属M由Na变成K时,Eu²⁺的发光颜色由淡蓝色变成深蓝色,色纯度大幅提高,有效地调控了Eu²⁺在氟磷灰石Sr₃LnM(PO₄)₃F中的发光,进而发现了一种通过改变第二层配位原子来调控Eu²⁺发光的策略。

Luminescence Regulation of Blue Phosphor Sr3LnM(PO4)3F:Eu2+

A series of Eu²⁺ -activated Sr₃LnM(PO₄)₃F(Ln=Gd, La, Y; M=Na, K) phosphors were synthesized by high-temperature solid-phase method. The phase structure, morphology and luminescence characteristics of the samples were characterized by X-ray diffraction, scanning electron microscopy, fluorescence spectroscopy and other test methods. The experimental results demonstrate that the phosphor Sr₃LnM(PO₄)₃F:Eu²⁺ was successfully synthesized, and the particle size of the sample ranges from 2 μm to 10 μm. The phosphor has strong emission in the blue-light region, which is attributed to the 4f⁶5d→4f⁷ transition of the luminescent center Eu²⁺. The emitting color of Eu²⁺ changes from light blue to dark blue and the color purity increases after the transformation of Na to K, which effectively regulates the luminescence of Eu²⁺ in fluorapatite Sr₃LnM(PO₄)₃F. A new strategy by substituting of the secondary layer coordination atom is found to regulate the phosphors color of Eu²⁺.