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Luminescent property and application research of red molybdate phosphors for W-LEDs

机译:W-LED用红色钼酸磷光粉的发光特性及应用研究

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Gd~(2)(MoO~(4))~(3):10%Eu_(3+)and AgGdMo~(2)O~(8):10%Eu_(3+)phosphors were synthesized by a liquid deposition method and characterized by X-ray diffraction, scanning electron microscopy, diffuse reflectance and fluorescent spectrophotometry. Gd~(2)(MoO~(4))~(3)phosphor is of orthorhombic structure and AgGdMo~(2)O~(8)phosphor is of tetragonal structure. Both of the phosphors have high absorption and excitation efficiency in near ultraviolet area, which emit mainly at about 615 nm with narrow bands. Comparing with Gd~(2)(MoO~(4))~(3):10%Eu_(3+), AgGdMo~(2)O~(8):10%Eu_(3+)red phosphor has small size and uniform distribution. Therefore, under 395 nm excitation, the emission intensity of AgGdMo~(2)O~(8):10%Eu_(3+)around 615 nm is twice as much as that of Gd~(2)(MoO~(4))~(3):Eu_(3+). Moreover, the color purity and luminous efficiency of the phosphors converted LEDs based on AgGdMo~(2)O~(8):10%Eu_(3+)red phosphor and Ga(In)N chips, are also higher than that of Gd~(2)(MoO~(4))~(3):Eu_(3+). The results demonstrated that AgGdMo~(2)O~(8):Eu_(3+)is more suitable to be a red phosphor applying for white LEDs.
机译:通过液相沉积法合成了Gd〜(2)(MoO〜(4))〜(3):10%Eu_(3+)和AgGdMo〜(2)O〜(8):10%Eu_(3+)磷该方法的特征在于X射线衍射,扫描电子显微镜,漫反射和荧光分光光度法。 Gd〜(2)(MoO〜(4))〜(3)磷具有正交晶结构,AgGdMo〜(2)O〜(8)磷具有四方结构。两种荧光粉在近紫外区域均具有高吸收和激发效率,主要在约615 nm的窄带处发射。与Gd〜(2)(MoO〜(4))〜(3):10%Eu_(3+)相比,AgGdMo〜(2)O〜(8):10%Eu_(3+)红色荧光粉体积小且分布均匀。因此,在395nm激发下,AgGdMo〜(2)O〜(8):10%Eu_(3+)在615nm附近的发射强度是Gd〜(2)(MoO〜(4)的两倍。 )〜(3):Eu_(3+)。此外,基于AgGdMo〜(2)O〜(8):10%Eu_(3+)红色荧光粉和Ga(In)N芯片的荧光粉转换LED的色纯度和发光效率也高于Gd。 〜(2)(MoO〜(4))〜(3):Eu_(3+)。结果表明,AgGdMo〜(2)O〜(8):Eu_(3+)更适合用作白色LED的红色荧光粉。

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