Ca_6Sr_4(Si_2O_7)_3Cl_2:Dy^(3+)荧光粉的制备及其荧光性能（英文）

Synthesis and Luminescence Properties of Ca_6Sr_4(Si_2O_7)_3Cl_2:Dy^(3+) Phosphors for White Light-Emitting Diodes

采用高温固相法合成了系列单相全色Ca6Sr4(Si2O7)3Cl2:Dy3+荧光粉。通过X射线粉末衍射、荧光光谱等对合成的荧光粉样品进行了表征,并系统地研究了烧结温度、Dy3+离子掺杂量以及添加不同电荷补偿剂(Li+、Na+、K+)对样品发光强度的影响。结果表明:该荧光粉能被350 nm的近紫外光有效激发;当烧结温度为950℃、Dy3+的掺杂量为4%(摩尔分数),Na+作为电荷补偿剂时,样品的荧光强度最强。

The single phase full color phosphors of Dy3+-doped Ca6Sr4(Si2O7)3Cl2 were synthesized by a solid-state reaction method. The as-synthesized phosphors were characterized by X-ray diffraction and photoluminescence spectroscopy. These phosphors can be efficiently excited in a near ultraviolet light of 350 nm. The influences of sintering temperature, doping content and charge compensators(Li+, Na+ or K+) on the emission intensity were investigated. The results show that the most intensive emission intensity of the Ca6Sr4(Si2O7)3Cl2:Dy3+ phosphor, which is prepared with Na+ ions at the sintering temperature of 950 ℃ and the Dy3+doping content of 4.0 % mole fraction, can be obtained. It is indicated that Ca6Sr4(Si2O7)3Cl2:Dy3+ can be used as a promising luminescent material for near ultraviolet(NUV)-based white-emitting diodes.