Li+,Eu3+共掺杂La2MoO6红色荧光粉的Pechini法合成及近紫外/蓝光激发下的发光特征

采用Pechini法合成了白光LED用红色荧光粉La_1.9-xMoO₆:0.10Eu³⁺,xLi⁺(x=0,0.10,0.20,0.25),并对样品分别进行了X射线衍射(XRD)、扫描电子显微镜(SEM)、电子能谱(EDX)以及荧光光谱(PL)等技术手段分析。 PL光谱显示该荧光粉可被近紫外光(395 nm)和蓝光(466 nm)有效激发,产生616和623 nm强的红光发射,归属于Eu³⁺的⁵D₀→⁷F₂电偶极跃迁。该荧光粉与近紫外LED芯片(370~410 nm)和蓝光LED芯片(450~470 nm)均匹配良好,具有潜在的商业应用价值。 共掺Li⁺离子作为敏化剂能显著提高荧光粉的发光强度,且最优掺杂量为x=0.20。

Synthesis of Li+ and Eu3+ Co-doped La2MoO6 Red Phosphors by Pechini Methods and Its Photoluminescence Properties Under Near-Ultraviolet and Blue Light

A series of Li⁺ and Eu³⁺ co-doped red phosphors La_1.9-xMoO₆:0.10Eu³⁺,xLi⁺(x=0,0.10,0.20,0.25) has been successfully synthesized via Pechiini method. And the samples were investigated by the X-ray diffraction(XRD), scanning electron microscope(SEM), energy dispersive spectrometer(EDS) and photoluminescence(PL) measurements. The PL results reveal that the samples can be excited efficiently by near-ultraviolet(near-UV)(395 nm) and blue light(466 nm), and exhibit strong red emission peaks at 616 nm and 623 nm, due to the ⁵D₀→⁷F₂ electric dipole transition of Eu³⁺. These phosphors exhibit potential commercial value since they match well with white light emitting diode(W-LED) near-UV chip(370~410 nm) and blue light chip(450~470 nm). Addition of Li⁺ acting as a sensitizer strongly enhances the emission intensity of the phosphors, and the optimum concentration is x=0.20.