Eu3+掺杂的含氧磷酸盐发光性质

采用固态反应法制备了Gd₃PO₇:Eu³⁺ 和 La₃PO₇:Eu³⁺发光材料,通过X射线衍射和SEM确定了样品的结构和形貌。 在真空紫外光的激发下,Gd₃PO₇:Eu³⁺样品展示了较弱的基质吸收;但在紫外光的激发下,Gd₃PO₇:Eu³⁺显示了比La₃PO₇:Eu³⁺更强的红光发射,其原因是在Gd₃PO₇:Eu³⁺中存在Gd³⁺到Eu³⁺的有效能量传递过程。两个样品的发射光谱峰值位于618 nm,属于Eu³⁺的⁵D₀→⁷F₂跃迁。Eu³⁺在材料中处于较低的格位对称环境,具有很好的色纯度。

Luminescent Properties of Eu3+-doped Oxyphosphates

Gd₃PO₇:Eu³⁺ and La₃PO₇:Eu³⁺ samples were prepared by conventional solid-state reaction route. X-ray diffraction and scanning of electron microscopy were employed to characterize the samples. The excitation and emission spectra from VUV to visible wavelength were obtained at the room temperature. It is found that the host absorption band of Gd₃PO₇:Eu³⁺ is weaker under VUV excitation, but the red luminescence intensity of Gd₃PO₇:Eu³⁺ is stronger than La₃PO₇:Eu³⁺ under UV excitation. There is an efficient energy-transfer process from Gd³⁺ to Eu³⁺. The two samples major emission peaks from ⁵D₀ to ⁷F₂ transition of Eu³⁺ locate at 618 nm. The results of emission spectra indicate that the local symmetry of the Eu³⁺ ions is lower and the color purity is better in these oxyphosphates samples.