【摘要】 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。更多还原

【Abstract】 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 from5D0to7F2transition 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.更多还原