不同合成方法对LiMgPO_(4)∶Dy发光性能的影响  

Effect of Different Synthesis Methods on the Luminescence Properties of LiMgPO_(4)∶Dy

作　　者：尹子龙 冯光文[1] 陈恒雷[1] YIN Zilong;FENG Guangwen;CHEN Henglei(School of Physics and Technology,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学物理科学与技术学院,乌鲁木齐830046

出　　处：《人工晶体学报》2023年第2期315-321,共7页Journal of Synthetic Crystals

基　　金：新疆维吾尔自治区自然科学基金(2022D01C51)。

摘　　要：分别采用高温固相法和溶胶凝胶法合成了LiMgPO_(4)和LiMgPO_(4)∶Dy,通过热重-差热热分析仪、X射线衍射仪、傅里叶红外光谱仪、场发射高倍扫描电镜、紫外可见分光光度计和荧光分光光度计研究了不同合成方法对LiMgPO_(4)∶Dy晶体结构、形貌和发光性能的影响。结果表明,溶胶凝胶法的最低合成温度为750℃且晶体中几乎不存在其他晶相,而高温固相法在950℃合成的晶体中仍然存在少量Mg_(3)(PO_(4))_(2)晶相;相比于高温固相法,溶胶凝胶法合成的样品形貌比较规则;两种方法合成的样品在可见光区域光吸收能力差,而在紫外区域高温固相法合成的样品光吸收能力明显较高;高温固相法合成的LiMgPO_(4)∶Dy光学带隙范围为3.76~3.93 eV,溶胶凝胶法合成的LiMgPO_(4)∶Dy光学带隙范围为3.85~3.94 eV,合成方法对样品的光学带隙影响较小。LiMgPO_(4)∶Dy的最佳激发波长为350 nm,最强发射峰位于579 nm处,相比于高温固相法,溶胶凝胶法合成样品的发光强度更好。LiMgPO_(4)and LiMgPO_(4)∶Dy were synthesized by high-temperature solid-state method and sol-gel method. The effects of different synthesis methods on crystal structure, morphology and luminescence properties of LiMgPO_(4)∶Dy were studied using thermogravimetry-differential thermal analyzor, X-ray diffractometer, Fourier transform infrared spectrometer, scanning electron microscope, ultraviolet-visible spectrophotometer and fluorospectro-photometer. The results show that the lowest synthesis temperature by sol-gel method is 750 ℃ and no other crystal phases are found in the crystal, while a small amount of Mg_(3)(PO_(4))_(2)crystal phases are found in the sample synthesized by high-temperature solid-state method at 950 ℃. The morphology of the samples synthesized by sol-gel method is better than that synthesized by high-temperature solid-state method. Samples synthesized by both methods show low absorbance in the visible region. In the ultraviolet region, the absorbance of the sample synthesized by high-temperature solid-state method is higher than that synthesized by sol-gel method. The optical band gap range of LiMgPO_(4)∶Dy synthesized by high-temperature solid-state method is 3.76~3.93 eV, and that of LiMgPO_(4)∶Dy synthesized by sol-gel method is 3.85~3.94 eV. The synthesis method has little effect on the optical band gap of the sample. The optimal excitation wavelength of LiMgPO_(4)∶Dy is 350 nm, and the strongest emission wavelength is 579 nm. The luminescence intensity of the samples synthesized by sol-gel method is better than that synthesized by high-temperature solid-state method.

关 键 词：LiMgPO_(4)∶Dy 溶胶凝胶法 高温固相法 晶体结构 光学带隙 发光性能 

分 类 号：O734[理学—晶体学]