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采用溶胶凝胶法合成Ca Y１－x Al O４:x Eu３＋ 荧光粉,对样品进行 X 射线光电子能谱(XPS)、X 射线粉末衍射(XRD)、透射电镜(TEM)以及荧光光谱(PL)等表征,探讨反应的合成温度、时间及铕离子的掺杂浓度对样品发光性能的影响.结果表明,在９００~１０００℃时,晶体初步形成,在１１００~１３５０℃时,可生成很纯的四方晶体结构.在温度１２００℃和铕离子的掺杂量x＝０．０１时,样品在反应时间为６h时发光强度最强.在λex＝２７３nm 光激发下,发射光谱位于５８９nm、６２３nm 和７０４nm 处的三个尖峰,分别归属于 Eu３＋ 离子的５D０→７F１、５D０→７F２和５D０→７F４能级跃迁,当铕离子的掺杂浓度x＝０．０２时(温度１２００ ℃及时间６h),样品发光强度最强,荧光体发射红光.铕离子浓度猝灭的作用机理为邻近离子间的相互作用,其荧光寿命为１．３２５ms.
X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectroscopy (PL) were used to synthesize Ca Y1-x Al O4: x Eu3 + phosphor by sol-gel method The effects of synthesis temperature, time and doping concentration of europium ion on the luminescence properties of the samples were investigated. The results show that the crystals form initially at 900-1000 ℃, Crystal structure.The luminescence intensity of the sample is the strongest when the reaction time is 6h at the temperature of 1200 ℃ and the doping amount of europium ion is 0.01.The emission spectra of the sample are at 589nm, 623nm and 704nm under the excitation of λex = 273nm Which are assigned to the 5D0 → 7F1, 5D0 → 7F2 and 5D0 → 7F4 transitions of Eu3 + ions respectively. When the doping concentration of europium ion is 0.02 (temperature is 1200 ℃ and time is 6h), the samples emit light The strongest and the phosphor emits red light.The quenching mechanism of the concentration of europium ions is the interaction between adjacent ions with a fluorescence lifetime of 1.325 ms.