YVO4微米球的水热合成与光学性能研究  

Hydrothermal Synthesis and Optical Properties of YVO4 Microspheres

作　　者：王学军 龚帅 李华千 杨流赛 曾常根 WANG Xuejun;GONG Shuai;LI Huaqian;YANG Liusai;ZENG Changgen(School of Chemistry and Environmental Science,Shangrao Normal University,Shangrao Jiangxi 334001,China;Enjiang School of Yongfeng,Ji'an Jiangxi 331500,China)

机构地区：[1]上饶师范学院化学与环境科学学院,江西上饶334001 [2]永丰县恩江中学,江西吉安331500

出　　处：《上饶师范学院学报》2020年第6期40-45,共6页Journal of Shangrao Normal University

基　　金：上饶师范学院大学生学术科技研究项目(XS201825);上饶师范学院校级大学生创新训练项目(2017-CX-26);江西省教育厅科学技术研究项目(GJJ180882)。

摘　　要：采用水热法制备了YVO4组装微米球,并考察烧结温度对YVO4微米球结构、形貌和发光性能的影响。通过X射线粉末衍射(XRD)和扫描电子显微镜(SEM)测试表明,所得样品均保持四方锆石结构的纯相YVO4,但是随着烧结温度的升高,YVO4微米球形貌表面逐渐变得粗糙。在313 nm激发下,能量可以很快在YVO4基质晶格中传递,并在400到650 nm之间有一个宽的发射峰,其峰值对应486 nm,该宽峰发射属于VO43-基团的本征电子跃迁发射;同时,由于原料六水合硝酸钇的质量分数为99.95%,含有微量的稀土Eu3+离子,从而导致荧光发射谱图中出现了微弱的Eu3+离子特征发射峰;将水热样品在400℃烧结处理后,VO43-基团的本征电子跃迁发射显著增强,而且明显地大于Eu3+离子特征发射峰强度;此外,随着烧结温度的升高,VO43-基团的宽峰发射强度逐渐下降,而Eu3+的发射峰强度逐渐增强,说明YVO4微米球结晶性的提高,有利于VO43-基团通过晶格间的振动将能量传递给Eu3+,增强了Eu3+的发射。Assembled YVO4 microspheres were prepared by means of hydrothermal method,and the influence of sintering temperature on the structure,morphology and luminescence properties of YVO4 microspheres was investigated.The results of X-ray powder diffraction(XRD)and scanning electron microscope(SEM)show that the samples keep the pure phase YVO4 of tetragonal zircon structure,but the surface of YVO4 microspheres become rough gradually with the increase of sintering temperature.Under the excitation of 313 nm,the emission spectra of YVO4 microspheres exhibited a broad emission band around 400~650 nm located at 486 nm,corresponding to the intrinsic emission of VO43-groups.Moreover,the weak characteristic emission of Eu3+also appeared due to trace amounts of rare earth Eu3+ions,which come from the purity 99.95%of the raw material yttrium nitrate hexahydrate.After the hydrothermal sample is sintered at 400℃,the intrinsic emission of the VO43-groups is significantly enhanced,and it is significantly greater than the characteristic emission intensity of Eu3+ions.Moreover,with the increase of sintering temperature,the broad emission intensity of VO43-groups decreases gradually,while the emission intensity of Eu3+increases gradually.Therefore,the increased crystallinity and the decreased surface adsorbates of YVO4 microspheres are conducive to VO43-groups transmitting energy to Eu3+through inter-lattice vibration,which enhances the fluorescence emission of Eu3+.

关 键 词：YVO4 水热法 微米球 荧光性能 

分 类 号：TB34[一般工业技术—材料科学与工程]