离子置换法制备的掺铽钨酸钙薄膜的结构、成分与性能研究

Structure,Composition and Properties of Calcium-doped Terbium Tungsten Film by Ion Exchange Method

采用离子置换法直接在室温条件下合成出了发光性能优良的CaWO4:Tb3+薄膜,并利用X射线衍射仪、X射线光电子能谱仪、荧光光谱仪等对薄膜的相结构、成分和元素价态及发光性能进行了分析。研究表明,采用离子置换法合成的CaWO4:Tb3+薄膜属于四方晶系;成分及元素价态分析表明,经过掺杂处理后,薄膜中含有Tb元素,并且掺入的Tb元素表现为+3价;当薄膜在含Tb3+离子的溶液中处理8 min后,膜中的Tb元素含量可达3%。在紫外光的激发下,CaWO4:Tb3+薄膜发射出波长为489 nm、543 nm、585 nm和618 nm的光,分别对应Tb3+离子5D4→7F6、7F5、7F4、7F3能级的跃迁,其中543 nm处的发光最强。由此可见,离子置换法成功地解决了无法利用电化学技术制备出稀土钨酸盐材料的难题。

CaWO4：Tb3＋ thin films with excellent luminescent properties were produced by ion-exchange method directly in the room temperature.This paper analyzed the film phase structure,composition and valence state and luminescent properties by X-ray diffraction,X-ray photoelectron spectroscopy,fluorescence spectroscopy.The results showed that the use of ion-exchange synthesis of CaWO4：Tb3＋ films are tetragonal.Further composition and valence analysis showed that the film containing Tb elements,and elements of performance for the incorporation of Tb3＋ after the doping process.When the film containing Tb3＋ ions in solution are treated after 8 mins,the membrane element content of Tb increased to 3 %.UV excitation,CaWO4：Tb3＋ thin film emits a wavelength of 489,543,585 and 618 nm light,corresponding to the Tb3＋ ion 5D4→ 7F6,7F5,7F4,7F3energy level transitions.The ion exchange method can not be successfully solved using electrochemical technology to prepare rare earth tungstates materials.