高温固相法制备CaCO_3:Eu~(3+),Li~+红色荧光粉

以CaCO3、Eu2O3和Li2CO3为主要原料,采用高温固相法,首次制备CaCO3:Eu3+,Li+红色荧光粉。通过对前驱物进行同步差热分析(TG-SDTA),确定其煅烧温度;利用X射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)和拉曼光谱对样品的结构进行表征;采用荧光光度仪对样品的发光性能进行测试。结果表明:前驱物的煅烧温度为655℃时,样品主晶相为方解石型CaCO3,掺杂Eu3+和Li+离子分别作为发光中心和敏化剂进入到CaCO3的晶格中。荧光粉的最大激发峰位于272nm,属于紫外激发,最大发射峰位于608nm附近,对应于Eu3+离子的5d0→7f2跃迁,并且Eu3+离子在CaCO3基质中处于偏离或无反演对称中心的格位上。

Preparation of CaCO3:Eu3+, Li+ Red Phosphor by High Temperature Solid-state Reaction Method

CaCO3, Eu2O3 and Li2CO3 were used as primary raw materials to prepare red phosphor CaCO3:Eu3+,Li+ by high temperature solid-state reaction for the first time. The sinter temperature was ensured by analysis of precursor on TG-SDTA. With XRD, FT-IR, Raman spectroscopy and fluorescence photometer examination were used to analyse the structure and fluorescence capability of pattern. The results showed that the sinter temperature was 655 ℃. Eu3+and Li+ acted as luminescent and sensation probe to determine calcite phase of CaCO3, separately. The maximum excitation spectrum of the phosphor peaks was 272 nm, which belonged to UV excitation. The maximum emission wavelength was 608 nm,corresponding to 5d0 →7f 2 of Eu3+, indicating that the Eu3+ ion located in a low symmetry site,or occupied the sites derived from an inversion center in this compound.