水热法合成CaCO_3:Eu^(3+)红色荧光粉(英文)  

HYDROTHERMAL SYNTHESIS OF RED PHOSPHORS CaCO_3:Eu^(3+)

作　　者：孙蓉[1] 燕文清[1] 刘军[1,2] 王兴明[1] 康明[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]海洋王照明科技股份有限公司,深圳518052

出　　处：《硅酸盐学报》2010年第2期332-337,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(10476024);四川省科技厅应用基础(2006J13-059);先进建筑材料四川省重点实验室基金(08zxxp10)资助项目

摘　　要：采用低温水热法在150℃不同时间反应下合成了一系列红色荧光粉CaCO3:1%(inmole)Eu3+。利用扫描电子显微镜、X射线衍射和荧光光谱仪等分别对样品的形貌、结构和发光性能进行了表征。结果表明:样品具有立方体的方解石型和针状的文石型结构,其文石型与方解石型的摩尔比随着反应时间的延长而增加。当反应时间达到24h时,样品的发光强度最高,此时样品为针状的无团聚的文石型结构。Eu3+作为发光中心进入到不同晶型的CaCO3晶格中并占据非中心对称格位。样品的277nm附近的最强激发峰是由Eu3+-O2-电荷迁移跃迁引起的,属于宽带激发;另外,在300～550nm处存在窄的激发峰,归属于Eu3+的4f-4f激发跃迁。样品的最大发射峰值均位于614nm附近,属于红色发光,对应于Eu3+的电偶极跃迁5D0→7F2。Eu3＋-doped CaCO3 red phosphors with a final mole ratio of Ca2＋ to Eu3＋ at 100：1 were synthesized via a low temperature hydrothermal route at 150 ℃ for different reaction time.The morphology,structure and luminescent properties of the samples were characterized by scanning electron microscopy,X-ray powder diffraction,photoluminescence and photoluminescence excitation （PL-PLE） spectra,respectively.The results indicate that the samples of the calcite have cubic shape and the aragonite with needle-like shape.The mole ratio of aragonite to calcite increases with increasing of the reaction time.When reaction time to reach 24 h,the luminescent intensity of CaCO3：Eu3＋ is the highest,and the sample has evenly dispersed the aragonite with needle-like shape.Eu3＋ acts as a luminescent center to replace the Ca2＋ site in the different crystal lattices and locate in an asymmetric position.The PLE spectra of all samples show that the main intense broad band with the maximum at about 277 nm is contributed by the charge transfer transition of Eu3＋-O2-,and the week sharp lines in 300-550 nm range in the spectra are assigned to the intra-configurational 4f-4f transitions of Eu3＋.The maximal emission peak locates in the vicinity of 614 nm,corresponding to electric-dipole transition 5D0→7F2 of Eu3＋.

关 键 词：碳酸钙 铕离子 水热法 红色荧光粉 

分 类 号：O482.3[理学—固体物理]