CaCO_3基红色荧光粉的合成及其光谱性能分析

Preparation and Spectrum Properties of the CaCO_3-based Red Phosphor

采用水热法合成CaCO3∶Eu3+和CaCO3∶Eu3+,Li+红色荧光粉,研究了掺杂离子对样品的物相、晶粒形貌和光谱性质的影响。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅立叶红外光谱(FT-IR)、激光拉曼光谱(Raman)和荧光光谱(PL-PLE)等手段表征样品的性能。结果表明:样品均为三角晶系的方解石结构;Eu3+作为发光中心取代了基质CaCO3中Ca2+的位置;Li+作为电荷补偿剂有助于Eu3+更好的进入到基质的晶格中,提高样品的发光性能;样品CaCO3∶Eu3+和CaCO3∶Eu3+,Li+的最大激发峰分别位于254 nm(Eu3+-O2-的电荷迁移跃迁)和396 nm(7F0→5L6跃迁),其最强发射峰分别位于616 nm和610 nm,均为电偶极跃迁5D0→7F2,属于红色发光。

CaCO3 ： Eu^3＋ and CaCO3 ： Eu^3＋ , Li ^＋ red emitting phosphors were synthesized by hydrothermal method. The structure, morphology and spectrum properties were studied by XRD, SEM, FT-IR, Raman and PL-PLE spectra. The results indicate that the samples of CaCO3： Eu^3＋ and CaCO3： Eu^3＋ , Li ^＋ belong to the calcite structure of trigonal system. Eu^3＋ acts as a luminescent center replaces Ca^2＋ site without changing the crystal structure of CaCO3. The Li ^＋ as a charge compensator plays the role to promote effectively an incorporation of Eu^3＋ into CaCO3, which enhances the luminescence intensity. The maximum excitation peak of the CaCO3： Eu^3＋ and CaCO3： Eu^3＋ , Li ^＋ phosphors were 254 nm （the charge transfer transition of Eu^3＋ -O^2- ） and 396 nm （^7F0→^5L6 transition of Eu^3＋ ）, respectively. The maximum emission wavelength was 616 nm and 610 nm, corresponding to the samples CaCO3： Eu3^＋ and CaCO3： Eu^3＋, Li ^＋ , respectively, which all belong to electric-dipole transition ^5D0→^7F2 and red luminescence.