【作者】 李盼来； 徐征； 赵谡玲； 王永生；

【Author】 LI Panlai~(1,2) XU Zheng~(*1) ZHAO Suling~1 WANG Yongsheng~1 (1 Key Laboratoiy of Luminescence and Optical Information(Beijing Jiaotong University),Ministry of Education,Beijing 100044,China Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing 100044,China) (2 College of Physics Science & Technology,Hebei University,Baoding 071002,China)

【机构】 北京交通大学发光与光信息技术教育部重点实验室,北京交通大学光电子技术研究所； 河北大学物理科学与技术学院；

【摘要】 采用高温固相法,以高纯CaCO₃、H₃BO₃、CaCl₂和Eu₂O₃为原料,制备了Ca₂BO₃Cl:Eu²⁺黄色发光材料,采用XRD及光谱技术等表征了材料的性质。依据Dexter理论,计算了Eu²⁺在Ca2BO3Cl中的浓度猝灭机理,得出其为电多极相互作用;依据寿命结果,得出Eu²⁺在Ca₂BO₃Cl中占据了两种晶体学格位,且处于两格位的Eu³⁺存在明显的能量传递。更多还原

【Abstract】 The Ca₂BO₃Cl:Eu²⁺ phosphor was synthesized by the general high temperature solid-state reaction.The starting materials used in the preparation of this phosphor were pure powders greater than 99.9%of CaCO₃,H₃BO₃,CaCl₂ and Eu₂O₃.After the individual materials have been mixed sufficiently, the powder was heated at 900℃for 2.5 h under 5:95（H2/N2） atmosphere to reduce to Eu²⁺ activators. The obtained products were crystalline Ca₂BO₃Cl:Eu²⁺ yellow phosphors.The products were characterized by powder X-ray diffraction（XRD）.The excitation and emission spectra of the phosphor were measured by a SHIMADZU RF-540 ultraviolet spectrophotometer.And the energy transfer between activators and photolumiescence properties of Eu²⁺ in Ca₂BO₃Cl were researched.According to the Dexter theory,the concentration quenching mechanisms of Eu²⁺ in Ca₂BO₃Cl was analysed,and the results show that the mechanisms are the electric multipolar interaction.According to the decay results,we reveled that the energy transfer taking place between Eu²⁺ activators located at two different crystaiiographic sites in the Ca2B03Ci structure.更多还原