The concentration quenching and crystallographic sites of Eu<sup>2+</sup> in Ca<sub>2</sub>BO<sub>3</sub>Cl |
| |
| Authors: | Li Pan-Laiabc Xu Zheng ab Zhao Su-Ling ab Wang Yong-Sheng ab and Zhang Fu-Jun |
| |
| Institution: | Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044,China;Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China;College of Physics Science & Technology, Hebei University, Baoding 071002, China;Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China |
| |
| Abstract: | A yellow phosphor, Ca2BO3 Cl:Eu2+ , is prepared by the high-temperature solid-state method. Under the condition of excitation sources ranging from ultraviolet to visible light, efficient yellow emission can be observed. The emission spectrum shows an asymmetrical single intensive band centred at 573 nm, which corresponds to the 4f 6 5d 1 →4f 7 transition of Eu2+ . Eu2+ ions occupy two types of Ca2+ sites in the Ca2BO3 Cl lattice and form two corresponding emission centres, respectively, which lead to the asymmetrical emission of Eu2+ in Ca2 BO 3 Cl. The emission intensity of Eu2+ in Ca2BO3 Cl is influenced by the Eu2+ doping concentration. Concentration quenching is discovered, and its mechanism is verified to be a dipole–dipole interaction. The value of the critical transfer distance is calculated to be 2.166 nm, which is in good agreement with the 2.120 nm value derived from the experimental data. |
| |
| Keywords: | luminescence Ca2BO3Cl:Eu2+ concentration quenching crystallographic sites |
| 本文献已被 维普 等数据库收录！ |
|
