The concentration quenching and crystallographic sites of Eu^(2+) in Ca_2BO_3Cl  

作　　者：李盼来 徐征 赵谡玲 王永生 张福俊 

机构地区：[1]Key Laboratory of Luminescence and Optical Information,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China [2]Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing 100044,China [3]College of Physics Science&Technology,Hebei University,Baoding 071002,China [4]Key Laboratory of Luminescence and Optical Information,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Chinese Physics B》2012年第4期555-559,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10974013, 60978060, and 10804006);the Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20090009110027);the Beijing Municipal Natural Science Foundation, China (Grant No. 1102028);the National Basic Research Program of China (Grant No. 2010CB327704);the National Natural Science Foundation for Distinguished Young Scholars (Grant No. 60825407);the Beijing Municipal Science and Technology Commission, China (Grant No. Z090803044009001);the Science Fund of the Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, China (Grant No. 2010LOI12);the Excellent Doctor's Science and Technology Innovation Foundation of Beijing Jiaotong University, China (Grant No. 2011YJS073)

摘　　要：A yellow phosphor, Ca2BO3CI：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 4f65dl→4f7 transition of Eu2＋. Eu2＋ ions occupy two types of Ca2＋ sites in the Ca2BO3C1 lattice and form two corresponding emission centres, respectively, which lead to the asymmetrical emission of Eu2＋ in Ca2BO3C1. The emission intensity of Eu2＋ in Ca2BO3C1 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.A yellow phosphor, Ca2BO3CI：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 4f65dl→4f7 transition of Eu2＋. Eu2＋ ions occupy two types of Ca2＋ sites in the Ca2BO3C1 lattice and form two corresponding emission centres, respectively, which lead to the asymmetrical emission of Eu2＋ in Ca2BO3C1. The emission intensity of Eu2＋ in Ca2BO3C1 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.

关 键 词：LUMINESCENCE Ca2BO3CI：Eu2＋ concentration quenching crystallographic sites 

分 类 号：O482.31[理学—固体物理]