VUV spectroscopic properties of rare-earth (RE3+ = Sm3+, Eu3+, Tb3+, Dy3+) -activated layered borate Ba6Gd9B79O138 |
| |
| Affiliation: | 1. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur, C.G., 492010 India;2. Department of Physics, Govt. Arts and Commerce Girls College, Devendra Nagar, Raipur, C.G., India;1. Department of Pulmonary and Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, 510280, China;2. NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China;3. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China;1. Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India;2. Department of Chemistry, UIET, Maharshi Dayanand University, Rohtak 124001, India;1. College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, PR China;2. College of Chemical Biological and Environmental Engineering, Xiangnan University, Chenzhou, Hunan, 423043, PR China;3. Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, 402160, PR China |
| |
| Abstract: | Vacuum ultraviolet (VUV) spectroscopic properties of rare-earth RE3+- activated (RE3+ = Sm3+, Eu3+, Tb3+ and Dy3+) Ba6Gd9B79O138 borates (BGBO) are investigated. The strong absorption bands in the VUV range of un-doped and RE3+-activated BGBO were observed. The band range from 140 to 200 nm with a peak at about 173 nm results from the host lattice absorption. For Sm3+-activated BGBO, the charge transfer transition from O2- to Sm3+ was observed at 202 nm. In addition, it exhibits bright red emission originating from the Sm3+ f-f transitions of 4G5/2 → 6HJ (J = 5/2, 7/2 and 9/2). The O2--Eu3+ charge transfer (CT) at 249 nm is observed in the excitation spectrum for Eu3+-doped BGBO. For Tb3+-activated BGBO, the broad bands around 208 and 230 nm are due to the spin-allowed and spin-forbidden f-d transitions of Tb3+, respectively. In addition, the absence of the f-d transitions of Sm3+ and Dy3+ in the excitation spectra probably due to the photo-ionization effect. It is demonstrated that there are energy transfers from the BGBO host lattice to the luminescent activators depending on the activators. |
| |
| Keywords: | VUV Luminescence Rare-earth Borate |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
