Ce3+,Eu3+ and Tb3+ singly doped and Ce3+/Eu3+ and Ce3+/Tb3+ co-doped zinc phosphate glasses were prepared by sintering P2O5,ZnO,Ce2(C2O4)3·10H2O and Eu2O3/Tb4O7 mixtures at 1200 °C in the air for 2 h and the...Ce3+,Eu3+ and Tb3+ singly doped and Ce3+/Eu3+ and Ce3+/Tb3+ co-doped zinc phosphate glasses were prepared by sintering P2O5,ZnO,Ce2(C2O4)3·10H2O and Eu2O3/Tb4O7 mixtures at 1200 °C in the air for 2 h and then annealing at 450 °C for 10 h.The obtained glasses were homogeneous and transparent.The glasses without Ce3+ were colorless and those with Ce3+ showed slightly yellow.The singly doped glasses showed strong emissions and excitations from doped trivalent rare earth ions.Strong energy transfer from Ce3+ to...展开更多
The spin-orbit interaction of the 5d electron needs to be taken into account to give the proper energy structure for the 4fN-1 5d configuration of heavy lanthanide ions occupying a site with ligands forming an octahed...The spin-orbit interaction of the 5d electron needs to be taken into account to give the proper energy structure for the 4fN-1 5d configuration of heavy lanthanide ions occupying a site with ligands forming an octahedron. This paper derives theoretical results for the energy structure by treating the t2 orbitals as quasi p orbitals and then using angular-momentum coupling techniques. An analytic expression for the electric dipole absorption line strengths between 4fN multiplets and 4fN- 1 5d states is given in terms of various angular-momentum quantum numbers and re-coupling coefficients. The result is then applied to interpret the excitation spectrum of Cs2NaYF6:Er3+. Tbe high-spin and lowspin states of Cs2NaYF6:Er3+ are discussed in terms of the wavefunctions obtained by using the developed theoretical model.展开更多
The simple model for 4f-5d transitions of lanthanide ions in crystals was extended to deal with the case of the octahedral crystal field, where for the t2 component of 5d orbitals the spin-orbit interaction could not ...The simple model for 4f-5d transitions of lanthanide ions in crystals was extended to deal with the case of the octahedral crystal field, where for the t2 component of 5d orbitals the spin-orbit interaction could not be neglected due to incomplete quenching of the 5d orbital angular momentum. The energy levels for the 4fN-15d configuration and the relative line strengths for the 4fN4fN-15d transition were calculated in detail. The result was applied to the interpretation of the low-temperature 4f-5d excitation spectrum of Cs2NaYCl6∶Tb3+.展开更多
The 4f-5d transitions of Er3+ ions doped in crystals were widely studi ed due to their potential applications in quantum cutting phosphors and VUV lase rs,etc.The theory to do the calculations of 4f-5d transitions and...The 4f-5d transitions of Er3+ ions doped in crystals were widely studi ed due to their potential applications in quantum cutting phosphors and VUV lase rs,etc.The theory to do the calculations of 4f-5d transitions and various rela ted aspects,such as the ways to determining various parameters,were summarized .The impacts of various interactions on the spectra were also demonstrated clea rly with Er3+ ions in crystals CaF2 and LiYF4.Predicted results were compared w ith measured spectra.展开更多
基金supported by the National Natural Science Foundation of China (10704090, 10874253)Foundation of the Education Committee of Chongqing (10874173)
文摘Ce3+,Eu3+ and Tb3+ singly doped and Ce3+/Eu3+ and Ce3+/Tb3+ co-doped zinc phosphate glasses were prepared by sintering P2O5,ZnO,Ce2(C2O4)3·10H2O and Eu2O3/Tb4O7 mixtures at 1200 °C in the air for 2 h and then annealing at 450 °C for 10 h.The obtained glasses were homogeneous and transparent.The glasses without Ce3+ were colorless and those with Ce3+ showed slightly yellow.The singly doped glasses showed strong emissions and excitations from doped trivalent rare earth ions.Strong energy transfer from Ce3+ to...
基金supported by the National Natural Science Foundation of China(Grant Nos 10874173 and 10774140)
文摘The spin-orbit interaction of the 5d electron needs to be taken into account to give the proper energy structure for the 4fN-1 5d configuration of heavy lanthanide ions occupying a site with ligands forming an octahedron. This paper derives theoretical results for the energy structure by treating the t2 orbitals as quasi p orbitals and then using angular-momentum coupling techniques. An analytic expression for the electric dipole absorption line strengths between 4fN multiplets and 4fN- 1 5d states is given in terms of various angular-momentum quantum numbers and re-coupling coefficients. The result is then applied to interpret the excitation spectrum of Cs2NaYF6:Er3+. Tbe high-spin and lowspin states of Cs2NaYF6:Er3+ are discussed in terms of the wavefunctions obtained by using the developed theoretical model.
基金the National Natural Science Foundation of China (NSFC10474092 ,50332050)the City University of Hong Kong Research Grant (9360123)
文摘The simple model for 4f-5d transitions of lanthanide ions in crystals was extended to deal with the case of the octahedral crystal field, where for the t2 component of 5d orbitals the spin-orbit interaction could not be neglected due to incomplete quenching of the 5d orbital angular momentum. The energy levels for the 4fN-15d configuration and the relative line strengths for the 4fN4fN-15d transition were calculated in detail. The result was applied to the interpretation of the low-temperature 4f-5d excitation spectrum of Cs2NaYCl6∶Tb3+.
基金supported by the National Natural Science Foundations of China (51961145101)Guangzhou Science & Technology Project (202007020005)+3 种基金the Project Supported by Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (GDUPS, 2018) for Prof. Bingfu Leithe National Key R&D Program of China (2020YFB0407902)Guangdong Provincial Science & Technology Project (2021A0505050006 and 2021B0707010003)Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (2021KJ122)。
基金Project supported by the National Natural Science Foundation of China (10874173,10704090,11074315,11011120083)the Foundation of the Education Committee of Chongqing (KJ090523)the Knowledge Innovation Project of the Chinese Academy of Sciences (KJCX2-YW-M1)
文摘The 4f-5d transitions of Er3+ ions doped in crystals were widely studi ed due to their potential applications in quantum cutting phosphors and VUV lase rs,etc.The theory to do the calculations of 4f-5d transitions and various rela ted aspects,such as the ways to determining various parameters,were summarized .The impacts of various interactions on the spectra were also demonstrated clea rly with Er3+ ions in crystals CaF2 and LiYF4.Predicted results were compared w ith measured spectra.