We report a reddish orange long-lasting phosphor of KY_(3)F_(10):Sm^(3+)synthesized by a solid-state reaction for applications in x-ray or cathode-ray tubes.The spectrum contains a group of reddish orange emission lin...We report a reddish orange long-lasting phosphor of KY_(3)F_(10):Sm^(3+)synthesized by a solid-state reaction for applications in x-ray or cathode-ray tubes.The spectrum contains a group of reddish orange emission lines originating from^(4)G_(5/2)→^(6)H_(J)transitions of Sm^(3+).The Judd-Ofelt theory is introduced to analyze the optical transitions of the Sm^(3+)ions.Moreover,phosphorescence characteristics are discussed.The energy charging and release processes of the phosphor are measured and the phosphorescence decay time with 10%of initial intensity is about 40.7 seconds.The order of kinetics and the activation energy are obtained according to the thermoluminescence curve.The phosphorescence mechanism is proposed based on structural analysis and thermoluminescence glow curve measurement.展开更多
High-quality KMgF_3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method.X-ray diffraction(XRD),photoluminescence spectra and fluorescence lifetime were measured.The results ind...High-quality KMgF_3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method.X-ray diffraction(XRD),photoluminescence spectra and fluorescence lifetime were measured.The results indicate the reduction of Eu^(3+)to Eu^(2+)in the KMgF_3 single crystal.Under the excitation of 259 nm,370 nm and 394 nm,the sample has two distinct emissions of Eu^(2+):4f^7→4f^7(～363 nm)and 4f^65d^1→4f^7(～440 nm).The substitution site for Eu ion is confirmed.The optical property investigation result shows that the Eu^(2+)doped KMgF_3 single crystal may be used as potential laser media and related materials for optical devices.展开更多
The growth of Na5Lu9F32 single crystals doped with Cr3＋ ions in 0.1 mol%, 0.2 tool% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate ...The growth of Na5Lu9F32 single crystals doped with Cr3＋ ions in 0.1 mol%, 0.2 tool% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate that the Cr dopant enters Na5Lu9F32 as Cr3＋. Fluorescence emission at wavelengths of 418 nm, 444 nm, 653 nm and 678 nm can be observed under the excitation of 372 nm and the fluorescence lifetime at 418 nm was measured to be^10.31 μs. The possible crystal sites for Cr3＋ ions in Na5Lu9F32 single crystal were discussed, and the lattice parameter Dq, Racach parameters B and C were estimated.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11104024,50972021,61078061 and 11104023the Natural Science Foundation of Liaoning Province(20092147)+1 种基金Foundation of Education Department of Liaoning Province under Grant No L2010056Fundamental Research Funds for the Central/Kernel Universities under Grant Nos 2011JC037,2011JC036,2011ZD032 and 2011ZD033.
文摘We report a reddish orange long-lasting phosphor of KY_(3)F_(10):Sm^(3+)synthesized by a solid-state reaction for applications in x-ray or cathode-ray tubes.The spectrum contains a group of reddish orange emission lines originating from^(4)G_(5/2)→^(6)H_(J)transitions of Sm^(3+).The Judd-Ofelt theory is introduced to analyze the optical transitions of the Sm^(3+)ions.Moreover,phosphorescence characteristics are discussed.The energy charging and release processes of the phosphor are measured and the phosphorescence decay time with 10%of initial intensity is about 40.7 seconds.The order of kinetics and the activation energy are obtained according to the thermoluminescence curve.The phosphorescence mechanism is proposed based on structural analysis and thermoluminescence glow curve measurement.
基金supported by the National Natural Science Foundation of China(Nos.51772159,51472125,11504188 and U1504626)the Natural Science Foundation of Zhejiang Province(No.LZ17E020001)K.C.Wong Magna Fund in Ningbo University
文摘High-quality KMgF_3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method.X-ray diffraction(XRD),photoluminescence spectra and fluorescence lifetime were measured.The results indicate the reduction of Eu^(3+)to Eu^(2+)in the KMgF_3 single crystal.Under the excitation of 259 nm,370 nm and 394 nm,the sample has two distinct emissions of Eu^(2+):4f^7→4f^7(～363 nm)and 4f^65d^1→4f^7(～440 nm).The substitution site for Eu ion is confirmed.The optical property investigation result shows that the Eu^(2+)doped KMgF_3 single crystal may be used as potential laser media and related materials for optical devices.
基金supported by the National Natural Science Foundation of China(Nos.51772159,51472125,11504188 and U1504626)the Natural Science Foundation of Zhejiang Province(No.LZ17E020001)K.C.Wong Magna Fund in Ningbo University
文摘The growth of Na5Lu9F32 single crystals doped with Cr3＋ ions in 0.1 mol%, 0.2 tool% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate that the Cr dopant enters Na5Lu9F32 as Cr3＋. Fluorescence emission at wavelengths of 418 nm, 444 nm, 653 nm and 678 nm can be observed under the excitation of 372 nm and the fluorescence lifetime at 418 nm was measured to be^10.31 μs. The possible crystal sites for Cr3＋ ions in Na5Lu9F32 single crystal were discussed, and the lattice parameter Dq, Racach parameters B and C were estimated.
