The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ i...The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ ion concentration in GdPP:Sm,Pr crystals on the emission intensity of 4 G 5/2 → 6 H 7/2 transitions of Sm 3+ ion and the energy transfer between Sm 3+ and Pr 3+ ions have been investigated and discussed.展开更多
In this paper,the single crystals of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP: Sm,Pr)were grown by the hydrothermal method.The process of growing crystal is th e formation and grown up of new phase. Whether new phase can appear ...In this paper,the single crystals of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP: Sm,Pr)were grown by the hydrothermal method.The process of growing crystal is th e formation and grown up of new phase. Whether new phase can appear and how can occur,which is driven by the force of phase transformation.It is necessary to co ntrol this process by the concentration in the hydrothermal solution.In the syst em of cohesive phosphoric acid growing crystal is a process of complex chemical reaction,in which nucleation depends on the stability of small cluster and on ho w many of them form,so the number of controllable nucleation is very complex sta tistical problem.The natural face and high optical quality of single crystal can be preserved by adding a seed which is cut from large crystal. The crystal structure of GdPP:Sm,Pr,isotypic with monoclinic (space group PZ 1/ c )GdPP,has been checked by X ray powder diffraction and emission and em is sion spectrum were measured and analyzed in the range from ultraviolet to visibl e at room temperature.The dependence of containg different Pr 3+ ion concent rations on the emission intensities of 4 G 5/2 → 6 H 7/2 tran sition of Sm 3+ ion have been discussed in the GdPP:Sm,Pr crystals.The energ y transfer between Sm 3+ and Pr 3+ ions have been investigated.展开更多
The energy transfer phenomenon of Ce→Gd→Tb via Gd sublattice and its depandence has been investigated in GdxY-1-xP5O14:Ce,Tb.The fluorescent and excitation spectra of Gdp5O14,Gdp5O14:Ce,Gdp5O14:Tb and GdxY-1xP5O14:C...The energy transfer phenomenon of Ce→Gd→Tb via Gd sublattice and its depandence has been investigated in GdxY-1-xP5O14:Ce,Tb.The fluorescent and excitation spectra of Gdp5O14,Gdp5O14:Ce,Gdp5O14:Tb and GdxY-1xP5O14:Ce,Tb and absorption spectrum of Gdp5O14 have been studied.The results show that as x is larger than 0.7.the energy transfer from Ce3+ via Gd3+to Tb3+ is obvious.The main reason for the energy transfer of Ce→Gd→Tb being efficient in the region x>0.7 is that the spectral overlap between Ce3+ emission spectrum and Gd3+ absorption spectrum increases and the structure changes from monoclinic Ⅱ(C2/c) layer structure(x<0.7) to monoclinic I(P21/c) ribbon structure.展开更多
Preparation, structure and spectral properties of rare earth pentaphosphates Gd_xY_(1-x)P_5O_(14): Ce, Tb have been investigated. When x>0. 7, the pentaphosphates belong to monoclinic crystal system Ⅰ with space g...Preparation, structure and spectral properties of rare earth pentaphosphates Gd_xY_(1-x)P_5O_(14): Ce, Tb have been investigated. When x>0. 7, the pentaphosphates belong to monoclinic crystal system Ⅰ with space group P2_1/c (C). When x≤0. 7. they belong to monoclinic crystal system Ⅱ with C2/c (C). The fluorescent and excitation spectra of Gdp_5O_(14), GdP_5O_(14): Ce. GdP_5O_(14) : Tb and Gd_xY_(1-x)P_5O_(14) : Ce, Tb have been studied and the energy transfer phenomenon from Ce(3+)→Gd(3+)→Tb(3+) by the medium of Gd(3+) sublattice has been determined.展开更多
文摘The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ ion concentration in GdPP:Sm,Pr crystals on the emission intensity of 4 G 5/2 → 6 H 7/2 transitions of Sm 3+ ion and the energy transfer between Sm 3+ and Pr 3+ ions have been investigated and discussed.
基金This project was supported by the National Natural Sciences Foundation of China
文摘In this paper,the single crystals of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP: Sm,Pr)were grown by the hydrothermal method.The process of growing crystal is th e formation and grown up of new phase. Whether new phase can appear and how can occur,which is driven by the force of phase transformation.It is necessary to co ntrol this process by the concentration in the hydrothermal solution.In the syst em of cohesive phosphoric acid growing crystal is a process of complex chemical reaction,in which nucleation depends on the stability of small cluster and on ho w many of them form,so the number of controllable nucleation is very complex sta tistical problem.The natural face and high optical quality of single crystal can be preserved by adding a seed which is cut from large crystal. The crystal structure of GdPP:Sm,Pr,isotypic with monoclinic (space group PZ 1/ c )GdPP,has been checked by X ray powder diffraction and emission and em is sion spectrum were measured and analyzed in the range from ultraviolet to visibl e at room temperature.The dependence of containg different Pr 3+ ion concent rations on the emission intensities of 4 G 5/2 → 6 H 7/2 tran sition of Sm 3+ ion have been discussed in the GdPP:Sm,Pr crystals.The energ y transfer between Sm 3+ and Pr 3+ ions have been investigated.
文摘The energy transfer phenomenon of Ce→Gd→Tb via Gd sublattice and its depandence has been investigated in GdxY-1-xP5O14:Ce,Tb.The fluorescent and excitation spectra of Gdp5O14,Gdp5O14:Ce,Gdp5O14:Tb and GdxY-1xP5O14:Ce,Tb and absorption spectrum of Gdp5O14 have been studied.The results show that as x is larger than 0.7.the energy transfer from Ce3+ via Gd3+to Tb3+ is obvious.The main reason for the energy transfer of Ce→Gd→Tb being efficient in the region x>0.7 is that the spectral overlap between Ce3+ emission spectrum and Gd3+ absorption spectrum increases and the structure changes from monoclinic Ⅱ(C2/c) layer structure(x<0.7) to monoclinic I(P21/c) ribbon structure.
文摘Preparation, structure and spectral properties of rare earth pentaphosphates Gd_xY_(1-x)P_5O_(14): Ce, Tb have been investigated. When x>0. 7, the pentaphosphates belong to monoclinic crystal system Ⅰ with space group P2_1/c (C). When x≤0. 7. they belong to monoclinic crystal system Ⅱ with C2/c (C). The fluorescent and excitation spectra of Gdp_5O_(14), GdP_5O_(14): Ce. GdP_5O_(14) : Tb and Gd_xY_(1-x)P_5O_(14) : Ce, Tb have been studied and the energy transfer phenomenon from Ce(3+)→Gd(3+)→Tb(3+) by the medium of Gd(3+) sublattice has been determined.
