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A simple model for the f?d transition of actinide and heavy lanthanide ions in crystals
Chang-Kui Duan,Michael F. Reid,Gang Ruan 한국물리학회 2006 Current Applied Physics Vol.6 No.3
The original simple model for 4f5d transitions [C.K. Duan, M.F. Reid, G.W. Burdick, Phys. Rev. B 6 (2002) 155108; C.K. Duan,M.F. Reid, J. Solid State Chem. 171 (2003) 299], which assumes a stronger exchange Coulomb interaction between 4forbitals and 5dorbitals than the 4fspinorbit interaction, is extended to the case where the eect of thef(4ffor heavy lanthanide and 5ffor actinidef5dspectra of heavy lanthanide and actinide ions in crystals.
Local field effects on the radiative lifetimes of Ce3+ in different hosts
Chang-Kui Duan,Michael F. Reid 한국물리학회 2006 Current Applied Physics Vol.6 No.3
For emitters embedded in media of various refractive indices, dierent theoretical models predict substantially dierent dependenciesof the spontaneous emission lifetime on the refractive index. It has been claimed that various measurements of 4f! 4f radiative lifetimesof Eu3+ in hosts with variable refractive index appear to favor the real-cavity model [D. Toptygin, J. Fluoresc. 13 (2003) 201 and ref-erences therein; G.M. Kumar, D.N. Rao, Phys. Rev. Lett. 91(2003) 203903]. The 5d! 4f radiative transition of rare-earth ions are dom-test of the dierent models. We analyze the lifetimes of the 5d! 4f transition of Ce3+ in hosts of refractive indices varying from 1.4 to2.2. The results favor the macroscopic virtual-cavity model based on the Lorentz local eld [D. Toptygin, J. Fluoresc. 13 (2003) 201].