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THE CASE OF INTERNAL TRANSITIONS WITHIN THE SAME CENTER
G The Choice of the Effective Phonon Energy 1iieff
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absorption spectrum approximation atoms Auzel beam Blasse boric acid calculated Ce3+ Chem color centers concentration conduction band configurational coordinate coupling Cr3+ cryptand crystal crystalline curves decay rate defect density doped effect electronic emission spectra emitting energy gap energy migration energy transfer equation Eu3+ excitation exciton experimental exponential F band F center Figure fluorescein fluorescence Fonger force constants frequency function Gd3+ impurity increase intensity interaction ions lamps Lett lifetime low temperatures luminescence matrix measured mode multiphonon nonradiative decay nonradiative process nonradiative rate nonradiative transition observed obtained optical oscillator overlap integral parabolae parameters phonon phosphors Phys pulse pumping quantum efficiency quenching radiationless radiative transition rare earth rare earth ions Reisfeld relaxation Rh6G sample semiconductors sensitivity shows sol-gel Solids spectroscopy Stokes shift structure symmetry Tb3+ technique temperature dependence thermal values vibrational vibronic wavelength X-ray zero-phonon