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• W2046463423 abstract "LiAl5O8 has the inverse spinel structure. It exhibits a strong red fluorescence when lightly doped with Fe3+. Measurements were made of the fluorescence and excitation spectra of Fe3+ in both the ordered and the disordered phases of LiAl5O8:Fe. The fluorescence of the ordered phase has its maximum at 680 nm, and consists of two components with maxima at 675 nm and 730 nm. The positions and intensities of these components are temperature independent from 77°K to at least 400°K. The decay of the fluorescence consists of two simple exponential decays with τ = 6.20 msec and τ = 1.72 msec; the longer decay time is associated with the shorter wavelength, more intense component. The fluorescence of the disordered phase is shifted toward longer wavelengths and apparently consists of only one component. It has a much more temperature dependent intensity, and has a nearly single exponential decay, with τ = 3.40 msec at 300°K. There is evidence in the ordered phase of the presence of a 6A1(6S)→2T2(2I) transition due to Fe3+. No such evidence is seen in the disordered phase. We can say with reasonably certainty that in the ordered phase the Fe3+ ions are situated at sites with tetrahedral symmetry (A sites). Spin resonance suggests that in the disordered phase, substantial numbers of Fe3+ ions occupy octahedral sites. Although the difference between fluorescence wavelengths observed in these two phases is consistent with this suggestion, no clear conclusion can be drawn regarding the location of the Fe3+ ions in the disordered phase. Efforts to obtain good theoretical agreement between the observed optical transitions of Fe3+ and transition energies calculated from crystal field theory have not been successful." @default.
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• W2046463423 date "1970-01-01" @default.
• W2046463423 modified "2023-09-26" @default.
• W2046463423 title "The fluorescence of Fe3+ in ordered and disordered phases of LiAl5O8" @default.
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• W2046463423 doi "https://doi.org/10.1016/0022-2313(70)90050-5" @default.
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