Cr3+Fluorescence in Garnets and Other Crystals

Abstract

The results of a study of the sharp-line fluorescence of Cr 3+ in a number of crystals is presented. The host crystals were several diamagnetic garnets, a spinel, and emerald. The results are used to discuss two aspects of the sharp-line energy levels. First, some of the dynamical aspects are considered. The measurements of the temperature dependence of the sharp no-phonon iMine positions, linewidths, and efficiencies are in reasonable agreement with the existing theory. The theory assumes a simple form for the interaction of the Cr 3+ energy levels with the phonons and uses a Debye density of states. The phonon-assisted radiation is also discussed. Second, some of the static aspects of the energy levels are considered. The splittings between the no-phonon R lines along with splittings of the ground states of the Cr 3+ in the same crystals are compared with the predictions of existing theories. Here the agreement is very poor. The experimental data show the difference between the Cr 3+ energy levels, when odd terms in addition to usual even crystal-field terms exist. The data also indicate some large nonlinearities between the energy-level splittings and the crystal field.

Stimulated emission spectroscopy: A review

“…For the Nd 3 + ions substituting y3+ we havef ~ 0.15 and To ~ 635 ~ K. This is in good agreement with the value To 600 ~ K. Similarly, for the cr 3 + ions which replace a part of A13 + ions in the shell, we havef ~ 0.1 and To ~-575~ while the experimental value is 560 ~ K [46].…”

Luminescence properties of Cr3+:Y3Al5O12 nanocrystals

“…Therefore, many papers describing the optical properties of YAG single crystal doped with Cr 4+ and also Cr 3+ ions can be found [7][8][9][10] However, much less research was carried out on transition metal ions-doped nanocrystalline YAG. The synthesis and optical studies of Co 2+ -doped YAG nanocrystalline powders prepared by sol-gel technique were reported by Sun et al [11].…”

Combustion synthesized MgAl2O4:Cr phosphors—An EPR and optical study

“…The emission spectrum in Fig. 5b [20,21], and give some accurate positioning of R line. The R-line positions of a YAG:Cr 3+ single crystal was located at 686-689 nm at RT.…”