STEADY-STATE AND TIME-RESOLVED LASER SPECTROSCOPY OF CR3+ AND ND3+ SINGLY AND DOUBLY DOPED CALCIUM NIOBIUM GALLIUM GARNET

Citation
R. Balda et al., STEADY-STATE AND TIME-RESOLVED LASER SPECTROSCOPY OF CR3+ AND ND3+ SINGLY AND DOUBLY DOPED CALCIUM NIOBIUM GALLIUM GARNET, Physical review. B, Condensed matter, 48(13), 1993, pp. 9279-9290
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
48
Issue
13
Year of publication
1993
Pages
9279 - 9290
Database
ISI
SICI code
0163-1829(1993)48:13<9279:SATLSO>2.0.ZU;2-4
Abstract
The optical properties of C3+, Nd3+, and Cr3:Nd3+ ions in Ca3(GaNb)2Ga 3O12 (CNGG) garnet have been investigated in the 4.2-550 K temperature range by using steady-state and time-resolved laser spectroscopy. The luminescence of trivalent chromium in a singly doped crystal shows a strong thermal quenching above room temperature, which can be analyzed on the basis of the quantum-mechanical single-configurational-coordin ate model by using the Struck-Fonger method. Low-temperature absorptio n, excitation, and time-resolved luminescence spectra of the Nd3+ ion in a singly doped crystal show inhomogeneous broadening associated wit h the existence of different sites for Nd3+ ions. Cr3+-to-Nd3+ radiati ve and nonradiative energy transfer has been demonstrated from the tim e-resolved emission spectra and the decrease of the Cr3+ fluorescence lifetime. The nonradiative Cr3+-->Nd3+ energy transfer is consistent w ith a dipole-dipole transfer process.