J. Kreissl et al., ELECTRON-PARAMAGNETIC-RESONANCE AND PHOTOLUMINESCENCE STUDIES OF CHROMIUM IN SRS, Applied physics letters, 72(10), 1998, pp. 1232-1234
Isotropic features with hyperfine structures in electron paramagnetic
resonance spectra of SrS powder phosphors, which reflect the abundance
of the natural Cr isotopes, are attributed to the isolated Cr impurit
y. The isotropy, which is typical for a (4)A(2) ground state of a 3d(3
) ion in an octahedral crystal field, and the g value of 1.9795 verify
that Cr is observed in its charged donor state Cr3+. Th, observation
of a broad photoluminescence band with a maximum at 900 nm, which can
be attributed to an internal Cr3+ transition, supports the identificat
ion of the impurity as Cr3+ (C) 1998 American Institute of Physics. [S
0003-6951(98)03410-X].