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Electron paramagnetic resonance and photoluminescence studies of chromium in SrS



Applied Physics Letters 72 (1998), No.10, pp.1232-4
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer HHI ()
chromium; crystal field interactions; g-factor; hyperfine structure; paramagnetic resonance; phosphors; photoluminescence; powders; strontium compounds; electron paramagnetic resonance; isotropic features; hyperfine structures; powder phosphors; natural cr isotopes; isolated cr impurity; 4a2 ground state; octahedral crystal field; g value; charged donor state; internal cr3+ transition

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 impurity. The isotropy, which is typical for a 4A2 ground state of a 3d3 ion in an octahedral crystal field, and the g value of 1.9795 verify that Cr is observed in its charged donor state Cr3+. The observation of a broad photoluminescence band with a maximum at 900 nm, which can be attributed to an internal Cr3+ transition, supports the identification of the impurity as Cr3+.