Abstract
This paper reports on the photo-luminescence spectroscopic results of congruent strontium–barium–niobate (SBN) crystals doped with Cr 2O, at cryogenic temperature (20 K). The experimental results reveal the need of re-assignment of the Cr 3+ ions defect centres in this material. For first time, a broad emission band in the near infrared region centred at ca. 950 nm is reported. This emission band has micro-seconds decaytime constant and a band-width full-width at half-maximum (FWHM) larger than 1700 cm −1 and has been ascribed to the vibronically assisted 4T 2→ 4A 2 transition. A much narrower emission band centred at ca. 764 nm with milli-seconds decaytime constant and a FWHM band-width of ca. 170 cm −1 is correlated to the 2E→ 4A 2 radiative transition (R-line).
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