High Pressure Luminescence of Cr-Related Centers in (3CaO-Ga2O3-3GeO2) Glasses

Author： Barzowska J. Grinberg M. Shen Y.R. Bray K.L. Kukliński B. Buchynski P.P. Padlyak B.V.

ISSN： 0895-7959

Source： International Journal of High Pressure Research, Vol.22, Iss.1, 2002-01, pp. : 47-52

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Abstract

0.01-0.03 wt% Cr-doped 3CaO-Ga₂O₃-3GeO₂ glasses were prepared by a standard high-temperature synthesis method. We have studied ambient-pressure photoluminescence (PL) excitation spectra and high-pressure PL spectra of Cr ions in the glasses. The spectra indicated that Cr ions are very inhomogeneously dispersed in the glass matrix. The PL spectra of bulk samples at ambient conditions consisted of a narrow band (∼14,480 cm⁻¹) with a band width of ∼90 cm⁻¹, a broad high-energy band (∼12,700 cm⁻¹) with a band width of ∼1700 cm⁻¹, and a broad low-energy band (∼10,500 cm⁻¹). High-pressure PL results have provided the unique opportunity for the assignment of the three PL bands. The narrow band (∼14,480 cm⁻¹) is attributed to the ²E→⁴A₂ transition of Cr³⁺ in a high-field. The broad high-energy band (∼12,700 cm⁻¹) is attributed to a phonon sideband of the ²E→⁴A₂ transition. The broad low-energy band (∼10,500 cm⁻¹) is attributed to a possible partly Cr³⁺ or Cr⁵⁺ centers that are weakly bound with the host matrix.