Abstract

A high-quality Cr³⁺:CdWO₄ single crystal at a size of approximately Φ 25 × 80 mm is grown using the Bridgman method with CdO, WO₃, and Cr₂O₃ as raw materials and their molar ratio of 100:100:0.5. The temperature gradient of solid-liquid interface at growth is approximately 50 °C/cm and the growth rate is 0.05 mm/h. The X-ray diffraction (XRD), absorption, excitation, and emission spectra of different parts of the as-grown and O₂-annealed crystals are investigated. Two strong broad optical absorption bands of about 472 and 708 nm are observed, and they are associated with the transitions ⁴A₂→⁴T₁ and ⁴A₂→⁴T₂. The weak ⁴T₂→²E transition (the R-line) at 632 nm is also observed. The crystal-field parameter Dq and the Racah parameters B and C are estimated to be 1 412.4, 776.8, and 3 427.6 cm^-1, respectively, according to the absorption spectra and crystal-splitting theory. A broadband fluorescence at about 1 000 nm due to ⁴T2→⁴A₂ transition is produced by exciting the samples at 675 nm. After being annealed in an O₂ atmosphere, the crystals become more transparent, while the effective light absorption of Cr³⁺ ions is evidently enhanced and the emission intensity is also strengthened due to the reduction of oxygen vacancies in the CdWO₄ crystal after annealing.

© 2012 Chinese Optics Letters

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