Photoluminescence of Gd3+ ion in La(OH)(3)

Photoluminescence spectra of La(OH)(3) and La(OH)(3) doped with different a mounts of Gd3+ ions have been investigated. Pure La(OH)(3) is found to be n on-luminescent whereas La(OH)(3) doped with Gd3+ becomes luminescent with c haracteristic emission due to Gd3+ ion at 312 and 306 nn. Other emission ba nds observed are at 320, 345, 465 and 505 nm. In the excitation spectra ban ds at 240, 254 and 273 nm are observed. The IR spectra of the samples show bending and stretching modes of O-H group which support the idea of vibroni c transitions in the La(OH)(3):Gd system. From these results the excitation and emission lines have been attributed to transitions from S-8 --> D-6, I -6 and P-6 --> S-8 respectively.