Resonant Raman of OH/OD vibrations and photoluminescence studies in LiTaO3 thin film

Details Resonant Raman of OH/OD vibrations and photoluminescence studies in LiTaO3 thin film Resonant Raman of OH/OD vibrations and photoluminescence studies in LiTaO3 thin film

2008-05-26

arxiv.org/abs/0805.3884v1

Journal of applied Physics 104, 033542 (2008)

Physics

Condensed Matter

Materials Science

20 pages

Scientific paper

10.1063/1.2966693

Resonant Raman spectra (RRS) of O-H and O-D vibration and libration modes, their combinations and higher harmonics have been observed in LiTaO3 polycrystalline thin films. RRS peaks are superimposed on photoluminescence (PL) spectrum. Monochromatic light from a xenon lamp is used as excitation source. PL spectrum shows two broad peaks, first near the band gap in UV (4.4-4.8eV) and another in the sub band gap region (< 4.0 eV). Band gap PL along with RRS peaks are reported for the first time. Photoluminescence excitation spectrum (PLE) shows a peak at 4.8 eV. Peak positions and full width at half maximum (FWHM) of RRS peaks depend upon the excitation energy. Dispersions of the fundamental and the third harmonic of the stretching mode of O-H with excitation energy are about 800 cm-1/eV and 2000 cm-1/eV respectively. This dispersion is much higher than reported in any other material.

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