Optical properties of rutile near its fundamental band gap

A. Amtout and R. Leonelli
Phys. Rev. B 51, 6842 – Published 15 March 1995
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Abstract

We report low-temperature absorption, time-integrated photoluminescence, and resonant-Raman-scattering spectra near the fundamental band gap of TiO2 single crystals. The photoluminescence spectrum comprises a first peak at ħω=3.031 eV, followed by several peaks at lower energies. A polarization study of the emission spectrum indicates that the highest energy peak corresponds to 2pxy dipole-allowed second-class excitonic transitions while the lower-energy peaks are phonon replicas of the 1s quadrupolar exciton. This result is corroborated by time-resolved photoluminescence measurements. The near-band-gap optical response of TiO2 is thus controlled by two distinct exciton states. The Raman-scattering intensity is found to increase slowly for excitation energies in the range 2.7–3 eV. This indicates that the Raman cross-section enhancement is dominated by virtual transitions involving the first dipole-allowed direct gap at 4.2 eV.

  • Received 19 September 1994

DOI:https://doi.org/10.1103/PhysRevB.51.6842

©1995 American Physical Society

Authors & Affiliations

A. Amtout and R. Leonelli

  • Département de Physique et Groupe de Recherche en Physique et Technologie des Couches Minces, Université de Montréal, Case Postale 6128, Succursale Centre-Ville, Montréal, Québec, Canada H3C 3J7

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Vol. 51, Iss. 11 — 15 March 1995

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