One- and two-photon excited luminescence and band-gap assignment in CaWO4
Luminescence properties of CaWO4 have been investigated using complementary one- and two-photon excitation techniques. Analysis of the thermal changes in the luminescence spectra indicates that the observed high-energy shift of the CaWO4 emission maximum is mainly caused by a change of position of t...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2004
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| _version_ | 1797090951530807296 |
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| author | Mikhailik, V Kraus, H Wahl, D Itoh, M Koike, M Bailiff, I |
| author_facet | Mikhailik, V Kraus, H Wahl, D Itoh, M Koike, M Bailiff, I |
| author_sort | Mikhailik, V |
| collection | OXFORD |
| description | Luminescence properties of CaWO4 have been investigated using complementary one- and two-photon excitation techniques. Analysis of the thermal changes in the luminescence spectra indicates that the observed high-energy shift of the CaWO4 emission maximum is mainly caused by a change of position of the intrinsic blue band. The thermal broadening and shift of this band can be interpreted satisfactorily in terms of a model of the luminescence center interacting with the vibrating crystalline environment. The characteristic parameters of the phonon system obtained from the experiment agree with those from earlier independent studies. Intense laser stimulation of CaWO4 in the spectral region <505 nm (>2.45 eV) results in emission with spectral and kinetics features that are characteristic of the radiative decay of a WO42- oxyanion complex in this crystal. The kinetics of luminescence decay under two-photon excitation changes with increasing excitation density due to exchange interaction of the elementary excitations. From a comparative analysis of the optical properties of CaWO 4 obtained in the course of two-photon and one-photon spectroscopic studies (absorption, reflection, one- and two-photon excitation spectra) it is concluded that the energy gap of the crystal is 5.2 ± 0.3 eV. |
| first_indexed | 2024-03-07T03:26:02Z |
| format | Journal article |
| id | oxford-uuid:b91108eb-a2d0-44f1-b2ad-f039d390506a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:26:02Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:b91108eb-a2d0-44f1-b2ad-f039d390506a2022-03-27T05:00:29ZOne- and two-photon excited luminescence and band-gap assignment in CaWO4Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b91108eb-a2d0-44f1-b2ad-f039d390506aEnglishSymplectic Elements at Oxford2004Mikhailik, VKraus, HWahl, DItoh, MKoike, MBailiff, ILuminescence properties of CaWO4 have been investigated using complementary one- and two-photon excitation techniques. Analysis of the thermal changes in the luminescence spectra indicates that the observed high-energy shift of the CaWO4 emission maximum is mainly caused by a change of position of the intrinsic blue band. The thermal broadening and shift of this band can be interpreted satisfactorily in terms of a model of the luminescence center interacting with the vibrating crystalline environment. The characteristic parameters of the phonon system obtained from the experiment agree with those from earlier independent studies. Intense laser stimulation of CaWO4 in the spectral region <505 nm (>2.45 eV) results in emission with spectral and kinetics features that are characteristic of the radiative decay of a WO42- oxyanion complex in this crystal. The kinetics of luminescence decay under two-photon excitation changes with increasing excitation density due to exchange interaction of the elementary excitations. From a comparative analysis of the optical properties of CaWO 4 obtained in the course of two-photon and one-photon spectroscopic studies (absorption, reflection, one- and two-photon excitation spectra) it is concluded that the energy gap of the crystal is 5.2 ± 0.3 eV. |
| spellingShingle | Mikhailik, V Kraus, H Wahl, D Itoh, M Koike, M Bailiff, I One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title | One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title_full | One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title_fullStr | One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title_full_unstemmed | One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title_short | One- and two-photon excited luminescence and band-gap assignment in CaWO4 |
| title_sort | one and two photon excited luminescence and band gap assignment in cawo4 |
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