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Revealing photoluminescence and nonlinear optical absorption characteristics of PbMo0.75W0.25O4 single crystal for optical limiting applications

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dc.contributor.authorDoğan, Anıl
dc.contributor.authorKaratay, Ahmet
dc.contributor.authorIşık, Mehmet
dc.contributor.authorAkhüseyin Yıldız, Elif
dc.contributor.authorGasanly, Nizami Mamed
dc.contributor.authorElmalı, Ayhan
dc.date.accessioned2024-04-29T12:22:51Z
dc.date.available2024-04-29T12:22:51Z
dc.date.issued2024-04-18
dc.descriptionOpen Access; Published by Physica Scripta; https://doi.org/10.1088/1402-4896/ad3aee; A. Dogan, A. Karatay, Elif Akhuseyin Yildiz, A. Elmali, Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100, Ankara, Turkey; M. Isik, Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey; N.M. Gasanly, Department of Physics, Middle East Technical University, 06800, Ankara, Turkey.
dc.description.abstractNonlinear absorption properties of PbMo0.75W0.25O4 single crystal fabricated by the Czochralski method were studied. The band gap energy of the crystal was determined as 3.12 eV. Urbach energy which represents the defect states inside the band gap was found to be 0.106 eV. PbMo0.75W0.25O4 single crystal has a broad photoluminescence emission band between 376 and 700 nm, with the highest emission intensity occurring at 486 nm and the lowest intensity peak at 547 nm, depending on the defect states. Femtosecond transient absorption measurements reveal that the lifetime of localized defect states is found to be higher than the 4 ns pulse duration. Open aperture (OA) Z-scan results demonstrate that the PbMo0.75W0.25O4 single crystal exhibits nonlinear absorption (NA) that includes two-photon absorption (TPA) as the dominant mechanism at the 532 nm excitations corresponding to 2.32 eV energy. NA coefficient (βeff) increased from 7.24 × 10−10 m W−1 to 8.81 × 10−10 m W−1 with increasing pump intensity. At higher intensities βeff tends to decrease with intensity increase. This decrease is an indication that saturable absorption (SA) occurred along with the TPA, called saturation of TPA. The lifetime of the defect states was measured by femtosecond transient absorption spectroscopy. Saturable absorption behavior was observed due to the long lifetime of the localized defect states. Closed aperture (CA) Z-scan trace shows the sign of a nonlinear refractive index. The optical limiting threshold of PbMo0.75W0.25O4 single crystal at the lowest intensity was determined as 3.45 mJ/cm2. Results show that the PbMo0.75W0.25O4 single crystal can be a suitable semiconductor material for optical limiting applications in the visible region.
dc.identifier.citationhttps://hdl.handle.net/20.500.14411/2022
dc.identifier.issn1402-4896
dc.identifier.urihttps://doi.org/10.1088/1402-4896/ad3aee
dc.language.isoen
dc.publisherPhysica Scripta
dc.relation.ispartofseries99
dc.subjectPbMo0.75W0.25O4 crystal
dc.subjectdefect states
dc.subjectnonlinear absorption
dc.subjectoptical limiting
dc.titleRevealing photoluminescence and nonlinear optical absorption characteristics of PbMo0.75W0.25O4 single crystal for optical limiting applications
dc.typeArticle
dspace.entity.typeArticle

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