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Author Gupta, Bipin Kumar ♦ Kumar, Arun ♦ Kumar, Pawan ♦ Dwivedi, Jaya ♦ Pandey, G. N. ♦ Kedawat, Garima
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ DEPTH ♦ DOPED MATERIALS ♦ DYSPROSIUM ♦ DYSPROSIUM IONS ♦ EUROPIUM ♦ EUROPIUM IONS ♦ EXCITATION ♦ HYDROGEN ♦ PHOTOLUMINESCENCE ♦ SECURITY ♦ TRAPS ♦ ULTRAVIOLET RADIATION ♦ WAVELENGTHS
Abstract Herein, a novel green emitting long-persistent Sr{sub 3}SiAl{sub 4}O{sub 11}:Eu{sup 2+}/Dy{sup 3+} phosphor was synthesized in a single phase form using facile solid state reaction method under the reducing atmosphere of 10% H{sub 2} and 90% N{sub 2}. The resulting phosphor exhibits hyper-sensitive strong broad green emission, peaking at 510 nm upon 340 nm excitation wavelength, which is attributed to the 4f{sup 6}5d{sup 1}-4f{sup 7} transitions of emission center of europium (Eu{sup 2+}) ions. Moreover, the incorporation of dysprosium (Dy{sup 3+}) ions, which act as effective hole trap centers with appropriate depth, largely enhances the photoluminescence characteristics and greatly improves the persistent intense luminescence behavior of Sr{sub 3}SiAl{sub 4}O{sub 11}:Eu{sup 2+}/Dy{sup 3+} phosphor under ultraviolet (UV) excitation. In addition, with the optimum doping concentration and sufficient UV excitation time period, the as-synthesized phosphor can be persisted afterglow for time duration ∼4 h with maximum luminescence intensity. Thus, these results suggest that this phosphor could be expected as an ultimate choice for next generation advanced luminescent materials in security applications such as latent finger-marks detection, photo-masking induced phosphorescent images, and security code detection.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-06-28
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 117
Issue Number 24


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