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Photoluminescence due to efficient energy transfer from $ Ce^{3+}$ to $Tb^{3+}$ and $Mn^{2+}$ in $Sr_{3}Al_{10}SiO_{20}$

Nag, Abanti and Kutty, TRN (2005) Photoluminescence due to efficient energy transfer from $ Ce^{3+}$ to $Tb^{3+}$ and $Mn^{2+}$ in $Sr_{3}Al_{10}SiO_{20}$. In: Materials Chemistry and Physics, 91 (2-3). pp. 524-531.

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$Sr_{3}Al_{10}SiO_{20}$, doped with $Ce^{3+}, Tb^{3+}, Eu^{2+}$, $(Ce^{3+} + Tb^{3+})$, $(Ce^{3+} + Mn^{2+})$, $(Eu^{ 2+} + Tb^{3+})$ and $(Eu^{2+} + Mn^{2+})$ are prepared by wet-chemical route and energy transfer from $Ce^{3+}$ to $Tb^{3+}$ or $Mn^{2+}$ are investigated. The spectrum of $Ce^{3+}$ to $Tb^{3+}$ and $Mn^{2+}:Ce^{3+}$ shows single emission band at blue "violet region indicating the weak spin-orbit coupling of the ground state of $Ce^{3+}. Tb^{3+}$ doped $Sr_{3}Al_{10}SiO_{20}$ yields both the blue emission $^{5}D_{3}"^{7}F_{J}$ (J = 3, 4, 5, 6) and green emission $^{5}D_{3}^{7}F_{J}$ (J = 3, 4, 5, 6) of $Tb^{3+}$. However, the relative intensity of $^{5}D_{3}^{7}F_{J}$ transitions increases with concentration due to cross-relaxation between two interacting $Tb^{3+}$ centers. The green emission of $Tb^{3+}$ is remarkably enhanced due to energy transfer from $Ce^{3+}$ to $Tb^{3+}$ when present together in $Sr_{3}Al_{10}SiO_{20}$. The energy transfer phenomenon is also observed for $Ce^{3+}$ and $Mn^{2+}$ co-doped $Sr_{3}Al_{10}SiO_{20}$ indicating that $Ce^{3+}$ ion acts as a sensitizer in $Sr_{3}Al_{10}SiO_{20}$ independent of the activator. $Sr_{3}Al_{10}SiO_{20}:Eu^{2+}$ shows broad emission band with the maximum in the green region. However, $Eu^{2+}$ does not act as a sensitizer of luminescence when co-doped with $Tb^{3+}$ or $Mn^{2+}$. This might be because of the existence of $Eu^{2+}$ emission level at lower energy than the absorption energy level of $Tb^{3+}$ as well as $Mn^{2+}$ which does not allow the spectral overlap between the emission spectra of Eu2+ and the absorption spectra of $Mn^{2+}$ or $Tb^{3+}$ to induce sensitized luminescence.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Inorganic compounds;Precipitation;Photoluminescence spectroscopy;Luminescence
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 14 Dec 2005
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ernet.in/id/eprint/4511

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