NDLI: Enhanced photoluminescence in $CaMoO_{4}:Eu^{3+}$ by $Gd^{3+}$ co-doping

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rai, S. B. Singh, B. P. Singh, P. Ningthoujam, R. S. Parchur, A. K. Ansari, A. A.
Description	Author Affiliation: Singh BP ( Department of Physics, Indian Institute of Technology (BHU), Varanasi, 221005, India.)
Abstract	We have studied the luminescence property of $CaMoO_{4}:Eu^{3+}.$ The emission peaks at 590 $(^{5}D_{0}→^{7}F_{1})$ and 613 nm $(^{5}D_{0}→^{7}F_{2})$ for $Eu^{3+}$ are observed after excitation at 266 nm (i.e. Mo–O charge transfer band). The peak intensity of the latter dominates over the former indicating an asymmetric environment of $Eu^{3+}$ in $EuO_{8}$ polyhedron or parity mixing. Luminescence intensity increases significantly with co-doping of $Gd^{3+}.$ This is ascribed to energy transfer from $Mo–O/Gd^{3+}$ to $Eu^{3+}.$ Luminescence intensity increases with annealing up to 900 °C due to the extent of decrease of non-radiative rates. Very high asymmetric values $(A_{21})$ of 12–16 are found indicating a red emitter. As-prepared samples are dispersible in polar solvents like water, ethanol, methanol, dimethyl sulfoxide (DMSO) and ethylene glycol (EG); and among them, optimum luminescence is found in methanol. Polymer film shows red emission. The quantum yields of as-prepared 2 and 10 at% $Gd^{3+}$ co-doped $CaMoO_{4}:Eu^{3+}$ under 277 nm (UV excitation) are 21 and 80%, respectively.
ISSN	14779226
Issue Number	12
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-03-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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