A facile and efficient strategy for the preparation of stable CaMoO 4 spherulites using ammonium molybdate as a molybdenum source and their excitation induced tunable luminescent properties for optical applications

G. Seeta Rama Raju, E. Pavitra, Yeong Hwan Ko, Jae Su Yu

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104 Scopus citations

Abstract

Stable CaMoO 4 spherulites were synthesized by a facile hydrothermal method using (NH 4) 6Mo 7O 24·4H 2O as a Mo source and these spherulites were formed according to the theoretical predictions of the crystal splitting theory. Rietveld refinement and photoluminescence studies confirmed that the CaMoO 4 spherulites are defect-free. The CaMoO 4 spherulites showed greenish-blue emission and the single emitting component of CaMoO 4:Eu 3+ spherulites led to a novel excitation induced efficient emission property like organic light emitting diodes. Cathodoluminescent properties of the CaMoO 4:Eu 3+ exhibited individual emissions from MoO 4 2- clusters and Eu 3+ ions. The white color emissions were clearly explained using Gaussian fitting curves. The corresponding CIE chromaticity coordinates provided their emission potentiality in the green, red and white regions for optical and biological applications.

Original languageEnglish
Pages (from-to)15562-15569
Number of pages8
JournalJournal of Materials Chemistry
Volume22
Issue number31
DOIs
StatePublished - 21 Aug 2012

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