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Rapid Synthesis And Photoluminescent Characterization Of MAl2O4: Eu2+, Dy3+ (M = Ca/Ca + Ba/Ca + Mg) blue Nanophosphors For White Lighting Display Applications

Rapid Synthesis And Photoluminescent Characterization Of MAl2O4: Eu2+, Dy3+  (M = Ca/Ca + Ba/Ca + Mg) blue Nanophosphors For White Lighting Display Applications

Devender Singh1*, 2, Vijeta Tanwar1, Anura P. Simantilke2, Bernabe Mari3,  Pratap S. Kadyan1 and Ishwar Singh1

1Department of Chemistry, Maharshi Dayanand University, Rohtak 124001, India

2Centro de Fisica, Universidade of Minho, Braga 4710057, Portugal

3Departament de Física Aplicada, Universitat Politècnica de València, València 46022, Spain

Adv. Mater. Lett., 2016, 7 (1), pp 47-53

DOI: 10.5185/amlett.2016.6103

Publication Date (Web): Dec 22, 2015

E-mail: devjakhar@gmail.com

Abstract


The persistent MAl2O4:Eu2+, Dy3+ (M may be Ca or Ca+Ba or Ca+Mg) blue light emitting nanophosphors were prepared by rapid facile gel combustion technique. For the syntheses of present series of phosphors, urea was used as an organic fuel and boric acid was used as a flux in presence of air. Photoluminescence properties were studied by excitation and emission spectra. The phosphors showed blue luminescence (λmax= 454-458nm) under the excitation of UV source, attributed to 4f65d1→4f7 transitions of the Eu(II) ion. The effect on photoluminescence intensity and decay time was also studied for varying metal ions in different ratio (Ca or Ca+Ba or Ca+Mg). The existence of divalent europium ions in the synthesized lattices was confirmed by the X-ray photoelectron spectroscopy. The crystal phase and size of the prepared materials were analyzed with X-ray diffraction patterns. The surface morphology of phosphors was studied with scanning electron microscopy and transmission electron microscopy techniques revealed the average size of the prepared materials between the 30-50 nm. The prepared nanophosphors had bright optoelectronic properties that could be efficiently applied in various solid state white light emitting display devices. 

Keywords

Persistent phosphor, divalent europium, aluminate, photoluminescence property, combustion technique.

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