Effect of replacement of Ca by Ln (Ln = Y, Gd) on the structural and luminescence properties of CaWO{sub 4}:Eu{sup 3+} red phosphors prepared via co-precipitation
- Department of Materials Science and Engineering, Chengdu University of Technology, Chengdu 610059 (China)
- Department of Information and Management Science, Chengdu University of Technology, Chengdu 610059 (China)
Highlights: ► Y and Gd replace Ca ions in CaWO{sub 4}:Eu{sup 3+} structure as Ca{sub 1−x}Ln{sub x}WO{sub 4}:Eu{sup 3+}. ► Ca{sub 1−x}Ln{sub x}WO{sub 4}:Eu{sup 3+} phosphor is prepared by co-precipitation with NH{sub 4}HCO{sub 3}–NH{sub 3}·H{sub 2}O. ► {sup 5}D{sub 0}–{sup 7}F{sub 1–3} transitions of Eu{sup 3+} ions shows a red emission at about 614 nm. ► With Y and Gd added in host, the luminescent intensity is obviously improved. -- Abstract: Eu{sup 3+}-doped calcium based tungstate, Ca{sub 1−x}Ln{sub x}WO{sub 4}:Eu{sup 3+} (Ln = Y, Gd) red-emitting phosphors were prepared by co-precipitation method with NH{sub 4}HCO{sub 3}–NH{sub 3}·H{sub 2}O system as the precipitating aid agent. X-ray diffraction results reveal that the synthesized Ca{sub 1−x}Ln{sub x}WO{sub 4}:Eu{sup 3+} have scheelite structure with pure phase. Infrared spectra show strong absorption peaks between 803 and 440 cm{sup −1} which are assigned to the vibration of O–W in WO{sub 4}{sup 2−} tetrahedron. The Energy Disperse Spectroscopy analysis reveals that the red phosphors have been successfully prepared by co-precipitation method according to theoretic ratio. Due to the {sup 5}D{sub 0}–{sup 7}F{sub 1–3} transitions of Eu{sup 3+} ions, photoluminescence spectra show a red emission at about 614 nm under excitation of 395 nm (commercial ultraviolet) and 465 nm (blue chip). With Ln lanthanide added in host, the luminescent intensity of Ca{sub 1−x}Ln{sub x}WO{sub 4}:Eu{sup 3+} (x = 0.4, 0.5) is obviously improved comparing with that of CaWO{sub 4}:Eu{sup 3+} by several times.
- OSTI ID:
- 22215588
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and characterization of monodisperse spherical SiO{sub 2}-RE{sub 2}O{sub 3} (RE=rare earth elements) and SiO{sub 2}-Gd{sub 2}O{sub 3}:Ln{sup 3+} (Ln=Eu, Tb, Dy, Sm, Er, Ho) particles with core-shell structure
Enhanced luminescence intensity and color purity of the red emitting LnVO{sub 4}:Eu{sup 3+}@ SiO{sub 2} (Ln = Gd, Y and Gd/Y) powder phosphors