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Nanocrystalline Eu3+ Doped M3Al2O6 (M: Ba, Ca and Sr) Red Phosphors Prepared by Sucrose-PVA-Metal Ion Complex Route

Published online by Cambridge University Press:  01 February 2011

Alp Manavbasi ,
Palkin Zed  and
Jeffrey C. LaCombe
Alp Manavbasi
Affiliation:
[email protected], University of Nevada, Reno, Materials Engineering, 1664 N Virginia St, Reno, NV, 89557, United States, 775-682-6885
Palkin Zed
Affiliation:
[email protected], University of Nevada, Reno, Chem. & Met. Engineering, Reno, NV, 89557, United States
Jeffrey C. LaCombe
Affiliation:
[email protected], University of Nevada, Reno, Chem. & Met. Engineering, Reno, NV, 89557, United States
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Abstract

Nanocrystalline (<100 nm) red emitting Eu3+- doped M3Al2O6 (M = Ba, Ca and Sr) phosphors were prepared by an aqueous sucrose-PVA-metal ion complex route. The aqueous sucrose-PVA solution includes 20 mol% PVA, and the method is based on the dehydration of a transparent metal ion-sucrose-PVA solution to a highly viscous liquid and then precursor formation by heating at 250°C. The phase formation and the crystallite size measurements were made by x-ray diffraction techniques. Photon correlation analysis revealed that all synthesized phosphor particles range in size from 400 nm to a few microns. The photoluminescence (PL) and PL excitation characteristics have been investigated. All samples have broad CT bands centered at around 269 nm and only the Ca3Al2O6:Eu3+ exhibited the characteristic f-f transitions of Eu3+ ions mainly located at 396 and 465 nm in comparable levels with the CT band. The emission spectrum of Ca3Al2O6:Eu3+ is dominated by the red (5D0 ¡æ 7F2) transition band located at 614 nm, however the Eu3+ doped Sr3Al2O6 and Ba3Al2O6 phosphors have comparable emission intensity in the red (5D0 ¡æ 7F2 ) and orange (5D0 ¡æ 7F1 ) transition bands. The highest intensity of the red emission was obtained when the Ca3Al2O6:Eu3+ phosphor was excited at 396 nm.

Keywords

luminescenceoptical propertieschemical synthesis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1023: Symposium JJ – Functional Nanoscale Ceramics for Energy Systems , 2007 , 1023-JJ05-08
Copyright
Copyright © Materials Research Society 2007

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