Preparation and characterization of rare-earth-doped Y2O3 luminescent ceramics by the use of reverse micelles

✍ Scribed by Olivia A. Graeve; Jessica O. Corral

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 470 KB
• Volume: 29
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2006.03.013

✦ Synopsis

The objective of this project was to study luminescent powders of Y 2 O 3 :Eu 3+ (5 at%), Y 2 O 3 :Tb 3+ (5 at%), and Y 2 O 3 :Tm 3+ ,Yb 3+ (Tm: 2 at%, Yb: 1 at%), prepared by the use of reverse micelles. This report describes the phase stability, crystallite size, and luminescence properties of these powder materials as a function of heat treatment time and temperature. The Y 2 O 3 phase produced during synthesis can be controlled by the heat treatment temperature and time. Monoclinic and cubic phases of Y 2 O 3 are obtainable, with the monoclinic powders produced at the smaller crystallite sizes. Photoluminescence properties of the Y 2 O 3 :Eu 3+ and Y 2 O 3 :Tb 3+ were evaluated and sharp emission was observed for the Eu 3+ powders at 610 nm and the Tb 3+ powders at 544 nm. The maximum emission intensity of both phosphors increased as annealing temperature and time increased. This, however, was not seen for the case of the Y 2 O 3 :Tm 3+ ,Yb 3+ powders, which exhibited emission at 454 nm. For this phosphor, as heat treatment temperature increased the luminescence intensity decreased.