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Preparation of rare earth (europium(...
~
Corral, Jessica Olga.
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Preparation of rare earth (europium(3+), terbium(3+), thulium(3+), and ytterbium(3+)) doped yttrium oxide luminescent ceramics by the use of reverse micelles.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Preparation of rare earth (europium(3+), terbium(3+), thulium(3+), and ytterbium(3+)) doped yttrium oxide luminescent ceramics by the use of reverse micelles./
作者:
Corral, Jessica Olga.
面頁冊數:
73 p.
附註:
Adviser: Olivia A. Graeve.
Contained By:
Masters Abstracts International44-05.
標題:
Engineering, Metallurgy. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1434067
ISBN:
9780542617980
Preparation of rare earth (europium(3+), terbium(3+), thulium(3+), and ytterbium(3+)) doped yttrium oxide luminescent ceramics by the use of reverse micelles.
Corral, Jessica Olga.
Preparation of rare earth (europium(3+), terbium(3+), thulium(3+), and ytterbium(3+)) doped yttrium oxide luminescent ceramics by the use of reverse micelles.
- 73 p.
Adviser: Olivia A. Graeve.
Thesis (M.S.)--University of Nevada, Reno, 2005.
Nanophosphors of Y2O3:Eu, Y2O3:Tb, and Y2O3:Tm,Yb were prepared by reverse microemulsions. The prepared nanophosphors were then characterized using a variety of techniques and annealed to obtain a particular phase and improve crystallinity. Monoclinic and cubic phases of Y2O3 were obtainable with crystallite sizes of 5 nm--50 nm, with the monoclinic phase present at the lower crystallite sizes. Defects such as chemical species were present in annealed samples, but in minute quantities. The red and green luminescence properties of nanocrystalline Y2O3:Eu and Y2O3:Tb were evaluated. The peak intensity of both nanophosphors increased as annealing temperature and time increased. Therefore, larger crystallite size and elimination of impurities produced a higher luminescence. This was not shown in the case of the blue Y2O3:Tm,Yb nanophosphors. In this case, as heat treatment temperature increased the luminescence decreased. This was attributed to a change in phase between the monoclinic phase and the cubic phase.
ISBN: 9780542617980Subjects--Topical Terms:
1023648
Engineering, Metallurgy.
Preparation of rare earth (europium(3+), terbium(3+), thulium(3+), and ytterbium(3+)) doped yttrium oxide luminescent ceramics by the use of reverse micelles.
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Nanophosphors of Y2O3:Eu, Y2O3:Tb, and Y2O3:Tm,Yb were prepared by reverse microemulsions. The prepared nanophosphors were then characterized using a variety of techniques and annealed to obtain a particular phase and improve crystallinity. Monoclinic and cubic phases of Y2O3 were obtainable with crystallite sizes of 5 nm--50 nm, with the monoclinic phase present at the lower crystallite sizes. Defects such as chemical species were present in annealed samples, but in minute quantities. The red and green luminescence properties of nanocrystalline Y2O3:Eu and Y2O3:Tb were evaluated. The peak intensity of both nanophosphors increased as annealing temperature and time increased. Therefore, larger crystallite size and elimination of impurities produced a higher luminescence. This was not shown in the case of the blue Y2O3:Tm,Yb nanophosphors. In this case, as heat treatment temperature increased the luminescence decreased. This was attributed to a change in phase between the monoclinic phase and the cubic phase.
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