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Luminescence Properties of Europium-Doped Yttrium Oxides Derived from Their Dodecylsulfate-Templated Mesostructure and Nanotube Forms

Published online by Cambridge University Press:  10 February 2011

Tsuyoshi Kijima ,
Kenichi Iwanaga ,
Tomomi Hamasuna ,
Shinji Mohri ,
Mitsunori Yada ,
Masami Sekita  and
Masato Machida
Tsuyoshi Kijima
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki, Japan
Kenichi Iwanaga
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki, Japan
Tomomi Hamasuna
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki, Japan
Shinji Mohri
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki, Japan
Mitsunori Yada
Affiliation:
Department of Chemistry &, Applied Chemistry, Faculty of Science & Engineering, Saga University; Saga, Japan
Masami Sekita
Affiliation:
National Institute for Materials Science, Tsukuba, Japan
Masato Machida
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki, Japan
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Abstract

Europium-doped hexagonal-mesostructured and nanotubular yttrium oxides templated by dodecylsulfate species as well as surfactant free bulk oxides were synthesized by the homogeneous precipitation method. All the as grown nanostructured or bulk materials with amorphous or poorly crystalline frameworks showed weak luminescence bands at room temperature. On calcination at 1000°C these materials were converted into highly crystalline yttrium oxides, resulting in a total increase in intensity of all the bands by one order of magnitude. In the hexagonal-mesostructured system, the main band due to the 5D0-7F2 transition for the calcined phases showed a sharp but asymmetrical multiplet splitting indicating multiple Eu sites. Concentration quenching was found at a Eu content of 3 mol% or above for these phases. In contrast, the main emission for the calcined solids in the nanotubular system occurred as poorly resolved broad band and the intensity of the main band at higher Eu content was significantly enhanced compared with those for the other two systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P3.2
Copyright
Copyright © Materials Research Society 2003

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