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Preparation and Luminescence Properties of Neodymium(III) Oxide Nanocrystals Dispersed in Sol-gel Titania/ (γ-glycidoxypropyl)Trimethoxysilane Composite Thin Films

Published online by Cambridge University Press:  31 January 2011

Wenxiu Que ,
X. Hu ,
L. H. Gan  and
G. Roshan Deen
Wenxiu Que*
Affiliation:
School of Materials Engineering, Nanyang Technological University, Singapore 639798
X. Hu
Affiliation:
School of Materials Engineering, Nanyang Technological University, Singapore 639798
L. H. Gan
Affiliation:
School of Science, Nanyang Technological University, Singapore 259735
G. Roshan Deen
Affiliation:
School of Science, Nanyang Technological University, Singapore 259735
*
a)Address all correspondence to this author. e-mail: ewxque@ntu.edu.sg
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Abstract

Neodymium(III) oxide nanocrystals prepared by an inverse microemulsion technique have been dispersed in sol-gel titania/(γ-glycidoxypropyl)trimethoxysilane composite thin films at low temperature. Transmission electron microscopy and x-ray diffraction were used to characterize the phosphor nanoparticles and show that the neodymium(III) oxide nanoparticles have a nanocrystal structure and the size of the nanoparticles is in the range from 5 to 60 nm. An intense up-conversion emission in violet (399 nm) color from neodymium(III) oxide nanocrystals upon excitation with a yellow light (577 nm) has been observed. Two ultraviolet emissions at 347 and 372 nm and a blue emission at 466 nm have also been observed, and those are assigned to electronic transitions appropriately. A relatively strong room-temperature photoluminescence emission at 1064 nm corresponding to the 4F3/2 → 4I11/12 transition of neodymium ion has been measured as a function of the heat treatment temperature. In addition to this emission, two other emissions at 890 and 1336 nm have also been observed. Especially, a clear shoulder peak at 1145 nm, which could probably be resulting from the host matrix, was observed in all measured samples, and this shoulder peak reached a maximum intensity after a heat treatment at 300 °C.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1399 - 1405
Copyright
Copyright © Materials Research Society 2002

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