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Violet–blue luminescence from hafnium oxide layers doped with CeCl 3 prepared by the spray pyrolysis process
Author(s) -
GarcíaHipólito M.,
Caldiño U.,
AlvarezFragoso O.,
AlvarezPérez M. A.,
MartínezMartínez R.,
Falcony C.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622341
Subject(s) - photoluminescence , materials science , luminescence , substrate (aquarium) , amorphous solid , monoclinic crystal system , analytical chemistry (journal) , doping , deposition (geology) , oxide , thin film , chemistry , crystallography , nanotechnology , metallurgy , crystal structure , optoelectronics , paleontology , oceanography , sediment , biology , geology , chromatography
HfO 2 :CeCl 3 coatings were deposited by the spray pyrolysis method employing hafnium dichloride oxide and CeCl 3 dissolved in deionized water (18 MΩ/cm). The room temperature photoluminescence characteristics of the HfO 2 :CeCl 3 films were studied as a function of the deposition parameters such as doping concentrations and substrate temperature. The presence of two different Ce 3+ centres in HfO 2 is detected from photoluminescence measurements. A reduction of the luminescence intensity is observed with an increase of both the CeCl 3 concentration and the deposition temperature. X‐ray diffraction measurements of these films showed that the crystalline structure depends on the substrate temperature. For substrate temperatures less than 350 °C the deposited films are almost amorphous, while substrate temperatures higher than 400 °C produce diffraction peaks corresponding to the monoclinic phase of HfO 2 . The chemical composition of the films as determined by energy dispersive spectroscopy is also reported. Furthermore, the surface morphology characteristics of the coatings, as a function of the deposition temperature, are also presented. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)