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Doctoral Thesis
DOI
10.11606/T.76.2006.tde-15092008-112434
Document
Author
Full name
Lauro June Queiroz Maia
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Mastelaro, Valmor Roberto (President)
Bernardez, Andrea Simone Stucchi de Camargo Alvarez
Fick, Jochen
Ibanez, Alain
Ribeiro, Sidney José Lima
Title in Portuguese
Síntese e caracterização de filmes finos do sistema Y2O3-Er2O3-Al2O3-B2O3 para aplicação como amplificadores ópticos planares.
Keywords in Portuguese
Alumínio-boratos
Filmes
finos
Guias de ondas
Método dos precursores poliméricos
Processo sol-gel
Propriedades estruturais
Propriedades Ópticas
Sistema Y2O3-Er2O3-Al2O3-B2
Abstract in Portuguese
Esse trabalho de tese descreve a síntese e a caracterização de materiais amorfos e cristalinos na forma de pó e de filmes finos pertencentes ao sistema Er2O3-Y2O3-Al2O3-B2O3. O principal objetivo do trabalho foi o de obter filmes finos amorfos contendo íons Er3+ próximo à composição YAI3(BO3)4 (YAB), visando sua aplicação como amplificador em dispositivos ópticos integrados. Na síntese das amostras foi empregado o método dos precursores poliméricos e o método sol-gel. Uma vez estabelecida às condições de síntese das resinas e de sóis estáveis, diferentes parâmetros foram otimizados visando à deposição de filmes relativamente espessos e amorfos. As propriedades térmicas, estruturais e ópticas de amostras cristalinas ou amorfas, na forma de pó e na forma de filmes finos, foram caracterizadas através das técnicas de análise termogravimétrica, calorimetria exploratória diferencial, difração de raios X, espectroscopia vibracional na região do infravermelho com transformada de Fourier, espectroscopia Raman e microscopia eletrônica de varredura de alta resolução, microscopia de força atômica, espectroscopia "m-line", medidas de espectros de luminescência. Baseado na análise térmica e estrutural das amostras na forma de pó, foi possível realizar a síntese de amostras na forma de filmes finos de composição Y1-xErxAl3(BO3)4 que apresentaram características estruturais, microestruturais e ópticas adequadas à aplicação desejada. Através do estudo das propriedades térmicas e estruturais, foi observado que as amostras preparadas através do método dos precursores poliméricos e do método sol-gel apresentam respectivamente uma temperatura de transição vítrea (Tg) à 723 °C e à 746 °C e uma temperatura de cristalização (Tc) à 814 °C e à 830°C. O tratamento térmico à aproximadamente 1150 °C da amostra amorfa na forma de pó de composição Y0,9Er0,1Al3(BO3)4 contendo boro em excesso levou a obtenção de uma solução sólida cristalina de composição Y0,9Er0,1Al3(BO3)4. No que se refere às propriedades dos filmes finos, as melhores condições de densificação, homogeneidade, eficiência de guiamento, emissão luminescente e tempo de vida foram observadas quando os filmes de composição Y0,9Er0,1Al3(BO3)4 foram tratados entre as temperaturas de Tg e Tc. Os filmes amorfos de composição Y0,9Er0,1Al3(BO3)4 se comportam como guias monomodos, apresentando alta emissão luminescente e um tempo de vida comparável a outros sistemas amorfos a base de boro. Esse comportamento mostra a viabilidade de aplicação desses filmes amorfos como amplificadores ópticos planares.
Title in English
Thin films preparation and characterization of the Y2O3-Er2O3-Al2O3-B2O3.
Keywords in English
Aluminoborates
Optical properties
Polymeric precursor method
Sol-gel process
Structural properties
Waveguide
Y2O3-Er2O3-Al2O3-B2O Th
Abstract in English
This work specifies the synthesis and the characterization of amorphous and crystalline powder and thin films materials belonging to the Er2O3-Y2O3-Al2O3-B2O3 system. The main objective of this work was to develop amorphous thin film samples near the YAI3(BO3)4 composition with yttrium partially substituted by erbium Y1-xErxAl3(BO3)4 with the aim of applying these thin films as waveguide amplifiers in integrated optical systems. The polymeric precursor and the sol-gel methods were applied in order to produce such thin films. After the first step where the conditions to obtain very stable resins and sols was established, different parameters were adjusted aiming the deposition of thick and stable thin films. To well define the best conditions to obtain amorphous and dense thin films, the powder samples of the same compositions were first characterized by thermal analysis techniques, X-ray diffraction, IR and Raman spectroscopies, high resolution electron microscopy and atomic force microscopy. From thermal analysis and structural results, it was observed that the samples prepared from the polymeric precursor and sol-gel methods exhibit glass transition temperatures, Tg, at 723 and 746 °C and cristallisation temperatures, Tc, at 814 and 830 °C, respectively. The heat treatment at around 1150 °C of Y0,9Er0,1Al3(BO3)44 powder sample containing a smaller amount of boron in excess produced by both methods lead to the formation of a crystalline solid solution of the same composition without the presence of secondary phases. These results show that dense, free of cracks, thick and homogeneous thin films could be obtained when they were submitted at a heat treatment in temperatures between Tg and Tc. From the "m-line" spectroscopy technique and luminescence measurements we observed that the Y0,9Er0,1Al3(BO3)4 amorphous thin films can be considered as monomode waveguides showing a high luminescence intensities and a lifetime similar to other amorphous borate systems. These results show the potentiality to apply such amorphous thin films as optical planar amplifiers.
 
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Publishing Date
2008-09-30
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • MAIA, L, and MASTELARO, VR. Er:YAl3(BO3)4 glassy thin films from polymeric precursor and sol-gel methods: Waveguides for integrated optics [doi:10.1016/j.tsf.2009.04.040]. Thin Solid Films [online], 2009, vol. 517, p. 6584-6587.
  • Maia, L. J. Q., et al. Optical properties of amorphous, erbium-doped yttrium alumino-borate thin films [doi:10.1016/j.optmat.2011.09.014]. Optical Materials (Amsterdam. Print) [online], 2012, vol. 1, p. 1-6.
  • MAIA, L. J., et al. Amorphous erbium doped borate thin films obtained by the polymeric precursor method and by sol-gel processing. Glass Science and Technology (Frankfurt) (Cessou em 2005. Fundiu-se com ISSN 0017-1050, 0031-9090, 1753-3546 e 1753-3562), 2006, vol. 47, p. 141-144.
  • Maia, L.J.Q., et al. Elaboration and optimization of (Y,Er)Al3(BO3)4 glassy planar waveguides through the sol gel process [doi:10.1016/j.optmat.2009.10.008]. Optical Materials (Amsterdam) [online], 2010, vol. 32, p. 484-490.
  • Maia, L.J.Q., et al. Synthesis optimization, structural evolution and optical properties of Y0.9Er0.1Al3(BO3)4 nanopowders obtained by soft chemistry methods [doi:10.1016/j.solidstatesciences.2008.03.031]. Solid State Sciences [online], 2008, vol. 10, p. 1835-1845.
  • Maia, Lauro J. Q., et al. Er:YAB nanoparticles and vitreous thin films by the polymeric precursor method [doi:10.1007/s11051-007-9349-9]. Journal of Nanoparticle Research [online], 2008, vol. 10, p. 1251-1262.
  • Maia, Lauro J.Q., et al. A sol gel route for the development of rare-earth aluminum borate nanopowders and transparent thin films [doi:10.1016/j.jssc.2006.11.016]. Journal of Solid State Chemistry [online], 2007, vol. 180, p. 611-618.
  • IBANEZ, A., et al. Erbium Doped aluminoborates thin films by the sol-gel process. In The 5th International Conference on Borate Glasses , Crystals and Melts, Trento, Italia, 2005. Book of abstracts of the 5th International Conference on Borate Glasses , Crystals and Melts., 2005. Abstract.
  • MAIA, L. J., et al. Amorphous erbium doped borate thin films obtained by the polymeric precursor method and by sol-gel processing. In 5th International Conference on Borate Glasses, Crystals and Melts, Trento, ITALY, JUL 10-14, 2005, 2005. Proceedings of the 5th International Conference on Borate Glasses, Crystals and Melts. : SOC GLASS TECHNOLOGY, UNIT 9, TWELVE O CLOCK COURT, 21 ATTERCLIFFE RD, SHEFFIELD S4 7WW, S YORKSHIRE, 2006.
  • FERREIRA, C. R., et al. Synthesis and thermal characterization of Er:YAB by the Pechini Method and Sol-Gel Process. In The 5th International Conference on Borate Glasses , Crystals and Melts, Trento, Italy, 2005. Book of abstracts of The 5th International Conference on Borate Glasses , Crystals and Melts., 2005. Abstract.
  • MAIA, L. J., et al. Y0.9Er0.1Al3(BO3)(4) thin films prepared by the polymeric precursor method for integrated optics [doi:10.1166/jnn.2007.811]. In ChemOnTubes International Conference, Arcachon, FRANCE,, 2006. Proceedings of the ChemOnTubes International Conference. : AMER SCIENTIFIC PUBLISHERS, 25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USA, 2007.
  • MAIA, Lauro June, et al. Amorphous Erbium-doped Borate Thin Films Obtained by polymeric precursor method. In 12th European Conference on Integrated Optics, Grenoble, 2005. Proceed. of the 12th European Conference on Integrated Optics., 2005. Abstract.
  • MAIA, Lauro June, et al. Incorporation of amorphous YAB nanoparticles in SiO2 Through sol-gel method: structural and luminescence. In IV International simposium on Non-Crystalline Solids, Aracaju, 2007. Abstracts of the IV International simposium on Non-Crystalline Solids., 2007. Resumo.
  • MAIA, Lauro June, et al. Propriedades Ópticas de Filmes Finos Alumino Boratos com Érbio Sintetizados pelo processo Sol-Gel. In XXIX Encontro Nacional de Física da Matéria Condensada, São Lorenço, 2006. Resumos do XXIX Encontro Nacional de Física da Matéria Condensada. : SBF, 2006. Resumo. Dispon?vel em: SBF.
  • MAIA, Lauro June, et al. Structural and optical properties of amorphous erbium-doped YAB thin films. In III International Symposium on Non-Crystalline Solids, VII Brazilian Symposium on Glass and related Materials, Foz Do Iguaçu, 2005. Proceedings of the III International Symposium on Non-Crystalline Solids, VII Brazilian Symposium on Glass and related Materials., 2005. Abstract.
  • SANTOS, C. C., et al. Synthesis and characterization of YAB glasses and thin films for optical applications. In Journees thematiques: spectroscopies infrarouges et Raman - Mesures in situ et rayonnement thermique, Chaumont sur Tharonne, 2006. Resumes de la Journees thematiques: spectroscopies infrarouges et Raman - Mesures in situ et rayonnement thermique.Chaumont sur Tharonne - France, 2006. Resumo.
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