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Photoluminescence Response of HfO2:Eu3+Obtained by Hydrothermal Route

Open Journal of Synthesis Theory and Applications 2013年第2期2卷 73-77页

作者： Elizabeth Navarro Cerón Geonel Rodríguez Gattorno Jose Guzmán-Mendoza Manuel García-Hipólito ciro falcony Centro de Investigación de Ciencia Aplicada y Tecnología Avanzada Instituto Politécnico Nacional México D. F. México Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional México D. F. México Departamento de Física Aplicada Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Mérida México Instituto de Investigaciones en Materiales Universidad Nacional Autónoma de México México D. F. México

In this work, the synthesis and photoluminescence response of HfO2 doped with Eu3+ (HfO2:Eu3+) are reported. The synthesis was carried out by the hydrothermal route of HfCl4 and EuCl3?.6H2O with NH4OH dissolved in deionized water. To perform the hydrolysis, the precursors were subjected to hydrothermal treatment at 120°C, under autogenously pressure at reaction times of 24, 40, 52 and 72 hours. The synthesized nanoparticles were characterized by mean of X- ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), and energy dispersive spectroscopy (EDS). Samples excited with 395 nm radiation show photoluminescence emission lines corresponding to the electronic transitions 5D0 → 7FJ (J = 0 → 4), characteristics of the Eu3+ ion. The photoluminescence emission intensity increases with the increasing of the reaction time, reaching a maximum at 72 hours. The excitation band peaked at 395 nm, makes this material an excellent candidate for applications in solid state white lamps.

关键词： Photoluminescence Hafnium Oxide Hydrothermal Method Earth Rare Trivalent Ions

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Luminescence Characteristics of LaAlO3:Eu3+Obtained by Modified Pechini’s Method

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Open Journal of Synthesis Theory and Applications 2017年第1期6卷 1-12页

作者： Alfredo Morales Hernández Mayra A. de León Alfaro Antonio Barrera Villatoro ciro falcony Teodoro Rivera Montalvo Juan Zarate Medina Instituto de Investigaciones en Metalurgia y Materiales Universidad Michoacana de San Nicolás de Hidalgo Morelia México Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Ciudad de México México Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Ciudad de México México

The aim of the present work was to investigate the luminescent properties of europium-doped lanthanum aluminate (LaAlO3) powder prepared by Modified Pechini (MP) method. Samples were prepared at different Eu3+ concentrations and calcined at 1600°C. Structural and morphology characterizations were obtained by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). Luminescent properties were analyzed by photoluminescence (PL) and thermoluminescent phenomena. The XRD pattern shows pure lanthanum aluminate oxide LaAlO3 with a rhombohedral structure. Photoluminescence studies of the powders was related to 4f → 4f(5D0 → 7Fi) (i = 1, 2, 3, 4) transitions of Eu3+ ion, the most intense emission of Eu3+ in LaAlO3 was registered for the transition 5D0 → 7F1, for 5% of Eu3+. The recorded TL glow curves of excited samples showed a main TL peak, the main peak appeared its maximum as a function of excitation energy. The investigation demonstrates that polycrystalline LaAlO3:Eu3+ powders calcined at 1600°C have interesting luminescent characteristics.

关键词： Modified Pechini Method LaAlO3:Eu3+ Photoluminescence Thermoluminescence

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Phase Transition in Superconducting Thin Films of Tl System Employing a One-Zone Furnace and Deposited by Spray Pyrolysis

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Materials Sciences and Applications 2013年第11期4卷 739-745页

作者： Jorge Luis Rosas-Mendoza L. Perez-Arrieta Miguel Aguilar-Frutis ciro falcony R. Vázquez-Arreguín Alejandro Miguel Rosas-Mendoza Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Instituto Politécnico Nacional México D.F. México Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Instituto Politécnico Nacional México D.F. México Unidad Profesional Interdisciplinaria de Biotecnología Instituto Politécnico Nacional México D.F. México Departamento de Física Centro de Investigación de Estudios Avanzados (CINVESTAV-IPN) México D.F. México Unidad Académica de Física Universidad Autónoma de Zacatecas (UAZ) Zacatecas México

A study of the phase transitions in superconducting thin films of the Thallium-Barium-Calcium-Copper (TBCCO) system is carried out. In particular, it was got the Tl-1223 phase. For this purpose, and using the ultrasonic spray pyrolysis technique, Barium-Calcium-Copper precursor films were first obtained. Upon deposition of the precursor films, and as a second step, they were thallium (Tl) diffused in the one-zone furnace at 860°C. This methodology resulted in superconducting films that showed a phase transition as follows: Tl-2223 → Tl-2223 + Tl-2212 → Tl-2212 → Tl-1223, achieved between 2 and 7 hours of thallium diffusion. The evidence of the phase transitions was corroborated by the experimental results of X-ray diffraction, energy dispersive spectroscopy and resistance-temperature measurements.

关键词： Superconductors Thin Films Ultrasonic Spray Pyrolysis

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Structural and Optical Characterization of Indium Zinc Oxynitride Thin Films

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材料科学与工程（中英文A版） 2014年第3期4卷 91-98页

作者： Jose Juan Ortega Sigala Maria Leticia Perez Arrieta Hugo TototzintleHuitle Miguel Angel Aguilar Frutis ciro falcony Victor Hugo Mendez Garcia Jose de Jesus Araiza Ibarra Academic Unit of Physics UAZ Zacatecas C.P. 98060 Me~xico CIACyT UASLP San Luis Potosl C.P. 78210 Mexico CICATA 1PN Mexico D.F. C.P. 11500 Mexieo Department of Physics CINVESTA V IPN Mexico D.F. C.P. 07360 Mexico

Indium zinc oxynitride (IZON) thin films were deposited on Si(100) substrates by RF reactive magnetron sputtering at different substrate temperature to study their structural and optical properties. All the films were deposited in a reactive atmosphere of nitrogen and argon. As precursor material, an IZO target (In 2 O 3 -ZnO, 90-10 wt%) with a purity of 99.99% was used. The crystalline structure of the films was analyzed by X-Ray diffraction technique (XRD), the deposited IZON thin films were practically amorphous with some polycrystalline contents for the films deposited at 100 °C and 300 °C. The refractive index and the extinction coefficient had been obtained from Spectral Ellipsometry (SE) analyses using the Classical and Adachi models, both results were qualitatively and quantitatively approximate. These optical results were analyzed and used to propose roughness values of the films surface, through of an appropriate proposal of the structure of the films. The roughness values obtained from optical models were compared with the morphological results studied by Atomic Force Microscopy (AFM), and the roughness values, obtained by direct and indirect measure, were consistent between them. The incorporated nitrogen reduced the typical crystallization of IZO and favored the deposition of transparent thin films with very flat surfaces, these results shows that the IZON has an ideal amorphous material for applications as conductive oxynitride layers.

关键词：氧化锌薄膜氧氮化物晶体结构光学特性 Si(100) 椭圆偏振光谱法薄膜沉积反应磁控溅射

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