Luminescence in a Ba(Ti,Zr)O 3 Films Deposited by Ultrasonic Spray Pyrolysis Method
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Luminescence in a Ba(Ti,Zr)O3 Films Deposited by Ultrasonic Spray Pyrolysis Method D. Y. Medina1*, R. T. Hernandez1, I. Hernandez1, S. Orozco2 1
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División de Ciencias Básicas e Ingeniería, UAM-A, Av. Sn Pablo 180, 02200 México D.F., México.
Depto. de Física, Facultad de Ciencias UNAM, Av. Universidad 3000, Col. Copilco el Bajo, México D.F., México. *
E-mail: [email protected]
ABSTRACT The Ba(Ti,Zr)O3 powders was synthesized for many methods because its properties as a piezoelectric, dielectric and ferroelectric material that insert it as an functional material, but there is little information in the studied of its optical properties. In this work Ba(Ti,Zr)O3 films were produced by ultrasonic spray pyrolysis method for optical applications. The precursors used were an barium acetyl-acetonate , titanium acetyl-acetonate , and zirconium acetyl-acetonate powders dissolved in a N-N, dimethylformamide solution. Optical and morphological properties of the films shown a non crystalline structure and its emission spectra shown a broad and intense luminescence at 468nm which correspond to visible emission in the green region. Keywords: amorphous, luminescence, film, photoemision, spray pyrolysis.
INTRODUCTION In the recent years several studies have reported room temperature visible photoluminescence (PL) in structurally disordered materials in the form of non crystalline films [1]. In other hand there are an increasing use for light-emitting devices for displays and communication, lightemitting diodes (LEDs) and many optical and electronic applications that generate an increasing demand of new photoluminiscent materials at low cost. The Ba(Ti,Zr)O3 is a perovskite material in crystalline structure and it has been synthesized for many methods. It has properties as a piezoelectric, dielectric and ferroelectric material. As a thin films are expected to be used in microelectronic devices [2-5]. That insert it as a functional material, but there is little information in the studied of its optical properties [6, 7]. Various methods for synthesis of luminescent powders and films have been employed [8-11]. The ultrasonic spray pyrolysis method is a well established process for depositing films. The main advantages of this technique are its low cost, a high deposition rate, the possibility to coat large areas, its ease of operation and the quality of the coatings obtained which can be easily scaled to industrial level [12-17]. In his work are presented the synthesis and characterizations of Ba(Ti,Zr)O3 films obtained with ultrasonic spray pyrolysis technique.
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EXPERIMENTAL PROCEDURE The films deposition procedure is similar to previously reported [1].The films were grown over glass slides of Corning 7059 type (commercial grade) like substrates. Were used as source materials acetylacetonates (Acac of Sigma Aldrich) of Ba, Ti and Zr dissolved in N,N,dimetylformamide (Dmf of Sigma Aldricht) to form the spraying solution with different concentrations. The substrates were placed on a hot plate at constant temperatur
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