Photoluminescence of Y2O3:Eu3+ thin film phosphors by sol–gel deposition and rapid thermal annealing

• Published in: The Journal of physics and chemistry of solids 2005-01, Vol.66 (1), p.213-217
• Main Authors: Chong, M.K., Pita, K., Kam, C.H.
• Format: Article
• Language: English
• Subjects: A. Thin films; B. Sol–gel growth; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Luminescence; D. Optical properties; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Photoluminescence; Physics
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2004.09.016

Y2O3:Eu3+ phosphor films have been developed by using the sol–gel process. Comprehensive characterization methods such as Photoluminescent (PL) spectroscopy, X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy were used to characterize the Y2O3:Eu3+ phosphor films. In this experiment, the XRD profiles show that the Y2O3:Eu3+ phosphor films crystallization temperature and optimum annealing temperature occur at about 650 and 750°C, respectively. The optimum dopant concentration is 12mol% Eu3+ and the critical transfer distance (Rc) among Eu3+ ions is calculated to be about 0.84nm. Vacuum environment is more efficient than oxygen and nitrogen to eliminate the OH content and hence yields higher luminescent phosphor films. The PL emission intensity of Y2O3:Eu3+ phosphor films is also dependent on the annealing time. It was found that the H2O impurities were effectively eliminated after annealing time of 25s at 750°C in vacuum environment. From the experiment results, the schematic energy band diagram of Y2O3:Eu3+ phosphor films is constructed.