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White Luminescence of Dy3+ Ions Doped 12CaO·7Al2O3 Nanopowders Under UV Light Excitation

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Abstract:

12CaO·7Al2O3:Dy3+ nanopowders were successfully synthesized by the chemical co-precipitation method. X-ray diffraction result shows that the single 12CaO·7Al2O3 phase is formed with Dy3+ ions to replace the Ca2+ ions in the host of 12CaO·7Al2O3. The yellow and blue emissions, attributed to the forced electric dipole transition of 4F9/26H13/2 centered at 571 nm and the magnetic dipole transition of 4F9/26H15/2 centered at 480 nm, respectively, were observed. The integrated intensity ratios of yellow to blue increase from 1.63 to 1.70 with Dy3+ concentration increasing from 0.8 to 2.0% for the as-prepared 12CaO·7Al2O3:xDy3+ phosphor. The significantly enhanced emission intensities of 12CaO·7Al2O3:1.0% Dy3+ phosphor annealed at 900 °C for 2 hours in vacuum ambient could be ascribed to the decrease of OH groups and the change of the surface topography. The thermal stability and the Commission International de I'Eclairage coordinates were also investigated. All the photoluminescence characteristics indicate that Dy3+ ions doped 12CaO·7Al2O3 may be a good candidate for the solid state lighting phosphor as well as white light-emitting diodes.

Keywords: 12CAO.7AL2O3; DY3+; LEDS; PHOTOLUMINESCENCE

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2011.5291

Publication date: 2011-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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