White Luminescence of Dy3+ Ions Doped 12CaO·7Al2O3 Nanopowders Under UV Light Excitation
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 4F9/2 → 6H13/2 centered at 571 nm and the magnetic dipole transition of 4F9/2 → 6H15/2 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.
Document Type: Research Article
Publication date: 2011-11-01
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