Jump to main content
Jump to site search

Issue 29, 2010
Previous Article Next Article

Nitridation from core-shell oxides for tunable luminescence of BaSi2O2N2 : Eu2 + LED phosphors

Author affiliations

Abstract

Rod-like, uniform, and poorly aggregated BaSi2O2N2 : Eu powders with tunable luminescence for white LEDs have been successfully synthesized by direct gas-reduction nitridation from the core-shell oxide (Ba,Eu)CO3@SiO2. Maximization of the contact surface between the reactants and minimization of diffusion distances improved the efficiency of the nitridation. Thus, the desired oxynitride phosphors were obtained at relatively low temperatures (around 1100–1200 °C). Under these conditions, the (Ba,Eu)CO3 cores melted into small seeds which decreased the particle size and promoted the oriented growth of BaSi2O2N2 : Eu. The nucleation and subsequent crystal growth in (Ba,Eu)CO3@SiO2 were further discussed in the samples with different Ba/Si ratios. By controlling the nitridation process, tunable luminescence was achieved in the range of 490–530 nm. The low sedimentation rate of the phosphors from this route shows additional advantages in the LED packaging.

Graphical abstract: Nitridation from core-shell oxides for tunable luminescence of BaSi2O2N2 : Eu2 + LED phosphors

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Jan 2010, accepted on 28 Apr 2010 and first published on 16 Jun 2010


Article type: Paper
DOI: 10.1039/C0JM00118J
Citation: J. Mater. Chem., 2010,20, 6050-6056
  •   Request permissions

    Nitridation from core-shell oxides for tunable luminescence of BaSi2O2N2 : Eu2 + LED phosphors

    Y. Gu, Q. Zhang, Y. Li and H. Wang, J. Mater. Chem., 2010, 20, 6050
    DOI: 10.1039/C0JM00118J

Search articles by author

Spotlight

Advertisements