Structural Disorders in Gd2O2S:Tb Phosphors

  • V. Shanker
  • P. K. Ghosh
  • H. P. Narang
  • H. Chander
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 38)

Abstract

The luminescence characteristics of Gd2O2S:Tb phosphors prepared under different conditions are described and the possibility of electroluminescence discussed. X-ray diffraction and cathodoluminescence results are used to optimise synthesis parameters. The analysis of diffraction data for reflection intensity distribution from different (hkl) plane shows the presence of a disordered crystal structure. Brightness of luminescence emission is found to depend upon the extent of this disorder. The green cathodoluminescence is primarily due to the characteristic line emission 5D4-7F4 of Tb3+ in the spectral region of 540 nm. Under ac field excitation, the voltage dependence of electroluminescnece (EL) brightness follows the Destriau relation, B = B0 exp (-b/Vl/2).

Keywords

Epoxy Hexagonal Fluor Yttrium Kano 

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • V. Shanker
    • 1
  • P. K. Ghosh
    • 1
  • H. P. Narang
    • 1
  • H. Chander
    • 1
  1. 1.Division of MaterialsNational Physical LaboratoryNew DelhiIndia

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