Enhanced cathodoluminescence from an amorphous aln:holmium phosphor by co-doped gd+3 for optical devices applications

Academic Article

Abstract

  • Sputter-deposited thin films of amorphous AlN:Ho (1 at. %) emits in the green (549 nm) region of the visible spectrum under electron excitation. The addition of Gd (1 at. %) in the film enhances the green emission linearly after thermal activation at 900 °C for 40 min in a nitrogen atmosphere. The luminescence enhancement saturates when the gadolinium concentration reaches four times the holmium concentration. The optical bandgap of amorphous AlN is about 210 nm, so that the film is transparent in the ultraviolet, allowing us to observe the ultraviolet emission at 313 nm from Gd. No significant quenching of the Gd emission is observed. Energy dispersive x-ray (EDX) spectra confirm the increasing concentration of Gd. X-ray diffraction (XRD) analysis shows no peaks other than those arising from the Si (111) substrate, confirming that the films are amorphous. The enhanced luminescence can be used to make high-efficiency optical devices. © 2009 Optical Society of America.
  • Digital Object Identifier (doi)

    Author List

  • Maqbool M; Kordesch ME; Kayani A
  • Start Page

  • 998
  • End Page

  • 1001
  • Volume

  • 26
  • Issue

  • 5