Skip to main content
    • Aa
    • Aa

PL due to Discrete Gap Levels in Some Chalcogenide Glasses- A Configurational Coordinate Diagram Illustration

  • N. Asha Bhat (a1), K.S. Sangunni (a1) and K.S.R.K. Rao (a1)
  • DOI:
  • Published online: 01 March 2011

Photoluminescence (PL) studies were carried out on a-Se and a few Ge20Se80−xBix and Ge20Se70−xBixTe10 bulk glassy semiconductors at 4.2 K with Ar+ laser as excitation source. While a-Se and samples with lesser at% of Bi show fine structured PL with a large Stokes shift, samples with higher at% of Bi did not show any detectable PL. The investigations show at least three radiative recombination transitions. Features extracted by deconvoluting the experimental spectra show that the discrete gap levels associated with the inherent coordination defects are involved in the PL transitions. Absence of PL in samples with higher Bi at% are explained on the basis of nonradiative transition mechanisms. Overall PL mechanism involving gap levels in chalcogenide glasses is illustrated with the help of a configurational coordinate diagram.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1.J. Rowlands and S. Kasap , Physics today 50 24 (1997).

2.S. Ramachandran and S.G. Bishop , Appl. Phys. Lett. 73 3196 (1998).

3.N. Tohge , T. Minami , Y. Yamamoto and M. Tanaka , J. Appl. Phys. 51 1048 (1980).

6.S.R. Elliot and A.T. Steel , J. Phys. CL Solid State Phys. 20 4335 (1987).

7.N. Asha Bhat and K.S. Sangunni , Solid State Commun. 116 (2000) 297.

8.R.A. Stret , Adv. Phys., 25 395 (1976) and references therein.

9.R. A. Street and N.F. Mott , Phys.Rev. Lett. 35 1293 (1975).

10.M. Kastner , D. Adler and H. Fritzche , Phys. Rev. Lett. 37 1504 (1976).

11.G. Blasse and B.C. Grabmaier , Luminescent Materials, (Springer Verlag, 1994).

12.E.A. Davis , Topics in applied Phys: Amorphous Semiconductors, (Springer Verlag, Berlin, 1979) p 41.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *