Hostname: page-component-76fb5796d-zzh7m Total loading time: 0 Render date: 2024-04-26T11:53:03.937Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermally Stimulated Luminescence of Naphthylsubstituted Benzidine Derivative and Tris-8-(Hydroxyquinoline) Aluminum With and Without Metal Layers

Published online by Cambridge University Press:  10 February 2011

E. W. Forsythe ,
D. C. Morton  and
Y. Gao
E. W. Forsythe
Affiliation:
Dept. Of Physics and Astronomy, University of Rochester, Rochester, NY 1462 7-0171
D. C. Morton
Affiliation:
Army Research Laboratories, Adelphi, MD 20783-1197
Y. Gao
Affiliation:
Dept. Of Physics and Astronomy, University of Rochester, Rochester, NY 1462 7-0171
Get access

Abstract

Multilayer organic light emitting devices based on tris-8-(hydroxyquinoline) aluminum (Alq3) and a naphthyl-substituted benzidine derivative (NPB) have demonstrated practical electroluminescence with a wide range of color. Trap states in these materials play an important role in the carrier transport as well as the light emission process. We report the first observation of thermally stimulated luminescence (TSL) from Alq3 and NPB. The TSL spectra from 8 K to 300 K were used to determine the trap states in Alq3 and NPB. The results for Alq3 show a significant trap distribution at 156 K, which corresponds to a mean trap depth ranging from 0.18 to 0.12 eV, whereas the trap states in NPB are centered from 0.15 eV to 0.01 eV. We have used TSL to study the trap state properties of thin metal layers in the Alq3 films. In addition, we report photoluminescence as a function of temperature for Alq3. TSL spectroscopy provides a technique to study the trap states in a specific layer of the device structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 753
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Tang, C.W. and VanSlyke, S.A., Appl. Phys. Lett. 51, p. 913 (1987)Google Scholar
2. Tang, C.W., VanSlyke, S.A., and Chen, C.H., J. Appl. Phys. 65, p. 3610 (1989)Google Scholar
3. Burroughs, J.H., Bradley, D.D.C., Brown, A.R., Marks, R.N., MacKay, K., Friend, R.H., Burns, P.L., and Holmes, A.B., Nature (London) 347, p. 539 (1990)Google Scholar
4. Hung, L.S., Tang, C.W., and Mason, M.G., Appl. Phys. Lett. 70, p. 152 (1997)Google Scholar
5. Burrows, P.E. and Forrest, S.R., Appl. Phys, Lett. 64, p. 2285 (1993)Google Scholar
6. Burrows, P.E., Shen, Z., Sulovic, V., McCarty, D.M., Forrest, S.R., Cronin, J.A., and Thompson, M.E., J.Appl. Phys. 79, p. 7991 (1996)Google Scholar
7. So, F., Xu, J.-H., Kim, M., Lee, H.C., and Shen, J., Int. Displays Res. Conf Proc., p. F–23 (1997)Google Scholar
8. Lampert, M.A., Phys. Rev. 103, p. 1648 (1956)Google Scholar
9. Rose, A., Phys. Rev. 97, p. 1538 (1955)Google Scholar
10. Ostapenko, N.I. and Shpak, M.T., Opt. Spectrosc. (USSR) 68, p. 511 (1990)Google Scholar
11. Cooke, D.W., Bennett, B.L., Hults, W.L., Muenchausen, R.E., and Smith, J.L., Appl. Phys. Lett. 70, p. 3594 (1997)Google Scholar
12. Randell, J.T. and Wilkins, M.H.F., Proc. Roy. Soc. A184, p. 347 (1945)Google Scholar
13. Chen, R., J. Electrochem. Soc. 116, p. 1254 (1969)Google Scholar
14. Chen, R. and Kirsh, Y., Analysis of Thermally Stimulated Processes (Pergamon, Oxford, 1981) pp. 159–165 Google Scholar
15. Nicholas, K.H. and Woods, J., Br. J. Appl. Phys., 15, p. 783 (1964)Google Scholar
16. Silinsh, E.A., Phys. Stat. Sol. 3, p. 817 (1970)Google Scholar
17. Batley, M. and Lyons, L.E., Austral. J. Chem. 19, p. 345 (1966)Google Scholar
18. Baessler, H., Herrmann, G., Riehl, N., and Vaubel, G., J. Phys. Chem. Solids 30, p. 1579 (1969)Google Scholar