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Singlet Exciton Quenching by Radical Cations of AromaticDiamines as an Electron Donor in Organic ElectroluminescentDevices

Published online by Cambridge University Press:  02 March 2011

Munkhbat Battulga ,
Gendensuren Bolormaa ,
Batjargal Naranbileg  and
Chimed Ganzorig
Munkhbat Battulga
Affiliation:
Center for Nanoscience and Nanotechnology and Department of Chemical Technology, School of Chemistry and Chemical Engineering, National University of Mongolia, Ulaanbaatar, Mongolia
Gendensuren Bolormaa
Affiliation:
Center for Nanoscience and Nanotechnology and Department of Chemical Technology, School of Chemistry and Chemical Engineering, National University of Mongolia, Ulaanbaatar, Mongolia
Batjargal Naranbileg
Affiliation:
Center for Nanoscience and Nanotechnology and Department of Chemical Technology, School of Chemistry and Chemical Engineering, National University of Mongolia, Ulaanbaatar, Mongolia
Chimed Ganzorig
Affiliation:
Center for Nanoscience and Nanotechnology and Department of Chemical Technology, School of Chemistry and Chemical Engineering, National University of Mongolia, Ulaanbaatar, Mongolia
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Abstract

In this study, we report the luminescence quenching by radical cations ofaromatic diamines used as a hole transport layer (HTL) in organicelectroluminescent (EL) devices. The EL characteristics of green organic ELdevices with an electron transport layer (ETL) as an emitter i.e. ITO/TPD HTL/Alq3 ETL/Al is studied. Here, ITO, TPD, and Alq3 are abbreviations for indium-tin-oxide,N,N’-diphenyl-N,N’-bis(3-methylphenyl)-1,1’-biphenyl-4,4’-diamine, and tris(8-hydroxyquinoline) aluminum, respectively. UV-visible absorption andelectrochemical data indicate the formation of radical cations in thin filmand solution of TPD after chemical oxidation. We find that the EL luminanceincreases less than linearly with an increase in current for the EL devicesstudied in this study. The luminance loss in the devices is attributed toquenching of singlet excited states by large excess radical cations of TPDare accumulated in the emission zone due to large overlap between aflourescence spectrum of Alq3 and an absorption spectrum ofradical cations of TPD.

Keywords

electronic structureluminescencesemiconducting

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e03-15
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

1. Pope, M., Kallmann, H. P., and Magnante, P., J. Chem. Phys. 38, 2042 (1963).Google Scholar
2. Helfrich, W. and Schneider, W. G., Phys. Rev. Lett. 14, 229 (1965).Google Scholar
3. Helfrich, W. and Schneider, W. G., J. Chem. Phys. 44, 2902 (1966).Google Scholar
4. Tang, W. and VanSlyke, S. A., Appl. Phys. Lett. 51, 913 (1987).Google Scholar
5. Fujihira, M. and Ganzorig, C., “Molecular Control of Electron and Hole Injection at Electrodes and at Organic Layer Interfaces in Organic Electroluminescent Devices” in Conjugated Polymer and Molecular Interfaces, edited by Kahn, A., Pireaux, J. J., Salaneck, W. R. and Seki, K., (Marcel Dekker, New York, 2002) pp. 817–858.Google Scholar
6. Ganzorig, C. and Fujihira, M., Appl. Phys. Lett. 81, 3137 (2002).Google Scholar
7. Ganzorig, C. and Fujihira, M., Mat. Res. Soc. Symp. Proc. 771, 105 (2003).Google Scholar
8. Fujihira, M. and Ganzorig, C., “Study of Hole Injection in Hole-Only Single-Layer Devices,” in Multifunctional Conducting Molecular Materials, edited by Saito, G., Wudl, F., Haddon, R. C., Tanigaki, K., Enoki, T., Katz, H. E., and Maesato, M. (RSC, Royal Society of Chemistry, Cambridge, 2007) pp. 253–269.Google Scholar
9. Ganzorig, C. and Fujihira, M., Appl. Phys. Lett. 77, 4211 (2000).Google Scholar
10. Ganzorig, C., Suga, K., and Fujihira, M., Chem. Lett. 29, 1032 (2000).Google Scholar