Unusual White Electroluminescence of Organic Light Emitting Diodes Based on Imidazoles Compounds

Document Type : Original Article

Authors

1 Faculty of Industrial Technologies, Urmia University of Technology, Band Road, Urmia, Iran

2 Laser and Plasma Research Institute, Shahid Beheshti University, Tehran. Iran

3 Faculty of Chemistry, University of Tabriz, Tabriz, Iran

Abstract

In this work, imidazoles derivatives as luminescent materials have been investigated. In continuation, light-emitting diodes (OLEDs) were prepared using these compounds in a guest environment containing PVK as a hole transport material and PBD as an electron transport material. A device with the structure of ITO/PEDOT:PSS (60 nm)/PVK:PBD:‌‌ Guest (80 nm)/Al (180 nm) was fabricated. The electroluminescence spectrum of device red-shifted respect in PVK:PBD. The overlap between the absorption spectrum of the imidazoles and the emission spectrum of PVK:PBD caused a redshift. By variation of functional groups on these compounds, a shift in wavelength toke placed in the electroluminescence spectrum. By mixing imidazoles derivatives, a white light-emitting devices was prepared. This happened due to the rare electroplex phenomena in the emitting layer.

Keywords

Main Subjects

References

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Journal of Color Science and Technology
Volume 14, Issue 3
December 2020
Pages 215-222

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