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Near infrared organic light-emitting diodes based on acceptor-donor-acceptor (ADA) using novel conjugated isatin Schiff bases |
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| Authors: | Mohammad Taghi Sharbati Mohammad Navid Soltani Rad Somayeh Behrouz Farzin Emami |
| Institution: | a Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran b Department of Chemistry, Shiraz University of Technology, Shiraz 71555-313, Iran c Photonics Lab, Department of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran |
| Abstract: | Fabrications of a single layer organic light emitting diodes (OLEDs) based on two conjugated acceptor-donor-acceptor (ADA) isatin Schiff bases are described. The electroluminescent spectra of these materials range from 630 to 700 nm and their band gaps were measured between 1.97 and 1.77 eV. The measured maximum external quantum efficiencies (EQE) for fabricated OLEDs are 0.0515% and 0.054% for two acceptor-donor-acceptor chromophores. The Commission International De L’Eclairage (CIE) (1931) coordinates of these two compounds were attained and found to be (0.4077, 0.4128) and (0.4411, 0.4126) for two used acceptor-donor-acceptor chromophores. The measured I-V curves demonstrated the apparent diode behavior of two ADA chromophores. The turn-on voltages in these OLEDs are directly dependent on the thickness. These results have demonstrated that ADA isatin Schiff bases could be considered as promising electroluminescence-emitting materials for fabrication of OLEDs. |
| Keywords: | OLED Near infrared emission ADA Electroluminescence Isatin Schiff base |
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