Fabrication of Red and Yellow OLEDs with Using Single Furnace Method

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

Abstract

Red and yellow organic light-emitting diodes (OLEDs) with using a single furnace method have been fabricated and investigated. The current-voltage, electroluminescence, ­luminescence-current, and CIE characteristics of dopants coumarin 6­, Nile Red and 3, 4 TPP as well as co-doping of three dopants in Alq3 were measured. Red emission with doping of [Nile Red], [C-6: ­Nile Red] and yellow emission with doping of [­3, ­4 TPP] and [C-6:­3, ­4 TPP] in Alq3 were achieved. The co-doping of dopants of [C-6: Nile Red] and [C-6:­3, 4 TPP] in Alq3 decreased the bias and turn on voltage­ compared to pure [Nile Red] and [3, ­4 TPP] in Alq3 devices for the same current density. The highest EL efficiency was found for a [C-6: Nile Red (1:0.5)] and [C-6:­3, ­4 TPP (1:0.5)]. Results of this work indicate that the performance of red and yellow OLEDs fabricated with a single furnace is a promising candidate for fabrication of low-cost yellow and red OLEDs at more homogeneous layer instead of employing of two and three furnaces.

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