Color Tuning and Investigation of Mobility in Organic Light Emitting Diodes Based on Imidazoles Compounds

In this work, three imidazole compounds were synthesized as fluorescent materials for organic light-emitting diodes (OLEDs). In the step, single and multi-layers OLEDs using imidazole compounds have been fabricated.  The highest luminous efficiency was observed with the compound (1). Diode fabricated with thiophene increased efficiency with respect to other compounds. Also, in the electroluminescence spectrum of the phenyl ring, electroplex emission was achieved. The results show that the color of devices depends on functional groups. The effect of various thicknesses (90,100 and 150 nm) on the electron mobility of devices with space-charge-limited current (SCLC) method was investigated. The highest mobility at the optimum thickness of 90 nm was achieved.