Optical and electroluminescent properties of imidazole based small molecules

Date

2024-6

Author

Demirgezer, Fatma Elif

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OLEDs are the trending topic in the lighting and display industry because of their properties, such as being flexible, highly bright, and thinner. In this thesis, the synthesis of imidazole-bearing small molecules with different substituents and their application to OLEDs were studied. Moreover, the effects of substituents in imidazole molecules on OLEDs were examined. In order to investigate the electronic properties CV studies were performed. Photoluminescence peaks were centered at 490, 492, 495, 488, 490, and 489 nm for 2-(4-(tert-butyl)phenyl)-4,5-diphenyl-1H imidazole (BIm-H-tBu), 2-(4-(tert-butyl)phenyl)-1-(4-chlorophenyl)-4,5-diphenyl 1H-imidazole (BIm-PhCl-tBu), 2-(4-(tert-butyl)phenyl)-1,4,5-triphenyl-1H imidazole (BIm-Ph-tBu), 2-(4-methoxyphenyl)-4,5-diphenyl-1H-imidazole (BIm- H-OMe), 2-(4-methoxyphenyl)-1,4,5-triphenyl-1H-imidazole (BIm-Ph-OMe), 1-(4-chlorophenyl)-2-(4-methoxyphenyl)-4,5-diphenyl-1H-imidazole (BIm-PhCl-OMe), respectively. Electroluminescent properties were investigated with the device architecture of ITO/ α-NPD/ Small Molecules/ TPBi/ LiF-Al with the incorporated OLED; the luminance value was exceeded of 10,000 cd.m-2, and current efficiency of 5.9 and 7.73 cd.A-1 were achieved. These results are promising for first-generation OLEDs.

Subject Keywords

Blue emitting materials, OLED, Imidazole core, Substituent effect, Color purity

URI

https://hdl.handle.net/11511/110143

Collections

Graduate School of Natural and Applied Sciences, Thesis