Optical performance of efficient blue/near UV nitropyridine-conjugated anthracene (NAMA) based light emitting diode

• A novel light emitting material, NAMA, which contains anthracene as a main core unit and 3′,5′-diphenylphenyl group derivative as wings has been synthesized.
• NAMA exhibited promising high blue/near UV emission efficiency.
• This optimized device structure, is characterized by blue/near UV EL and a high current density with 7735 cd m−2 maximum brightness at approximately 10.4 V. Also the emitting color showed a blue/near UV emission (x, y) = (0.14, 0.10) at 277.1 mA cm−2 in CIE chromaticity coordinates with a long operational lifetime (180 h).
• We conclude that the blue/near UV emission is due to the intrinsic emission of NAMA's origin tile with a steady scaffold controlling the charge injection and transport properties.

9-[(5-nitropyridin-2-aminoethyl) iminiomethyl]-anthracene (NAMA) was synthesized for the first time from the reaction between 9-antracene carboxaldehyde and 2-(2-aminoethylamino)-5-nitropyridine under mild reaction conditions. The structure of the nitropyridine-conjugated anthracene (NAMA) was characterized using 1H-NMR, 13C-NMR and elemental analysis techniques. Furthermore, electroluminescent behavior of the NAMA was investigated by using a material based on polycyclic aromatic hydrocarbons (PAHs) in organic light-emitting diodes (OLEDs). It was observed that the NAMA exhibits blue/near UV emission at 410 nm with a high density signal. The optimized device structure, ITO/CuPc/α−NPD/NAMA/Alq3/LiF/Al is characterized by blue/near UV electroluminescence (EL) and a high current density with 7735 cd m−2 maximum brightness at approximately 10.4 V. The emitting color of the device showed the blue/near UV emission (x, y) = (0.14, 0.10) at 277.1 mA cm−2 in CIE (Commission Internationale de l’Eclairage) chromaticity coordinates with a long operational lifetime (180 h).

Figure optionsDownload as PowerPoint slide