Efficient blue light emitting diode by using anthracene derivative with 3,5-diphenylphenyl wings at 9-and 10-position

Abstract

The novel blue light emitting material, 9,10-bis(3',5'-diphenylphenyl)anthracene (BDA) was synthesized by Suzuki coupling reaction and characterized by the measurements of H-1 NMR, C-13 NMR and FT-IR. The new anthracene derivative, which contains anthracene as a main core unit and 3',5'-diphenylphenyl group derivative as wings, has high fluorescence yield, good thermal stability, and high glass transition temperature at 188 degrees C. With the newly non-doped blue emitting material in the multilayer device structure, it was possible to achieve the current efficiency of 3.0 cd/A. The EL spectrum of the ITO/CuPc/alpha-NPD/BDA/Alq(3)/LiF/Al device showed a maximum wavelength (lambda(max)) at 440 nm. The emitting color of device showed the blue emission (x,y) = (0. 18, 0. 19) at 10 mA/cm(2) in CIE (Commission Internationale de I'Eclairage) chromaticity coordinates.