Abstract
To achieve high efficiency solution processed red OLED, a series of new triphenylamine–functionalized dithienylbenzothiadiazoles, namely TB, T3TB and T4TB, as non-doped solution-processed hole-transporting red emitters were synthesized and characterized. Particularly, T3TB having five triphenylamine units substituted on the dithienylbenzothiadiazole core exhibited a good red emission with high Tg amorphous and good film-forming properties. A simple structured non-doped red OLED (ITO/PEDOT:PSS/T3TB(spin coating)/BCP/LiF–Al) with an efficiency (η) of 6.25cdA−1 at 4.1mAcm−2 (PE=5.17lmW−1), a low turn-on voltage (3.0V) and a pure red emission (λEL=656nm, CIE (x,y)=0.67,0.33) was attained.
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