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A study on varying the number of fluorene units in 2, 1, 3‐benzothiadiazole‐containing oligomers and the effect on OLED performance and stability

Von Wiley-VCH zur Verfügung gestellt

Solution-processing has the potential to reduce the cost and energy requirements in the fabrication of organic light-emitting diode (OLED) devices. In non-doped emissive layers, polymers are commonly used, yet these can suffer from batch-to-batch variation. Oligomers, which have precise molecular structures, avoid this problem but maintain the favourable film-forming properties that polymers possess. We present three benzothiadiazole-containing fluorene-based oligomers, BT-F3 2 , BT-F4 2 and BT-F5 2 , and their use as emissive layers in OLED devices. The materials show very high photoluminescence quantum yields, with BT-F4 2 exhibiting the highest PLQY of 0.96 in a thin film. Although there is little change in the electroluminescence spectra, the oligomer size influences the device performance. BT-F3 2 had an external quantum efficiency of 1.9% and high luminance whilst BT-F4 2 reached an external quantum efficiency of 2.3%. Furthermore, the stability of the OLED devices was evaluated and showed that the device lifetime decays with increasing length of the molecules.

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