Triphenylamine moieties substituted diketopyrrolopyrrole derivatives showed highly emissive characteristics in solid film state by aggregation induced emission.

Four novel asymmetric triphenylamine dyes configured with donor-donor-acceptor (D-D-A) and donor-donor-bridge-acceptor (D-D-p-A) structures were synthesized and applied to organic dye-sensitized solar cells. The terminal methoxy group in the donor part and the furane-bridge unit contributed to the wider absorption region and enhanced electron life time, resulting in a higher photocurrent density (J sc ), open-circuit voltage (V oc ), and overall conversion efficiency (Z). Among the synthesized dyes, the SK2-based DSSC showed the highest conversion efficiency of 5.57% (J sc = 10.41 mA cm À2 , V oc = 729 mV, and FF = 0.73) caused by the synergetic effect of the methoxy group and the furane-bridge unit.

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