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Herein, a small molecule 1\u2010phenyl\u20102\u2010(4\u2010(pyren\u20101\u2010yl)phenyl)\u20101<jats:italic>H<\/jats:italic>\u2010phenanthro[9,10\u2010<jats:italic>d<\/jats:italic>]imidazole (pPPI) is synthesized, and an organic synaptic device is investigated with bipolar resistive switching characteristics and bidirectional gradual conductance regulation for the first time. A facile solution\u2010processing approach can be used to deposit a uniform active layer on flexible substrates. Our pPPI\u2010based nonvolatile memory presents a superior electrical performance, such as relatively stable and reproducible bipolar resistive switching phenomena and a robust data retention capability. In particular, our device displays a remarkably large switching window of around 7.0\u2009\u00d7\u200910<jats:sup>7<\/jats:sup>, which is a record ON\/OFF ratio compared with other small molecule\u2010based memories up to now. 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