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Precise control of the conjugation within their framework is pivotal for tuning electronic structures and optimizing catalytic performance, yet conventional approaches for linker extension face significant synthetic limitations. We report in this work a multicomponent reaction strategy that enables stepwise tuning of the conjugation of COFs through linkage conversion, where imine linkages are sequentially transformed into tetrahydrophenanthridine and further into phenanthridine units. The progressively extended conjugation results in a lower bandgap and reduced exciton binding energy, thereby promoting light harvesting and subsequent free charge carrier generation and utilization. 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