Our experiments reveal that the coherent excitonic states of MOBPcxH2OBPc1-x and H2OBNcxH2OBPc1-x crystalline thin films can be tuned continuously as a function of alloy concentration (0 < x < 1). Moreover, the solution-processed technique used to fabricate these crystalline thin films provides us an unprecedented advantage in designing and controlling the bandgap tunability as well as achieving the desired exciton coherent length for variety of applications.
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