Soret and Q-band absorption control for porphyrin based blue-selective organic photodiode.
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Porphyrin based optoelectronics have been investigated vigorously due to their unique optical properties such as bimodal absorption which consists of soret and Q-band. These exclusive optical properties can be tunned by modifying chemical structure with meso position of porphyrin core, so that enable variable absorption range. However, bimodal behavior of porphyrin derivatives limits their application to wavelength-selective devices due to obstruction of Q-band absorption. Here in, we introduced 9,9-dioctyl-9H-fluorene (FL) wing groups at the four meso positions of novel zinc porphyrin (PZn) core to enhance its blue range absorbance. As a result, fabricated PZn-FL based organic photodetector showed prominent blue-selective absorption with a FWHM of 75 nm in solid state. Furthermore, blue-selective specific detectivity of 1.05×1011 Jones was achieved.