Optical properties of organic semiconductors based on erbium phthalocyanine complexes in the mid- and near-infrared spectral regions

摘要

The transmittance spectra of erbium phthalocyanine complexes in the mid- and near-infrared wavelength regions are studied. A detailed identification of the transmittance lines is presented for three types of phthalocyanine complexes. Data on the absorption of electromagnetic radiation at the wavelengths around 1.5 mu m due to the I-4(13/2) --> I-4(15/2) intracenter transitions between the levels of the erbium ions incorporated into the samples are obtained. It is found that some of the mid-infrared absorption lines shift when the number of organic ligands is increased by a factor of 2 or 3. It is shown that the absorption coefficient at the wavelengths around 1.5 mu m is equal to 27.5, 32.5, and 74 cm(-1) for erbium monophthalocyanine, bisphthalocyanine, and triphthalocyanine, respectively.