Abstract
B2O3 – phthalocyanine composites (B2O3@MPc) were synthesized at 410 °C by sintering boron trioxide doped with base metal-free phthalocyanine (H2Pc) and/or its complexes of Mg, Zn, Gd (Pc = C32H16N8, phthalocyanine ligand, M = metal ion). The glassy products were characterized by scanning electron microscopy (SEM, EDS) and diffuse reflectance spectroscopy (DRS) which confirmed the incorporation of the respective phthalocyanines into the amorphous borate matrix. FTIR results suggested a possible impact of the phthalocyanine dopants on the final solid structure of the glassy matrix. The UV-excited composites emitted a pronounced blue phosphorescence featured by a two-step quenching process and lifetimes of 28 and 670 ms. Optical stimulated luminescence (OSL) tests proved excellent luminescence properties revealed by the samples including H2Pc and GdPc2 dopants. Reversible photoconductivity of the composites was confirmed by impedance spectroscopy measurements at current frequencies of 103 and 102 Hz and UV irradiation. The best results exhibited B2O3@GdPc2 featuring an impedance modulus decrease of about 2 orders of magnitude at 102 Hz compared to the other composites.
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