Non-radiative deactivation pathways of subphthalocyanine and subnaphthalocyanine dyes and of their mixture

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 59; no. 12; pp. 2841 - 2854
• Main Authors: Wróbel, Danuta, Boguta, Andrzej, Mazurkiewicz, Piotr
• Format: Journal Article
• Language: English
• Published: England Elsevier B.V 01-10-2003
• Subjects: Carbocyanines - chemistry; Carbocyanines - metabolism; Charge recombination; Charge separation; Deactivation processes; Electrodes; Energy Transfer; Photoelectrochemical cell; Solar Energy; ISC, intersystem crossing; TD, thermal deactivation; Φ T , quantum yield of triplet state population; Deactivation processes; C, capacitance; ET, energy transfer; BsNc, boron subnaphthalocyanine; BsPc, boron subphthalocyanine; Charge separation; Charge recombination; Φ F , fluorescence quantum yield; E T , energy of triplet state; PAS, photoacoustic spectrum/signal; PEC, photoelectrochemical cell; IC, internal conversion; Photoelectrochemical cell; Pc, phthalocyanine; BPB, bromophenol blue; DMSO, dimethyl sulfoxide; E F , energy of fluorescence; LIOAS, laser induced optoacoustic spectroscopy; Energy transfer; σ, conductivity
• ISSN: 1386-1425
• DOI: 10.1016/S1386-1425(03)00083-0

Subphthalocyanine and subnaphthalocyanine dyes and their mixture were investigated by means of the spectroscopic and photoelectric methods. Absorption, fluorescence, steady-state and time-resolved photothermal measurements for the dyes and their mixture were done in order to get information about the radiative and non-radiative deactivation processes as competetive processes to charge separation. It was shown that energy transfer between the dyes improved the photocurrent generation in photoelectrochemical cells (PEC) based on In
2O
3 and SnO
2 as an electrode. The possible participation of the dye triplet states in non-radiative processes was discussed.