Optical Properties of Lutetium Diphthalocyanine Complex with Silicon Carbide Nanoparticles
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cal Properties of Lutetium Diphthalocyanine Complex with Silicon Carbide Nanoparticles S. I. Rasmagin* Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] Received December 4, 2019; revised March 12, 2020; accepted April 2, 2020
Abstract—We have prepared solutions of lutetium diphthalocyanine complexes containing different concentrations of silicon carbide nanoparticles. The silicon carbide nanoparticles were spherical or quasi-spherical in shape. The size of the silicon carbide nanoparticles has been determined to be 10 nm. The optical properties of the solutions were analyzed qualitatively and quantitatively. The results demonstrate that, with increasing lutetium diphthalocyanine concentration, absorption intensity in the spectrum of the silicon carbide increases. This can be accounted for in terms of additional absorption by the lutetium diphthalocyanine molecules because their absorption peak is close in energy to that of the silicon carbide nanoparticles. We have measured photoluminescence spectra of lutetium diphthalocyanine molecules and shown that their peak emission intensity increases by a factor of 1.2 under the effect of the silicon carbide nanoparticles. Keywords: phosphors, upconversion, erbium photoluminescence, ytterbium, semiconducting polymers DOI: 10.1134/S0020168520090149
INTRODUCTION In recent decades, the properties of rare-earth diphthalocyanines [1, 2] and inorganic semiconductor nanoparticles have been the subject of intense research owing to their unique optical, photoelectric, and electrical transport properties. Rare-earth diphthalocyanines find application in the fabrication of sensor devices. Silicon carbide nanoparticles have a wide range of practical applications: biosensors, ultraviolet and chemical sensors, radiation-resistant detectors and light emitting diodes, displays, etc. In particular, considerable research effort has focused on lutetium diphthalocyanine (LuPc2), which has interesting properties [6], and silicon carbide nanoparticles (n-SiC), which exhibit quantum size and quantum spin effects [7, 8]. Together with a redox pair of iodine ions (I− I3− ) , a solution of lutetium diphthalocyanine molecules can serve as a sensitized dye of Grätzel cells. To verify the feasibility of raising the voltage of Grätzel cells, silicon carbide nanoparticles were added to a lutetium diphthalocyanine solution. The result was a LuPc2–n-SiC complex solution for use in Grätzel cells. The objectives of this work were to prepare a LuPc2–n-SiC complex and investigate the mutual effect of lutetium diphthalocyanine and silicon carbide nanoparticles on their optical properties.
EXPERIMENTAL Silicon carbide nanoparticles (n-SiC) were prepared by laser-induced pyrolysis via mixing of monosilane (SiH4) and acetylene (C2H2) gases at 1500°C. The size and shape of the silicon carbide nanoparticles were assessed by scanning electron microscopy (SEM). Lutetium diphthalocyanines (LuPc2) were prepared by a template method via melting of lutet
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