Fluorescence Behaviour and Singlet Oxygen Production of Aluminium Phthalocyanine in the Presence of Upconversion Nanoparticles.
NaYF4:Yb/Er/Gd upconversion nanoparticles (UCNP) were synthesised and the photoemission stabilised by embedding them in electrospun fibers. The photophysical behaviour of chloro aluminium tetrasulfo phthalocyanine (ClAlTSPc) was studied in the presence of UCNPs when the two are mixed in solution. The fluorescence quantum yield value of ClAlTSPc decreased in the presence of UCNPs due to the heavy atom effect of UCNPs. This effect also resulted in increase in triplet quantum yields for ClAlTSPc in the presence of UCNPs. The fluorescence lifetimes for UCNPs were shortened at 658 nm in the presence of ClAlTSPc when the former was embedded in fiber and suspended in a dimethyl sulfoxide solution of the latter. A clear singlet oxygen generation by ClAlTSPc though Förster resonance energy transfer was demonstrated using a singlet oxygen quencher, 1,3-diphenylisobenzofuran.
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown, South Africa.
Zane
Z
Watkins
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown, South Africa.
Jessica
J
Taylor
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown, South Africa.
Sarah
S
D'Souza
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown, South Africa.
Jonathan
J
Britton
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown, South Africa. t.nyokong@ru.ac.za.
Tebello
T
Nyokong
Aluminium tetrasulfo phthalocyanine; Electrospun fibers; Fluorescence quantum yields; Triplet quantum yields; Upconversion nanoparticles