Absorption and emission spectroscopic characterization of platinum-octaethyl-porphyrin (PtOEP)

• Published in: Chemical physics Vol. 330; no. 1; pp. 118 - 129
• Main Authors: Bansal, A.K., Holzer, W., Penzkofer, A., Tsuboi, Taiju
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 08.11.2006
• Subjects: Amplified spontaneous emission; Doped film; Liquid solutions; Neat film; Organometallic complex; Phosphorescence lifetime; Phosphorescence quantum yield; Platinum-octaethyl-porphyrin; PtOEP; Singlet–triplet absorption; Stimulated emission cross-section; Triplet–triplet annihilation; Phosphorescence lifetime; Stimulated emission cross-section; Triplet–triplet annihilation; Liquid solutions; Neat film; Platinum-octaethyl-porphyrin; Organometallic complex; PtOEP; Doped film; Phosphorescence quantum yield; Singlet–triplet absorption; Amplified spontaneous emission
• ISSN: 0301-0104
• DOI: 10.1016/j.chemphys.2006.08.002

The absorption and emission spectroscopic behaviour of the platinum complexed porphyrin PtOEP (platinum-octaethyl-porphyrin) is studied at room temperature. Liquid solutions, doped films, and a neat film are investigated. The absorption cross-section spectra including singlet–triplet absorption, the triplet–singlet stimulated emission cross-section spectra, the phosphorescence quantum distributions, the phosphorescence quantum yields, and the phosphorescence signal decays are determined. In the neat film a red-shifted phosphorescent excimer emission is observed. In diluted solid solution (polystyrene and dicarbazole-biphenyl films) as well as in de-aerated liquid solutions (tetrahydrofuran, toluene, chloroform) high phosphorescence quantum yields are obtained. In air-saturated liquid solutions, the phosphorescence efficiency is reduced by oxygen quenching. At intense short-pulse laser excitation the phosphorescence lifetime is shortened by triplet–triplet annihilation. No amplification of spontaneous emission was observed.