A molecular thermometer based on luminescence of copper(II) tetraphenylporphyrin

Abstract

The photoluminescence (PL) spectra from solid samples consisting of polystyrene and 5,10,15,20-tetraphenyl-21H,23H-porphine copper(II) (CuTPP) revealed two sharp peaks at 653 and 720 nm, and indicated another broad peak at around 780 nm, which could not be observed in CuTPP solutions. The intensity ratio of the two peaks appearing at 653 nm and at around 780 nm demonstrated clear dependence on temperature. This dependence of the PL intensity ratio was observed under the atmosphere and even in water. The findings mean that we were able to utilize PL from CuTPP as a thermometer under various conditions. We measured the temperatures of an organic light-emitting diode (OLED) during operation based on its electroluminescence, where the OLED contained CuTPP as a light emitting dopant, to demonstrate the CuTPP thermometer.

Photoluminescence temperature quenching of H2TPP and ZnTPP tetraphenylporphyrins thin films

“…Organic compounds are of a particular interest for creating flexible, lightweight, transparent and at the same time efficient and inexpensive devices based on them. The possibility of creating organic nanostructures make porphyrins promising materials for optoelectronic device creation such as CCDs and OLEDs [1], photosensitive materials [2], sensors [3] and photodetectors [4]. Photoluminescence measurements of organic semiconductors is an informative method for studying the electronic spectra of semiconductors and its composites.…”