Oxygen-dependent quenching of phosphorescence has been used extensively for the last 25 years as a reliable method for measuring oxygen. Major strengths of the method are that it is noninvasive, except for the phosphor, and calibration is absolute. Because it is an optical method, oxygen can be measured through the walls of optically clear chambers. The method’s absolute calibration means that ...

Donor–acceptor–donor molecules containing heavy chalcogen atoms, which feature multi-color polymorphism, external-stimuli responsive luminochromism, thermally-activated delayed fluorescence, and room-temperature phosphorescence, have been developed.

The phosphorescence decay rates of thallium-doped ammonium chloride (NHUChTl) phosphors, prepared by crystallization from aqueous solution, have been studied at room temperature for near-ultraviolet emission. The effects of impurity concentration as well as thermal and/or mechanical treatment on the decay rates have been examined. Phosphorescence centres consisting of a Tl+ion and a nearby nega...

Metallophthalocyanines (MPc-o-Cou, M = Fe, Co, Ni, and Cu) with fourth period metal ions have been successfully applied as a sensitizer coupled with rubrene (Rub) in photon upconversion based on triplet-triplet annihilation. An upconversion quantum yield (ϕPUC) of up to 4.82% was observed in the CoPc-o-Cou : Rub couple. The absorption and phosphorescence emission spectra showed that the Q bands...

The emission anisotropy spectra, r,(λ ) of p-cyano-dimethylaniline (CDMA) and p-cyano-diethylaniline (CDEA) in PVA films are temperature dependent. At 296 K a characteristic dependence of r,(λ ) on the absorption (A), short emission (SE) and long emission (LE) band, responsible for the total emission of fluorescence and phosphorescence is observed. On temperature enhancement to 355 K and next t...