A direct observation of up-converted room-temperature phosphorescence in an anti-Kasha dopant-matrix system
It is common sense that emission maxima of phosphorescence spectra (λP) are longer than those of fluorescence spectra (λF). We report a serendipitous finding of up-converted room-temperature phosphorescence with λP < λF and phosphorescence lifetime > 0.1 s in dopant-matrix systems.
