Oxygen phosphorescence upon excitation at a wavelength of 765 nm

The phosphorescence of oxygen in the liquid phase and in a solution in carbon tetrachloride was studied upon excitation at a wavelength of 765 nm using an LED array as a source of direct optical excitation. A comparison is made of the observed efficiency of oxygen phosphorescence at a wavelength of 1270 nm upon its excitation at a wavelength of 765 nm with its excitation at other wavelengths, which partially or completely coincide with the absorption lines of molecular oxygen complexes. Key words: phosphorescence, singlet oxygen, molecular complexes, optical excitation, LED matrices.