Effect of the external medium on the spectral characteristics of polypropylene films doped with Eu(fod)3 molecules

We have studied the effect of external factors (humidity, pressure, temperature) on the stability of the organometallic compound Eu(fod)3 (fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octadione) impregnated into polypropylene (PP) using supercritical CO₂. We have established that under the influence of external conditions, there is a decrease in the integrated intensity of the absorption band for the Eu(fod)₃ molecule and the photoluminescence (PL) of Eu³⁺ ions as a function of the properties of the medium, and in the presence of water molecules the shape of the bands for these spectra changes. We propose a physical model explaining the behavior of the absorption and photoluminescence spectra when the polypropylene films are stored under different conditions. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 42–47, January–February, 2007.