Fluorescence stability of 8-hydroxyquinoline aluminum

Physical and chemical characteristics of 8-hydroxyquinoline aluminum (Alq3) have been investigated in this work. The fluorescence stabilities of Alq3 films were compared before and after UV irradiation. They were analyzed by using a UV-Vis absorption spectrophotometer, an in situ fluorescence spectrometer, attenuated X-ray photoelectron spectroscopy, and a nanosecond fluorescence spectrophotometer. Degradation in photoluminescence properties was significant in the presence of humid air (at an 85% relative humidity). These results indicate that water and oxygen aid the photodegradation, and the degradation mechanism of Alq3 in the presence of H2O and O2 is discussed in terms of chemical reactions.