Photoluminescent spectra of 8-hydroxyquinoline aluminum embedded in porous alumina

Organic electroluminescent (EL) device based on Alq(3), has attracted much interest for its potentiality in material and device process, but the fluorescent degradation is significant in the presence of atmospheric moisture, At prensent, researchers try to encapsulate it in special environments with cooler equipments, thus it makes the capacity larger. Anodically oxidized alumina whose structure can be described as a close-packed array of columns,each containing many fine regular parallel-bided pores are usually used as a transparent host template for a variety of luminescent materials. The pore of anodic alumina was much larger than the molecular diameter of 8-hydroxyquinoline alumina, which can be successfully embedded in the porous alumina. We have studied the photoluminescence(PL) of the embedded films and compare them with the PL of Alq3 in alcohol. It was shown that the PL of the embedded film was similar to that in liquid, but the symmetry of the compound Film is better. The peak of it exhibits blue shift, however, the full width at half maximum is larger. The experimental results suggest that the porous alumina may be a better encapsulated media for Alq(3), and this may invoke a new way for Alq3 in the application in electroluminescence.