Photoluminescence Dynamics of Aluminumquinoline/Oxadiazole Multilayer Structures

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Abstract
Photoluminescence (PL) dynamics of aluminumquinoline/oxadiazole (Alq3/PBD) multilayer structures, which may possess a carrier confinement type-I energy lineup, has been investigated by time-resolved PL spectroscopy with a mode-locked Ti-sapphire laser. The decay time of the emission from PBD in the multilayer structure was as fast as several picoseconds, in contrast to that from a PBD single layer, 1.7 ns, and tended to increase with an increase in PBD thickness. For the emission from Alq3, on the other hand, only a slight increase in the decay time was observed in the multilayer structure compared to a single layer. These results indicate the rapid energy transfer from PBD to Alq3, similar to that in semiconductor quantum well structures with the type-I energy lineup.