Abstract

Organic multiple quantum well structures (OMQWs) and double-layer structures (DLs) are prepared, which consist of alternate organic materials PBD (2-(4-biphenylyl)-5(4- tert -butyl-phenyl)-1,3,4-oxadiazole) and Alq 3 ( tris (8-hydroxyquinoline) aluminum). From the energy diagram, it is similar to type-I quantum well structure of inorganic semiconductor, in which PBD and Alq 3 are both electron-transporting materials, PBD is used as a barrier layer and Alq 3 as a well layer and emitter. The photoluminescence characteristics of OMQWs and DLs are investigated. The photoexcited energy transfer from PBD to Alq 3 in both structures is different with different periods and different layer thicknesses.

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