Hole Blocking Layer Materials
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A hole-blocking layer plays dual roles in blocking holes moving towards the cathode and transporting the electrons to either electron transport layer or directly to the the emitting layer.
Tris(8-hydroxyquinolinato)aluminium (Alq3), bathocuproine (BCP), TAZ and TPBi are the most commonly used hole-blocking materials. These materials can be used as both electron-transporting layer and hole blocking layer.
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