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Two kinds of organic light-emitting device were prepared with the same structure of ITO/PVK:Ir(ppy) 3 (100:2)/BCP(10nm)/Alq 3 (20nm)/Al, but with different evaporation conditions for the hole-blocking layer BCP and the charge-transporting layer Alq 3 . The films of BCP and Alq 3 in device 1 were prepared with the chamber in complete darkness, and in device 2 they were...
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