High-efficiency organic polymer light-emitting heterostructure devices on flexible plastic substrates

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Abstract
In this letter, we describe a high-efficiency organic polymer light-emitting heterostructure device with aluminum cathode fabricated on a thin, flexible plastic substrate. The device consists of a hole transporting (amine-fluorene) and an emissive (benzothiadiazole-fluorene) conjugated organic polymer layers. The best heterostructure device has a green light emission and a maximum luminance higher than 2000 cd/m2. Device shows a maximum emission of ∼56.2 cd/A and, accordingly, a maximum luminous and external quantum efficiency of ∼9.0 lm/W and ∼ 15%,∼15%, respectively. This organic light-emitting diode performance is acceptable for flat panel display applications. © 2000 American Institute of Physics