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| Details of top-emitting red OLEDs investigated. (a) Cross-section of OLEDs. (b) Microscope image of different sizes of OLEDs operated at 3 V. (c) Energy diagram. (a) CPL, capping layer; ETL, electron transport layer; HBL, hole blocking layer; EML, emission layer; EBL, electron blocking layer; HTL, hole transport layer; HIL, hole injection layer. (b) Each symbol indicates the types of electrodes: cathode (K) and anode (A). |
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