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An OLED display is a laminated construction, which consists of three layers, namely a hole transport layer (HTL), an emitting layer (EML) and an electron transport layer (ETL). The HTL transports holes (plus), the ETL transports electrons (minus), and the holes and electrons are brought into the EML, and combined to emit light. OLED Display Materials including: Hole Transport Layer (HTL), Electron Transport Layer (ETL), Emissive Layer (EML), Substrates, Anode (ITO), Cathod (Al) and Hole Injection Layer (HIL).
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