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An organic light-emitting diode (OLED) is a type of light-emitting device that uses organic compounds to produce light when an electric current passes through it. The basic structure of an OLED consists of several layers deposited on a substrate, typically glass or flexible plastic. The main layers include the anode, organic layers, and cathode. The organic layers are further divided into a hole transport layer ___ ________ ___ ___ _________ ________ ____ _____ __________ ___.
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