Organic light-emitting device (OLED) is a semiconductor device that uses functional organic materials to realize carrier migration and compound luminescence under applied voltage. A complete OLED material structurally including ITO transparent electrode (Anode), Hole injection layer (HIL), Electron transport layer (ETL), Electron injection layer (EIL) and Cathode. The luminescent materials commonly used in OLED include fluorescent materials, phosphorescent materials and a new generation of luminescent materials thermally activated delayed fluorescence (TADF) materials.
Fig.1 Typical multilayer OLED structure
After years of research and development, OLED technology is increasingly mature. As the technology matures, the cost of OLED gradually decreases, and it is widely used in display devices and has been deeply studied and applied in the biomedical field.
Fig.2 Variable electroluminescence spectra of OLED 
Fig.3 Flexible OLED display
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