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3. Phosphorescent OLEDs
In 1998, Forrest's team (Princeton University, USA) announced that they could recover 100% of the excitons formed in SCO by transferring them to a phosphorescent dopant present in small quantities in the latter . Phosphorescent diodes (PhOLEDs), whose emissive layer is a mixture of SCO and dopant, gradually took the place of fluorescent OLEDs, leading to a considerable increase in device performance.
3.1 Operating principle
In a PhOLED, the active layer is a SCO (serving as host matrix)...
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Phosphorescent OLEDs
OLEDs with thermally activated delayed fluorescence
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