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

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OLEDs with thermally activated delayed fluorescence

Bibliography

(1) - BERNANOSE (A.), VOUAUX (P.) - Electroluminescence organique: étude du mode d'émission, - J. Chim. Phys., vol. 50, pp. 261-263, (1953).
(2) - POPE (M.), KALLMANN (H.P.), MAGNANTE (P.) - Electroluminescence in Organic Crystals, - J. Chem....