Achieving long-lived, deep blue phosphorescent organic light-emitting diodes via polariton enhanced Purcell effect

Haonan Zhao; Stephen R. Forrest; Boning Qu; Dejiu Fan

doi:10.1117/12.2677839

1 October 2023 Achieving long-lived, deep blue phosphorescent organic light-emitting diodes via polariton enhanced Purcell effect

Haonan Zhao, Stephen R. Forrest, Boning Qu, Dejiu Fan

Author Affiliations +

Proceedings Volume PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII; PC126590F (2023) https://doi.org/10.1117/12.2677839
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

Phosphorescent organic light emitting diodes (PHOLEDs) feature high efficiency, brightness, and color tunability suitable for both display and lighting applications. However, overcoming the short operational lifetime of blue PHOLEDs remains possibly the most challenging problem in the field of organic electronics. Their short lifetimes originate from the annihilation of high energy, long-lived blue triplets that leads to molecular dissociation. Here, we introduce the polariton-enhanced Purcell effect to reduce the triplet density, and hence the probability for destructive high-energy triplet-polaron (TPA) and triplet-triplet annihilation (TTA) events. Besides the common optical modes in conventional devices, we couple triplets to plasmon-exciton-polaritons and cavity modes to significantly increase the strength of the Purcell effect. We achieve a four-fold improvement in LT95 (time to 95% of the initial luminance) of a blue PHOLED with a Purcell factor of 2.4. Furthermore, the chromaticity coordinates of a cyan emitting Ir-complex were shifted to (0.14, 0.14), a deep blue color suitable for displays. The power law between lifetime enhancement and the Purcell factor is between 1.4 and 2.2, suggesting contributions to degradation from both TPA and TTA. The polariton-enhanced Purcell effect and microcavity engineering provide new possibilities for extending the PHOLED lifetime, particularly in the deep blue spectral range essential for wide color gamut displays.

Conference Presentation

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Haonan Zhao, Stephen R. Forrest, Boning Qu, and Dejiu Fan "Achieving long-lived, deep blue phosphorescent organic light-emitting diodes via polariton enhanced Purcell effect", Proc. SPIE PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII, PC126590F (1 October 2023); https://doi.org/10.1117/12.2677839

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KEYWORDS

Phosphorescent organic light emitting diodes

Polaritons

Engineering

Light sources and illumination

Molecular electronics

Optical microcavities

Organic electronics

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