Controlling polarization-induced exciton-polaron quenching in OLEDs via materials selection, mixtures, and processing conditions (Conference Presentation)

Russell J. Holmes

doi:10.1117/12.2633479

3 October 2022 Controlling polarization-induced exciton-polaron quenching in OLEDs via materials selection, mixtures, and processing conditions (Conference Presentation)

Russell J. Holmes

Author Affiliations +

Proceedings Volume PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI; PC1220810 (2022) https://doi.org/10.1117/12.2633479
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Abstract

Amorphous films with preferential molecular alignment can exhibit spontaneous orientation polarization (SOP). In OLEDs, SOP is frequently observed in the electron-transport layer (ETL), leading to exciton-polaron quneching and peak efficiency loss. We find that the efficiency reduction scales directly with the degree of ETL SOP. We also show that quenching can be tuned by mixing the polar ETL with a non-polar host. Finally, we demonstrate how film processing conditions can serve as an additional axis of control, with elevated substrate temperature and reduced deposition rate during film growth leading to more isotropic molecular orientation, and a reduction in SOP-induced quenching.

Conference Presentation

Citation Download Citation

Russell J. Holmes "Controlling polarization-induced exciton-polaron quenching in OLEDs via materials selection, mixtures, and processing conditions (Conference Presentation)", Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC1220810 (3 October 2022); https://doi.org/10.1117/12.2633479

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