Reducing Spontaneous Orientational Polarization via Semiconductor Dilution Improves OLED Efficiency and Lifetime

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Written By Fluxim AG

Emmanuel O. Afolayan , Ibrahim Dursun , Chao Lang, Evgeny Pakhomenko ,Marina Kondakova, Michael Boroson , Michael Hickner, Russell J. Holmes , and Noel C. Giebink

Physical Review Applied 17, LO51002 (2022)

DOI: 10.1103/PhysRevApplied.17.L051002

Spontaneous orientational polarization (SOP) in the electron-transport layer (ETL) of OLEDs is increasingly recognized as a key factor influencing their performance. The authors shows that SOP is dramatically reduced in the common electron-transport material 2,2,2- (1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) by coevaporating it together with medium-density polyethylene. Eliminating SOP from the ETL of blue fluorescent OLEDs reduces their operating voltage by 0.5 V, increases their external quantum efficiency (EQE) by 30%, and leads to a threefold increase in device lifetime.

Fluxim AG
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