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

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

doi:10.1103/physrevapplied.17.l051002

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

Journal Article · Thu May 26 00:00:00 EDT 2022 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.17.l051002· OSTI ID:1877185

^[1]; ^[2]; Lang, Chao ^[2]; ^[3]; Kondakova, Marina ^[4]; ^[4]; Hickner, Michael ^[2]; ^[3]; ^[2]

Pennsylvania State Univ., University Park, PA (United States); Penn State University
Pennsylvania State Univ., University Park, PA (United States)
Univ. of Minnesota, Minneapolis, MN (United States)
OLEDWorks LCC, Rochester, NY (United States)

Spontaneous orientational polarization (SOP) in the electron-transport layer (ETL) of organic light-emitting diodes (OLEDs) is increasingly recognized as a key factor influencing their performance. Here, we show 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 in this manner 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. We show that the EQE and lifetime improvements both originate from reduced exciton-polaron annihilation in the emissive layer, and that this leads to a functional relationship between the two quantities that can be used to quantify the rate of annihilation-induced degradation in the device. Furthermore, these results highlight a substantial opportunity to improve OLED performance by controlling SOP through semiconductor dilution and suggest that this capability can be used to systematically isolate and understand exciton-polaron degradation in the pursuit of stable blue OLEDs.

View Accepted Manuscript (DOE)

Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008717

OSTI ID:: 1877185

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 5 Vol. 17; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Electric polarization
Electroluminescence
Excitons
Optoelectronics
Organic LEDs
Organic electronics
Organic semiconductors
Polarons

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

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