Improved Light Extraction in Organic Light‐Emitting Diodes via Semiconductor Dilution

Afolayan, Emmanuel O.; Dursun, Ibrahim; Pizano, Adrian; Lang, Chao; Lungwitz, Dominique; Kondakova, Marina; Boroson, Michael; Kahn, Antoine; Hickner, Michael; Giebink, Noel C.

doi:10.1002/adom.202302588

Improved Light Extraction in Organic Light‐Emitting Diodes via Semiconductor Dilution (in EN)

Journal Article · Wed Dec 13 00:00:00 EST 2023 · Advanced Optical Materials

DOI:https://doi.org/10.1002/adom.202302588· OSTI ID:2229976

^[1]; ^[2]; ^[3]; Lang, Chao ^[1]; ^[4]; Kondakova, Marina ^[5]; Boroson, Michael ^[5]; ^[4]; Hickner, Michael ^[6]; ^[7]

Pennsylvania State Univ., University Park, PA (United States)
Corning Research and Development, NY (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Princeton Univ., NJ (United States)
OLEDWorks, LLC, Rochester, NY (United States)
Pennsylvania State Univ., University Park, PA (United States); Michigan State Univ., East Lansing, MI (United States)
OLEDWorks, LLC, Rochester, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Increasing the internal light extraction efficiency of organic light‐emitting diodes (OLEDs) is key to improving their performance for solid‐state lighting applications; however, it is challenging to do this in a way that is compatible with high volume manufacturing. Here, it is shown that the outcoupling efficiency of OLEDs can be improved by diluting their hole transport layer (HTL) with the low refractive index material trifluoropropyl oligomeric silsesquioxane (F‐POSS). Specifically, co‐evaporating 40 vol.% F‐POSS in the HTL of single and multi‐stack phosphorescent OLEDs decreases its refractive index by Δn ≈ 0.2, which in turn yields a ≈12% increase in their outcoupling efficiency with no impact on electrical performance or operational lifetime. This result is significant because F‐POSS is a small molecule that sublimes cleanly, does not aggregate, and is compatible with state‐of‐the‐art HTL materials, making it a realistic path to increase light extraction in commercial OLEDs manufactured on existing production lines.

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: EE0008717; SC0012458

OSTI ID:: 2229976

Alternate ID(s):: OSTI ID: 2242572
OSTI ID: 2575793

Journal Information:: Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 12 Vol. 12; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: EN

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