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

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

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 ^[4];

^[5]; Kondakova, Marina ^[6]; Boroson, Michael ^[6];

^[5]; Hickner, Michael ^[7];

^[8]

Department of Electrical Engineering The Pennsylvania State University University Park PA 16802 USA
Corning Research and Development Sullivan Park Corning NY 14831 USA
Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA
Department of Material Science The Pennsylvania State University University Park PA 16802 USA
Department of Electrical Engineering Princeton University Princeton NJ 08544 USA
OLEDWorks LLC 1645 Lyell Ave. Rochester NY 14606 USA
Department of Material Science The Pennsylvania State University University Park PA 16802 USA, Department of Chemical Engineering and Materials Science Michigan State University East Lansing MI 48824 USA
Department of Electrical Engineering The Pennsylvania State University University Park PA 16802 USA, Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 USA

Abstract 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 Δ n ≈ 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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Sponsoring Organization:: USDOE

OSTI ID:: 2229976

Alternate ID(s):: OSTI ID: 2242572

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

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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