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240530s2024 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202313037
|2 doi
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|a pubmed25n1242.xml
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|a (DE-627)NLM372986234
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|a (NLM)38810365
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Meier, Johanna
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Graphene-Enhanced UV-C LEDs
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 08.08.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH.
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|a Light-emitting diodes in the UV-C spectral range (UV-C LEDs) can potentially replace bulky and toxic mercury lamps in a wide range of applications including sterilization and water purification. Several obstacles still limit the efficiencies of UV-C LEDs. Devices in flip-chip geometry suffer from a huge difference in the work functions between the p-AlGaN and high-reflective Al mirrors, whereas the absence of UV-C transparent current spreading layers limits the development of UV-C LEDs in standard geometry. Here it is demonstrated that transfer-free graphene implemented directly onto the p-AlGaN top layer by a plasma enhanced chemical vapor deposition approach enables highly efficient 275 nm UV-C LEDs in both, flip-chip and standard geometry. In flip-chip geometry, the graphene acts as a contact interlayer between the Al-mirror and the p-AlGaN enabling an external quantum efficiency (EQE) of 9.5% and a wall-plug efficiency (WPE) of 5.5% at 8 V. Graphene combined with a ≈1 nm NiOx support layer allows a turn-on voltage <5 V. In standard geometry graphene acts as a current spreading layer on a length scale up to 1 mm. These top-emitting devices exhibit a EQE of 2.1% at 8.7 V and a WPE of 1.1%
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|a Journal Article
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4 |
|a 2D materials
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| 650 |
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4 |
|a AlGaN
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| 650 |
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4 |
|a graphene
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| 650 |
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4 |
|a light‐emitting diodes
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| 650 |
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4 |
|a uv‐c
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| 700 |
1 |
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|a Zhang, Hehe
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kaya, Umut
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Mertin, Wolfgang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bacher, Gerd
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 36(2024), 32 vom: 15. Aug., Seite e2313037
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
1 |
8 |
|g volume:36
|g year:2024
|g number:32
|g day:15
|g month:08
|g pages:e2313037
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| 856 |
4 |
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|u http://dx.doi.org/10.1002/adma.202313037
|3 Volltext
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|d 36
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