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White Light Emission from Fluorescent SiC with Porous Surface
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Meijo University, Japan.
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 9798Article in journal (Refereed) Published
Abstract [en]

We report for the first time a NUV light to white light conversion in a N-B co-doped 6H-SiC (fluorescent SiC) layer containing a hybrid structure. The surface of fluorescent SiC sample contains porous structures fabricated by anodic oxidation method. After passivation by 20 nm thick Al2O3, the photoluminescence intensity from the porous layer was significant enhanced by a factor of more than 12. Using a porous layer of moderate thickness (similar to 10 mu m), high-quality white light emission was realized by combining the independent emissions of blue-green emission from the porous layer and yellow emission from the bulk fluorescent SiC layer. A high color rendering index of 81.1 has been achieved. Photoluminescence spectra in porous layers fabricated in both commercial n-type and lab grown N-B co-doped 6H-SiC show two emission peaks centered approximately at 460 nm and 530 nm. Such blue-green emission phenomenon can be attributed to neutral oxygen vacancies and interface C-related surface defects generated dring anodic oxidation process. Porous fluorescent SiC can offer a great flexibility in color rendering by changing the thickness of porous layer and bulk fluorescent layer. Such a novel approach opens a new perspective for the development of high performance and rare-earth element free white light emitting materials.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 7, article id 9798
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-140963DOI: 10.1038/s41598-017-10771-7ISI: 000408538100040PubMedID: 28852169OAI: oai:DiVA.org:liu-140963DiVA, id: diva2:1142392
Note

Funding Agencies|Innovation Fund Denmark [4106-00018B]

Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2017-10-06

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