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White Light Emission from Fluorescent SiC with Porous Surface
Weifang Lu1, Yiyu Ou1, Elisabetta Maria Fiordaliso2
1Department of Photonics Engineering, Technical University of Denmark, DK-2800, Kgs, Lyngby, Denmark.
Scientific Reports
|August 31, 2017
Summary
We developed a novel method for converting near-ultraviolet light to white light using porous, nitrogen-boron co-doped silicon carbide (SiC). This rare-earth-free material offers high-quality white light emission and excellent color rendering.
Area of Science:
- Materials Science
- Solid State Physics
- Optoelectronics
Background:
- Silicon carbide (SiC) is a promising material for optoelectronic devices.
- Developing efficient and rare-earth-free white light-emitting materials is crucial for next-generation lighting.
Purpose of the Study:
- To achieve near-ultraviolet (NUV) to white light conversion using a novel porous N-B co-doped 6H-SiC structure.
- To investigate the photoluminescence properties and potential for high-quality white light emission.
Main Methods:
- Fabrication of porous structures on N-B co-doped 6H-SiC via anodic oxidation.
- Passivation of the porous layer with Al2O3.
- Characterization of photoluminescence spectra and color rendering properties.
Main Results:
- Significant enhancement (over 12x) of photoluminescence intensity after Al2O3 passivation.
- Achieved high-quality white light emission by combining blue-green emission from the porous layer and yellow emission from the bulk SiC.
- Obtained a high color rendering index of 81.1.
Conclusions:
- Porous fluorescent SiC offers a flexible platform for tunable white light emission.
- The developed material is rare-earth-free, opening new avenues for high-performance lighting applications.
- The blue-green emission is attributed to oxygen vacancies and carbon-related surface defects generated during fabrication.
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