One-step synthesis of yellow-emitting carbogenic dots toward white light-emitting diodes

We report herein the synthesis of carbogenic dots (CDs) by a one-step pyrolysis from N -acetylcysteine. The as-prepared CDs show excellent dispersibility with particle sizes in the range of 3–5 nm. Under stimulation with blue light, the CDs emit broad yellow fluorescence, which is still rarely repor...

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Bibliographic Details
Published in:Journal of materials science 2013-03, Vol.48 (6), p.2352-2357
Main Authors: Chen, Qiao-Ling, Wang, Cai-Feng, Chen, Su
Format: Article
Language:English
Subjects:
Acetylcysteine
Cadmium sulfides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Dependence
Economics
Fluorescence
Gallium nitrides
Light emission
Light emitting diodes
Materials Science
Optical properties
Organic light emitting diodes
Phosphors
Polymer Sciences
Pyrolysis
Solid Mechanics
Synthesis
White light
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Summary:We report herein the synthesis of carbogenic dots (CDs) by a one-step pyrolysis from N -acetylcysteine. The as-prepared CDs show excellent dispersibility with particle sizes in the range of 3–5 nm. Under stimulation with blue light, the CDs emit broad yellow fluorescence, which is still rarely reported by now. The optical properties were throughly investigated, and we found the CDs exhibit stable fluorescence, high quantum yield, and pH dependence. Moreover, an economical approach for constructing white light-emitting diodes (LEDs) was developed by combining the yellow-emitting CDs with blue GaN-based LED chips. The white LEDs exhibit warm white light with the color coordinates of (0.34, 0.35), very close to the coordinates of balanced white-light emission (0.33, 0.33). These results suggest that the CDs can be a promising candidate as yellow-emitting phosphor for white LEDs.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-7016-8