Towards rare-earth-free white light-emitting diode devices based on the combination of dicyanomethylene and pyranine as organic dyes supported on zinc single-layered hydroxide

A new luminescent composite film resulting from the dispersion of luminescent organic dyes in a single-layered hydroxide (SLH)-type inorganic matrix has been developed. Two fluorescent organic dyes emitting visible light upon blue LED excitation were investigated in this study: dicyanomethylene (DCM...

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Published inBeilstein journal of nanotechnology Vol. 10; no. 1; pp. 760 - 770
Main Authors Nyalosaso, Jeff L, Boonsin, Rachod, Vialat, Pierre, Boyer, Damien, Chadeyron, Geneviève, Mahiou, Rachid, Leroux, Fabrice
Format Journal Article
LanguageEnglish
Published Germany Beilstein-Institut zur Föerderung der Chemischen Wissenschaften 2019
Karlsruhe Institute of Technology
Beilstein-Institut
Subjects
Chemical Sciences
Color
Color temperature
dicyanomethylene (DCM)
Dispersion
Display devices
Dyes
Emission analysis
Ethanol
Fluorescent dyes
Full Research Paper
hybrid luminescent films
Light emission
Light emitting diodes
light-emitting diode (LED)
Material chemistry
Nanoscience
Nanotechnology
Optical properties
Photometry
pyranine
Rare earth elements
Visible spectrum
White light
Zinc
zinc hydroxyacetate
France
China
dicyanomethylene (DCM)
pyranine
light-emitting diode (LED)
hybrid luminescent films
zinc hydroxyacetate
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Summary:A new luminescent composite film resulting from the dispersion of luminescent organic dyes in a single-layered hydroxide (SLH)-type inorganic matrix has been developed. Two fluorescent organic dyes emitting visible light upon blue LED excitation were investigated in this study: dicyanomethylene (DCM) and pyranine (HPTS). These dyes exhibit broad emission bands that cover a large part of the visible spectrum. The concept developed in our work consisted in keeping SLH in its wet form to ensure a good dispersion of the fluorescent dyes prior to immobilizing the hybrid materials in a silicone polymer to achieve luminescent composite films. We demonstrate that these coatings stacked upon each other and placed above a blue LED lead to white-light emission with suitable photometric parameters for applications in lighting or display devices: colour temperature of 5409 K and colour rendering index (CRI) of 81.
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ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.10.75