Quantum dot scaffold phosphors: Maximizing luminescence quantum yield via different stock environments

•Study presents a novel concept for quantum dots scaffold phosphors.•Graphene quantum-dots (GQDs) has utilized as the luminescent material.•High porosity maintains highest level luminescence quantum yield.•Scaffold phosphor envisioned for high-performance phosphor-converted LEDs. This paper presents...

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Bibliographic Details
Published in:Materials letters 2020-01, Vol.259, p.126846, Article 126846
Main Authors: Kumar, Mirgender, Kumar, Anuj, Makki, Aya Hekmet, Seong, Kwang-Su, Park, Si-Hyun
Format: Article
Language:English
Subjects:
Free radical polymerization
Freeze drying
Graphene
Graphene quantum dots
Hydrogels
Luminescence
Luminescence quantum yield
Materials science
Phosphors
Photoluminescence
Pore size
Porosity
Quantum dots
Scaffolds
Time-resolved photoluminescence
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Summary:•Study presents a novel concept for quantum dots scaffold phosphors.•Graphene quantum-dots (GQDs) has utilized as the luminescent material.•High porosity maintains highest level luminescence quantum yield.•Scaffold phosphor envisioned for high-performance phosphor-converted LEDs. This paper presents a novel concept for quantum-dots (QDs) phosphor plates using a polymer scaffold matrix. Here, graphene quantum-dots (GQDs) has utilized as the luminescent material in a polymeric scaffold prepared by free-radical polymerization followed by freeze-drying. The highly porous scaffold (porosity: ~60%, pore size in broad micron size) maintained the individual identity of the quantum dots for the beauty of high luminescence quantum yield, which is necessary for fabricating efficient phosphors. These outcomes were strongly reinforced by time-resolved photoluminescence. This study offers a systematic approach for tuning the luminescence property of quantum dots in different states such as powders, liquids, hydrogels, and freeze-dried scaffolds.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.126846