Improved Color-Rendering Property of the YAG:Ce-Nanocrystalline-Phosphor-Converted White-Light-Emitting Diode Through the Addition of CuInS<sub>2</sub>/ZnS Quantum Dot

In this work, we report the solvothermal synthesis of Ce-doped YAG (YAG:Ce) nanoparticles (NPs) and their association with a free-Cd CuInS2/ZnS (CIS/ZnS) core/shell QDs for application into white light emitting diode (WLED). 1500 °C-annealed YAG:Ce NPs and CIS/ZnS core/shell QDs exhibited intense yellow and red emissions band with maxima at 545 and 667 nm, respectively. Both YAG:Ce nanophosphor and CIS/ZnS QDs showed high photoluminescence quantum yield (PL QY) of about 50% upon 460 nm excitation. YAG:Ce nanophosphor layer and bilayered YAG:Ce nanophosphor-CIS/ZnS QDs were applied on blue InGaN chip as converter wavelength to achieve WLED. While YAG:Ce nanophosphor converter layer showed low color rendering index (CRI) and cold white light, bilayered YAG:Ce nanophosphor-CIS/ZnS QDs displayed higher CRI of about 84 and warm white light with a correlated color temperature (CCT) of 2784 K. WLED characteristics were measured as a function of forward current from 20 to 1200 mA. The white light stability of bilayered nanophosphor-QDs-based WLED operated at 200 mA was also studied as a function of operating time up to 40 h. Interestingly, CRI and CCT of such device tend to remain constant after 7 h of operating time suggesting that layer-by-layer structure of YAG:Ce phosphor and red-emitting CIS/ZnS QDs could be a good solution to achieve stable warm WLED, especially when high current density is applied.

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Ce-Doped YAG Nanophosphor and Red Emitting CuInS₂/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

Aboulaich

Michalska

Schneider

et al. 2013

ACS Appl. Mater. Interfaces

161

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Improved Color-Rendering Property of the YAG:Ce-Nanocrystalline-Phosphor-Converted White-Light-Emitting Diode Through the Addition of CuInS₂/ZnS Quantum Dot

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Ce-Doped YAG Nanophosphor and Red Emitting CuInS₂/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

Ce-Doped YAG Nanophosphor and Red Emitting CuInS₂/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

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Improved Color-Rendering Property of the YAG:Ce-Nanocrystalline-Phosphor-Converted White-Light-Emitting Diode Through the Addition of CuInS2/ZnS Quantum Dot

Cited by 1 publication

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Ce-Doped YAG Nanophosphor and Red Emitting CuInS2/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

Ce-Doped YAG Nanophosphor and Red Emitting CuInS2/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

Contact Info

Product

Resources

About

Improved Color-Rendering Property of the YAG:Ce-Nanocrystalline-Phosphor-Converted White-Light-Emitting Diode Through the Addition of CuInS₂/ZnS Quantum Dot

Ce-Doped YAG Nanophosphor and Red Emitting CuInS₂/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index

Ce-Doped YAG Nanophosphor and Red Emitting CuInS₂/ZnS Core/Shell Quantum Dots for Warm White Light-Emitting Diode with High Color Rendering Index