Metal-enhanced fluorescence in polymer composite films with Au@Ag@SiO<sub>2</sub> nanoparticles and InP@ZnS quantum dots

Kim, Ki-Se; Zakia, Maulida; Yoon, Jinhwan; Yoo, Seong Il

doi:10.1039/c8ra08802k

Cited by 15 publications

(10 citation statements)

References 38 publications

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“…It is worthwhile to note that as a cheap, low toxicity, and popularly used material, sodium silicate is readily mixed with water-soluble CDs to form an aqueous solution. ,, After it is dehydrated and solidified by heating, 3D glassy-like structures of silica will be formed and then act as an ideal matrix to disperse carbon dots to avoid aggregation. In addition, poly(vinyl alcohol) (PVA), such a cheap, eco-friendly, and highly hydrophilic polymer with pure surface states, is attracting growing attention as a matrix to maintain the solid fluorescence of CDs for assembling of LEDs …”

Section: Introductionmentioning

confidence: 99%

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Sun

Pan

et al. 2020

ACS Sustainable Chem. Eng.

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Carbon dots (CDs) have aroused more interest in the LED phosphor. High quantum yields and suppressing solid-state luminescence quenching are the key factors for CDs to prepare highquality phosphors. In this work, orange and green emissive CDs (O-CDs and G-CDs) with very high absolute quantum yields (abs. QYs: 85.19% at natural pH and 96.12% at pH 9.0 for G-CDs; 34.89% in aqueous solution and 77.54% in ethanol for O-CDs) were achieved. Then, sodium silicate and PVA were selected as matrices to suppress their aggregation-induced quenching effect. Phosphor powder was prepared by microwave-assisted pyrolysis of sodium silicate and films by self-assembling of PVA in the presence of the CDs. The phosphor powder simultaneously containing G-CDs and O-CDs (G-O-CDsphosphor) presents bright yellow fluorescence but owns a relatively low abs. QY. However, O-CDs/PVA and G-CDs/PVA phosphor films possess very high abs. QYs of 51.51% and 72.81%, respectively. LEDs constructed by coating G-O-CDs-phosphor on a blue chip exhibited a cool white color and a color rendering index (CRI) of 78. Interestingly, high-quality warm white LEDs owning a superior CRI of 93 were achieved by the O-CDs/PVA and G-CDs/PVA films. By comparison, PVA is more suitable to maintain the high performance of G-CDs and O-CDs for high-quality phosphors.

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Section: Introductionmentioning

confidence: 99%

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Sun

Pan

et al. 2020

ACS Sustainable Chem. Eng.

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“…Hybrid plasmon-exciton films have been realized using the layer-by-layer approach with layers of Au or QD thin films separated by well-defined spacer layers. Within these, both quenching and enhancement of the PL intensity were achieved upon tuning the spectral overlap and variation of the polymer/polyelectrolyte layers between the films. − A major concern for NP-based films is the aggregation of NPs upon drying. This causes changes in the LSPR of the metal NP and the emission of the fluorophore, thereby modifying the overall optical response of the hybrid films compared to their counterparts in the solution .…”

Section: Introductionmentioning

confidence: 62%

Controlling Photoluminescence for Optoelectronic Applications via Precision Fabrication of Quantum Dot/Au Nanoparticle Hybrid Assemblies

Nisar

Hapuarachchi

Lermusiaux

et al. 2022

ACS Appl. Nano Mater.

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The distance-dependent interaction of an emitter with a plasmonic nanoparticle or surface forms the basis for the application of such systems within optoelectronics. Semiconductor quantum dots (QDs) are robust emitters due to their photostability. A key challenge is the formation of well-defined assemblies containing QDs and plasmonic nanoparticles in high purity. Here, we present the translation of DNA-based self-assembly to assemble metal and semiconductor nanocrystals into hybrid structures. The high purity of the assemblies, including dimers and higher-order core–satellite structures, allows fundamental investigation of the plasmon–exciton interaction. In contrast to the increase in the QD emission rate and enhancement in steady-state photoluminescence observed for overlap between the QD emission and localized surface plasmon resonance, significant detuning of these energies leads to lengthening of the QD emission lifetime (reduction of the emission rate) up to 1.7-fold and enhancement in steady-state photoluminescence of 15–75%. These results are understood in terms of the Purcell effect, where the gold nanoparticle acts as a damped, nanoscale cavity. We show that the response is driven by the interference experienced by the emitter for parallel and perpendicular field orientations. This provides a mechanism for control of the emission rate of a QD by a metal nanoparticle and a much wider range of lifetimes than previously understood.

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Section: Intrinsic Properties Of Metal–semiconductor Heterostructuresmentioning

confidence: 99%

“…[ 273 ] Another systematic study investigated the influence of increasing Ag shell thickness decorated on Au NRs over fluorescence intensity of In/ZnS QDs doped in poly(lauryl methacrylate) (PLMA) films, shown in Figure 15e. [ 299 ] The fluorescence intensity keep on increasing as the Ag shell thickness is increased. The fluorescence enhancement factor of 2.1 for 4.5 nm shell thickness was reported which increased to 12.9‐fold enhancement for 36 nm shell thickness on side of Au NRs.…”

Section: Intrinsic Properties Of Metal–semiconductor Heterostructuresmentioning

confidence: 99%

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

Kumar

Nisika

Kumar

2020

Advanced Optical Materials

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years, great advances have been made to grow various shaped semiconductor nanocrystals (SNCs) like quantum dots, [7] nanowires, [8] nanorods (NR), [9] and other advanced shaped nanostructures, [10-12] with great precision. However, these semiconductor nanostructures have small extinction cross-sections (even smaller than geometric cross-section), leading to limited absorbance and emission quantum yields. This hinders the progress of semiconductor nanostructures in several areas ranging from clean energy production to various sensing applications. Among many promising solutions, integrating plasmonic nanoparticles (PNPs) with semiconductor nanostructures emerges as the most prominent way to alleviate aforementioned issue. The PNPs have greater extinction cross-section than SNCs (even greater than geometric cross-section), owing to light absorption and scattering by collective and coherent electron oscillations. [13,14] Moreover, these coherent oscillations can couple with electromagnetic wavelengths far greater than particle size, enabling them to guide light to subwavelength scales, thus overcoming diffraction limit. [15] Besides this, proper control over size and shape of plasmonic nanostructures enables engineering of their intrinsic properties to meet the criteria of required application. [16] For instance, by changing the aspect ratio (length to diameter ratio) of nanorods, one can cover wide spectral regions ranging from visible to near-infrared (NIR) regimes. [17] Thus, the integration of plasmonic and semiconductor nanostructures to obtain greater extinction cross-sections and modified properties in these hybrid nanostructures has received great attention from the research community over the past years. The properties of these hybrid nanostructures can be very different from the two nanoconstituents (metal and semiconductor nanostructures), owing to plasmon-exciton interactions. [18-20] Various configurations of metal/semiconductor nanostructures have been synthesized like metallic core/semiconductor shell, [21] semiconductor NR/metal nanoparticles (MNPs), [22] Janus metal/ semiconductor nanostructures, [23] and many others have been reported, [24-26] with varying absorption and emissive properties, targeting high performance applications. The energy transfer between metal-semiconductor nanostructures resulting from integration of PNPs and SNCs Hybrid nanostructures composed of metal and semiconducting nanocrystals have drawn tremendous attention owing to their extraordinary absorption and emission properties. The energy transfer in metal-semiconductor hybrids as a result of synergetic plasmon-exciton interactions leads to numerous applications in the field of solar energy harvesting, photocatalytic reactions, imaging, photonics, sensing, and many more. Various breakthroughs in advanced characterization techniques over the past decade have disclosed several factors affecting the energy transfer processes leading to modified absorption and emission properties in metal-semiconductor hybrids. Herein, various ...

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Metal-enhanced fluorescence in polymer composite films with Au@Ag@SiO₂ nanoparticles and InP@ZnS quantum dots

Abstract: Poly(lauryl methacrylate) films containing Au@Ag@SiO2 nanoparticles and InP@ZnS quantum dots were prepared to investigate metal-enhanced fluorescence in polymer composites.

Cited by 15 publications

References 38 publications

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Controlling Photoluminescence for Optoelectronic Applications via Precision Fabrication of Quantum Dot/Au Nanoparticle Hybrid Assemblies

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

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Metal-enhanced fluorescence in polymer composite films with Au@Ag@SiO2 nanoparticles and InP@ZnS quantum dots

Abstract: Poly(lauryl methacrylate) films containing Au@Ag@SiO2 nanoparticles and InP@ZnS quantum dots were prepared to investigate metal-enhanced fluorescence in polymer composites.

Cited by 15 publications

References 38 publications

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Green and Orange Emissive Carbon Dots with High Quantum Yields Dispersed in Matrices for Phosphor-Based White LEDs

Controlling Photoluminescence for Optoelectronic Applications via Precision Fabrication of Quantum Dot/Au Nanoparticle Hybrid Assemblies

Modified Absorption and Emission Properties Leading to Intriguing Applications in Plasmonic–Excitonic Nanostructures

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Metal-enhanced fluorescence in polymer composite films with Au@Ag@SiO₂ nanoparticles and InP@ZnS quantum dots