Photoluminescence Tuning in Stretchable PDMS Film Grafted Doped Core/Multishell Quantum Dots for Anticounterfeiting

Li, Fēi; Wang, Xiandi; Xia, Zhiguo; Pan, Caofeng; Liu, Quanlin

doi:10.1002/adfm.201700051

Cited by 97 publications

(58 citation statements)

References 57 publications

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“…Public security remains a global challenge and the utilization of LFs, bar‐codes for anti‐counterfeiting, and confidential data encryption, among others, are being currently applied by forensic institutions . In particular, LFs appears to be the best option for personnel identification in forensic investigations due to their high stability, uniqueness and complexity of ridges patterns .…”

Section: Methodsmentioning

confidence: 99%

“…Fluorescent-labeledmaterials (FLMs) are very important entities with widespread applicability, ranging from white light emitting diodes (WLED), [1] molecular imaging, [2] in vivo and in vitro cellular targeting and imaging, [3] to detection of latent fingerprints (LFs) in the forensic sector. [4][5][6][7][8][9] Within this context, FLMs possess better featurest han classical fluorescent organic dyes, [3,10] including highera bsorption coefficientsa nd sensitivity,a voiding possible photobleaching, larger emission lifetimes and very low toxicitya llowing them to be applied in vitro and in vivo analysis. [11] Public security remains ag lobal challenge and the utilization of LFs, bar-codesf or anti-counterfeiting, and confidential data encryption, among others, are being currently appliedb yf orensic institutions.…”

mentioning

confidence: 99%

“…[11] Public security remains ag lobal challenge and the utilization of LFs, bar-codesf or anti-counterfeiting, and confidential data encryption, among others, are being currently appliedb yf orensic institutions. [5][6][7][8][9] In particular,L Fs appears to be the best optionf or personnel identification in forensic investigations due to their high stability,u niquenessa nd complexityo fr idges patterns. [9,12,13] In an attempt to improve the traditional fingerprint detection methods, [14] fluorescent nanomaterials have been found to be suitable platforms for the development of LFs.…”

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confidence: 99%

See 2 more Smart Citations

Fluorescent‐Labeled Octasilsesquioxane Nanohybrids as Potential Materials for Latent Fingerprinting Detection

Dare

Vendrell-Criado

Jiménez

et al. 2020

Chemistry A European J

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The recent demand for fluorescent‐labeled materials (FLMs) in forensic security concepts such as latent fingerprints (LFs) that encode information for anti‐counterfeiting and encryption of confidential data makes necessary the development of building new and innovative materials. Here, novel FLMs based on polyhedral oligomeric silsesquioxanes (POSS) functionalized with fluorophores via “click” reactions have been successfully synthesized and fully characterized. A comprehensive study of their photophysical properties has displayed large Stokes's shift together with good photostability in all cases, fulfilling the fundamental requisites for any legible LF detection on various surfaces. The excellent performance of the hetero‐bifunctional FLM in the visualization of LF is emphasized by their legibility, selectivity, sensitivity and temporal photostability. In this study, development mechanisms have been proposed and the overall concept constitute a novel approach for vis‐à‐vis forensic investigations to trace an individual's identity.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

See 1 more Smart Citation

Fluorescent‐Labeled Octasilsesquioxane Nanohybrids as Potential Materials for Latent Fingerprinting Detection

Dare

Vendrell-Criado

Jiménez

et al. 2020

Chemistry A European J

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“…CdSe/ZnS QDs are mostly picked up for their high PL QY, stability, and superiority in quantitative probing of Cu 2+ for selective PL quenching by Cu 2+ ions . Li et al illustrated a tunable, transparent, and stretchable luminescent film for anticounterfeiting applications through employing colloidal CdS/ZnS/ZnS:Mn 2+ /ZnS core/multishell QDs embedded in polydimethylsiloxane (PDMS) …”

Section: Applicationsmentioning

confidence: 99%

Design Principles and Material Engineering of ZnS for Optoelectronic Devices and Catalysis

Liu

Chen

et al. 2018

Adv Funct Materials

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ZnS, as one of the first semiconductors discovered and a rising material star, has embraced exciting breakthroughs in the past few years. To shed light on the design principles and engineering techniques of ZnS for improved/novel optoelectronic properties, the fundamental mechanisms and commonly employed strategies are proposed in this review. Recent progress on modifications of ZnS allows it to be extensively and effectively used in versatile applications, including transparent conductors, UV photodetectors, luminescent devices, and catalysis, which are clearly and comprehensively summarized in this work. Novel functional devices springing up from the newly developed ZnS-based materials are highlighted as well. This review not only provides a scientific insight into the advances of ZnS-based materials, but also touches on the future opportunities in this inspiring field.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201802029. relatively high charge recombination rate and low charge transport process inhibit the optoelectronic properties of ZnS as a high-performance photodetector. As a window layer of optoelectronic devices, a lack of high electrical conductivity typically hinders the practical use of ZnS in solar cells, photodiodes, light-emitting devices, etc. As a photocatalyst, the transparency of ZnS becomes a drawback as it suffers from a poor utilization of sunlight.There is not a perfect material, but the potential of developing a material is beyond limitation. The past few years have witnessed extensive designing and engineering of ZnS to explore its potentials in specific applications. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] This review summarizes the recent breakthroughs on ZnS-based materials as excellent candidates in optoelectronic devices, photocatalysis, and other novel functional devices. More importantly, it sheds light on the design principles and fundamental mechanisms of the improved performance of ZnS through strategies such as developing novel nanostructures, bandgap engineering, alloying with other materials, etc. To the best of our knowledge, it is the first comprehensive review on the design principles and material engineering of ZnS for novel/improved properties and intended applications. Briefly, current literature on a variety of ZnS-based structures was first summarized, ranging from 0D to 2D nanostructures. Then, the representative applications of ZnS-based materials are described, which are mainly consisted of four parts, as shown in Figure 1: transparent conductors, UV photodetectors, luminescent devices, and catalysis. Each part contains the latest design strategies of ZnS for the intended applications, fabrication techniques, representative examples, and the state-of-the-art devices. Finally, it outlines the challenges and opportunities in each field. In particular, we provide our perspectives on the future research directions of ZnS in energy and environment.

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“…A possible approach for this purpose is to incorporate QDs into a transparent composite film, in which the polymer matrix provides mechanical stretchability and chemical stabilization for the nanosized particles . Unfortunately, assembling QDs into solid films from solvents generally results in agglomeration and complexation with polymer molecules, dramatically deteriorating the photoluminescence quantum yield (PLQY) due to nonradiative processes.…”

Section: Introductionmentioning

confidence: 99%

Over 1000‐Fold Enhancement of the Unidirectional Photoluminescence from a Microsphere‐Cavity‐Array‐Capped QD/PDMS Composite Film for Flexible Lighting and Displays

Yang

Wang

et al. 2019

Advanced Optical Materials

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to their transparency, solution processability, broad absorption, high quantum yield (QY), tunable bandgap, and sharp emission spectrum. [5][6][7][8][9] In recent years, the development of flexible lighting/display devices has required the integration of luminescence materials on flexible substrates with the characteristics of luminescence properties and the capability to be stretched into arbitrary shapes.A possible approach for this purpose is to incorporate QDs into a transparent composite film, in which the polymer matrix provides mechanical stretchability and chemical stabilization for the nanosized particles. [10][11][12] Unfortunately, assembling QDs into solid films from solvents generally results in agglomeration and complexation with polymer molecules, dramatically deteriorating the photoluminescence quantum yield (PLQY) due to nonradiative processes. The PL intensity of QDs embedded in a polymer matrix is acknowledged to be several times lower than that of colloidal QDs. [13][14][15] Moreover, the weakening of the out-coupling efficiency by the high refractive index polymer matrix further reduces the PL emission from the film. [16][17][18] These inherent drawbacks limit the development of QDs used in flexible devices for practical applications. TheThe development of quantum dot (QD) composite films for lighting and displays is of great importance because of their exceptional mechanical flexibility, chemical stability, and optical tunability. Generally, QDs are attached to plasmonic nanostructures to enhance their photoluminescence (PL) emission. However, plasmonic QD composite films suffer from deteriorated inherent quantum yields and lower enhancement ratios due to variations in the refractive index and dielectricity in the composites. Herein, the use of a dielectric microsphere cavity is reported to realize over 1000-fold enhancement of the PL in CdSe/ZnS QD/polydimethylsiloxane films with a highly unidirectional emission angle of ≈9°. The field regulation by the optical whispering-gallery resonance and directional antenna effect at the microscale is revealed to interpret the PL enhancement mechanism. Additionally, the microsphere cavity allows for the enhancement of white-light emission in the RGB-QD hybrid composite film. The present work inspires a straightforward strategy for boosting the light efficiency in QD composite films, with promising applications in flexible lighting/display devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Photoluminescence Tuning in Stretchable PDMS Film Grafted Doped Core/Multishell Quantum Dots for Anticounterfeiting

Cited by 97 publications

References 57 publications

Fluorescent‐Labeled Octasilsesquioxane Nanohybrids as Potential Materials for Latent Fingerprinting Detection

Fluorescent‐Labeled Octasilsesquioxane Nanohybrids as Potential Materials for Latent Fingerprinting Detection

Design Principles and Material Engineering of ZnS for Optoelectronic Devices and Catalysis

Over 1000‐Fold Enhancement of the Unidirectional Photoluminescence from a Microsphere‐Cavity‐Array‐Capped QD/PDMS Composite Film for Flexible Lighting and Displays

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