Excitation-wavelength-dependent photoluminescence of silicon nanoparticles enabled by adjustment of surface ligands

Shen, Xiong; Song, Bin; Fang, Bei; Jiang, Airui; Ji, Shun‐Jun; He, Yao

doi:10.1039/c8cc00047f

Cited by 35 publications

(28 citation statements)

References 23 publications

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“…As shown in Figure 4b, the samples emitted visible light at P 1~4 85 nm, P 2~5 30 nm, P 3~5 45 nm, and P 4~5 73 nm. The strong P 1 emission is reported to emerge from the radiative optical transitions between the discrete energy states that are created at the Si-OH surface functional groups [66] (also see Figure 4c). The other peaks at P 2 , P 3 , and P 4 are also well known to arise from the radiative optical transitions between the energy states that are created by the surface functional groups of Si-O [67], Si-C [5], and Si-H [68,69], respectively.…”

Section: Optical Propertiesmentioning

confidence: 94%

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Lee

2021

Nanomaterials

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High-quality silicon (Si) nanocrystals that simultaneously had superior mesoporous and luminescent characteristics were derived from sticky, red, and brown rice husks via the facile and cost-effective magnesiothermic reduction method. The Si nanocrystals were confirmed to comprise an aggregated morphology with spherical nanocrystals (e.g., average sizes of 15–50 nm). Due to the surface functional groups formed at the nanocrystalline Si surfaces, the Si nanocrystals clearly exhibited multiple luminescence peaks in visible-wavelength regions (i.e., blue, green, and yellow light). Among the synthesized Si nanocrystals, additionally, the brown rice husk (BRH)-derived Si nanocrystals showed to have a strong UV absorption and a high porosity (i.e., large specific surface area: 265.6 m2/g, small average pore diameter: 1.91 nm, and large total pore volume: 0.5389 cm3/g). These are indicative of the excellent optical and textural characteristics of the BRH-derived Si nanocrystals, compared to previously reported biomass-derived Si nanocrystals. The results suggest that the biomass BRH-derived Si nanocrystals hold great potential as an active source material for optoelectronic devices as well as a highly efficient catalyst or photocatalyst for energy conversion devices.

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Section: Optical Propertiesmentioning

confidence: 94%

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Lee

2021

Nanomaterials

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“…The anti‐counterfeiting labels in multilevel luminescence anti‐counterfeiting can change more than two times under the regulation of excitation light, luminescence lifetime, heat stimuli, chemical reagents, mechanical force, and so on. Based on the category of regulation factors, multilevel luminescence anti‐counterfeiting can be divided into five types: (1) regulated by excitation light; [ 64–80 ] (2) co‐regulated by excitation light and luminescence lifetime; [ 81–92 ] (3) co‐regulated by excitation light and heat stimuli; [ 35,63,93–96 ] (4) co‐regulated by excitation light and chemical reagents; [ 16,97–105 ] and (5) co‐regulated by other factors. [ 106–121 ]…”

Section: Multilevel Luminescence Anti‐counterfeitingmentioning

confidence: 99%

Luminescence anti‐counterfeiting: From elementary to advanced

2021

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Luminescence anti‐counterfeiting derives from the easily changeable luminescence behaviors of luminescence materials under the regulation of various external stimuli (such as excitation light, chemical reagent, heat, and mechanical force, etc.) and luminescence lifetime, which plays an important role in preventing forgery of currency, artworks, and product brands. According to the numbers of changes of anti‐counterfeiting labels under various regulation conditions, luminescence anti‐counterfeiting can be classified into three levels from elementary to advanced: single‐level anti‐counterfeiting, double‐level anti‐counterfeiting, and multilevel anti‐counterfeiting. In this review, the recent achievements in luminescence anti‐counterfeiting are summarized, and the regulation of various factors to anti‐counterfeiting labels is discussed. Finally, existing problems, future challenges, and possible development directions are proposed in order to realize facile, quick, low‐cost, environmentally friendly, and difficult‐to‐replicate advanced luminescence anti‐counterfeiting.

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“…Silicon nanoparticles are advantageous in terms of their stability and biosafety, making them promising candidates in anticounterfeiting applications. A feasible method to control the photofluorescence of silicon nanoparticles is by tuning the excitation wavelength, which can be determined by the surfactant ligands . He and co‐workers modified the surface of silicon nanoparticles with nitrogen‐containing indole derivative molecules.…”

Section: Nanoparticles For Anticounterfeiting Applicationsmentioning

confidence: 99%

Optical Nanomaterials and Enabling Technologies for High‐Security‐Level Anticounterfeiting

et al. 2019

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by 2023 the global anticounterfeiting packaging market is projected to reach 208.4 billion USD. [9] The field of anticounterfeiting has a moving target. Initially, for example, almost every country implemented watermarks or fluorescence labels on banknotes to deter copying. [1] Nowadays, a broad range of optical nanomaterials, including metallic nanoparticles, organic dyes, semiconducting quantum dots, and lanthanide-doped nanoparticles (Figure 1) are available to be explored for developing next-generation anticounterfeiting technologies. Thanks to the rapid development of material science, wet-chemistry methods are available for highly controllable synthesis, allowing a large range of nanoparticles with distinguished optical features to be employed as anticounterfeiting taggants. Among them, lanthanide-doped upconversion nanoparticles (UCNPs) are outstanding for the feasibility to tune their optical properties in multiple dimensions. Here, we survey the recent progress in anticounterfeiting applications using new collections of optical nanomaterials as security inks and point out that UCNPs are one of the most promising candidates for high-security-level anticounterfeiting applications. [10] Moreover, we present an outlook for future trends in encryption and decryption devices and technologies toward their real-world adoptions. Nanoparticles for Anticounterfeiting ApplicationsGenerally, anticounterfeiting is done by verifying authentic information that can be either covert or overt. In a typical decoding process, the retrieved information may manifest itself as fluorescence color and intensity in patterns that are varying in the time and space domains. As a crucial element of anticounterfeiting technology, an encoding material serves as a carrier of distinct authentic information. [15] Hence, to achieve a high anticounterfeiting level, the encoding material should be able to offer abundant optical states that can be tailored to carry unique information. In this regard, nanoparticle materials (Table 1) have attracted tremendous interest owing to their exceptional stability, controllability, and diversity in tuning their optical properties in multiple dimensions, e.g., fluorescence color, intensity, and lifetime value. We surveyed and summarized several key fundamental optical features including reflection, absorption, scattering, and fluorescence that can be Optical nanomaterials have been widely used in anticounterfeiting applications. There have been significant developments powered by recent advances in material science, printing technologies, and the availability of smartphone-based decoding technology. Recent progress in this field is surveyed, including the availability of optical reflection, absorption, scattering, and luminescent nanoparticles. It is demonstrated that advances in the design and synthesis of lanthanide-doped upconversion nanoparticles will lead to the next generation of anticounterfeiting technologies. Their tunable optical properties and optical responses to a range of external stimuli a...

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Excitation-wavelength-dependent photoluminescence of silicon nanoparticles enabled by adjustment of surface ligands

Cited by 35 publications

References 23 publications

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Luminescence anti‐counterfeiting: From elementary to advanced

Optical Nanomaterials and Enabling Technologies for High‐Security‐Level Anticounterfeiting

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