The Experts below are selected from a list of 12759 Experts worldwide ranked by ideXlab platform
Daqin Chen - One of the best experts on this subject based on the ideXlab platform.
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Glass limited yb er naluf4 nanocrystals reversible hexagonal to cubic phase transition and anti counterfeiting
Journal of Materials Chemistry C, 2020Co-Authors: Shaoxiong Wang, Jidong Lin, Jiangkun Chen, Changbin Yang, Ping Huang, Yao Cheng, Daqin ChenAbstract:The development of luminescent materials with concurrent tunable spectral profile and brightness is a great challenge to improve the security of the authentic items and shield against counterfeiting. Herein, we report the realization of in situ hexagonal-to-cubic phase transition of Yb/Er:NaLuF4 nanocrystals inside Inorganic Glass via simply modifying the heating (Glass crystallization) temperature, leading to simultaneous control of upconversion emission color and intensity. Impressively, this peculiar phase transition process is reversible upon cyclic heating/cooling thermal-treatment and the accompanying repeatable upconversion emission behaviors are retained. It is experimentally demonstrated that multiple patterns visualized using screen-printing inks containing the investigated samples and the anti-counterfeiting prototypes are practically applicable by switching in situ Glass crystallization temperatures. These findings show great promise of the designed lanthanide-doped NaLuF4@Glass nanocomposites in high-level anticounterfeiting applications and give new insights for the development of advanced optical materials.
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robust cspbx3 x cl br and i perovskite quantum dot embedded Glasses nanocrystallization improved stability and visible full spectral tunable emissions
Journal of Materials Chemistry C, 2018Co-Authors: Daqin Chen, Jiangkun Chen, Shuo Yuan, Jiasong ZhongAbstract:Currently, all Inorganic perovskite quantum dots (QDs) of cesium lead halides (CsPbX3, X = Cl, Br, and I) have been mainly fabricated using wet chemical methods. Unfortunately, applications of perovskite QDs have been limited due to their poor stability. In the present work, the in situ growth of whole-family CsPbX3 (X = Cl, Br, and I) perovskite QDs in Zn–P–B–Sb based oxide Glass via a Glass crystallization strategy is reported. The as-prepared CsPbX3 QDs@Glass nanocomposites exhibit typical excitonic recombination emissions and superior chemical stability benefited from the protection of the robust Inorganic Glass matrix. Through modifying the molar ratio of halide sources in Glass, multi-color tunable emissions in the entire visible spectral range of 400–750 nm are achieved. As a result, light-emitting diode devices can be constructed by coupling blue-emissive CsPbBrCl2, green-emissive CsPbBr3 and red-emissive CsPbBr0.5I2.5 QDs@Glass powders with a commercial ultraviolet chip, yielding bright white light luminescence with excellent optoelectronic performance.
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enhanced luminescence of mn4 y3al5o12 red phosphor via impurity doping
Journal of Materials Chemistry C, 2016Co-Authors: Daqin Chen, Jiasong Zhong, Yang Zhou, Weidong XiangAbstract:Currently, white light-emitting-diodes converted using Ce3+:Y3Al5O12 phosphor suffer from the shortage of red component and the easy aging of the organic silicone binder. Herein, a novel and non-rare-earth doped Mn4+:Y3Al5O12 red phosphor was synthesized by a traditional solid-state reaction. This phosphor can emit red luminescence attributed to Mn4+:2E → 4A2 spin-forbidden transition in the 600–700 nm spectral region and can be efficiently excited by both the commercially available near-ultraviolet and blue chips. Impressively, Mg2+, Ca2+, and Ge4+ dopants were found to be beneficial for enhancing Mn4+ luminescence, and the related mechanisms were systematically discussed. Furthermore, Mn4+:Y3Al5O12 embedded Inorganic Glass ceramic was successfully fabricated to replace the phosphor in organic silicone as the color converter, and a stacking geometric configuration by sequentially coupling a Ce3+:Y3Al5O12 Glass ceramic and a Mn4+:Y3Al5O12 Glass ceramic with an InGaN blue chip was designed to explore its possible application in warm white light-emitting diodes.
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Advances in transparent Glass-ceramic phosphors for white light-emitting diodes-A review
Journal of the European Ceramic Society, 2015Co-Authors: Daqin Chen, Mingye Ding, Xiaojuan Liang, Jiasong Zhong, Weidong Xiang, Hongwei Lu, Hua Yu, Zhenguo JiAbstract:Currently, the major commercial white light-emitting diode is the phosphor converted LED made of blue-emitting chip and Y3Al5O12:Ce3+yellow phosphor dispersed in organic silicone. However, the organic binder in high-power device ages easily and turns yellow due to accumulated heat emitted from chip, which adversely affects the device properties such as luminous efficacy and color coordination, and therefore reduces its long-term reliability as well as lifetime. In this mini-review article, we provide an overview of recent progresses in developing transparent Inorganic Glass-ceramics phosphors excitable by blue chip, as an alternative to conventional polymer-based phosphor converter, for construction of high-power white light-emitting diodes. Two kinds of synthesis routes, Glass crystallization and low-temperature co-sintering, are discussed in detail. Afterwards, the materials design, structure/property optimization as well as Glass-ceramic-based WLED devices construction are summarized. Finally, challenges and future advances for the realization of transparent Glass-ceramics in commercial applications will be presented.
Xiaoping Yang - One of the best experts on this subject based on the ideXlab platform.
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flexible fiber reinforced composites with improved interfacial adhesion by mussel inspired polydopamine and poly methyl methacrylate coating
Materials Science and Engineering: C, 2016Co-Authors: Hongyang Sun, Hongcheng Zhang, Xuliang Deng, Qing Cai, Xiaoping YangAbstract:To obtain a kind of light-curable fiber-reinforced composite for dental restoration, an excellent interfacial adhesion between the fiber and the acrylate resin matrix is quite essential. Herein, surface modification on Glass fibers were carried out by coating them with poly(methyl methacrylate) (PMMA), polydopamine (PDA), or both. The PMMA or PDA coating was performed by soaking fibers in PMMA/acetone solution or dopamine aqueous solution. PDA/PMMA co-coated Glass fibers were obtained by further soaking PDA-coated fibers in PMMA/acetone solution. These modified fibers were impregnated with bisphenol A glycidyl methacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) (5:5, w/w) dental resin at a volume fraction of 75%, using unmodified fibers as reference. Light-cured specimens were submitted to evaluations including flexural properties, morphological observation, dynamic mechanical thermal analysis (DMTA) and pull-out test. In comparison with unmodified Glass fibers, all the modified Glass fibers showed enhancements in flexural strength and modulus of Bis-GMA/TEGDMA resin composites. Results of DMTA and pull-out tests confirmed that surface modification had significantly improved the interfacial adhesion between the Glass fiber and the resin matrix. Particularly, the PDA/PMMA co-coated Glass fibers displayed the most efficient reinforcement and the strongest interfacial adhesion due to the synergetic effects of PDA and PMMA. It indicated that co-coating method was a promising approach in modifying the interfacial compatibility between Inorganic Glass fiber and organic resin matrix.
Yang Xiaoping - One of the best experts on this subject based on the ideXlab platform.
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Flexible fiber-reinforced composites with improved interfacial adhesion by mussel-inspired polydopamine and poly(methyl methacrylate) coating
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS, 2016Co-Authors: Sun Hongyang, Zhang Hongcheng, Deng Xuliang, Cai Qing, Yang XiaopingAbstract:To obtain a kind of light-curable fiber-reinforced composite for dental restoration, an excellent interfacial adhesion between the fiber and the acrylate resin matrix is quite essential. Herein, surface modification on Glass fibers were carried out by coating them with poly(methyl methacrylate) (PMMA), polydopamine (PDA), or both. The PMMA or PDA coating was performed by soaking fibers in PMMA/acetone solution or dopamine aqueous solution. PDA/PMMA co-coated Glass fibers were obtained by further soaking PDA-coated fibers in PMMA/acetone solution. These modified fibers were impregnated with bisphenol A glycidyl methacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) (5:5, w/w) dental resin at a volume fraction of 75%, using unmodified fibers as reference. Light-cured specimens were submitted to evaluations including flexural properties, morphological observation, dynamic mechanical thermal analysis (DMTA) and pull-out test. In comparison with unmodified Glass fibers, all the modified Glass fibers showed enhancements in flexural strength and modulus of Bis-GMA/TEGDMA resin composites. Results of DMTA and pull-out tests confirmed that surface modification had significantly improved the interfacial adhesion between the Glass fiber and the resin matrix. Particularly, the PDA/PMMA co-coated Glass fibers displayed the most efficient reinforcement and the strongest interfacial adhesion due to the synergetic effects of PDA and PMMA. It indicated that co-coating method was a promising approach in modifying the interfacial compatibility between Inorganic Glass fiber and organic resin matrix. (C) 2015 Elsevier B.V. All rights reserved.National Natural Science Foundation of China [51373016]; Beijing Municipal Commission of Education [ZDZH20141001001]SCI(E)EIPubMedARTICLEkqdengxuliang@bjmu.edu.cn; caiqing@mail.buct.edu.cn742-7495
Jiasong Zhong - One of the best experts on this subject based on the ideXlab platform.
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robust cspbx3 x cl br and i perovskite quantum dot embedded Glasses nanocrystallization improved stability and visible full spectral tunable emissions
Journal of Materials Chemistry C, 2018Co-Authors: Daqin Chen, Jiangkun Chen, Shuo Yuan, Jiasong ZhongAbstract:Currently, all Inorganic perovskite quantum dots (QDs) of cesium lead halides (CsPbX3, X = Cl, Br, and I) have been mainly fabricated using wet chemical methods. Unfortunately, applications of perovskite QDs have been limited due to their poor stability. In the present work, the in situ growth of whole-family CsPbX3 (X = Cl, Br, and I) perovskite QDs in Zn–P–B–Sb based oxide Glass via a Glass crystallization strategy is reported. The as-prepared CsPbX3 QDs@Glass nanocomposites exhibit typical excitonic recombination emissions and superior chemical stability benefited from the protection of the robust Inorganic Glass matrix. Through modifying the molar ratio of halide sources in Glass, multi-color tunable emissions in the entire visible spectral range of 400–750 nm are achieved. As a result, light-emitting diode devices can be constructed by coupling blue-emissive CsPbBrCl2, green-emissive CsPbBr3 and red-emissive CsPbBr0.5I2.5 QDs@Glass powders with a commercial ultraviolet chip, yielding bright white light luminescence with excellent optoelectronic performance.
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enhanced luminescence of mn4 y3al5o12 red phosphor via impurity doping
Journal of Materials Chemistry C, 2016Co-Authors: Daqin Chen, Jiasong Zhong, Yang Zhou, Weidong XiangAbstract:Currently, white light-emitting-diodes converted using Ce3+:Y3Al5O12 phosphor suffer from the shortage of red component and the easy aging of the organic silicone binder. Herein, a novel and non-rare-earth doped Mn4+:Y3Al5O12 red phosphor was synthesized by a traditional solid-state reaction. This phosphor can emit red luminescence attributed to Mn4+:2E → 4A2 spin-forbidden transition in the 600–700 nm spectral region and can be efficiently excited by both the commercially available near-ultraviolet and blue chips. Impressively, Mg2+, Ca2+, and Ge4+ dopants were found to be beneficial for enhancing Mn4+ luminescence, and the related mechanisms were systematically discussed. Furthermore, Mn4+:Y3Al5O12 embedded Inorganic Glass ceramic was successfully fabricated to replace the phosphor in organic silicone as the color converter, and a stacking geometric configuration by sequentially coupling a Ce3+:Y3Al5O12 Glass ceramic and a Mn4+:Y3Al5O12 Glass ceramic with an InGaN blue chip was designed to explore its possible application in warm white light-emitting diodes.
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Advances in transparent Glass-ceramic phosphors for white light-emitting diodes-A review
Journal of the European Ceramic Society, 2015Co-Authors: Daqin Chen, Mingye Ding, Xiaojuan Liang, Jiasong Zhong, Weidong Xiang, Hongwei Lu, Hua Yu, Zhenguo JiAbstract:Currently, the major commercial white light-emitting diode is the phosphor converted LED made of blue-emitting chip and Y3Al5O12:Ce3+yellow phosphor dispersed in organic silicone. However, the organic binder in high-power device ages easily and turns yellow due to accumulated heat emitted from chip, which adversely affects the device properties such as luminous efficacy and color coordination, and therefore reduces its long-term reliability as well as lifetime. In this mini-review article, we provide an overview of recent progresses in developing transparent Inorganic Glass-ceramics phosphors excitable by blue chip, as an alternative to conventional polymer-based phosphor converter, for construction of high-power white light-emitting diodes. Two kinds of synthesis routes, Glass crystallization and low-temperature co-sintering, are discussed in detail. Afterwards, the materials design, structure/property optimization as well as Glass-ceramic-based WLED devices construction are summarized. Finally, challenges and future advances for the realization of transparent Glass-ceramics in commercial applications will be presented.
Joseramon Sarasua - One of the best experts on this subject based on the ideXlab platform.
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novel hydrogels of chitosan and poly vinyl alcohol reinforced with Inorganic particles of bioactive Glass
Polymers, 2021Co-Authors: O Sanchezaguinagalde, Ainhoa Lejardi, Emilio Meaurio, Rebeca Hernandez, Carmen Mijangos, Joseramon SarasuaAbstract:Chitosan (CS) and poly(vinyl alcohol) (PVA) hydrogels, a polymeric system that shows a broad potential in biomedical applications, were developed. Despite the advantages they present, their mechanical properties are insufficient to support the loads that appear on the body. Thus, it was proposed to reinforce these gels with Inorganic Glass particles (BG) in order to improve mechanical properties and bioactivity and to see how this reinforcement affects levofloxacin drug release kinetics. Scanning electron microscopy (SEM), X-ray diffraction (XRD), swelling tests, rheology and drug release studies characterized the resulting hydrogels. The experimental results verified the bioactivity of these gels, showed an improvement of the mechanical properties and proved that the added bioactive Glass does affect the release kinetics.