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  • 1
    Online Resource
    Online Resource
    Thermal Enhancement of Upconversion by Negative Lattice Expansion in Orthorhombic Yb 2 W 3 O 12
    Wiley ; 2019
    In:  Angewandte Chemie Vol. 131, No. 48 ( 2019-11-25), p. 17415-17419
    Details
    In: Angewandte Chemie, Wiley, Vol. 131, No. 48 ( 2019-11-25), p. 17415-17419
    Abstract: Thermal quenching of photoluminescence represents a significant obstacle to practical applications such as lighting, display, and photovoltaics. Herein, a novel strategy is established to enhance upconversion luminescence at elevated temperatures based on the use of negative thermal expansion host materials. Lanthanide‐doped orthorhombic Yb 2 W 3 O 12 crystals are synthesized and characterized by in situ X‐ray diffraction and photoluminescence spectroscopy. The thermally induced contraction and distortion of the host lattice is demonstrated to enhance the collection of excitation energy by activator ions. When the temperature is increased from 303 to 573 K, a 29‐fold enhancement of green upconversion luminescence in Er 3+ activators is achieved. Moreover, the temperature dependence of the upconversion luminescence is reversible. The thermally enhanced upconversion is developed as a sensitive ratiometric thermometer by referring to a thermally quenched upconversion.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v131.48
    DOI: 10.1002/ange.201910277
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2019
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  • 2
    Online Resource
    Online Resource
    Do the cations in clay and the polymer matrix affect quantum dot fluorescent properties?
    Wiley ; 2016
    In:  Luminescence Vol. 31, No. 4 ( 2016-06), p. 1020-1024
    Details
    In: Luminescence, Wiley, Vol. 31, No. 4 ( 2016-06), p. 1020-1024
    Abstract: This paper studied the effects of cations and polymer matrix on the fluorescent properties of quantum dots (QDs). The results indicated that temperature has a greater impact on fluorescence intensity than clay cations (mainly K + and Na + ). Combined fluorescence lifetime and steady‐state spectrometer tests showed that QD lifetimes all decreased when the cation concentration was increased, but the quantum yields were steady at various cation concentrations of 0, 0.05, 0.5 and 1 M. Poly(ethylene oxide) (PEO), poly(vinyl alcohol) (PVA) and diepoxy resin were used to study the effects of polymers on QD lifetime and quantum yield. The results showed that the lifetime for QDs 550 nm in PEO and PVA was 17.33 and 17.12 ns, respectively; for the epoxy resin, the lifetime was 0.74 ns, a sharp decrease from 24.47 ns. The quantum yield for QDs 550 nm changed from 34.22% to 7.45% and 7.81% in PEO and PVA, respectively; for the epoxy resin the quantum yield was 2.25%. QDs 580 nm and 620 nm showed the same results as QDs 550 nm. This study provides useful information on the design, synthesis and application of QDs–polymer luminescent materials. Copyright © 2015 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 1522-7235 , 1522-7243
    URL: Issue
    URL: Article
    DOI: 10.1002/bio.v31.4
    DOI: 10.1002/bio.3068
    Language: English
    Publisher: Wiley
    Publication Date: 2016
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    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Thermal Enhancement of Upconversion by Negative Lattice Expansion in Orthorhombic Yb 2 W 3 O 12
    Wiley ; 2019
    In:  Angewandte Chemie International Edition Vol. 58, No. 48 ( 2019-11-25), p. 17255-17259
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 58, No. 48 ( 2019-11-25), p. 17255-17259
    Abstract: Thermal quenching of photoluminescence represents a significant obstacle to practical applications such as lighting, display, and photovoltaics. Herein, a novel strategy is established to enhance upconversion luminescence at elevated temperatures based on the use of negative thermal expansion host materials. Lanthanide‐doped orthorhombic Yb 2 W 3 O 12 crystals are synthesized and characterized by in situ X‐ray diffraction and photoluminescence spectroscopy. The thermally induced contraction and distortion of the host lattice is demonstrated to enhance the collection of excitation energy by activator ions. When the temperature is increased from 303 to 573 K, a 29‐fold enhancement of green upconversion luminescence in Er 3+ activators is achieved. Moreover, the temperature dependence of the upconversion luminescence is reversible. The thermally enhanced upconversion is developed as a sensitive ratiometric thermometer by referring to a thermally quenched upconversion.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v58.48
    DOI: 10.1002/anie.201910277
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2019
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  • 4
    Online Resource
    Online Resource
    One‐Step Synthesis of Mixed Lanthanide Metal–Organic Framework Films for Sensitive Temperature Mapping
    Wiley ; 2019
    In:  Advanced Optical Materials Vol. 7, No. 19 ( 2019-10)
    Details
    In: Advanced Optical Materials, Wiley, Vol. 7, No. 19 ( 2019-10)
    Abstract: Mixed lanthanide metal–organic framework (LnMOF) films are directly grown on a quartz substrate through a wet chemical synthesis. Thermometric properties of the LnMOF films originating from temperature dependent emission intensity ratio of Tb/Eu are systematically investigated in the 298–383 K range. At an optimized Tb/Eu concentration ratio of 98.0:2.0, the ratiometric thermometer registers a high relative sensitivity of 16.14% K −1 at 359 K. As the temperature increases from 298 to 383 K, the LnMOF film thermometer also displays a distinct change in emission color from green to red, corresponding to a shift in Commission International de l'Eclairage (CIE) chromaticity coordinates from (0.3882, 0.5271) to (0.5459, 0.4037). The colorimetric property of the LnMOF film thermometer is exploited for real‐time temperature mapping with a high sensitivity.
    Type of Medium: Online Resource
    ISSN: 2195-1071 , 2195-1071
    URL: Issue
    URL: Article
    DOI: 10.1002/adom.v7.19
    DOI: 10.1002/adom.201900336
    Language: English
    Publisher: Wiley
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    Flexible transparent flame‐retardant membrane based on a novel UV‐curable phosphorus‐containing acrylate
    Wiley ; 2018
    In:  Fire and Materials Vol. 42, No. 1 ( 2018-01), p. 99-108
    Details
    In: Fire and Materials, Wiley, Vol. 42, No. 1 ( 2018-01), p. 99-108
    Abstract: A novel phosphorus‐containing acrylate monomer (AOPA) was synthesized starting from 2‐methy‐2,5‐dioxo‐1,2‐oxaphospholane and hydroxyethyl acrylate. The structure of AOPA was characterized with FTIR and 1 H NMR. AOPA shows good compatibility with polyethylene glycol diacrylate (PEGDA) and can polymerize with PEGDA under UV light irradiation at different mass ratios to form membranes with high transparency (above 88.9% of light transmittance in the range of 400‐800 nm) and flexibility. Incorporating 20 wt% of AOPA in PEGDA reduced the total heat release and peak rate by 50.3% and 38.4%, respectively, as measured by micro combustion calorimeter. The membrane containing 40 wt% of AOPA with 0.4 mm thickness can pass the UL94 V0 rating, and limiting oxygen index reaches 33.4%. TG‐FTIR and SEM‐EDX analysis show that the presence of AOPA depresses the thermal degradation and promotes the char formation.
    Type of Medium: Online Resource
    ISSN: 0308-0501 , 1099-1018
    URL: Issue
    URL: Article
    DOI: 10.1002/fam.v42.1
    DOI: 10.1002/fam.2461
    Language: English
    Publisher: Wiley
    Publication Date: 2018
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  • 6
    Online Resource
    Online Resource
    Association between birth weight and the risk of chronic kidney disease in men and women: Findings from a large prospective cohort study
    Wiley ; 2023
    In:  Medicine Advances Vol. 1, No. 1 ( 2023-03), p. 44-52
    Details
    In: Medicine Advances, Wiley, Vol. 1, No. 1 ( 2023-03), p. 44-52
    Abstract: The sex‐specific associations between birth weight and the risk of chronic kidney disease (CKD) later in life remain controversial. This study aimed to examine the shape of the relationship between birth weight and the risk of CKD in men and women. Methods A total of 277,252 participants free of CKD at baseline from the United Kingdom Biobank (UKB) prospective cohort were included in the analysis. Cox proportional hazard regression model was used to estimate the association between birth weight and the risk of incident CKD with adjustment for potential confounders. Results During a median follow‐up of 11.9 years, we identified 13,030 (4.7%) CKD cases. Compared with normal birth weight (2.5–4.0 kg), low birth weight (LBW, 〈 2.5 kg) was associated with an 11% higher risk of CKD in men (adjusted hazard ratio [HR]: 1.11 [95% CI 1.01–1.21] ) and a 27% higher risk of CKD in women (HR: 1.27 [1.19–1.36]) ( p for interaction = 0.02). High birth weight (HBW, 〉 4.0 kg) was associated with an 11% lower risk of CKD (HR: 0.89 [0.83–0.95]) in men but not in women (HR: 0.96 [0.89–1.04] ) ( p for interaction = 0.13). Furthermore, the LBW‐CKD association was stronger in obese (HR: 1.28 [1.18–1.39]) than in nonobese participants (HR: 1.16 [1.09–1.24] , p for interaction = 0.03). Conclusions We found an L‐shaped relationship between birth weight and the risk of CKD in women but a linear shape in men. The LBW‐CKD association was mitigated to some extent by maintaining healthy body weight in adulthood. Our findings support the notion that the CKD risk should be managed from a lifecycle perspective.
    Type of Medium: Online Resource
    ISSN: 2834-4405 , 2834-4405
    URL: Issue
    URL: Article
    DOI: 10.1002/med4.v1.1
    DOI: 10.1002/med4.8
    Language: English
    Publisher: Wiley
    Publication Date: 2023
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