CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zuowei Zhang,Luoning Zhang,Jianjun Xu,Xian He,Baohua Yuan,Chao Chen,Cheng Zou,Qian Wang,Yanzi Gao,Meina Yu,Chuanbao Liu,Huai Yang
Polymer dispersed liquid crystal (PDLC) is a promising candidate for electrically controlled smart window applications because of its energy efficiency, convenience and other advantages. However, its flexibility and heat management capabilities are not effectively evaluated. Herein, a flexible dual-functional intelligent window based on PDLC composite is designed for this purpose, which integrates Ag nanowires as a transparent conductive electrode (TCE) and Tm 3+ /Yb 3+ -Cs x WO 3 (Tm 3+ /Yb 3+ -CWO) as a near-infrared shielding and air purification layer. Specifically, the as-made smart window can control the transmission of both visible and near-infrared light. Furtherly, it also possesses self-cleaning capability. A series of characterization has been carried out. The resistance of the Ag nanowire layer is measured to be 22.47 Ω/sq and the transmittance reaches 78.8 %. Flexibility test shows that when the bending radius is 4 mm, the resistance value of the TCE changes only 6 % after 500 repetitions, indicating good flexibility and stability. The spectrum examination reveals that the near-infrared light shielding efficiency achieves 80 % and the average transmittance of visible light is 76.7 %. The degradation of Rhodamine B (RhB) is used to evaluate the purification performance and result shows that the degradation percentage reaches 70 % in 120 min. Heat-regulation simulation test discloses that the indoor temperature can be decreased by 10 °C. Compared to traditional PDLC windows, the designed flexible window has broader application prospects in areas of architecture, vehicle glass, military stealth materials and so on.
研究领域:
材料科学
·
能源与环境工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Muge Shele,Fei-Yan Qi,Xin-Yu Tian,Yong-Sheng Bao,Menghe Baiyin
Three organic-decorated quaternary TM-Cd-Sb-Se (TM = Zn, Mn, Fe) compounds were prepared under tris (2-aminoethyl) amine conditions by solvent method, namely, [Zn(tren)] 2 CdSb 2 Se 6 ( 1 ), [Mn(tren)]CdSb 2 Se 5 ( 2 ) and [Fe(tren)]Cd 2 SbSe 5 ( 3 ) [tren = tris (2-aminoethyl) amine)]. The single-crystal X-ray diffraction analyses showed that the three compounds structures were 0-D {[Zn(tren)] 2 CdSb 2 Se 6 } ( 1 ) cluster, 1-D {[Mn(tren)]CdSb 2 Se 5 } ( 2 ) ribbon and 2-D {[Fe(tren)]Cd 2 SbSe 5 } ( 3 ) layered. A series of characterizations of these compounds were performed, as estimated from the adsorption spectra, the band gaps of 1 , 2 and 3 are 2.09, 1.78 and 1.91eV, respectively. Photoluminescence experiments show that compounds 2 and 3 exhibit luminescent properties. And the thermal stability of these compounds was tested by thermogravimetric and differential scanning calorimetry .
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Xiuna Tian,Hongjian Dou,Youfeng Wen,Lingyuan Wu,Changjun Wang,Zongwei Zhang,Youzi Zhang
In the field of disease diagnosis and treatment, achieving highly sensitive temperature sensing via non-contact methods based on fluorescence continues to present a significant challenge. This study investigated the influence of the cross-relaxation (CR) process of Tm 3+ ions at varying concentrations and the negative thermal expansion (NTE) property of the matrix on the luminescent properties of Sc 2 (MoO 4 ) 3 :Yb 3+ /Tm 3+ materials under diverse temperature conditions, and further evaluated their potential application value in the field of temperature sensing. At room temperature, the analysis of the concentration dependence of the emission spectra reveals that the intensities of the emission peaks originating from higher energy levels ( 1 G 4 , 3 H 4 , and 3 H 5 ) and the lowest excited state ( 3 F 4 ) exhibit significant variation with the doping concentration. As the doping concentration increases, the temperature enhancement factor for the fluorescence intensity of high-energy level transition ( 1 G 4 → 3 H 6 ) progressively decreases from 21.6 to 1.2. In contrast, the temperature enhancement factor for the lowest excited state transition ( 3 F 4 → 3 H 6 ) markedly increases from 471 to 2964. At a concentration of 8%, the temperature extension factor of the fluorescence lifetime at 1627 nm ( 3 F 4 → 3 H 6 ) can reach 7.2, whereas at a concentration of 0.5%, this factor is 2.7. These suggests that the CR process between Tm 3+ ions exerts markedly distinct influences on the luminescence intensities and lifetime in Sc 2 (MoO 4 ) 3 :Yb 3+ /Tm 3+ materials. In addition, this study employs the fluorescence intensity ratio of I 1629 nm / I 1197 nm for temperature sensing, thereby achieving high sensitivity in temperature measurement.
研究领域:
光学材料
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发光材料
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温度传感
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固体物理
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sen Yang,Yinghao Wei,Qi Wang,Zhijun Sun,Ai-Hua Li
Lead-free double perovskites have superb luminescence properties for broad applications. However, increasing or improving near-infrared (NIR) photoluminescence (PL) is still a challenge. In this paper, a high-performance microcrystal is designed based on Tm 3+ heavily doped Cs 2 Ag 0.6 Na 0.4 In 0.9 Bi 0.1 Cl 6 (CANIBC), which realize both the self-trapped excitons (STEs) and Tm 3+ NIR emission. The emission mechanism and energy transfer (ET) process are studied by steady-state and time-resolved PL spectra. The ET efficiency from STEs to Tm 3+ can reach 38.3 %, and the NIR PL quantum yield of Tm 3+ can reach 22.7 %. Meanwhile, the PL spectra of Tm 3+ -doped CANIBC microcrystals (MCs) with different concentrations are used to investigate their temperature sensing properties based on both fluorescence intensity ratio (FIR) and lifetime. Based on the FIR, relative sensitivity ( S r ) can reach 2.93 % K −1 at 303 K. Moreover, based on lifetimes, S r can maintain more than 1.55 % K −1 from 303 to 453 K, and maximum S r can also achieve 2.38 % K −1 at 360 K. These excellent luminescence and sensing properties offer greater development potential in the field of NIR phosphor and thermometry.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Yixiao Zheng,Wen Zhang,Guanghui Chen,Lin Zong,Yilun Yang,Jingtao Xin,Lianqing Zhu
2 μm laser systems offer superior eye safety and wide-ranging applications in remote sensing, biomedical fields, and industrial applications. The increasing demand for high-power 2 μm lasers faces challenges from thermal instability at fiber splice points during high-power operation. To address this, a novel Tm–Sn codoped fiber combining photosensitivity and gain properties through modified chemical vapor deposition and liquid-phase doping is developed. The fabricated fiber features a core/cladding diameter of 9.03/125.50 μm with 0.54 μm concentricity, demonstrating a refractive index fluctuation of 2.591 × 10 − 3 and Tm 2 O 3 concentration of 2.70 wt%. Characterization by Raman and fluorescence spectroscopy confirms successful Tm–Sn codoping. The fiber shows exceptional compatibility with standard single-mode fibers (0.04 dB splice loss) and enhanced photosensitivity, achieving a refractive index change of 6.75 × 10 − 5 under 248 nm UV exposure—surpassing Ge-doped fibers by 3 × 10 − 5 . This innovative design enables integrated gain medium-resonator structures without fusion splices, providing a robust solution for high-power 2 μm laser development. The fiber's unique combination of optical properties addresses critical thermal stability issues while maintaining performance efficiency.
研究领域:
光学工程
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光纤通信
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激光技术
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生物医学光子学
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材料科学
·
集成光子学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-9
·
IF 2.983
Han Zhanwen,Yu Hongquan,Tian Zhuang,Zhang Jinsu,Sun Jiashi,Li Xiangping,Xu Sai,Chen Baojiu
The lanthanide-based white light-emitting diodes excited by irradiation at a wavelength of 980 nm have attracted increasing attention because of their low photon frequency and ease of implementation. Here, we report on warm, white, Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes prepared by a simple single-needle electrospinning method. The Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes have an outer diameter of about 180 nm, and a wall thickness of 36 nm. Their color coordinates and chromaticity were controlled to yellow → red → warm white by adjusting the Tm 3+ concentration from 0.5 to 2.0%. The luminescence properties and upconversion mechanism of Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes were investigated. The warm white Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes exhibit a strong correlated color temperature to a household incandescent lamp.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 61
·35306-35313
·
IF 2.936
Pengpeng Feng,Yusong Pan,Hui Ye
NaYF4:Yb,Tm upconversion nanocrystals with hexagonal structure possess excellent photoluminescence emission characteristics. Under near infrared (NIR) light irradiation, the Yb3+ ions act as sensitizers to absorb the NIR light and transform NIR light into ultraviolet (UV) and visible (Vis) light continuously. Hybrid NIR-activated photocatalysts can be fabricated by combining upconversion nanocrystals with various semiconductor nanocrystals. In this paper, NaYF4:Yb,Tm micro-rods were hydrothermally synthesized with oleic acid as capping ligand. The NaYF4:Yb,Tm@CdS composite was fabricated by in situ generation of CdS nanoclusters on the surface of NaYF4:Yb,Tm micro-rods. The morphologies and structures of NaY4:Yb,Tm and NaYF4:Yb,Tm@CdS were characterized by XRD, SEM, TEM, XPS, UV-Vis and PL spectroscopy. The results of photocatalytic experiments indicated that the NaYF4:Yb,Tm@CdS composite displayed photocatalytic activity under NIR irradiation. In comparison with pure CdS, the photocatalytic ability of NaYF4:Yb,Tm@CdS composite under Vis-NIR irradiation was obviously enhanced. 82% of RhB was degraded by NaYF4:Yb,Tm@CdS catalyst within 75 min under Vis-NIR irradiation, which was more effective than pure CdS (65% degradation of RhB).
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Catalysis
·
2025
·
IF 44.6
Lu Xiaojun,Wu Jiazhen,He Xinyi,Li Zichuang,Lu Yangfan,Li Wenqian,Li Jiang,Xu Miao,Qi Yanpeng,Zhang Qing,Liu Yijia,Du Meng,Kamiya Toshio,Hosono Hideo,Pan Fusheng,Chen Jie-Sheng,Ye Tian-Nan
Metal single-atom catalysts offer improved activity and selectivity due to their unique electronic and coordination properties compared with bulk metals. However, many single-atom catalysts suffer from randomly dispersed active sites and limited electron-donating ability due to bonding with electronegative elements or less reactive metals. Here we demonstrate that Mg-rich intermetallic Mg 29 TM 4 (TM = Pd, Rh, Ir, Pt) nanocatalysts overcome these limitations. These materials feature periodically dispersed, electron-rich single-atom sites of noble metals within a uniform chemical environment. Mg 29 TM 4 exhibits high activity and selectivity in C 2 H 2 semihydrogenation (Mg 29 Pd 4 ) and olefin hydroformylation (Mg 29 Rh 4 ), with Mg 29 Rh 4 achieving high regioselectivity for branched aldehydes (branched:linear > 200:1). Kinetic and density functional theory studies suggest that the Mg–TM ensemble enables precise control over carbon–carbon multiple bond adsorption and activation, enhancing both activity and selectivity. Furthermore, the ternary Mg 29 Pd 1.3 Rh 2.7 catalyst, with its synergistic Mg–Pd and Mg–Rh dual single-atom sites, efficiently catalyses a cascade reaction involving phenylacetylene hydrogenation followed by hydroformylation.
研究领域:
化学
·
催化科学
·
材料科学
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产品关联
DOI
高影响因子
JACS Au
·
2023
·
IF 8
Ping Liang,Yihao Zheng,Fengru Liu,Huaiyu Shao,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yingliang Liu,Jianle Zhuang,Xingcai Zhang
Carbon dot (CD)-based luminescent materials have attracted great attention in optical anti-counterfeiting due to their excellent photophysical properties in response to ultraviolet-to-visible excitation. Hence, there is an urgent need for the general synthesis of CD-based materials with multimode luminescence properties and high stability; however, their synthesis remains a formidable challenge. Herein, CDs were incorporated into a Yb,Tm-doped YF3 matrix to prepare CDs@YF3:Yb,Tm composites. The YF3 plays a dual role, not only serving as a host for fixing rare earth luminescent centers but also functioning as a rigid matrix to stabilize the triplet state of the CDs. Under the excitation of 365 nm ultraviolet light and 980 nm near-infrared light, CDs@YF3:Yb,Tm exhibited blue fluorescence and green room-temperature phosphorescence of CDs and upconversion luminescence of Tm3+, respectively. Due to the strong protection of the rigid matrix, the stability of CDs@YF3:Yb,Tm is greatly improved. This work provides a general synthesis strategy for achieving multimode luminescence and high stability of CD-based luminescent materials and offers opportunities for their applications in advanced anti-counterfeiting and information encryption.
研究领域:
材料科学
·
光学材料
·
纳米技术
·
防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Han Xia,Lei Lei,Jienan Xia,Youjie Hua,Degang Deng,Shiqing Xu
Non-contact optical thermometry based on fluorescence intensity ratio (FIR) technique has been widely researched over the past few decades. However, the reported systems exhibit two important shortcomings including the existence of a few interferential signals in addition to the required spectral bands for FIR and the absence of internal standard for reference signal. Herein, only two emission bands of Er 3+ : 4 F 9/2 → 4 I 15/2 (~673 nm) and Tm 3+ : 3 H 4 → 3 H 6 (~800 nm) are achieved in Yb/Er/Tm tri-doped Na 3 ZrF 7 nano-system. Moreover, the upconversion (UC) emission intensity of Er 3+ keeps unchanged with the rising of temperature, which is applied as reference signal; while that of Tm 3+ enhances evidently, which is applied as temperature signal. The calculated maximum absolute temperature sensitivity (S a ) and relative temperature sensitivity (S r ) are 0.17 K −1 at 393 K and 1.76% K −1 at 313 K, respectively.
研究领域:
材料科学
·
纳米技术
·
光学
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Yinyin Chen,Xinying She,Zhouping Yang,Changfang Lu,Wei Zhang,Dongju Feng,Wei Wu,Xianxiang Wang
Doxorubicin hydrochloride (DOX), an anthraquinone-based antibiotic, is widely used in human tumors treatment. However, the residues of DOX in body would pose a threat to the health of heart and liver. Herein, a photochemical sensor NaYF 4 :Yb/Tm@NaYF 4 :Yb-Cit-CD (UCNPs) for detecting DOX has been developed in this paper. The fluorescence emission spectrum of UCNPs under 980 nm laser excitation has a wide range overlap with UV–vis absorption spectrum of DOX. Therefore, the fluorescence emission of UCNPs at 480 nm can be quenched by DOX. The UCNPs sensor has displayed a linear range of 0.05–20 μg/mL with a detection limit (LOD) of 0.005 μg/mL for DOX. Furthermore, the results of recovery for DOX in human serum samples is 98.68–104.20% and in accord with those obtained by HPLC and UV–vis.
研究领域:
生物医学工程
·
药物分析
·
纳米技术
✓ 已验证
DOI
高影响因子
LASER PHYSICS LETTERS
·
2017
·Vol. 14
·期 11
·110002
·
IF 2.537
Yongfeng Luo,Yan Zhou,Yulong Tang,Jianqiu Xu,Chenxia Hu,Linfeng Gao,Haoli Zhang,Qiang Wang
Solution based nanosheets of iron-doped graphitic carbon nitrides (Fe-g-CN) have been prepared and their optical properties (both linear and nonlinear) are studied. These two-dimensional (2D) nanosheets show an absorption spectrum extending to over 2 µm, and in particular they possess strong nonlinear (saturable) absorption in the 2 µm spectral region. A saturable absorber (SA) manufactured from 2D Fe-g-CN nanosheets gives a modulation depth and saturation intensity of 12.9% and 8.9 MW cm−2, respectively. This SA is further used to mode-lock thulium-doped fiber lasers, producing 2 µm laser pulses with a duration of 16.6 ps (dechirped to 2.2 ps), an average power of 96.4 mW, a pulse energy of 6.3 nJ, and a repetition rate of 15.3 MHz. As a new type of 2D nonlinear material with strong modulation capabilities, solution-based Fe-g-CN nanosheets can be potentially integrated into photonic and optoelectrionic devices, particuarly in the 2 µm spectral region.
研究领域:
光学
·
材料科学
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）