JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 8
·8254-8270
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IF 1.798
Xi Junhua,Ding Mingye,Dai Jianbin,Pan Yajing,Chen Daqin,Ji Zhenguo
In this paper, Yb 3+ /Er 3+ co-doped hexagonal NaYF 4 have been successfully synthesized by solvothermal, thermal decomposition, hydrothermal and molten salt method, respectively. The crystal structures, particle morphologies, sizes and corresponding upconversion luminescent properties of β-NaYF 4 :Yb 3+ /Er 3+ nano/microcrystals are systemically studied. It is interesting to observed that the temperature-dependent UC luminescent properties of β-NaYF 4 :20 %Yb 3+ , 2 %Er 3+ samples are strongly related to their synthesis methods. Comparison of the upconversion luminescence and thermal sensitivity between the β-NaYF 4 :Yb 3+ /Er 3+ samples reveals that β-NaYF 4 :Yb 3+ /Er 3+ sub-microplates synthesized by thermal decomposition method have much stronger green emission intensity, better luminescent thermal stability and higher temperature sensitivity. This findings are relevant to the application of β-NaYF 4 :Yb 3+ /Er 3+ in optical temperature sensors and to the further understanding of the UC luminescent mechanism.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
·
IF 4.4
Kaiming Kan,Shujing Pan,Mengyu Zhang,Wenzhi Su,Yong Zou,Shoujun Ding
Monoclinic Yb 3+ /Er 3+ :KBi(MoO 4 ) 2 upconversion phosphors were synthesized by solid-state reaction method. • Lower symmetry induces stronger Stark splitting, enlarging ΔE ( 2 H 11/2 - 4 S 3/2 ) to 859 cm −1 . • The absolute optical temperature sensitivity is improved by ∼1.17× over the tetragonal counterpart. • The optical thermometric of the sample exhibits good reversibility and cycling stability. In this work, Yb 3+ /Er 3+ co-doped KBi(MoO 4 ) 2 (KBM) upconversion (UC) phosphors were successfully synthesized via high-temperature solid-state reaction. Structural characterization revealed that the as-prepared samples crystallize in a monoclinic phase, rather than the conventional tetragonal phase. Under 980 nm excitation, the samples exhibit the characteristic Er 3+ -based UC emissions, and optical thermometric behavior was investigated using the fluorescence intensity ratio (FIR) of the thermally coupled levels of Er 3+ ( 2 H 11/2 / 4 S 3/2 ). Owing to the lower symmetry of the monoclinic lattice, Stark splitting of lanthanide energy levels is enhanced. As a result, the effective energy gap between the thermally coupled levels is markedly enlarged from 506 cm −1 (tetragonal structure) to 859 cm −1 (monoclinic structure). Benefiting from the increased energy separation, the optical thermometric performance is significantly enhanced: the absolute sensitivity is improved by 1.17 times, while the relative sensitivity is increased by 1.75 times compared with the tetragonal counterpart. In addition, cyclic heating-cooling measurements demonstrate good reversibility and stability. By introducing monoclinic-phase KBM:Yb 3+ /Er 3+ phosphors, this work verifies the feasibility of enhancing thermally coupled-level-based optical thermometry in rare-earth double-molybdate systems via crystal-structure regulation, providing an effective strategy for developing high-sensitivity optical thermometric materials. Enlarge Er 3+ thermally coupled level splitting in monoclinic Yb 3+ /Er 3+ Co-doped KBi(MoO 4 ) 2 by structure modification to improving optical thermometry sensitivity. Download: Download high-res image (74KB) Download: Download full-size image
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JOURNAL OF LUMINESCENCE
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2022
·
IF 4.171
Boxu Xu,Chao Song,Jie Song,Rui Huang,Zhenxu Lin,Yi Zhang,Shaomin Lin,Jun Song
In this study, a series of well-crystallized Yb 3+ /Er 3+ /Tm 3+ -tridoped Y 2 O 3 –ZnO ceramic phosphors were prepared using sol–gel synthesis, and the phosphor structures were studied using X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis . The phosphors had excellent physical stability and porous structure. All phosphors generated blue, green, and red emission bands attributed to Tm: 1 G 4 → 3 H 6 , Er: 2 H 11/2 ( 4 S 3/2 )→ 4 I 15/2 , and Er: 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The emissions were intensified twice by tuning the Tm 3+ ratio in the host matrix Y 2 O 3 and ZnO parts. The color coordinates were adjusted by tuning both the Tm 3+ concentration and the excitation laser pump power to shift the color coordinates and only enhance the brightness, respectively. Meanwhile, heating phosphors can also linearly adjust the color coordinates of the luminescence. Therefore, it can also be used as a fluorescence thermometer in the field of temperature sensor . The study findings will broaden the phosphor practical application potential.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
·
IF 4.706
Hao Tang,Ying Xu,Xianhua Cheng
To investigate the optical properties of rare earth upconversion particle, the Cr 3+ and alkaline-earth ions (Mg 2+ or Ca 2+ ) co-doped β-NaYF 4 :Yb 3+ /Er 3+ upconversion microparticles (UCMPs) were synthesized via a facile hydrothermal method . The influences of co-doping ions and their concentrations on crystal structure, particle morphology and optical properties were thoroughly investigated by XRD , SEM , FT-IR spectra, UV–VIS-NIR absorption spectra and photoluminescence spectra. And the effects of the two kinds of impurity ions co-doping on the UC particle growth were studied. We found that luminescence quenching could be inhibited by using Cr 3+ and Mg 2+ co-doping due to the asymmetrical ion arrangement around activator. However, the Cr 3+ and Ca 2+ co-doping was found to quench the upconversion luminescence (UCL), and the possible mechanism was suggested. These discoveries lead to new insights into the quenching effect and new strategy to design UCMPs for better luminescence performance.
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高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Huazhen Liao,Song Ye,Yanling Shi,Deping Wang
Small size optical-magnetic bifunctional upconversion nanoparticles (UCNPs) that can be effectively triggered by 808 nm exhibit distinct advantages of improved tissue penetrating depth, minimized overheating effect, possible for multimodal imaging and high clearance rate, which therefore are considered as desirable candidates for bioapplications. In this research, the 808 nm triggered sub-20 nm β-NaYF 4 :Yb 3+ /Er 3+ @NaGdF 4 :Yb 3+ /Nd 3+ @NaGdF 4 active-core@active-shell@inert-shell structured UCNPs with optical and magnetic bifunctional properties were developed by seed-mediated growth method with NaOA as sodium source instead of the generally used NaOH. Through optimizing Nd 3+ doping concentration and outermost NaGdF 4 inert-shell thickness, the optical-magnetic bifunctional core-shell-shell structured UCNPs exhibited strong UC emission intensity and improved magnetic property . Furthermore, the core-shell-shell NPs were validated to be no cytotoxicity by cell viability assessment. Therefore, this research may open a general avenue for the synthesis of small size multifunctional UCNPs for practical bioapplications without overheating.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lei Chen,Yanwen Jing,Zhimin Xu,Mengyao Shao,Shengyan Ge,Xingfu Zhou
The introduction of up-conversion materials converting near infrared light into useable visible light has been proven to be a promising strategy for improving the performance of perovskite solar cells . In this work, the up-conversion material of NaYF 4 :Yb 3+ , Er 3+ nanoparticles (NPs) were successfully prepared by one-step hydrothermal route and incorporated into Al 2 O 3 as the scaffold layer for the air-processed carbon-based mesoscopic perovskite solar cells (MPSCs). FESEM shows that the size of NaYF 4 :Yb 3+ , Er 3+ nanoparticles is about 100 nm and there is no obvious agglomeration. The UV–vis–NIR absorption spectrum of the mixed scaffold layer demonstrates a distinct infrared light response. The infrared photoelectric efficiency and EQE tests were used to verify that NaYF 4 :Yb 3+ , Er 3+ nanoparticles improved the photo response of the device in the infrared region, thereby improved the photoelectric performance of the MPSCs. An optimal efficiency of 13.04% was obtained by incorporating 25 wt% NaYF 4 :Yb 3+ , Er 3+ nanoparticles into the Al 2 O 3 scaffold layer, which shows a 20.6% increase in conversion efficiency when compared with the device without using the up-conversion material (10.81%). The optimized carbon-based MPSCs also show an infrared responded PCE value of 0.11% under infrared irradiation from 800 to 1100 nm. This paper shows that the up-conversion material expands the light response of solar cells to the infrared region and provides an effective method for the preparation of high-efficiency perovskite solar cells.
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OPTICAL MATERIALS
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2023
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IF 3.9
Chunyang Kang,Xianwei Zuo,Lei Zhao,Cuiling Ren,Yan Wang,Yidan Liu,Xin He,Xin Li,Genliang Han
The red emission of upconversion nanoparticles (UCNPs) is located in an “optical window” range of the biological tissue, which has a promising prospect in biology application. In this work, novel red-emitting NaYF 4 :Yb 3+ /Er 3+ UCNPs with CH 3 COO − modifications were synthesized by single-mode focused microwave method. The morphology, structure, and luminescence properties of as-prepared UCNPs were characterized. The results showed that single-mode focused microwave method was an effective approach to prepare hydrophilic and strongly red emission UCNPs within a drastically reduced reaction time (only 10 min) compared to the traditional methods. Importantly, we also demonstrated that the CH 3 COO − modified NaYF 4 :Yb 3+ /Er 3+ UCNPs could be successfully applied for in vitro imaging of HeLa cells. This work not only provides a rapidly synthetic methodology for the preparation of red-emitting UCNPs but also offers an effective material for cancer cell imaging .
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LANGMUIR
·
2013
·
IF 4.187
Ziyong Cheng,Ruitao Chai,Pingan Ma,Yunlu Dai,Xiaojiao Kang,Hongzhou Lian,Zhiyao Hou,Chunxia Li,Jun Lin
Bilayer thermosensitive P(NIPAm-co-AAm) hydrogel discs were prepared by a facile UV light initiation process from N-isopropylacrylamide (NIPAm) and acrylamide (AAm) monomers’ cross-linking copolymerization. Poly(ethylene glycol) (PEG) as a pore-forming agent was added in order to form a porous structure and improve the water content in the hydrogel. Functional materials of NaYF4:Yb3+/Er3+ nanoparticles and multiwalled carbon nanotubes (MWCNTs) were incorporated into different layers of the P(NIPAm-co-AAm) hydrogel for the purpose of up-conversion luminescence labeling and the NIR light antenna effect, respectively. Significantly improved drug release from composite hydrogels was achieved in response to 980 nm NIR light irradiation by using lysozyme as a macromolecular drug. The multifunctional hydrogel reported here provides a platform for simultaneous NIR luminescence labeling and NIR-driven drug release.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yujie Luo,Shiyu Zhou,Yaofang Sun,Deqiang Zhao,Xiaosong Gu,Qiutong Yan,Fangying Ji,Xuan Xu
To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF 4 :Yb 3+ , Er 3+ @BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity . Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Ning Li,Hong Shao,Haina Qi,Yuqi Sheng,Liu Yang,Yunrui Xie,Dan Li,Wensheng Yu,Qianli Ma,Xiangting Dong
A simple and universal technique of the combination of uniaxial electrospinning with subsequent peculiar dual-crucible fluorination technology is innovatively designed and used to construct metallic fluorides yolk-shell nanofibers (YSNFs) and yolk-shell nanobelts (YSNBs) directly for the first time. As a case study, Yb 3+ /Er 3+ co-doped alkaline earth metal fluoride (BaF 2 , SrF 2 and CaF 2 ) as core layer and SiO 2 as shell layer are applied to construct the yolk-shell one-dimensional nanostructures . Under the optimum calcination temperature (600 °C) and time (5 h), the obtained MF 2 :Yb 3+ , Er 3+ /SiO 2 (M=Ba, Sr, Ca) samples are of pure cubic phase, and display the yolk-shell nanofibers and yolk-shell nanobelts with good size uniformity and green up-converting fluorescence. By HF acid treatment of the samples, it is not only proved that the shell layer is SiO 2 , but also independent core-layer MF 2 :Yb 3+ , Er 3+ (M=Ba, Sr, Ca) nanofibers and nanobelts with good size uniformity and excellent up-conversion luminescence are obtained. Especially, only fluorination process among the halogenation can form such exceptive YSNFs and YSNBs one-dimensional nanostructures , and the formation mechanisms of YSNFs and YSNBs are proposed and verified, and further the novel technique is established. The new technique possesses the merits of simple device and easy operation, large output, well-defined morphology and high preparative success rate of yolk-shell nanofiber and yolk-shell nanobelt, universality to metallic fluorides. The design philosophy and the construction technique for the exceptional yolk-shell one-dimensional nanostructures afford a facile approach for the fabrication of other functional metal fluorides yolk-shell one-dimensional nanostructures.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Dan Wu,Yanni Lang,Junhao Li,Qiu Fu,Yugeng Wen,Dacheng Zhou,Yong Yang,Yongjin Li,Zhiguo Song,Jin Han,Jianbei Qiu
Upconversion luminescent materials can convert near-infrared excitation into higher-energy emissions, showing great potential in applications such as temperature sensing and optical anti-counterfeiting. However, it remains challenging to simultaneously achieve high thermal stability, sensitive temperature response, and circularly polarized luminescence within a single system. In this work, chiral Bi 4 O 5 Br 2 : Yb 3+ /Er 3+ nanosheets were synthesized via a hydrothermal method combined with chiral modification and pH regulation, and their structural and luminescent properties were systematically investigated. The results indicate that pH regulation during precursor synthesis facilitates the optimization of the Bi 4 O 5 Br 2 morphology and improves its crystallinity, thereby promoting a more ordered crystal growth process. Subsequently, chiral induction introduces local lattice distortion while suppressing defect formation. The synergistic effect of both helps to significantly enhance upconversion luminescence performance. Under variable-temperature conditions, the 849 nm near-infrared emission ( 4 I 9/2 - 4 I 15/2 ) exhibits negligible thermal quenching over the temperature range of 293−533 K, in sharp contrast to the thermally quenched behavior of visible emissions. Based on this feature, a fluorescence intensity ratio (FIR) thermometry strategy was established, achieving high sensitivity with an absolute sensitivity ( S a ) of 20.73%/K and a relative sensitivity ( S r ) of 3.45%/K. Furthermore, the material exhibits pronounced emission intensity differences under circularly polarized excitation and detection. This enables the construction of a polarization-color synergistically tunable luminescent anti-counterfeiting system. This work provides a new strategy for designing multifunctional upconversion materials that integrate optical thermometry and polarization-based anti-counterfeiting capabilities.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yuanyuan Tian,Yue Tian,Ping Huang,Lei Wang,Qiufeng Shi,Cai’e Cui
Yb 3+ /Er 3+ co-doped YNbO 4 nanoparticles (NPs) with an average size of 35 nm were prepared via modified molten salt method for the first time. The phase purity, crystal structure, morphologies, and upconversion luminescence (UCL) properties as well as quantum yield and temperature sensing behavior of the as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and upconversion luminescence (UCL) spectra, respectively. The XRD Rietveld refinements based on the XRD data were employed to reveal the phase purity and structure of the as-prepared samples. It was confirmed that the optimal doping concentration of Yb 3+ ions in YNbO 4 :Yb 3+ , Er 3+ NPs is around 10 mol%, which has a maximal quantum yield of 0.1%. The temperature sensing behavior of the as-prepared YNbO 4 :Yb 3+ , Er 3+ NPs was studied based on the fluorescent intensity ratio (FIR) technique from two thermal coupled 2 H 11/2 and 4 S 3/2 levels. It was found that the temperature sensitivity was sensitive to the doping concentration of Yb 3+ ions. In addition, the dependence of UCL colors on temperature was observed and the corresponding mechanism was proposed. Therefore, the as-prepared Yb 3+ /Er 3+ co-doped YNbO 4 NPs have double function of optical thermometer and safety sign for the high temperature environment.
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高影响因子
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