DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 23
·7862-7871
·
IF 4.174
Yini Mao,Pengfei Xian,Li Jiang,Shanshan Hu,Jianfeng Tang,Jun Yang
NaScF4:Yb3+/Er3+ crystals were successfully hydrothermally synthesized using distilled water as a single solvent. The crystal phase and morphology were characterized by XRD and SEM. Compared with organic solvents such as ethanol, ethylene glycol and ether, the molar ratio of Na/F/Sc plays an important role in the synthesis of NaScF4 crystals. Morphological control was achieved by changing the types of additives, and the relationship between morphology and luminescence properties was explored. The NaScF4:Yb3+/Er3+ phosphors exhibit strong green and red UC emissions under the excitation of 980 nm NIR. Optimal concentrations of Yb3+ and Er3+ for up-conversion luminescence performance were identified as 10% and 2%, respectively. Without any subsequent heat treatment process, the obtained NaScF4:10%Yb3+/2%Er3+ showed good temperature sensitivity. The temperature sensing ability was investigated by employing the dependence of the fluorescence intensity ratio (FIR) of the two thermal coupling energy levels of Er3+ (2H11/2 → 4I15/2 and 4S3/2 → 4I15/2) on temperature; the maximum sensitivity SA/SR was 0.00256 K−1/0.00317 K−1 at 548 K, and it increased to 0.00328 K−1/0.00413 K−1 after adding EDTA. In addition, an evaluation of temperature uncertainty during temperature measurement was performed, and was found to be 0.073 K and 0.095 K in the presence and absence of EDTA, respectively. Compared with some other reported materials, the obtained material shows a relatively superior temperature sensitivity, which provides new ideas for the improvement of temperature-sensitive materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 23
·15412-15418
·
IF 4.493
Jun Liu,Huawei Deng,Zhanyun Huang,Yueli Zhang,Dihu Chen,Yuanzhi Shao
Manipulation of upconversion (UC) emission is of particular importance for multiplexed bioimaging. Here, we precisely manipulate the UC color output by utilizing the phonon-assisted energy back transfer (EBT) process in ultra-small (sub-10 nm) Gd2O3:Yb3+/Er3+ UC nanoparticles (UCNPs). We synthesized the Gd2O3:Yb3+/Er3+ UCNPs by adopting the laser ablation in liquid (LAL) technique. The synthesized Gd2O3:Yb3+/Er3+ UCNPs are small spherical and monoclinic structures. Continuous color-tunable (from green to red) UC fluorescence emission is achieved by increasing the concentration of Yb3+ ions from 0 to 15 mol%. A phonon-assisted energy back transfer (EBT) process from Er3+ (4S3/2 → 4I13/2) to nearby Yb3+ (2F7/2 → 2F5/2), which can significantly enhance red emission at 672 nm and decrease green emission, is responsible for the color-tunable UC emission by increasing the Yb3+ concentration in Gd2O3:Yb3+/Er3+ UC nanoparticles.
研究领域:
纳米医学
·
生物成像
·
光功能材料
·
分子影像学
·
转化医学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Qifeng Chen,Yu Yao,Shuo Zheng,Qianhong Shen,Libei Jiang,Qinhua Fang,Hui Yang
A novel Yb 3+ /Er 3+ co-doped BiOBr photocatalyst with 3D flowerlike hierarchical architectures were successfully fabricated through self-assembled process without any templates under hydrothermal conditions, and the structure and properties of the photocatalysts were characterized. The results indicate that Yb 3+ ions and Er 3+ ions are successfully doped into the lattice of BiOBr, and the as-obtained photocatalyst can respond the NIR light and emit red and green light due to the up-conversion effect of the rare-earth ions. Meanwhile, with co-doped Yb 3+ /Er 3+ ions content increasing, oxygen vacancy concentration in the photocatalyst rises. The oxygen vacancy will form the intermediate energy band, which can decrease the photon energy required for electronical transition, and thus help to utilize the luminous energy generated by up-conversion luminescence. Moreover, the appropriate introduction of defects (oxygen vacancy defect and impurity atom) can further promote the transfer and separation efficiency of photo-generated carriers. Hence, Yb 3+ /Er 3+ co-doped BiOBr photocatalyst exhibits enhanced photocatalytic properties under broad spectrum (UV/vis/NIR) excitation, which is about 4 times as high as that of pure BiOBr.
研究领域:
材料科学
·
光催化
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Xiangyan Yun,Jun Zhou,Yaohui Zhu,Xiong Li,Shan Liu,Chen Fang,Mingxia Lv,Denghui Xu
Up-conversion fluorescent materials serve a significant function as the detection materials of temperature sensors . In this study, a series of green-emitting LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors applied in optical temperature sensing detection were successfully synthesized via the solid-state process in air. The crystal structure, luminescence properties, luminescence mechanism, and optical temperature sensing properties of samples were investigated. LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphor with excitation at 980 nm emits pronounced green emissions owing to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. The whole emission processes of LiLu 0.72 W 2 O 8 :0.24 Yb 3+ , 0.04Er 3+ sample are all two-photon processes. Moreover, we apply thermal coupling levels ( 2 H 11/2 , 4 S 3/2 ) for temperature sensing and the value of sensing sensitivity can reach the maximum of about 1.41% K −1 . All the experimental results imply that LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors show good potential in temperature sensing.
研究领域:
材料科学
·
光学
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jianyuan Li,Yingjun Li,Lu Zi,Shasha Wang,Gejihu De
Bismuth-based composite fluoride upconversion luminescent materials exhibit uniform size and excellent upconversion properties. These materials have potential applications in photodynamic therapy, anti-counterfeiting technology, and bio-imaging. Thus, bismuth-based composite fluoride luminescent materials have been the subject of extensive study in recent years. This paper focuses on the design and synthesis of bismuth-based composite fluorides, specifically Yb 3+ /Er 3+ co-doped Ba 0.6 Bi 0.4 F 2.4 and its heterostructured Ca 0.6 Bi 0.4 F 2.4 upconversion luminescent materials. The study involves measuring room temperature fluorescence spectra, fluorescence lifetime, and quantum yield, demonstrating the exceptional luminescence performance of Ca 0.6 Bi 0.4 F 2.4 :Yb 3+ /Er 3+ . More importantly, we successfully obtained transparent lanthanide-doped Ca 0.6 Bi 0.4 F 2.4 thermoplastic polyurethane (TPU) luminescent films and upconversion luminescent inks. This work highlights the great potential of upconversion nanomaterials in anti-counterfeiting fields.
研究领域:
材料科学
·
光学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Dongxun Chen,Fang Wang,Jianqiang Bi,Weili Wang,Lu Wang,Kangning Sun,Dongqi Tang,Yanjie Liang
Bi 2 O 3 nanospheres co-doped with Yb 3+ /Er 3+ upconverting ions pair have been successfully synthesized via a facile hydrothermal method followed by a heat treatment. The resulting Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres show a monodisperse spherical morphology with narrow size distribution (~180 nm) and display intense upconversion luminescence under 980 nm laser excitation. It is found that the crystal structure, morphology and upconversion luminescence properties of nanospheres have a direct relationship with the doping concentration of Yb 3+ and the subsequent calcination temperature. These Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres can be prepared in large quantities and can be easily modified with a layer of biocompatible polyethyleneimine (PEI) molecules. The yielded nanospheres could not only maintain uniform size and morphological characteristics, but also show good water dispersibility and biocompatibility. Remarkably, these Bi 2 O 3 :Yb 3+ ,Er 3+ upconversion nanophosphors could also act as an effective contrast agent for X-ray computed tomography (CT) imaging, which show higher contrast efficacy than commercial iodine-based contrast agent. The proposed facile synthetic route and inexpensive matrix materials pave the way for broad use of these Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres as ideal dual-mode bioimaging probes in biomedical field.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光学成像
✓ 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）