ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Kun Ge,Cuimiao Zhang,Wentong Sun,Huifang Liu,Yi Jin,Zhenhua Li,Xing-Jie Liang,Guang Jia,Jinchao Zhang
The rare earth hollow spheres with up-conversion luminescence properties have shown potential applications in drug delivery and bioimaging fields. However, there have been few reports for the degradation properties of rare earth oxide drug carriers. Herein, uniform and well-dispersed Y2O3:Yb3+,Er3+ hollow spheres (YOHSs) have been fabricated by a general Pechini sol–gel process with melamine formaldehyde colloidal spheres as template. The novel YOHSs with up-conversion luminescence has good drug loading amount and drug-release efficiency; moreover, it exhibits pH-responsive release patterns. In particular, the YOHSs sample exhibits low cytotoxicity and excellent degradable properties in acid buffer. After the sample was loaded with anticancer drug doxorubicin (DOX), the antitumor result in vitro indicates that YOHS-DOX might be effective in cancer treatment. The animal imaging test also reveals that the YOHSs drug carrier can be used as an outstanding luminescent probe for bioimaging in vivo application prospects. The results suggest that the degradable drug carrier with up-conversion luminescence may enhance the delivery efficiency of drugs and improve the cancer therapy in clinical applications.
研究领域:
生物医学工程
·
纳米医学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Yan Shaohan,Wang Lijing,Shan Pengnian,Lin Xue,Shi Weilong
Against the backdrop of increasing energy shortages, hydrogen energy has garnered significant attention as a green and clean alternative energy source. To fully exploit a broader portion of the solar spectrum, we designed a Y 2 O 3 :Yb 3+ , Er 3+ /ZnIn 2 S 4 (denoted as YYE/ZIS) composite photocatalyst with a well-defined loaded structure of coating Y 2 O 3 :Yb 3+ , Er 3+ nanoparticles on the ZnIn2S4 micro-flowers, capable of efficiently utilizing near-infrared (NIR) light through an up-conversion mechanism. The introduction of Yb 3+ and Er 3+ ions endows the Y 2 O 3 with excellent up-conversion luminescence properties, enabling the effective conversion of lowenergy NIR photons into high-energy visible light over YYE/ZIS composite, which subsequently activates the ZIS component for NIR-driven photocatalytic hydrogen production. Photoelectrochemical characterizations reveal that the loaded structure significantly facilitates efficient charge separation and migration at the interface, while markedly suppressing the recombination of photogenerated electron-hole pairs, thereby enhancing the overall photocatalytic performance. Remarkably, the catalyst demonstrates excellent NIR-response hydrogen evolution performance (16.3 μmol·g -1 ·h -1 ) even in the absence of noble metal co-catalysts, such as Pt, achieving a hydrogen production rate approximately 10.9 times higher than that of pristine ZIS. This work proposes a novel approach for constructing up-conversion-enabled composite photocatalysts with rationally engineered interfacial architectures.
研究领域:
材料科学
·
能源化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Yong Tang,Qiuyue Ran
This paper synthesized Y 2 O 3 : Yb 3+ /Er 3+ /Tm 3+ fluorescent crystals (YET) by annealing using the laser zone melting method. When the 365 nm(UV) and 980 nm(IR) lasers are excited together, the luminescence color of YET can be changed by adjusting the laser power. It can be adjusted between orange-red, yellow-green, and white. The temperature sensing characteristics based on the fluorescence intensity ratio (FIR) of non-thermally coupled levels (NTCL) and thermally coupled levels (TCL) of Tm 3+ and Er 3+ ions were studied. The derived maximum relative sensitivity ( S R ) reached the impressive value of 10.871 K -1 (303 K) and 0.511 %K −1 (563K), respectively. Moreover, as the temperature increases, the luminescence of the YET emission changes from white to blue. So, the luminescence emitted by YET can be adjusted between red, green, blue, and white. Therefore, using dual lasers to excite fluorescent materials can provide a suitable method for color-adjustable phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Chemical Physics Impact
·
2025
·
IF 4.3
Zixuan Jiang,Bing Liu,Zehua Zhang,Lili Wang,Zhixu Jia,Dan Zhao
The co-doping effect of Zr 4+ ions on upconversion (UC) luminescent properties in visible region of Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals prepared by urea precipitation method has been investigated under 980 nm excitation. Compared with the original Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals, the UC luminescence of sub-microcrystals with similar size was enhanced after Zr 4+ ions co-doping. The UC luminescent properties have been discussed in detail via luminescence spectra, decay curve analysis and a suitable energy level diagram. The enhancement mechanism of UC luminescence in the two series of Zr 4+ ions doped sub-microcrystals was attributed to the complex crystal field around Er 3+ ions caused by Zr 4+ ions co-doping. After Zr 4+ ions substituted Y 3+ ions and entered the crystal lattice, the charge mismatch and lattice distortion made the crystal field more complex. This research contributes to the understanding of UC luminescent properties of lanthanide (Ln 3+ ) ions doped UC materials and their technological applications in fields such as bioimaging, drug delivery, and optical temperature sensors.
研究领域:
材料科学
·
光学
·
生物成像
·
药物递送
·
光学温度传感器
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7378-7385
·
IF 6.641
Leipeng Li,Feng Qin,Lu Li,Hong Gao,Zhiguo Zhang
Highly sensitive optical thermal sensing is achieved here based on the three-photon upconversion luminescence of Y2O3:Yb3+,Er3+ nano-thermometers. In the temperature range of 303–783 K, the 4G11/2 and 2H9/2 energy levels of Er3+ ion embedded in Y2O3 nanocrystals are found to be thermally linked. The 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions’ intensity ratio thus satisfies the Boltzmann distribution. It is demonstrated that the relative sensitivity, on the basis of this ratio for temperature measurement, is as high as 2.05% K−1 at 303 K. It is, to the best of our knowledge, the maximum thermal sensitivity reported so far for the 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions in various hosts. Moreover, this sensitivity is larger than all previously reported values that depend on the luminescence of the Er3+ ion. What's more, this value is also among the highest sensitivities achieved based on other thermally linked states of rare earth ions. As an added benefit, it has been shown that the single 2H9/2–4I15/2 transition can also be used for optical thermal sensing and its relative sensitivity is up to 1.27% K−1 at 783 K, which is 2.9 times the theoretical maximum sensitivity of ratiometric thermal detection based on the thermally linked states of rare earth ions.
研究领域:
材料科学
·
光学传感
·
纳米技术
·
光子学
·
稀土离子
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shuai Hu,Maohui Yuan,Hanchang Huang,Changqing Song,Kai Han,Wenda Cui,Zining Yang,Hongyan Wang
Flame aerosol synthesis (FAS) is an excellent strategy for continuous, fast, and mass production of small-size upconversion nanoparticles (UCNPs), which have high potential applications in fields like biological imaging, colour display and optical temperature sensing. However, flame-made UCNPs have received less attention, and relevant studies are limited. Herein, for the first time, we successfully fabricated cerium (Ce)-doped homogeneous ultrasmall Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs using a liquid-fed FAS method. Ce was doped to improve the upconversion luminescence (UCL) of the Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. The overall UCL intensity was enhanced ∼77.9-fold for an optimal concentration of 20 mol% Ce-doped UCNPs, compared with the UCNPs without Ce doping with a relatively homogeneous ultrasmall size of 8–10 nm. Further studies confirmed that both trivalent (Ce 3+ ) and tetravalent (Ce 4+ ) simultaneously exist in the Y 2 O 3 hosts and are critical in enhancing the UCL properties. In addition, the fluorescence intensity ratio (FIR) method was used to evaluate the thermal properties of the fabricated UCNPs. Ce doping significantly improved the thermal sensitivity of Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. An excellent relative sensitivity ( S R ) of 0.622% K −1 at 598 K was obtained for flame-made UCNPs doped with 20 mol% Ce.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 39
·6925-6932
·
IF 3.756
Shuai Hu,Maohui Yuan,Changqing Song,Kai Han,Linxuan Wang,Hanchang Huang,Wenda Cui,Zining Yang,Hongyan Wang
Flame spray pyrolysis (FSP) is a potential strategy to scale-up the fabrication of upconversion nanoparticles (UCNPs) from the laboratory to industrial-scale production. The traditional FSP method involves the addition of 2-ethylhexanoic acid (2-EHA) to the precursors to obtain pure homogeneous ultrafine nanoparticles. However, there is still a lack of investigation into how the physical and optical properties are affected by 2-EHA. Here, for the first time, we report the role of 2-EHA in manipulating the morphology, size, and upconversion (UC) properties of Yb3+/Ho3+ co-doped Y2O3 UCNPs. The Y2O3:Yb3+/Ho3+ UCNPs were synthesized by adjusting the molar ratios of 2-EHA to trivalent rare earth ions (RE3+) in the precursor solution via the FSP method. The influence on the morphology and upconversion luminescence (UCL) properties of the UCNPs by 2-EHA was studied in detail. As the ratio of 2-EHA to RE3+ (2-EHA/RE3+) in the precursors increases from 0 to 3, the synthesized UCNPs initially form a mixture of large hollow particles and homogeneous ultrafine nanoparticles at low ratios and then uniform ultrafine nanoparticles at relatively high ratios. The typical green (550 nm) and red (667 nm) UCL reduce as the 2-EHA/RE3+ ratio increases. Moreover, the effect of 2-EHA on the temperature sensing behavior of the Y2O3:Yb3+/Ho3+ UCNPs was evaluated via the fluorescence intensity ratio (FIR) method based on the non-thermally coupled 5F4/5S2 and 5F5 levels of Ho3+ ions. The highest absolute sensitivity (SA) and relative sensitivity (SR) of 6.259% and 0.483% K−1 at 323 K, respectively, were determined and the sensitivity dependence on the 2-EHA/RE3+ ratio of the UCNPs was comparatively estimated.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 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）