RSC Advances
·
2015
·Vol. 5
·期 101
·83149-83154
·
IF 3.84
Di Kang,Xiaoyan Song,Jinfeng Xing
Ytterbium and erbium co-doped sodium yttrium fluoride (NaYF4:Er3+, Yb3+) rare-earth upconversion nanoparticles (UCNPs) with different phases were prepared and characterized. The luminescence intensity of UCNPs can be enhanced by coating a uniform layer of the shell. The crystal structure, morphology and upconversion spectra of the sample were investigated using X-ray powder diffractometry, transmission electron microscopy, and laser upconversion spectrometry with a 980 nm diode laser. Finally, UCNPs with core–shell structure were modified to be hydrophilic by ligand-free hydrophilic modification. Moreover, the water dispersible UCNPs have much stronger luminescence compared with hydrophobic UCNPs.
研究领域:
材料科学
·
光学
·
纳米技术
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高影响因子
Advanced Physics Research
·
2025
·
IF 2.8
Juan Ouyang,Ze Zhang,Minghua Shangguan,Haozhang Huang,Yuxuan Qiu,Songbin Liu,Junjun Tan,Xinyu Ye,Bo Zhou
Lanthanide-doped upconversion nanoparticles (UCNPs) have attracted extensive interest in broad frontier fields such as nanophotonics and biomedicine. However, low luminescence intensity, severe nonradiative energy loss, and limited color-tuning capability still urgently need to be addressed. Herein, a functional interface engineering regulation strategy is proposed to achieve a significant enhancement in upconversion luminescence intensity and multicolor output from the NaErF 4 @NaYF 4 core–shell nanocrystals. It is found that adjusting the amount of CF 3 COONa in the precursor during the shell growth is able to modulate lattice defect densities at the interface and thereby tune the energy migration paths and non-radiative transition processes of Er 3+ in the core. This also results in a multicolor tuning from green to yellow, orange, and red under 980 nm excitation, and the overall upconversion luminescence intensity is significantly enhanced by 17.1 times. Moreover, the interface engineering strategy is also applicable to 808 and 1540 nm excitations and the UCNPs with other shells (e.g., NaLuF 4 and NaGdF 4 ). These results provide new insights into the photochromic tuning of highly doped UCNPs and exhibit great promise in multiple anti-counterfeiting, information security, and biosensing and bioimaging.
研究领域:
纳米光子学
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材料科学
·
生物医学工程
·
光学材料
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防伪技术
·
生物成像
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xiadiyan Refuhati,Xiaojun Guo,Yanzhen Xiao,Jinze Li,Sihan Wang,Wangze Li,Yifan Zhu,Lei Yan,Zhengkun Fu,Zhenglong Zhang,Hairong Zheng
Integrating upconversion nanoparticles (UCNPs) with nanodiamonds (NDs) constitutes a promising platform for the development of multifunctional systems in photonics and sensing. However, achieving strong interfacial coupling while preserving the unique properties of both components remains a significant challenge. In this study, we introduce a novel composite material formed by covalently conjugating NaYF 4 : Yb 3 + /Er 3 + UCNPs with NDs. Subsequent controlled near-infrared (NIR) laser processing generates a high-phonon-energy, sp 2 -hybridized carbon interface on the NDs while preserving the intrinsic nitrogen vacancy (NV) centers. This leads to the selective quenching of the Er 3 + red emission ( 4 F 9 / 2 → 4 I 15 / 2 ), resulting in green-dominant luminescence and a shortened fluorescence lifetime. The laser-processed composite demonstrates enhanced temperature-sensing performance by utilizing non-thermally coupled levels (NTCLs) of Er 3 + , specifically the 2 H 11 / 2 and 4 F 9 / 2 levels. The composite achieves a maximum relative sensitivity of 4.89% K −1 over a temperature range of 173–523 K. This work establishes laser processing as a powerful strategy for tailoring interfacial properties in hybrid nanomaterials, thereby opening new possibilities for high-performance temperature sensors and multifunctional platforms in quantum sensing and bioimaging.
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MATERIALS CHEMISTRY AND PHYSICS
·
2015
·
IF 2.259
Xiaowen Zhang,Zhi Chen,Jianrong Qiu
Near infrared to visible up-conversion luminescence in Er 3+ single doped BaCl 2 , BaF 2 and NaYF 4 phosphors were compared. Intense blue emission at 410 nm due to 2 H 9/2 → 4 I 15/2 transition and greenish-blue emission at 496 nm due to 4 F 7/2 → 4 I 15/2 transition were only observed in BaCl 2 :Er 3+ when excited by 808 nm and 976 nm laser diodes , respectively. The phenomena can be ascribed to the direct two-step excitation processes which occur in the chlorides where multiphonon relaxation is rapidly suppressed. In addition, the intensity of upconversion emission in BaCl 2 :Er 3+ is greatly enhanced upon broadband near-infrared excitation.
研究领域:
材料科学
·
光学材料
·
无机化学
·
发光物理
·
纳米生物技术
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DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Chunyu Qi,Li Chen,Yuan Gao,Yue Wang,Jing Li,Ligong Zhang,Yongshi Luo,Xiaojun Wang
Size and size distribution control along with the excitation/emission wavelength manipulation are the most indispensable for both fundamental research and applications of upconverting nanophosphors. In contradiction to the usual Ostwald ripening process, digestive ripening-mediated growth of core–shell nanostructures is observed in a lanthanide-doped ternary fluoride system. Time-dependent size evolution of NaYbF4:Tm@NaYF4 nanoparticles is systematically investigated, and a Ksp-involved growth mechanism is proposed to better understand this unusual phenomenon. The upconversion luminescence (UCL) intensity and branch ratio of near-infrared to visible emission (NIR/VIS) dramatically increase due to the NaYF4 coating but subsequently undergo a decline when an additional SiO2 layer grows outside. As a comparison, an alternant type of core–shell–shell nanostructure, NaYbF4:Tm@SiO2@NaYF4, is further constructed, in which both the UCL intensity and NIR/VIS ratio exhibit an inverse trend. The comparative analysis on the basis of steady and transient spectroscopic data from NaYbF4:Tm, and alternatively coated by silica and NaYF4 nanoshells, respectively, demonstrates that the UCL properties can be regulated through core–shell engineering once the optical behavior of the surface states can be manipulated. The results provide a promising alternative strategy to fabricate a uniform core–shell nanostructure with multicompositions, and this NIRin–NIRout luminescent profile deserves an expectable vision for the subsequent clinical applications of UCL imaging for deep biological tissues.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yue Hu,Yanmin Yang,Xuefeng Zhang,Xin Wang,Xiaoxiao Li,Yunqian Li,Tianyi Li,Hongwu Zhang
Here, an X-ray-excited super-long afterglow phosphor β-NaYF4:Tb3+ has been discovered for the first time. After X-ray irradiation, the green emission can persist for more than 240 h. After 120 h, the power density of afterglow reached 3.76 × 10–6 W·m–2, which can be clearly observed by the naked eye under dark vision. Also, combined with the results of thermoluminescence and photoluminescence, the super-long afterglow emission of β-NaYF4:Tb3+ can be ascribed to the tunneling model associated with F centers. More importantly, the super-long green afterglow emission of β-NaYF4:Tb3+ has been successfully used as an in vivo light source to activate g-C3N4 for photodynamic therapy and bacteria destruction. Furthermore, super-long persistent luminescence of β-NaYF4:Tb3+ could be repeatedly charged by X-rays for many cycles, which indicates that the phosphors have high photostability under repeated cycles of alternating X-ray irradiation.
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Materials Express
·
2023
·Vol. 13
·期 11
·1915-1921
·
IF 0.7
Chen Sihan,Hu Huiqi,Jiang Wenting,Zhang Yuyun,Luo Xiaohu,Peng Jiayi,Li Le,Zhen Deshuai,Wang Hanqing
A novel near-infrared induced upconversion sensor for the detection of uranyl ions was successfully constructed using β-NaYF4: Yb, Tm, Gd upconversion nanoparticles (UCNPs) and specific DNAzyme. Characterization of the UCNPs@DNAzyme was conducted using XRD, TEM, FT-IR and
fluorescence testing, and it was shown that the β-NaYF4: Yb, Tm, Gd nanoparticles were successfully prepared (∼27 nm). Upon 980 nm excitation, the UCNPs@DNAzyme emitted green light at λ=475 nm. Furthermore, Förster resonance energy transfer was observed between
the UCNPs@DNAzyme (doner) and uranyl (acceptor) present on the substrate chain. This resulted in fluorescence quenching, which was used to quantify the concentration of uranyl. The developed method was found to be highly selective and sensitive, with a detection limit as low as 43 nM. This
method also demonstrated excellent specificity and sensitivity for the determination of uranyl in water samples, indicating its potential application in near-infrared fluorescence detection and imaging of uranyl in vivo.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 4
·2100162
·
IF 1.599
Yanli Ding,Zhaohan Li
The low luminous efficiency of upconversion materials limits their practical applications in various fields. The present study focuses on the efficient upconversion enhancement of β-NaYF 4 :Yb,Er induced by Bi 3+ doping. The XRD and SEM results show that introducing Bi 3+ into the matrix lattice changes the microstructure and particle size of the crystal. The photoluminescence spectra show that at 6% Bi 3+ doping, the red and green emission intensities are enhanced by 12 and 8 times, respectively. The reason could be the lattice distortion caused by Bi 3+ doping, breaking the partial forbidden transition of rare-earth ions. The fluorescence lifetime measurement reveals that the Bi 3+ doping changes the environment around erbium ions, affecting the energy level lifetime of erbium ions, explaining the luminescence dynamics law. The present study provides a facile route to achieve nano/microstructures with intense upconversion luminescence with potential applications in optoelectronic devices.
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Aggregate
·
2023
·Vol. 4
·期 6
·e387
·
IF 18.8
Dengfeng Yang,Wei Zheng,Ping Huang,Meiran Zhang,Wei Zhang,Zhiqing Shao,Wen Zhang,Xiaodong Yi,Xueyuan Chen
Lanthanide (Ln 3+ ) oxysulfide nanocrystals (NCs) have great prospect in many advanced technologies; however, they suffer from a low photoluminescence efficiency due to the volatility of sulfur and deleterious surface quenching effect. Herein, we report a novel sandwiched luminescent heterostructure based on Ln 3+ -doped Gd 2 O 2 S@NaYF 4 core/shell NCs with tunable sulfur content in the sandwich layer. By means of Eu 3+ as the sensitive structural probes, we unravel the ligand-mediated structure control of the NCs from Gd 2 O 3 : Ln 3+ @NaYF 4 to Gd 2 O 2 S: Ln 3+ @NaYF 4 with tailored S 2– deficiency. Such a sandwich-type core/shell heterostructure enables us to achieve efficient and multicolor downshifting and upconversion luminescence (UCL), with up to 208.8 folds of enhancement in UCL intensity as compared to that of their core-only counterparts. These findings provide a general approach for the controlled synthesis of lanthanide oxysulfide@fluoride heterostructure, which offers a new way for the materials design towards diverse emerging applications.
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RSC Advances
·
2016
·Vol. 6
·期 86
·83321-83327
·
IF 3.289
Zhangyu Huang,Huiping Gao,Yanli Mao
In this study, the energy transfer (ET) mechanism among Yb3+/Er3+/Mn2+ has been revealed by download conversion (DC) and upconversion (UC) transients and steady-state fluorescence spectra. Moreover, the novel structure, inert-core/active-shell/inert-shell cubic NaYF4@NaYF4:Er3+/Yb3+/Mn2+@NaYF4, has been synthesized via a convenient hydrothermal method. With the excitation of a 980 nm laser diode, bright single-red upconversion (UC) fluorescence is observed, which shows the longest UC lifetime and highest efficiency compared with the other structures of NaYF4:Er3+/Yb3+/Mn2+, NaYF4:Er3+/Yb3+/Mn2+@NaYF4, and NaYF4@NaYF4:Er3+/Yb3+/Mn2+. The inert-core/active-shell/inert-shell nanocubes are homogeneous with an ultra-small (sub-20 nm) size, which is suitable for distribution and elimination in biological tissue. Our results indicate that the Mn2+ doping of δ-doped structures is an effective method to significantly improve UC single-red light, which shows great potential application in vivo bioimaging.
研究领域:
材料科学
·
生物成像
·
光学
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高影响因子
Laser & Photonics Reviews
·
2014
·Vol. 8
·期 4
·575-582
·
IF 9.313
Wu Suli,Liu Ye,Chang Jie,Ning Yanhui,Zhang Shufen
Upconversion emission intensity and morphology are both important features of NaYF 4 :Yb 3+ , Er 3+ microcrystals. In this paper, myristic acid (MA) is selected as a novel stabilizing ligand to synthesize NaYF 4 :Yb 3+ , Er 3+ through a facile hydrothermal method. Upconversion fluorescence spectra indicate that the emission intensity of product prepared with MA as ligand has increased dramatically compared with the sample prepared using commonly used oleic acid (OA) as ligand. Field emission scanning electron microscopy (FE-SEM) results display that the morphology of NaYF 4 :Yb 3+ , Er 3+ obtained using MA as ligand can be tuned from nanodisk, nanorod to nanotube. Especially, nanotube with clear caves can be prepared directly with proper concentration of base (NaOH). And powder X-ray diffraction (XRD) analysis reveals a relationship between the phase transformation process and the amount of NaOH. With increasing the amount of NaOH, the transition process of cubic phase to hexagonal phase is accelerated. The effect of F − and OH − on the fluorescence properties of NaYF 4 :Yb 3+ , Er 3+ are studied systematically. A gradual increase of the amount of NaF results in a regular increase of the emission intensity. On the contrary, the emission intensity decreases with increasing the amount of NaOH. In addition, reasonable explanations of the influence of F − and OH − on emission intensity are given as well.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Science China-Chemistry
·
2016
·Vol. 60
·期 1
·122-129
·
IF 2.429
Zhang Shaohan,Chen Shizhu,Gao Chunyue,Jin Yi,Jia Guang,Li Zhenhua,Liu Dandan,Liang Xingjie,Yang Xinjian,Zhang Jinchao
As lanthanide-doped sodium yttrium flouride (NaYF 4 ) nanoparticles have great potential in biomedical applications, their biosafety is important and has attracted significant attention. In the present work, three different sized NaYF 4 :Eu 3+ nanoparticles have been prepared. Liver BRL 3A cell was used as a cell model to evaluate their biological effects. Cell viability and apoptosis assays were used to confirm the cytotoxicity induced by NaYF 4 :Eu 3+ NPs. Apart from the elevated malondialdehyde (MDA), the decrease of superoxide dismutase (SOD), glutathione peroxidase (GSH-PX) and catalase (CAT) activity indicated reactive oxygen species (ROS) generation, which were associated with oxidative damage. The decrease of mitochondrial membrane potential (MMP) value demonstrated the occurrence of mitochondria damage. Then, release of cytochrome c from mitochondria and activation of caspase-3 confirmed that NaYF 4 :Eu 3+ NPs induced apoptosis was mitochondria damage-dependent.
研究领域:
纳米医学
·
毒理学
·
细胞生物学
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DOI
高影响因子
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