OPTICAL AND QUANTUM ELECTRONICS
·
2023
·Vol. 55
·期 11
·1-15
·
IF 3
Li Xin,He Yu,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing
The Er 3+ , Yb 3+ and Mn 2+ co-doped perovskite NaMgF 3 submicron particles have been successfully fabricated and the related upconversion (UC) emission was investigated in this paper. The UC emission spectra confirm that the emission color of the Er 3+ ions can be modulated by the doping of the Mn 2+ ions, the incident laser power and the laser pulse-width. The UC emission results demonstrate that the key factor to modulate the UC emission color of the Er 3+ ions is the Mn 2+ ions in the submicron particles, in which the NaMgF 3 submicron particles have the largest relative green emission bands with the 3% Mn 2+ concentration. The experimental results also confirm that the UC intensities ratio of the green to the red emission will increase with the increase of the incident laser power and the decrease of the laser pulse-width. All the UC emission results imply that there are two energy transfer paths from the Mn 2+ state 4 T 1 to the Er 3+ ions, in which the transfer rate to the state 4 S 3/2 is far larger than the transfer rate to the state 2 H 11/2 and the energy transfer mechanism may related with the special structure of the Mn 2+ ions and the phonon-assisted processes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 14
·1989-1998
·
IF 2.7
Li Xin,He Yu,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing,Fang Weifeng
With the excitation of a 978 nm laser, upconversion emission of the NaMgF 3 : Tm 3+ , Yb 3+ , Mn 2+ submicron particles include two red emission bands located at 648 and 698 nm and a green emission at about 510 nm in the visible range. The experimental results confirm that the Mn 2+ ions play the key role in the emission modulation between the 648 nm and 698 nm. The incident laser power dependence confirms that the emission at 648 nm is completely different from the emissions at 698 nm, and more than 3 photons are involved in the emission at 648 nm. With the doping of Mn 2+ ions, the intensity ratio R 1 / R 2 of the emission at 648 nm and 698 nm increases first, and decreases for the Mn 2+ concentration larger than 2%. The incident laser power and laser pulse-width also have evident modulation effect of the UC emissions. All the Mn 2+ related phenomena are due to the energy transfer paths ET5 and ET6 between the Tm 3+ and Mn 2+ ions. Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 17
·2100624
·
IF 9.926
Yikuang Wang,Dunrong Chen,Yixi Zhuang,Wenjing Chen,Hangyu Long,Hongmin Chen,Rong-Jun Xie
Persistent luminescence (PersL) materials containing deep traps have attracted great attention in the field of optical information storage. However, the lack of nanomaterials with satisfactory light storage ability has become one of the main obstacles to the practical applications. In this work, NaMgF 3 :Tb 3+ @NaMgF 3 :Tb 3+ nanoparticles are reported which exhibit excellent light storage ability into deep traps upon X-ray irradiation and controllable photon emissions under thermal stimulation. A surface passivation strategy by constructing a core–shell structure is adopted, which is proved valid to greatly enhance the PersL efficiency. To understand the possible mechanism on the light storage and thermally stimulated PersL in the NaMgF 3 :Tb 3+ @NaMgF 3 nanoparticles, an energy level diagram is built and the electronic transition processes are clarified. According to the proposed mechanism, the Tb 3+ ions possibly serve as both emitting centers and trap centers in the NaMgF 3 host during the X-ray irradiation. Due to the excellent dispersibility and stability in water, luminescent inks containing the nanoparticles are successfully prepared and the applications to inkjet printing optical information storage and information decryption are demonstrated. The developed NaMgF 3 :Tb 3+ @NaMgF 3 PersL nanoparticles may inspire further research on lanthanide-activated fluoride PersL nanoparticles and provide new opportunities to the next-generation information storage and biomedical technologies.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 9
·2342-2350
·
IF 5.976
S. Ding,X. F. Yang,E. H. Song,C. L. Liang,B. Zhou,M. M. Wu,W. Z. Zhou,Q. Y. Zhang
Uniform perovskite core–shell nanocubes NaMn1−xMgxF3@NaMgF3 and NaMn1−xMgxF3:Yb3+@NaMgF3:Yb3+ have been successfully synthesized via a facile one-pot co-precipitation method at room temperature. The core–shell structures were carefully characterized by powder X-ray diffraction, transmission electron microscopy, scanning transmission electron microscopy and energy-dispersive X-ray elemental mapping. It was found that the formation mechanisms of the novel core–shell structures consist of aggregation of precursor molecules/ions, multiple nucleation, surface re-crystallization and further phase transformation. In addition, the DFT calculations further showed that Mn2+ ions tend to aggregate in NaMgF3:Mn2+, which may be one of the important intrinsic factors for the formation of the unique NaMn1−xMgxF3@NaMgF3 structure in this case. Besides, the unique core–shell structures NaMn1−xMgxF3:Yb3+@NaMgF3:Yb3+ can obviously enhance the near-infrared upconversion luminescence of Mn2+, which may find high potential in multiple high-resolution imaging applications.
研究领域:
材料科学
·
纳米技术
·
发光材料
·
无机化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Li,Xiaoyi Wu,Yeqing Chen,Qingguang Zeng,Tingting Deng,Ting Yu
In recent years, the pursuit of luminescent thermometer probes with low cost and high sensitivity has become a significant research challenge. This work proposes a strategy that employs lanthanide ions and carbon dots with dual-emission with diverse temperature dependencies to achieve high-temperature sensitivity. Specifically, the fabrication of dual-activated temperature probes has been achieved using NaMgF3:Eu3+/carbon dot nanocomposites through a simple coprecipitation process at room temperature. The optical temperature sensor, NaMgF3:Eu3+/carbon dot, was developed using Eu3+ emission as an internal standard and carbon dot as the temperature signal. The sensor exhibits a substantial absolute sensitivity of 8.3 ± 0.2%K–1 and a relative sensitivity of 2.0 ± 0.1%K–1, both at 300 K, making it a promising candidate for physiological thermometry. Within the temperature range of 300–440 K, the NaMgF3:Eu3+/carbon dot probe shows a relative sensitivity of better than 1.0%K–1 with good excellent repeatability as well as a nearly linear relationship between the Commission Internationale de l’Echlairage chromaticity coordinates of the observed fluorescent color change. The feasibility of the proposed strategy has also been verified by modifying lanthanide ions, e.g., Tb3+. It is anticipated that this pilot study will serve as a springboard for research on dual-mode nanothermometers with superior ratiometric and colorimetric performance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2026
·Vol. 23
·期 1
·e70153
·
IF 2.6
Run Wang,Jian Jiang Bian
We have prepared novel (1- x )[(1- y )NaNbO 3 -yBi(Mg 2/3 Nb 1/3 O 3 )]- x NaMgF 3 (NN-BMN-NMF) ternary oxyfluoride solid solutions and investigated their structural, dielectric, electrical, and energy storage properties in this work. The single BMN-doped solid solution experiences a transformation from the Pbma to the P2 1 ma phase. The NMF and BMN codoping further induce the pseudo-cubic phase Pmmm, exhibiting the coexistence of the P2 1 ma and Pmmm phases. The MgO secondary phase appeared in the high-level doped compositions. The single BMN or NMF-doped composition demonstrates a homogeneous microstructure. However, the codoped ones exhibit a core-shell fine-grain microstructure. The NMF and or BMF doping decreases the polarizability of the solid solution. The single BMN-doping or NMF and BMN-codoping shifts the Tc toward much lower temperatures, accompanied by a broader permittivity maximum, than the same level of single NMF-doping. The NMF ( x = 0.02) and BMN ( y = 0.10) codoped composition achieved optimized energy storage properties with recoverable energy density W rec = 3.76 J/cm 3 , efficiency η = 80.7%, and breakdown strength ( E b ) = 380 kV/cm.
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Li Guowei,Jiang Shihui,Liu Aijun,Ye Lixiang,Ke Jianxi,Liu Caiping,Chen Lian,Liu Yongsheng,Hong Maochun
Crystal-field perturbation is theoretically the most direct and effective method of achieving highly efficient photoluminescence from trivalent lanthanide (Ln 3+ ) ions through breaking the parity-forbidden nature of their 4 f -transitions. However, exerting such crystal-field perturbation remains an arduous task even in well-developed Ln 3+ -doped luminescent nanocrystals (NCs). Herein, we report crystal-field perturbation through interstitial H + -doping in orthorhombic-phase NaMgF 3 :Ln 3+ NCs and achieve a three-orders-of-magnitude emission amplification without a distinct lattice distortion. Mechanistic studies reveal that the interstitial H + ions perturb the local charge density distribution, leading to anisotropic polarization of the F − ligand, which affects the highly symmetric Ln 3+ -substituted [MgF 6 ] 4− octahedral clusters. This effectively alleviates the parity-forbidden selective rule to enhance the 4 f –4 f radiative transition rate of the Ln 3+ emitter and is directly corroborated by the apparent shortening of the radiative recombination lifetime. The interstitially H + -doped NaMgF 3 :Yb/Er NCs are successfully used as bioimaging agents for real-time vascular imaging. These findings provide concrete evidence for crystal-field perturbation effects and promote the design of Ln 3+ -doped luminescent NCs with high brightness.
研究领域:
材料科学
·
纳米技术
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）