INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xiaolong Chen,Xiangyu Chen,Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Qinfang Zhang,Jing Feng
Internal OH– defects always cause significant depletion of excitation energy for low upconversion efficiency; however, preventing the incorporation of OH– into the crystal lattice is very difficult during the synthesis of upconversion crystals. In this work, red upconversion emission is dramatically enhanced in Er3+-sensitized hexagonal NaLuF4 (β-NaLuF4) microcrystals through a collaborative effect of ion exchange and Tm3+ doping. The ion exchange can not only maintain the morphology very well but also strongly reduce the internal OH– defects, which can enhance the upconversion luminescence due to improved excitation energy harvesting and red to green (R/G) ratio due to intense cross-relaxation. Doping of Tm3+ as an energy trapping center not only regulates the red emission output but also reduces the excitation energy loss. β-NaLuF4:Er,Tm microcrystals after ion exchange exhibit stronger red upconversion emission compared with β-NaYF4:Er,Tm and β-NaGdF4:Er,Tm counterparts. Moreover, fluorescent labeling of the fingerprint pattern printed from β-NaLuF4:Er,Tm microcrystals with stable and intense red fluorescence has been demonstrated under 980 nm excitation.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 8
·1359-1367
·
IF 3.117
Qinqin Shao,Chao Yang,Xiaoxu Chen,Hong Zhang,Guoying Feng,Shouhuan Zhou
Lanthanide doped hexagonal phase (β) rare earth fluoride (NaREF4) nanocrystals have considerable potential in laser and, especially, biological applications. However, their large size and extreme synthetic conditions have become unavoidable obstacles in their path to various applications. Herein, a core-mediated hetero-shell growth method was adopted to synthesize α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals, in which cubic phase (α) NaGdF4 was used as the core to induce the subsequent growth of a β-NaLuF4:Nd3+ shell via a two-step solvothermal reaction. The resulting α-NaGdF4@β-NaLuF4:Nd3+ core–shell nanocrystals were characterized by structural analysis, photoluminescence spectroscopy and decay lifetime. Besides, a persuasive lattice-disordered heterointerface-induced mechanism was proposed to understand the core-mediated hetero-shell growth. Meanwhile, the influence of the heterointerface on the dynamic growth of the shell nanocrystals was also investigated in detail. Most importantly, the near-infrared luminescence intensity at 1.06 μm was enhanced by over two times via coating the lattice-matched homogeneous NaLuF4 shell on the surface of α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals. The high-performance α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals thus obtained are expected to be used for laser output and depth detection of biological tissues.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Yue Wang,Yaomin Lei,Wuqin Chen,Ruian Yang,Xinyang Gu,Gaofeng Pan,Xuesong Zhai,Jinshan Wang
Luminescence quenching effect of lanthanide-doped upconversion materials occurs with high probability even in larger-sized particles, but their main quenching pathway remains controversial. In this work, we investigate the influence of the surfactant and pH value on the luminescence properties of β-NaLuF 4 :Yb,Er microcrystals. A convincing evidence can be provided by the combination of X-ray diffraction (XRD), inductively coupled plasma (ICP) spectrometer, and Eu 3+ structural probe measurements that the major quenching pathway comes from the fast energy migration from the excited lanthanides to nearby OH − defects in the crystal lattice rather than surface quenching effect. Even at OH − -rich reactant condition, the upconversion luminescence intensity becomes more efficient by reduced internal quenching effects. Our findings provide a new and fundamental understanding of severe luminescence quenching effect at microscale, thus guiding the design and preparation of highly efficient upconversion materials.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 38
·15682-15690
·
IF 5.7
Guotao Xiang,Yuanyuan Yi,Zhen Liu,Yanhong Li,Zhiyu Yang,Yongjie Wang,Sha Jiang,Xiao Tang,Xianju Zhou,Li Li,Xiaojun Wang,Jiahua Zhang
Developing efficient photocatalysts that respond to near-infrared (NIR) light holds significant scientific importance for improving the utilization of solar energy. In this study, the photocatalyst β-NaLuF4:Yb3+/Tm3+@TiO2 that simultaneously responds to both ultraviolet (UV) and NIR light is successfully synthesized. Instead of the conventional use of β-NaYF4:Yb3+/Tm3+, β-NaLuF4:Yb3+/Tm3+ upconversion (UC) nanoparticles (NPs) are employed as the NIR-UV light converter to achieve stronger UV UC luminescence. The data indicate that the photocatalytic degradation efficiency and rate of β-NaLuF4:Yb3+/Tm3+@TiO2 synthesized in this work are superior to those of NIR-driven photocatalysts based on β-NaYF4:Yb3+/Tm3+ under both NIR and sunlight irradiation. Further analysis of the UC emission spectra and the decay curves of the samples reveals an effective fluorescence resonance energy transfer (FRET) process between β-NaLuF4:Yb3+/Tm3+ and TiO2 after the combination, which makes the NIR-driven photocatalytic reactions happen. All results confirm that the present β-NaLuF4:Yb3+/Tm3+@TiO2 is an exceptionally efficient photocatalyst, owing to its responsiveness to both UV and NIR light.
研究领域:
材料科学
·
光化学
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2022
·
IF 4.632
Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Meng He,Jing Feng
In this work, monodisperse β-NaLuF 4 :Yb,Er microcrystals with intense upconversion emission were synthesized via a modified hydrothermal method . With the increase of reactant concentration, their production yield is increased obviously, and the upconversion emission intensity in β-NaLuF 4 :Yb,Er microcrystals is also enhanced significantly. The luminescence enhancement should be attributed to minimal internal OH − defects, validated by a combination of analytical X-ray diffraction (XRD), energy dispersive spectrum (EDS), and Eu 3+ structural probe measurements. We also reveal that high Na + :RE 3+ ratio in the β-NaLuF 4 :Yb,Er microcrystals prepared under Na + -rich reaction will arouse the increased repulsive energy of β-NaLuF 4 microcrystals between F − and OH − anions and then facilitate the substitution of large OH − ions by small F − ions under F − -rich reaction conditions. Minimal OH − concentrations can limit nonradiative relaxation and promote excitation energy harvesting for high upconversion efficiency. The presented results not only offer a facile method for the simultaneous production yield and luminescence intensity increase of β-NaREF 4 microcrystals, but also uncover a better insight into the upconversion emission alterations, which is favorable to broaden their practical applications.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3722-3725
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IF 1.339
Song Weiye,Guo Xingyuan,He Guanghui,Qin Weiping
β-NaLuF4:20%Yb,0.5%Tm,x%Gd (x = 10,20, 30) nanocrystals were synthesized by high temperature thermal decomposition method. X-ray diffraction (XRD) show the as-prepared samples are characteristic of a pure β-NaLuF4. Transmission
electron microscope (TEM) investigations indicate the nanocrystals have particle size of ∼85 nm with good monodispersity and well-defined crystallographic facets. Particularly, under 980 nm excitation, upconversion (UC) emissions in the UV range of 270–320 nm were observed in these
nanocrystals, which further prove that β-NaLuF4 is an excellent host for building UV compact solid-state lasers or fiber lasers.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Chen Zhang,Chuan Ding,Mingyue Li,Jinyang Zhou,Tao Yuan,Zhemin Shen
The infrared energy of the sun’s rays accounts for more than 40 %. Heterostructures were constructed to enable broad-spectrum response of photocatalysts, and enhance the utilization of sunlight, especially that of infrared lights. A robust heterostructured upconversion composite material decorated with Ag nanoparticles (AgNPs), β-NaLuF 4 @ NaLuF 4 :Yb 3+ ,Tm 3+ @ AgNPs@BiOBr (NLF@NLFT@Ag@Bi), was built through a multi-step hydrothermal method. NLF@NLFT@Ag@Bi demonstrates enhanced photocatalytic activity under UV–Vis-NIR, Vis-NIR, and NIR irradiation compared to pure BiOBr and NLF@NLFT@Ag/BiOBr mixture, achieving 99 % Rhodamine B (RhB) degradation in 0.5 h (UV–Vis-NIR) and 96 % in 3 h (NIR), with degradation over 80 % for Bisphenol A (BPA), Norfloxacin (Nor), and Methyl Orange (MO) in 3 h (UV–Vis-NIR). The upconversion luminescence (UCL) of NLF@NLFT@Ag is tuned by its core–shell structure and AgNPs’ plasmonic effect, while NLF@NLFT@Ag@Bi’s enhanced photocatalysis arises from boosted UCL and AgNPs-facilitated Förster resonance energy transfer (FRET) between NLFT and BiOBr. The material’s efficacy in infrared-driven photocatalysis offers a prospective approach for extending catalyst response ranges. It greatly enhances degradation effects of organic pollutants under sun’s rays.
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DOI
高影响因子
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