Nature Communications
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2019
·Vol. 10
·期 1
·1-11
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IF 11.878
Mei Qingsong,Bansal Akshaya,Jayakumar Muthu Kumara Gnanasammandhan,Zhang Zhiming,Zhang Jing,Huang Hua,Yu Dejie,Ramachandra Chrishan J. A.,Hausenloy Derek J.,Soong Tuck Wah,Zhang Yong
Reliance on low tissue penetrating UV or visible light limits clinical applicability of phototherapy, necessitating use of deep tissue penetrating near-infrared (NIR) to visible light transducers like upconversion nanoparticles (UCNPs). While typical UCNPs produce multiple simultaneous emissions for unidirectional control of biological processes, programmable control requires orthogonal non-overlapping light emissions. These can be obtained through doping nanocrystals with multiple activator ions. However, this requires tedious synthesis and produces complicated multi-shell nanoparticles with a lack of control over emission profiles due to activator crosstalk. Herein, we explore cross-relaxation (CR), a non-radiative recombination pathway typically perceived as deleterious, to manipulate energy migration within the same lanthanide activator ion (Er 3+ ) towards orthogonal red and green emissions, simply by adjusting excitation wavelength from 980 to 808 nm. These UCNPs allow programmable activation of two synergistic light-gated ion channels VChR1 and Jaws in the same cell to manipulate membrane polarization, demonstrated here for cardiac pacing.
研究领域:
材料科学
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生物物理学
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纳米技术
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光遗传学
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DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 11
·1-8
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IF 1.784
Zhou Xinquan,Ju Guifang,Dai Tiansong,Li Yang,Wu Haoyi,Hu Yihua
Long-persistent phosphor and up-conversion particles used for optical imaging continue to interest researchers. The present work identifies an Er 3+ doped micro-sized CSAO-CSO mixed material that exhibits both up-conversion and persistent luminescence. The cross-relaxation that occurs among Er 3+ ions contributes to enhancing the up-conversion intensity. The Tm 3+ /Ho 3+ co-doped strategy was used to induce tunable up-conversion colors. The cross-relaxation process corresponding to the energy transfer mechanism was investigated via the luminescence lifetimes of Er 3+ . Moreover, the persistent luminescence and thermo-luminescence properties of CSAO-CSO: Er 3+ were also investigated systematically. Our results combine the fields of up-conversion and persistent luminescence, which may support other explorations of new kinds of long-persistent and up-conversion materials.
研究领域:
材料科学
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生物医学工程
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光学成像
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产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Yang Xingru,Sheng Yuhang,Zhang Linglong,Yang Lun,Xing Fangjian,Di Yunsong,Liu Cihui,Hu Fengrui,Yang Xifeng,Yang Guofeng,Liu Yushen,Gan Zhixing
Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn 2+ /Yb 3+ /Er 3+ tri-doped Cs 2 Ag 0.8 Na 0.2 InCl 6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn 2+ d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn 2+ and Er 3+ . After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn 2+ and Er 3+ ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn 2+ , Ln 3+ , and traps, laying a solid foundation for future development of new lead-free perovskites.
研究领域:
材料科学
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光学
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化学
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物理学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Yuanhao Chen,Xiaoshan Zhang,Yirong Liu,Haisheng Liu,Dechao Yu,Dawei Zhang
Gadolinium gallium garnet has been emerging as a starlet for preparing efficient luminescent materials, while via crystal field engineering the luminescence properties of rare-earth activator in its solid solution phosphors were scarcely explored. In this work, Er 3+ -doped Gd 3 Zn x Ga 5-2x Ge x O 12 (GZG 5- 2x G:Er 3+ ) solid solutions were prepared by high-temperature solid-state reaction, where a hetero-valent co-substitution strategy was implemented via introducing Zn 2+ /Ge 4+ pair to replace 2 Ga 3+ sites. X-ray diffraction Rietveld refinements confirm all samples crystallized into pure garnet phase. Upon 381 nm excitation, Er 3+ concentration was spectrally optimized to be about 10%, substituting the Gd 3+ sites, and via the Zn 2+ /Ge 4+ co-substitution, luminescence intensity of GZG 2 G:10%Er 3+ increases by more than 3 times in comparison with that of the baseline GZGG:10%Er 3+ sample. All the GZG 5-2x G:10%Er 3+ solid solution samples color in bright green under illumination using an ultraviolet ~ 365 nm lamp.Thermometric properties of Er 3+ 2 H 11/2 -4 S 3/2 thermally coupled levels of were systematically studied on basis of fluorescence intensity ratio principle. The GZG 5-2x G:10%Er 3+ all can perform temperature sensing over a wide temperature range of 298-573 K with a maximum relative sensitivity (S r ) above 1.20% K -1 and an applicable minimum temperature resolution (δT) around 0.4 K. Continuous exploration of solid solution-manipulating luminescent properties would develop novel thermometry probes (particularly for activator with spin-allowed transitions) with higher S r and smaller δT for practical optical temperature sensing.
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DOI
高影响因子
Materials Research-Ibero-american Journal of Materials
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2019
·
IF 1.104
Dan Ho Kim,Tap Tran Duy,Nguyen-Truong Hieu,Ty Nguyen Minh,Zhou Dacheng,Qiu Jianbei
The SiO2-Al2O3-BaF2-TiO2-CaF2 transparent silicate glass-ceramics containing BaF2 nanocrystals were successfully prepared by heat treatment process through conventional melting method. Effects of heat treatment processes and Yb3+ concentration on the downconversion (DC) emission of the co-doped Er3+/Yb3+ transparent silicate glass-ceramics were investigated. With the increase of temperatures and times of heat treatment process, the DC emission intensity of the co-doped Er3+/Yb3+ glass-ceramics was significantly enhanced. At the same time, with the increase of Yb3+ concentration, the value of DC intensity of Er3+/Yb3+ co-doped bands centered at 849, 883 and 1533 nm is maximized when the concentration of Yb3+ reaches 2.5 mol.%. When the concentration exceed 2.5 mol. %, the DC emission intensity of Er3+/Yb3+ co-doped bands centered at 849, 883 and 1533 nm was decreased, owing to the self-quenching effect. It’s interesting that the DC emission intensity of Er3+/Yb3+ co-doped band centered at 978 nm didn’t quench when the Yb3+ concentration exceed 2.5 mol. %. At the same time, the DC mechanism and ET processes between Yb3+ and Er3+ ions were discussed.
研究领域:
材料科学
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光学
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DOI
高影响因子
Nanophotonics
·
2020
·Vol. 9
·期 6
·1519-1528
·
IF 7.491
Xiaoru Dai,Ke Wang,Lei Lei,Shiqing Xu,Yao Cheng,Yuansheng Wang
Lanthanide up-conversion features stepwise multi-photon processes, where the difference in photon number that is required for specific up-conversion process usually leads to significant variance in pumping-related processes/properties. In this work, a pumping-controlled dual-mode anti-counterfeiting strategy is conceived by taking advantage of the combination of up-conversion processes with different photon numbers. The combination of Er 3+ and Tm 3+ , which are spatially separated within a designed core/triple-shell nano-architecture, is taken as an example to illustrate such idea. Upon infrared excitation, the emission color of a designed pattern can be switched from red to purple by increasing the excitation power density from 5 to 11 W/cm 2 , while a bright luminescent trajectory including red, white and blue-green color with different length is observed when rotating the pattern above 600 rpm. In addition, the relative up-conversion emission intensities of the Er 3+ and Tm 3+ ions can be manipulated through tailoring interfacial or inner defects in the core/triple-shell nano-crystals, which enable an ultrahigh sensitivity for the pumping-controlled emission color variation to be observed under excitation power well below 11 W/cm 2 .
研究领域:
材料科学
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纳米技术
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光学
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光子学
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产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jiang Zhao,He Liangrui,Yang Zhiwen,Qiu Huibin,Chen Xiaoyuan,Yu Xujiang,Li Wanwan
Distinctive upconversion or downshifting of lanthanide nanocrystals holds promise for biomedical and photonic applications. However, either process requires high-energy lasers at discrete wavelengths for excitation. Here we demonstrate that co-sensitization can break this limitation with ultrawide excitation bands. We achieve co-sensitization by employing Nd 3+ and Ho 3+ as the co-sensitizers with complementary absorptions from the ultraviolet to infrared region. Symmetric penta-layer core-shell nanostructure enables tunable fluorescence in the visible and the second near-infrared window when incorporating different activators (Er 3+ , Ho 3+ , Pr 3+ , and Tm 3+ ). Transient spectra confirm the directional energy transfer from sensitizers to activators through the bridge of Yb 3+ . We validate the features of the nanocrystals for low-powered white light-emitting diode-mediated whole-body angiography of mice with a signal-to-noise ratio of 12.3 and excitation-regulated encryption. This co-sensitization strategy paves a new way in lanthanide nanocrystals for multidirectional photon conversion manipulation and excitation-bandwidth-regulated fluorescence applications.
研究领域:
纳米技术
·
生物光子学
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材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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