Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-8
·
IF 5.418
Yuan Maohui,Yang Zining,Yang Xu,Wang Linxuan,Wang Rui,Lan Sheng,Han Kai,Wang Hongyan,Xu Xiaojun
Controlling the upconversion luminescence (UCL) intensity ratio, especially pumped at 808 nm, is of fundamental importance in biological applications due to the water molecules exhibiting low absorption at this excitation wavelength. In this work, a series of β-NaYbF 4 :Er microrods were synthesized by a simple one-pot hydrothermal method and their intense green (545 nm) and red (650 nm) UCL were experimentally investigated based on the single-particle level under the excitation of 808 nm continuous-wave (CW) laser. Interestingly, the competition between the green and red UCL can be observed in highly Yb 3+ -doped microcrystals as the excitation intensity gradually increases, which leads to the UCL color changing from green to orange. However, the microcrystals doped with low Yb 3+ concentration keep green color which is independent of the excitation power. Further investigations demonstrate that the cross-relaxation (CR) processes between Yb 3+ and Er 3+ ions result in the UCL competition. Graphical Abstract
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Muyao Wang,Yanjie Zhang,Zeqing Hu,Jinghui Zhang
The single-phased white light-emitting Ca 4 (PO 4 ) 2 O: Tm 3+ , Tb 3+ , Eu 2+ phosphors with tunable color emission were synthesized by solid-state reaction method. The photoluminescence properties, crystal structure, decay time and cross-relaxation from Tm 3+ to Eu 2+ were investigated in detail. Under excitation of 352 nm, Tm 3+ singly doped Ca 4 (PO 4 ) 2 O (denoted as TTCP) phosphors exhibited an intense emission peak at 458 nm attributed to 1 D 2 → 3 F 4 transition of Tm 3+ ions and a broad emission peak in the range of 400–411 nm ascribed to oxygen vacancies in TTCP host. The emission intensity of oxygen vacancies decreases along with the increasing of Tm 3+ doping concentration due to the substitution of Ca 2+ and oxygen vacancies sites by Tm 3+ ions. For Tm 3+ and Eu 2+ co-doped TTCP phosphors, the blue emission intensity (458 nm) of Tm 3+ ions obviously decreased and the red emission intensity (624 nm) with of Eu 2+ ions increased due to Eu 2+ doping. The cross-relaxation from Tm 3+ to Eu 2+ ions was further demonstrated by the decay times of TTCP: 0.03 Tm 3+ , yEu 2+ phosphors monitoring the emission peak at 458 nm. Further, Tb 3+ ions were also introduced in the TTCP phosphor for a green emission and Tb 3+ singly-doped TTCP phosphor displays the emission peaks at 488 nm and 545 nm due to the typical 5 D 4 → 7 F 5 and 5 D 4 → 7 F 5 transition of Tb 3+ ions, respectively. Finally, TTCP: Tm 3+ , Tb 3+ , Eu 2+ phosphor was obtained and emitted the white light with the blue (458 nm), green (545 nm), and red (603 nm) emission bands under excitation of 352 nm. Especially, white light with tunable color temperature (3000 K–6000 K) and high color rendering index (Ra > 90) can be easily acquired. A neutral white light with high color rendering index (Ra 91.1) can be achieved for the TTCP: 0.03 Tm 3+ , 0.25 Tb 3+ , 0.004Eu 2+ phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yuhan Yang,Yang Lu,Yulei Chang,Qiqing Li,Ting Liu,Yuyao Hong,Rui Li,Xu Yan,Peng Sun,Xiaomin Liu,Geyu Lu
Multipolar resonance and cross-relaxation (CR) are the primary mechanisms of non-radiative energy transfer between rare-earth ions. It is well established that upconversion luminescence is enhanced by suppressing CR-mediated depopulation of high-energy levels through cryogenic fields. However, the role of intermediate-state population processes, particularly those dominated by multipolar resonance, has largely been overlooked. In this study, theoretical derivations and experimental results are combined to distinguish, for the first time, between two types of resonance transfer processes: phonon-releasing transfer (RRT) and phonon-absorbing transfer (ART), and their distinct sensitivities to low temperatures are investigated. In both co-doped and Er 3+ -self-sensitized systems, it is demonstrated that the RRT-mediated intermediate state population process is the key factor in the cryogenic enhancement and modulation of luminescence rather than merely the inhibition of CR. Based on these findings, a novel phenomenon of wavelength-dependent, orthogonal temperature-responsive behavior is reported. This study challenges the current consensus and provides new insights into traditional energy transfer mechanisms.
研究领域:
光学
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材料科学
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 20
·4887
·
IF 4.2
Hui Zeng,Yangbo Wang,Xiaoyi Zhang,Xiangbing Bu,Zongyi Liu,Huaiyong Li
Excitation wavelength controllable lanthanide upconversion allows for real-time manipulation of luminescent color in a composition-fixed material, which has been proven to be conducive to a variety of applications, such as optical anti-counterfeiting and information security. However, current available materials highly rely on the elaborate core–shell structure in order to ensure efficient excitation-dependent energy transfer routes. Herein, multicolor upconversion luminescence in response to both near-infrared I and near-infrared II (NIR-I and NIR-II) excitations is realized in a novel but simple NaYGeO4:Yb3+/Er3+phosphor. The remarkably enhanced red emission ratio under 1532 nm excitation, compared with that under 980 nm excitation, could be attributed to the Yb3+-mediated cross-relaxation energy transfers. Moreover, multi-wavelength excitable temperature-dependent (295–823 K) upconversion luminescence realizes a ratiometric thermometry relying on the thermally coupled levels (TCLs) of Er3+. Detailed investigations demonstrate that changing excitation wavelength makes little difference for the performances of TCL-based ratiometric thermometry of NaYGeO4:Yb3+/Er3+. These findings gain more insights to manipulate cross-relaxations for excitation controllable upconversion in single activator doped materials and benefit the cognition of the effect of excitation wavelength on ratiometric luminescence thermometry.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-11
·
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
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Huimin Li,Shan Wang,Ran Pang,Lihong Jiang,Da Li,Su Zhang,Chengyu Li,Hongjie Zhang
Contactless thermometer based on fluorescence intensity ratio shows unparalleled characteristics compared with traditional contact thermometers. However, few materials are suitable for high temperature (above 573 K) measurement. In this work, Pr 3+ was selected as the emitter and Y 3 GaO 6 :xPr 3+ luminescent thermometers were designed. The phase, crystal structure and morphology were identified using X-ray diffraction, Rietveld refinement and scanning electron microscope. The spectra with multiple ranges were temperature sensitive due to the cross-relaxion mechanism that occurs in the luminescence process. The parameters for temperature measurement were determined based on the peak intensity ratio of 506 and 610 nm at different temperatures (from 293 to 823 K). Y 3 GaO 6 :0.01Pr 3+ displays excellent temperature sensitive performance, in which the relative sensitivity values increase along with the temperature in a wide temperature range and reach 4.09 % K −1 . The thermometric visualization in Y 3 GaO 6 :xPr 3+ can be achieved due to the widely varying luminescence colors at different temperatures.
研究领域:
材料科学
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光学工程
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无机化学
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传感器技术
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功能材料
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 9
·2784-2797
·
IF 6.1
Houhe Dong,Zonghao Lei,Shikun Su,Wenhua Yang,Xuyang Zhang,Wenying Teng,Guangyue Zu,Bing Teng,Degao Zhong
High sensitivity is still a challenge for achieving optical thermometry applications. In this work, we effectively regulated the phonon energy of matrix crystals by substituting the A-site ions in the tellurate double perovskite up-conversion (UC) phosphors of ALaLiTeO6:5%Yb3+,0.2%Tm3+ with Ca2+, Sr2+, and Ba2+. On this basis, a dual-mode thermometer based on the fluorescence intensity ratio of FIR1 = I694/I649 and FIR2 = I694/I475 was constructed by utilizing significant differences in the response to temperature changes between 649 nm/475 nm emissions (from both Yb3+ and Tm3+) and 694 nm UC emission (from Yb3+ → Tm3+). As the temperature increases, involving the assistance of matrix crystal phonon energy, the collaborative action of two non-radiative transitions (Tm3+) and three cross-relaxation processes (Tm3+–Tm3+) can degrade the emission intensity at 475 and 649 nm, but enhance the UC emission intensity at 694 nm, thus effectively improving the thermometry sensitivity. Finally, we achieved the maximum thermometry sensitivity values of Sr = 4.69% K−1 and Sa = 10.05% K−1. These results provide new insights into exploring and constructing ultra-sensitive optical temperature sensors.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Chemical Science
·
2017
·Vol. 8
·期 7
·5050-5056
·
IF 8.668
Zhu Zhuo,Yongsheng Liu,Dajiu Liu,Ping Huang,Feilong Jiang,Xueyuan Chen,Maochun Hong
Energy transfer (ET) is of fundamental importance in tuning the optical performance of lanthanide-doped upconversion nanoparticles (UCNPs). However, the fine control and manipulation of the ETs particularly for deleterious cross-relaxation type ETs (CR-ETs) in lanthanide-doped UCNPs remains a formidable challenge to date. Herein, we demonstrate a rational design strategy to manipulate the deleterious CR-ETs in lanthanide-doped UCNPs, by fine-tuning the distances at an extremely large length scale (>20 nm) among multiple lanthanide dopants that are simultaneously embedded into one single nanoparticle with specially designed multilayer nanostructures. The successful inhibition of the CR-ETs leads to a significantly enhanced upconversion luminescence signal with an intensity ∼70 times higher than that of co-doped conventional UCNPs. This finding paves a new way for the better control of the ETs in lanthanide-doped nanoparticles, and offers the possibility of constructing a series of promising single-nanocrystal-based anti-counterfeiting barcodes with well-identified UC emission color and lifetime outputs.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2023
·
IF 19
Zhihui Rao,Mengyan Cao,Zehui Chen,Xiujian Zhao,Xiao Gong
Ho-based lead-free double perovskite microcrystals (MCs), Cs 2 NaHo 1-x Yb x Cl 6 , are synthesized and demonstrated to be promising optical temperature sensing materials by understanding the concentration-dependent upconversion (UC) luminescence mechanisms. By optimizing the dopant concentration, a dominant emission shifting from red to green is successfully achieved in an activator-rich system. During this process, the red to green emission intensity ratio (R/G) can be changed from 12.5 (pure red light) to 0.14 (pure green light). It is clarified that the cross-relaxation (CR) process between activator and the energy transfer process between Yb 3+ and Ho 3+ are the key mechanisms of UC luminescence intensity and R/G ratio variation. Moreover, the intensity of red and green UC emission shows strong dependence on temperature, resulting from the competition between CR and energy transfer in the emission levels. The high-sensitivity Ho-based thermometer can be obtained by Cs 2 NaHo 0.99 Yb 0.01 Cl 6 MCs with bright red UC luminescence, whose fluorescence intensity ratio thermometer gains maximum relative sensitivities reaching 0.68% K −1 at 400 K. The multicolor UC luminescence quantitative modeling mentioned here is crucial for understanding the concentration-dependence UC luminescence characteristics and to optimize the design of the Ho-based thermometer. This study can be an extension of the application range for perovskite UC materials.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 11
·1-8
·
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
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bowen Chen,Chenxia Li,Degang Deng,Fengping Ruan,Ming Wu,Le Wang,Yanting Zhu,Shiqing Xu
In this study, Eu 2+ /Eu 3+ coexisting perovskite LaAlO 3 phosphors were synthesized by a traditional high-temperature solid-phase reaction method and investigated via X-ray diffraction data, X-ray photoelectron spectroscopy and temperature-dependent photoluminescence spectra. The Eu 2+ /Eu 3+ coexisting LaAlO 3 phosphors exhibit excellent optical temperature sensing characteristics and are potential inorganic materials for temperature detection. The measured maximal absolute temperature sensitivity reaches 0.014 K -1 , and the corresponding largest relative temperature sensitivity is 1.193% K −1 , which are superior to most of previous reports of that. Meanwhile, the monitored signal peaks are well separated, providing a good signal discriminability. The energy level crossover relaxation of Eu 2+ and Struck-Fonger crossover process involving O 2– -Eu 3+ charge transfer band were used to explain the different temperature-dependent responses of Eu 2+ and Eu 3+ . This work may give new ideas for the future research of optical thermometric materials with high sensitivity and high discriminability.
研究领域:
材料科学
·
无机化学
·
光学工程
·
传感器技术
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Xiuna Tian,Hongjian Dou,Youfeng Wen,Lingyuan Wu,Changjun Wang,Zongwei Zhang,Youzi Zhang
In the field of disease diagnosis and treatment, achieving highly sensitive temperature sensing via non-contact methods based on fluorescence continues to present a significant challenge. This study investigated the influence of the cross-relaxation (CR) process of Tm 3+ ions at varying concentrations and the negative thermal expansion (NTE) property of the matrix on the luminescent properties of Sc 2 (MoO 4 ) 3 :Yb 3+ /Tm 3+ materials under diverse temperature conditions, and further evaluated their potential application value in the field of temperature sensing. At room temperature, the analysis of the concentration dependence of the emission spectra reveals that the intensities of the emission peaks originating from higher energy levels ( 1 G 4 , 3 H 4 , and 3 H 5 ) and the lowest excited state ( 3 F 4 ) exhibit significant variation with the doping concentration. As the doping concentration increases, the temperature enhancement factor for the fluorescence intensity of high-energy level transition ( 1 G 4 → 3 H 6 ) progressively decreases from 21.6 to 1.2. In contrast, the temperature enhancement factor for the lowest excited state transition ( 3 F 4 → 3 H 6 ) markedly increases from 471 to 2964. At a concentration of 8%, the temperature extension factor of the fluorescence lifetime at 1627 nm ( 3 F 4 → 3 H 6 ) can reach 7.2, whereas at a concentration of 0.5%, this factor is 2.7. These suggests that the CR process between Tm 3+ ions exerts markedly distinct influences on the luminescence intensities and lifetime in Sc 2 (MoO 4 ) 3 :Yb 3+ /Tm 3+ materials. In addition, this study employs the fluorescence intensity ratio of I 1629 nm / I 1197 nm for temperature sensing, thereby achieving high sensitivity in temperature measurement.
研究领域:
光学材料
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发光材料
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温度传感
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固体物理
·
生物医学工程
✓ 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）