JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Ping Xiao,Song Ye,Huazhen Liao,Yanling Shi,Deping Wang
The ability to increase the emission intensity and turn the emission color of upconversion nanocrystals (NCs) will greatly enhance their application scopes. In this research, the sub-10 nm pure β-NaYF 4 : Yb 3+ /Tm 3+ /Ho 3+ core NCs were prepared by using sodium oleate (NaOA) as sodium source instead of the traditional NaOH, based on which the β-NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core-shell NCs were successfully obtained with seed-mediated growth method. The spectral measurement and the calculated CIE color coordinates revealed that the growing of inert NaYF 4 shell on the active NaYF 4 : Yb 3+ /Tm 3+ /Ho 3+ core NCs can not only effectively increase the upconversion emission intensity, but also realize extended tunable emission from blue to orange by turning Ho 3+ concentration, and a strong white light emission with chromaticity coordinates of (0.32, 0.33) can be obtained in the NaY 0.77 F 4 :0.2Yb 3+ /0.01Tm 3+ /0.02Ho 3+ @NaYF 4 core-shell NCs. Furthermore, the extended color tunability and efficient white white-light generation in the core-shell NCs were demonstrated by NCs-PMMA nanocomposites under 980 nm excitation. The results suggested that the β-NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core-shell NCs have promising applications in optoelectronic devices such as light emitting diode and three-dimensional display.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 2
·546-553
·
IF 8.067
Yiying Li,Wenwu You,Jun Zhao,Xiaomin Zhang,Gencai Pan,Pingan Liu,Yanli Mao
Developing smart upconversion materials with novel optical properties is of great significance for applications such as anti-counterfeiting and information encryption, and is always a research frontier and hotspot in this field. Here, a unique smart upconversion material that can respond to the power density and pulse width of the excitation light is reported. The upconversion photoluminescence (PL) color of the developed upconversion material can be changed from red to yellow and then to green when the excitation power density increases from 0.5 to 100 W cm−2. Besides, its upconversion PL color can also be tuned from red to yellow and then to green when the pulse width of the excitation light reduces from 10 to 0.1 ms. Importantly, mechanistic studies show that the transition path of the excited electron of the activator is altered due to the high phonon energy of the host material, and thus the special upconversion luminescence is generated. Furthermore, advanced anti-counterfeiting and information encryption applications are demonstrated by taking advantage of the novel optical properties of the developed upconversion material.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2021
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IF 6.057
Xu Zhao,Ling Zhang,Xu Yan,Li Zhang,Yang Lu,Jialin Pan,Meiling Zhang,Chenguang Wang,Hui Suo,Xiaoteng Jia,Xiaomin Liu,Geyu Lu
Acetylcholinesterase (AChE), as an important neurotransmitter , is widely present in the peripheral and central nervous systems. The aberrant expression of AChE could cause diverse neurodegenerative diseases. Herein, we developed a facile and interference-free fluorimetric biosensing platform for highly sensitive AChE activity determination based on a NaErF 4 : 0.5 % Ho 3+ @NaYF 4 nano-probe. This nano-probe exhibits a unique property of emitting bright monochromic red (650 nm) upconversion (UC) emission under multiband (~808, ~980, and ~1530 nm) near-infrared (NIR) excitations. The principle of this detection relies on the quenching of the strong monochromic red UC emission by oxidization products of 3,3′,5,5′-tetramethylbenzidine generated through AChE-modulated cascade reactions . This system shows a great sensing performance with a detection limit (LOD) of 0.0019 mU mL − 1 for AChE, as well as good specificity and stability. Furthermore, we validated the potential of the nano-probe in biological samples by determination of AChE in whole blood with a LOD of 0.0027 mU mL −1 , indicating the potential application of our proposed platform for monitoring the progression of AChE-related disease.
研究领域:
生物化学
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医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Yujia Peng,Zhimin Yu,Liang Zhao,Yuhang Zhang,Hai Lin
The demand for advanced luminescent perovskites with tunable emission and excellent thermal stability is rapidly growing in secure optical encryption and high-precision temperature sensing. Herein, we develop a multifunctional Cs 2 NaLuCl 6 : Sb 3+ /Ho 3+ /Yb 3+ (CNLC: Sb-Ho-Yb) perovskite that achieves coordinated control of color modulation and thermal robustness. By enabling efficient Sb 3+ →Ho 3+ energy transfer in downshifting (DS) and simultaneously suppressing Ho 3+ nonradiative losses in upconversion (UC), the Sb 3+ -doped strategy significantly enhances both Ho 3+ DS and Ho 3+ -Yb 3+ UC emissions, serving as a foundation for color-coded encryption. The CNLC: Sb-Ho-Yb system further enables dual-mode thermometry by exploiting the contrasting thermal behaviors of its UC (enhanced) and DS (quenched) emissions, allowing for temperature sensing tailored to the specific thermal responses of the respective luminescence mode through two independent fluorescence intensity ratio (FIR) methodologies. Specifically, excitation-wavelength-controlled color switching enables high-security and multi-dimensional optical encryption with strong anti-interference capability, while the high luminescence sensitivity and reversible thermal response ensure high-precision temperature sensing with excellent signal fidelity. Overall, this work establishes a new design paradigm that bridges thermal stability and tunable luminescence in perovskite systems, paving the way toward next-generation intelligent optical encryption and reliable thermal sensing technologies.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 39
·6925-6932
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IF 3.756
Shuai Hu,Maohui Yuan,Changqing Song,Kai Han,Linxuan Wang,Hanchang Huang,Wenda Cui,Zining Yang,Hongyan Wang
Flame spray pyrolysis (FSP) is a potential strategy to scale-up the fabrication of upconversion nanoparticles (UCNPs) from the laboratory to industrial-scale production. The traditional FSP method involves the addition of 2-ethylhexanoic acid (2-EHA) to the precursors to obtain pure homogeneous ultrafine nanoparticles. However, there is still a lack of investigation into how the physical and optical properties are affected by 2-EHA. Here, for the first time, we report the role of 2-EHA in manipulating the morphology, size, and upconversion (UC) properties of Yb3+/Ho3+ co-doped Y2O3 UCNPs. The Y2O3:Yb3+/Ho3+ UCNPs were synthesized by adjusting the molar ratios of 2-EHA to trivalent rare earth ions (RE3+) in the precursor solution via the FSP method. The influence on the morphology and upconversion luminescence (UCL) properties of the UCNPs by 2-EHA was studied in detail. As the ratio of 2-EHA to RE3+ (2-EHA/RE3+) in the precursors increases from 0 to 3, the synthesized UCNPs initially form a mixture of large hollow particles and homogeneous ultrafine nanoparticles at low ratios and then uniform ultrafine nanoparticles at relatively high ratios. The typical green (550 nm) and red (667 nm) UCL reduce as the 2-EHA/RE3+ ratio increases. Moreover, the effect of 2-EHA on the temperature sensing behavior of the Y2O3:Yb3+/Ho3+ UCNPs was evaluated via the fluorescence intensity ratio (FIR) method based on the non-thermally coupled 5F4/5S2 and 5F5 levels of Ho3+ ions. The highest absolute sensitivity (SA) and relative sensitivity (SR) of 6.259% and 0.483% K−1 at 323 K, respectively, were determined and the sensitivity dependence on the 2-EHA/RE3+ ratio of the UCNPs was comparatively estimated.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5210-5217
·
IF 5.976
Shaohua Fan,Guojun Gao,Zhiquan Lin,Weichang Li,Sijun Fan,Shiyu Sun,Hongtao Sun,Lili Hu
High purity green up-conversion (UC) materials have wide applications in fluorescent labeling, plastic recycling and displays, etc. However, Yb3+/Er3+-based UC materials exhibit poor color purity of green light, and their output color is normally unstable under a variable excitation power density, which hinders their application in the aforementioned areas. Herein, we report the highly stable and efficient pure green UC of rod-like β-NaGdF4:Yb3+,Ho3+ submicro-crystals synthesized via a newly developed ion-exchange modified (IEM) method. IEM-derived NaGdF4:Yb3+,Ho3+ monodisperse submicro-crystals present not only a high-purity green output color (due to the large intensity ratio of green to red, IGreen/IRed ≈ 5) but also excellent color stability under varying conditions, such as excitation power density and doping concentration of Yb3+/Ho3+. More importantly, IEM arouses an enormously enhanced UC emission intensity of ∼3700-fold that of the precursor crystals (PC). The UC emission intensity of IEM β-NaGdF4:Yb3+,Ho3+ is ∼4 times stronger than that of its high temperature annealing (HTA) counterpart. The emission intensity of the single green band is ∼40% stronger than that of the IEM β-NaGdF4:20%Yb3+,2%Er3+ submicro-crystals. A proof-of-concept fluorescent labeling of clover patterns (15 × 12 mm) printed from NaGdF4:Yb3+,Ho3+ ink with stable and high purity green fluorescence is demonstrated under excitation with various power densities.
研究领域:
材料科学
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光学
✓ 已验证
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
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IF 5.008
Lining Sun,Yannan Qiu,Tao Liu,Jin Z. Zhang,Song Dang,Jing Feng,Zhijuan Wang,Hongjie Zhang,Liyi Shi
A series of ternary lanthanide β-diketonate derivatives covalently bonded to xerogels (named as Ln-DP-xerogel, Ln = Sm, Yb, Nd, Er, Pr, Ho) by doubly functionalized alkoxysilane (dbm-Si) was synthesized in situ via a sol-gel process. The properties of these xerogel materials were investigated by Fourier-transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM), diffuse reflectance (DR) spectroscopy, thermogravimetric analyses, and fluorescence spectroscopy. The data and analyses suggest that the lanthanide derivatives have been covalently grafted to the corresponding xerogels successfully. Of importance here is that, after excitation with visible light (400–410 nm), the xerogels all show characteristic visible (Sm3+) as well as near-infrared (NIR; Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+) luminescence of the corresponding Ln3+ ions, which is attributed to the energy transfer from the ligands to the Ln3+ ions via an antenna effect. Exciting with visible light is advantageous over UV excitation. Furthermore, to the best of our knowledge, it is the first observation of NIR luminescence with visible light excitation from xerogels covalently bonded with the Sm3+, Pr3+, and Ho3+ derivatives. Compared to lanthanide complexes (Ln = Er, Nd, Yb) functionalized periodic mesoporous organosilica (PMO) materials that exhibit similar optical properties reported in our previous work, the Ln-DP-xerogel (Ln = Sm, Yb, Nd, Er, Pr, Ho) in this case offer advantages in terms of ease of synthesis and handling and potentially low cost for emerging technological applications. Development of near-infrared luminescence of the lanthanide materials with visible light excitation is of strong interest to emerging applications such as chemosensors, laser systems, and optical amplifiers.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Wenzhi Su,Kaiming Kan,Chuancheng Zhang,Yong Zou,Shoujun Din,Qingli Zhang
The influence of alkali and alkaline earth metal ion doping on the upconversion (UC) luminescence properties of Yb3+, Ho3+ co-doped NaBi(MoO4)2 (NBM) single crystals was systematically investigated. A series of Yb3+, Ho3+:NBM single crystals doped with Li+, K+, and Ca2+ ions were successfully grown using the Czochralski method. Their structural characteristics were analyzed through X-ray diffraction (XRD), transmission spectroscopy, and scanning electron microscopy (SEM), confirming a tetragonal crystal structure with space group I41/a. Under 980 nm and 450 nm laser excitation, the crystals exhibited distinct UC emission profiles, with dominant red and green emissions, respectively. Tauc plot analysis indicated that Ca2+ doping introduced donor levels within the crystal lattice, effectively narrowing the optical bandgap. Power-dependent luminescence studies revealed that both red and green UC emissions originated from two-photon excitation processes. Temperature-dependent photoluminescence measurements under both excitation wavelengths demonstrated that codoping with Li+, K+, and Ca2+ significantly enhanced the thermal stability of the luminescent properties. Furthermore, variable-temperature fluorescence lifetime analyses showed that alkali and alkaline earth metal ion doping effectively mitigated the luminescence lifetimes. Overall, the incorporation of Li+, K+, and Ca2+ ions was found to markedly improve both the UC luminescence intensity and thermal robustness of Yb3+, Ho3+:NBM single crystals, offering promising prospects for high-performance luminescent materials.
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高影响因子
Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-12
·
IF 5.418
Wang Linxuan,Li Liang,Yuan Maohui,Yang Zining,Han Kai,Wang Hongyan,Xu Xiaojun
Spectrally determination of temperature based on the lanthanide-doped nanocrystals (NCs) is a vital strategy to noninvasively measure the temperature in practical applications. Here, we synthesized a series of SrF 2 :Yb 3+ /Ho 3+ NCs and simultaneously observed the efficient visible upconversion luminescence (UCL) and near-infrared (NIR) downconversion luminescence (DCL) under 980, 940 and 915 nm excitations. Subsequently, these NCs were further utilized for thermometers based on the Boltzmann (thermally coupled levels, TCLs) and non-Boltzmann (non-thermally coupled levels, NTCLs) of Ho 3+ ions in the first (~ 650 nm), second (~ 1012 nm) and third (~ 2020 nm) biological windows (BW-I, BW-II and BW-III) under tri-wavelength excitations. The thermometric parameters including the relative sensitivity ( \(S_{{\text{r}}}\) ) and temperature uncertainty ( \(\delta T\) ) are quantitatively determined on the I 648 / I 541 (BW-I), I 1186 / I 1012 (BW-II), and I 1950 / I 2020 (BW-III) transitions of Ho 3+ ions in the temperature range of 303–573 K. Comparative experimental results demonstrated that the thermometer has superior performances.
研究领域:
生物医学
·
光学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhenkun Li,Peifen Wang,Xinglong Zhang,Xiaowei An,Xuli Ma,Yongguo Li,Xiao Du,Xiaogang Hao,Guoqing Guan
In this study, a novel electrical Mn-based film was developed for selective potassium (K+) separation, in which delaminated MnOx was obtained with the assistance of Ho3+ using a facile coprecipitation method and coated on carbon paper with poly(vinylidene fluoride) (PVDF) and graphitized carbon black. With the scanning electron microscope (SEM) and transmission electron microscope (TEM) observations, it was found that abundant multiphase interfaces and lattice dislocations appeared on the bulk of Ho-MnOx. Brunauer–Emmett–Teller (BET) analysis verified that the delamination assisted by Ho3+ increased the specific surface area from 110.3 m2/g (MnOx) to 166.8 m2/g (1% Ho-MnOx), which should be beneficial for the exposing of more electrochemical active areas and active sites for K+ adsorption and separation. Particularly, 1% Ho-MnOx had a high concentration of oxygen vacancies and showed a better K+ adsorption ability than MnOx. It was considered that the adsorption of K+ was mainly affected by the ion memory toward K+ for the 1% Ho-MnOx. In addition, the 1% Ho-MnOx film had good stable retention and regeneration capability for the separation of K+; after 10 cycles of adsorption and desorption, the film still retained 87.24% of the maximum adsorption capacity for K+. It is expected to provide an effective preparation method to obtain a high-performance K+ removal film electrode for the separation of K+ under a low concentration.
研究领域:
材料科学
·
电化学
·
环境工程
✓ 已验证
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yue Su,Lifang Yuan,Bo Wang,Sijian Wu,Yahong Jin
Metal halide perovskites (MHPs) have sparked ongoing research interest due to their high-performance optoelectronic properties. However, blue-light excitable near-infrared (NIR) emitting MHPs is still inaccessible and the achievement of robust thermal-quenching resistance so far remains a huge challenge. In this work, we report on the synthesis of lead-free all-inorganic Mn 2+ -based perovskite-like single crystals using the designed nonstoichiometric precursor ratio. The special crystal structure endows Mn 2+ with efficient blue light excitation and red emission, which enables the capabilities of a good matching with commercial blue LED chips and an efficient sensitization for Ln 3+ emitters. The incorporations of Yb 3+ , Er 3+ , and Ho 3+ functionalize the CsMnCl 3 single crystals with multiple NIR emissions by virtue of feeding the energy from Mn 2+ to Ln 3+ via multi-channels. Most remarkable is the achievement of the robust thermal-quenching resistance, exhibiting (near-) zero-thermal-quenching and even anti-thermal quenching, of the Ln 3+ NIR emissions above room temperature . Finally, as a proof-of-concept study, a prototype of an NIR-LED device was fabricated. This work not only provides a general strategy to unlock the blue-light excitable NIR emission from f-f transitions of Ln 3+ ions, and a fundamental understanding of the sensitization-activation mechanisms in Ln 3+ -functionalized manganese (Ⅱ)-based perovskite-like phosphor, but also endows the MHPs with optical functionalities for the future high-potential applications, such as NIR phosphor-converted LEDs, and optical telecommunication.
研究领域:
材料科学
·
光电学
·
光子学
·
固体物理
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）