OPTICAL MATERIALS
·
2021
·
IF 3.08
Linxuan Wang,Xu Yang,Maohui Yuan,Zining Yang,Kai Han,Hongyan Wang,Xiaojun Xu
In this work, a series of Nd 3+ and Yb 3+ codoped SrF 2 nanocrystals (NCs) were synthesized by the hydrothermal method . The TEM results show that the average size of these NCs is approximately ∼50 nm. The structure of SrF 2 NCs and its optical properties of near-infrared (NIR) downconversion luminescence (DCL) are systematically characterized. Under the excitation of 808 nm laser, intense NIR DCL centered at 976 nm from Yb 3+ ions is experimentally determined. The mechanism of the DCL is further interpreted based on the efficient energy-transfer (ET) processes from Nd 3+ to Yb 3+ . In addition, utilizing the fluorescence intensity ratio (FIR) technique, the temperature sensing behaviors of SrF 2 :Nd 3+ /Yb 3+ (15/4 mol%) are also investigated through the heterogeneously coupled states between Nd 3+ ( 4 F 3/2 → 4 I 11/2 ) and Yb 3+ ( 2 F 5/2 → 2 I 7/2 ) in a temperature range of 298–573 K. The results confirm that the maximum thermal sensitivity is up to 0.00346 K −1 at 473K. The excellent thermal sensitivity of these NCs, particularly the DCL located at the NIR region, have the potential for biological applications and temperature measurement at the nanoscale .
研究领域:
材料科学
·
光学
·
生物医学工程
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DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 27
·10612-10622
·
IF 4.569
Yuhong Zhang,Pengcheng Wang,Haiyan Wang,Xingke Zheng,Yibin Guo,Nan Zhang,Hang Liu
Phosphors with rare earth (RE) ions are widely applied to optical temperature measurements. Moreover, the near-infrared (NIR) emission of phosphors has potential applications in the biological field. Herein, Gd2O3:x%Nd3+/Yb3+(0.2 ≤ x ≤ 0.8) samples are successfully synthesized by the sol–gel method, and their phase and morphology are characterized. The XRD data are refined by Rietveld. Under 980 nm continuous wave (CW) laser excitation, the upconversion (UC) and downshift (DS) emissions are studied. The temperature sensing performances of thermally coupled levels (TCLs) and non-thermally coupled levels (non-TCLs) of Gd2O3: Nd3+/Yb3+ phosphors are investigated through the fluorescence intensity ratio (FIR) technology. In the temperature range of 303–523 K, the maximum relative sensitivity of I761 nm/I550 nm reaches 6.54% K−1, which is based on non-TCLs. At the same time, the maximum relative sensitivity of I761 nm/I1000 nm–1500 nm reaches 3.13%. In addition, the influence of the laser induced heating (LIH) effect is studied. Compared with square wave (SW) pumping, the relative sensitivity would decrease at CW excitation. Finally, the durability and temperature uncertainty are also discussed. The results prove that the Gd2O3:Nd3+/Yb3+ samples present higher relative sensitivity and durability and lower temperature uncertainty in the biological window. Therefore, the phosphors can be used as optical thermometers in the biological field.
研究领域:
材料科学
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生物医学工程
·
光学
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DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Solomon Tiruneh Dibaba,Yao Xie,Wensong Xi,Artur Bednarkiewicz,Wei Ren,Lining Sun
Combining treatment and diagnosis, called theranostics, which is achieved within single nanoparticle is an ultimate goal of many studies. Herein, we developed a new nanotheranostic agent − Nd 3+ -sensitized upconversion nanoparticles core for dual modal imaging (i.e., upconversion luminescence imaging and magnetic resonance imaging) and antimony nanoshell for photothermal therapy (PTT). The core-shell-shell upconversion nanoparticles (NaYF 4 :Yb,Er@NaYF 4 :Yb,Nd@NaGdF 4 :Nd, named as UCNP) were firstly synthesized using thermal decomposition method and then were coated by antimony shell over the surface of UCNP using simple cost and time effective new method. Furthermore, the surface of UCNP@Sb nanostructures was modified with DSPE-PEG in order to enhance the water solubility and biocompatibility. The final nanotheranostic agent, named as UCNP@Sb-PEG, exhibits very low toxicity, good biocompatibility, very good photothermal therapeutic effect, and efficient upconversion luminescence (UCL) imaging of HeLa cells under only one laser (808 nm) irradiation. The antimony shell is quenching the upconversion emission in pristine nanotheranostic agent, but interestingly, the UCL intensity of the agent recovers progressively under 808 nm laser irradiation due to light induced degradability of antimony shell. Besides, high longitudinal relaxivity ( r 1 ) obtained from the experiment approves excellent potential of the nanotheranostic agent for T 1 -weighted magnetic resonance imaging application.
研究领域:
纳米医学
·
生物材料
·
肿瘤学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiaqi Wang,Xin Ding,Tongtong Gao,Huiling Zheng,Xuejiao Wang,Qiushi Wang,Cailong Liu
Due to the characteristics of non-contact, high sensitivity and spatial resolution, nanoscale optical thermometry is necessary in many applications such as micro/nano electronics, integrated optics and biomedicine. Herein, we report the synthesis of Nd 3+ /Yb 3+ co-doped AlN (AlN:Nd 3+ /Yb 3+ ) nanorods using an arc discharge method and investigate their phase, composition and morphology using XRD, Raman, XPS, EDS, ICP, SEM and TEM. The nanorods with rectangular cross-section are highly single crystalline and have a uniform smooth surface. Upon excitation at 980 nm, AlN:Nd 3+ /Yb 3+ nanorods exhibit up-conversion (UC) visible emission bands (around 544, 595 and 667 nm) and near-infrared emission bands (around 755 and 806 nm), which correspond to intra-4f electron transitions of the Nd 3+ ions. Later, the temperature dependence of UC luminescence behavior was systemically studied using luminescence intensity ratio (LIR) technique. It was verified that LIRs with non-thermally coupled levels ( 4 G 7/2 / 4 F 5/2 or 4 G 7/2 / 4 F 7/2 ) are suitable for temperature sensing. The maximum relative sensitivity based on 4 G 7/2 / 4 F 7/2 is 4.63% K −1 at 298 K, which is one of the highest values reported for optical thermometers. This work provides an efficient method for synthesizing wide-band gap semiconductors with doped size-mismatched functional atoms that can be used for high-sensitivity optical thermometry.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 8
·2063
·
IF 5.076
Zihao Zhao,Xiang Zhao,Mu Zhang,Xudong Sun
Surface-enhanced Raman scattering (SERS) for semiconductor nanomaterial systems is limited due to weak Raman signal intensity and unclear charge-transfer (CT) processes for chemical enhancement. Here, rare-earth element neodymium-doped titanium dioxide (Nd-TiO2) nanoparticles (NPs) were synthesized by the sol–gel method. The characterizations show that the doping of Nd ions causes TiO2NPs to show an increase in the concentration of defects and change in the energy level structure. The CT process between Nd-TiO2NPs substrate and probe molecule 4-Mercaptopyridine (4-Mpy) was innovatively analyzed using the relative energy level location relationship of the Dorenbos model. The SERS signal intensity exhibits an exponential enhancement with increasing Nd doping concentration and reaches its optimum at 2%, which is attributed to two factors: (1) The increase in the defect concentration is beneficial to the CT process between the TiO2and the probe molecule; (2) the introduction of 4felectron orbital energy levels of rare-earth ions created unique CT process between Nd3+and 4-Mpy. Moreover, the Nd-TiO2NPs substrate shows excellent SERS performance in Raman signal reproducibility (RSD = 5.31%), the limit of detection (LOD = 10−6M), and enhancement factor (EF = 3.79 × 104). Our work not only improves the SERS performance of semiconductor substrates but also provides a novel approach to the development of selective detection of probe molecules.
研究领域:
材料科学
·
光谱学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Li Li,Yidong Li,Yongjie Wang,Faling Ling,Zhiyu Yang,Sha Jiang,Guotao Xiang,Peng Du,Xianju Zhou,Dengfeng Li
Flexible scintillator screens with excellent stability and high spatial resolution are crucial for non-planar X-ray imaging applications. Lead-free rare-earth halide double perovskites (DPs) have emerged as formidable contenders in the scintillator field due to their unique advantages, environmental friendliness, high quantum efficiency, facile synthesis, and tunable emission wavelength etc. Herein, Nd 3+ -doped Cs 2 NaScCl 6 (CNSC) micron crystal with a high near-infrared (NIR) emission quantum efficiency of 76% were successfully synthesized using a simple hydrothermal method. The systematic optical characterization unveiled, for the first time, anti-thermal quenching effect induced by Nd 3+ doping in DPs. Subsequently, large-area, flexible CNSC: Nd 3+ @PDMS scintillator for X-ray imaging were developed, demonstrating excellent mechanical stability (Without attenuation after 5000 bendings), ultra-high spatial resolution (24 lp/mm), and exceptional operational stability (The signal intensity was enhanced after continuous irradiation). These research results not only enhance the understanding of anti-thermal quenching in DPs, but also promote the development of NIR high-efficiency ultra-flexible scintillator.
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DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 45
·期 4
·1708-1716
·
IF 4.197
Fei He,Chunxia Li,Xinyang Zhang,Yinyin Chen,Xiaoran Deng,Bei Liu,Zhiyao Hou,Shanshan Huang,Dayong Jin,Jun Lin
808 nm excited upconversion nanoparticles (UCNPs) have received extensive attention in the biomedical areas. However, one of the limitations of UCNPs is their lower luminescence efficiency. Aimed at this problem, a series of BaGdF5-based UCNPs were prepared by a layer-by-layer procedure. And UC luminescence properties are optimized by varying the doping concentration of rare earth ions, amount and types of shells. It is found that if the amount of core BaGdF5:20%Yb3+/2%Er3+ was fixed at 0.5 mmol, the optimized conditions of three shell layers are 0.3 mmol of BaGdF5:10%Yb3+, 0.5 mmol of BaNdF5 and 0.5 mmol of BaGdF5. Thus the UC luminescence intensity of the resultant nanoparticles BaGdF5:20%Yb3+/2%Er3+@BaGdF5:10%Yb3+@BaNdF5@BaGdF5 (Er@Yb@Nd@Gd) is enhanced more than four times compared with that of BaGdF5:20%Yb3+/2%Er3+@BaGdF5:10%Yb3+@BaNdF5 (Er@Yb@Nd). To further improve the biocompatibility and applications in the biological field, carboxymethyl chitosan (CMC), a type of biocompatible water-transfer agent, was used as a capping ligand to modify the surface of Er@Yb@Nd@Gd. An antitumor drug doxorubicin (DOX) was loaded to the CMC-modified Er@Yb@Nd@Gd nanocarriers by electrostatic interactions. The DOX can be selectively released in an acidic environment, which shows a pH-triggered drug release behavior. On the other hand, Er@Yb@Nd@Gd nanoparticles have excellent magnetic properties due to the presence of Gd components. T1-weighted magnetic resonance imaging (MRI) reveals the concentration-dependent brightening effect with longitudinal relaxivity (r1) as high as 43.77 s−1 (mM)−1, much higher than that of previous Gd3+-based counterparts. The results indicate that this multifunctional drug delivery system is expected to be a promising platform for simultaneous cancer therapy and bioimaging.
研究领域:
生物医学
·
材料科学
·
药学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 19
·2703
·
IF 5.3
Muhammad Amin Padhiar,Shaolin Zhang,Minqiang Wang,Noor Zamin Khan,Shoaib Iqbal,Yongqiang Ji,Nisar Muhammad,Sayed Ali Khan,Shusheng Pan
Perovskite nanocrystals (PeNCs) have emerged as a promising class of luminescent materials offering size and composition-tunable luminescence with high efficiency and color purity in the visible range. PeNCs doped with Yb3+ions, known for their near-infrared (NIR) emission properties, have gained significant attention due to their potential applications. However, these materials still face challenges with weak NIR electroluminescence (EL) emission and low external quantum efficiency (EQE), primarily due to undesired resonance energy transfer (RET) occurring between the host and Yb3+ions, which adversely affects their emission efficiency and device performance. Herein, we report the synergistic enhancement of NIR emission in a CsPbCl3host through co-doping with Yb3+/Nd3+ions for perovskite LEDs (PeLEDs). The co-doping of Yb3+/Nd3+ions in a CsPbCl3host resulted in enhanced NIR emission above 1000 nm, which is highly desirable for NIR optoelectronic applications. This cooperative energy transfer between Yb3+and Nd3+can enhance the overall efficiency of energy conversion. Furthermore, the PeLEDs incorporating the co-doped CsPbCl3/Yb3+/Nd3+PeNCs as an emitting layer exhibited significantly enhanced NIR EL compared to the single doped PeLEDs. The optimized co-doped PeLEDs showed improved device performance, including increased EQE of 6.2% at 1035 nm wavelength and low turn-on voltage. Our findings highlight the potential of co-doping with Yb3+and Nd3+ions as a strategy for achieving synergistic enhancement of NIR emission in CsPbCl3perovskite materials, which could pave the way for the development of highly efficient perovskite LEDs for NIR optoelectronic applications.Keywords:perovskite nanocrystals;NIR Emission;co-doping;LEDs;external quantum efficiency
研究领域:
材料科学
·
光学工程
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Guotao Xiang,Qinyu Xu,Ming Xiong,Zhiyu Yang,Yongjie Wang,Lu Yao,Xianju Zhou,Li Li,Xiaojun Wang,Jiahua Zhang
Photothermal therapy (PTT) integrated with the functionality of temperature self-monitoring has emerged as a prominent research focus in current scientific investigations. In this study, a bifunctional photothermal agent is developed based on the small-size β-NaLuF 4 nanoparticles (NPs) of about 40 nm, which can provide accurate optical thermometry through Nd 3+ -sensitized upconversion (UC) luminescence along with the ability of Cu 2 S-mediated photothermal conversion. The small-size β-NaLuF 4 NPs are synthesized by a sequential layer-by-layer coating strategy, resulting in the generation of β-NaYF 4 @β-NaLuF 4 : 20 % Yb 3+ /2 % Er 3+ @β-NaLuF 4 : 20 % Yb 3+ /2 % Nd 3+ NPs. Then, the temperature sensing performance is realized via the thermally coupled levels of Er 3+ : 2 H 11/2 / 4 S 3/2 under the excitation of 808 nm wavelength. Whereafter, the above NPs suffer from a surface functionalization process with Cu 2 S NPs, endowing the sample with efficient photothermal conversion property, which exhibits an obvious temperature increase from 293 K to 311 K under 808 nm near-infrared (NIR) light irradiation with a power density of 20 mW/mm 2 for 180 s. Meanwhile, an ex vivo experiment further demonstrates that the present NPs can implement efficient photothermal conversion and accurate optical temperature monitoring simultaneously within the biological tissues, while effectively preventing laser-induced overheating effect due to the weak absorption of water molecules for 808 nm NIR light. These findings highlight the promising potential of the prepared NPs for application in cancer treatment, offering a precise and safe approach to PTT with integrated temperature monitoring.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光学
·
诊疗一体化
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 5
·2389-2402
·
IF 1.5
Mao Xueli,Xu Hechao,Liao Xin,Bu Fankang,Tang Jinrong,Yi Facheng
This study achieves the successful immobilization of simulated alpha- and beta-emitting radionuclides (Nd 3+ and Sr 2+ , respectively) by incorporating them into a glass matrix through Nd 2 O 3 /SrSO 4 (Nd/Sr). Varying mixture concentrations (5–30 wt% with mass ratios Nd:Sr varied from 10:1 to 1:10) in simulated radioactive soils were subjected to microwave sintering at 1500 °C for 0.5 h. Comprehensive assessments, including X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), and energy dispersive X-ray spectrometry (EDS), confirm the vitrification process’s efficacy. The vitrified sample exhibits an amorphous structure, smooth surface, and homogeneously distributed elements, highlighting microwave sintering as a promising method for the effective disposal of radioactive-contaminated soil. Graphical abstract
研究领域:
环境科学
·
核废物处理
·
材料科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yuhong Zhang,Hongqun Zhu,Xuezhong Yang,Haoran Wang,Qiang Wang,Chunhui Sun,Haozhou Tian,Hang Liu
Here, the Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ phosphors are prepared through solid-state route. The upconversion (UC)/downshifting (DS) luminescence and temperature performances of all samples are investigated in detail. Under 808 nm excitation, the infrared emission band (∼2000 nm) of Ho 3+ ions is obtained. Especially, the energy transfer process of Nd 3+ → Yb 3+ → Ho 3+ has increased the emission intensity of ∼2000 nm. Moreover, the infrared emission band presents thermal enhancement. Under 980 nm excitation, the UC emission band 500–960 nm is investigated. The green and red light of Ho 3+ ion, near infrared light of Nd 3+ ions are achieved. In addition, the possible luminescence mechanism of Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ phosphor is discussed. At last, the optical temperature sensing characteristics of the phosphor are studied according to the luminescence intensity ratio (LIR) technology. The maximum relative sensitivity of Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ reaches 5.476 % K −1 at 293 K. These results prove that the Sr 2 LaNbO 6 : Yb 3+ /Nd 3+ /Ho 3+ phosphor presents the luminescence in infrared and visible range. The Sr 2 LaNbO 6 :Yb 3+ /Nd 3+ /Ho 3+ phosphor also can be applied to design optical temperature sensor.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·Vol. 13
·期 1
·2401957
·
IF 8
Xin Xie,Wanyin Ge,Qian Zhang,Ye Tian,Zili Luo,Shifan Shang,Jianke Liu,Wenbin Cao
Cr 3+ -doped near-infrared (NIR) phosphors have attracted significant attention in recent years. Despite this, achieving high-performance NIR phosphors with broadband emission and excellent thermal stability remains a considerable challenge. This study presents Lu 3 Ga 5 O 12 :Cr 3+ , which demonstrates a tunable emission peak ranging from 705 to 759 nm and an increased full-width at half-peak maximum (FWHM) from 46 to 139 nm by substituting the [Mg 2+ -Ge 4+ ] chemical unit for the [Ga 3+ -Ga 3+ ] unit. Additionally, in Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , an energy transfer channel (Cr 3+ -Yb 3+ ) is constructed. Under blue light excitation, the characteristic emission peaks of Cr 3+ (600–900 nm) and Yb 3+ (900–1100 nm) are observed simultaneously. However, the emission band between 850 and 900 nm is relatively weak, resulting in a discontinuous emission spectrum. To address this, Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , Nd 3+ phosphors are proposed, which exhibit a continuous broadband NIR emission with a FWHM of 253 nm and internal quantum efficiency of 47.3%. The luminescence intensity retains 81% of its room temperature value even at 423 K. Combining this new phosphor with a blue LED chip results in a portable NIR light source with potential applications in non-destructive detection, information encryption, bio-imaging, and NIR remote control. This work offers a novel perspective for developing high-performance NIR phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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