LANGMUIR
·
2024
·
IF 3.7
Yueji Li,Yuteng Zhang,Xue Liu,Bin Dong,Pan Xu,Bo Song
Heparin is widely used to treat thrombosis because it is an effective anticoagulant. However, excessive use of heparin can lead to an increased risk of bleeding, which makes the quantitative detection of heparin very important. An amphiphilic perylene bisimide molecule (denoted PBI-9) was developed, which presented a near-infrared emission peak at 730 nm when it was aggregated. PBI-9 has been utilized in the detection of heparin, as the pyridine cation in PBI-9 binds strongly to highly sulfated heparin through electrostatic interactions. Charge neutralization triggers the self-assembly of PBI-9, which leads to an emission peak shift from 540 nm to 690 nm, corresponding to monomeric emission to excimer emission. This shift was applied for the detection of heparin. Importantly, the interaction between PBI-9 and heparin is not affected by protamine, resulting in high selectivity and minimal interference. PBI-9 is a promising tool for detecting heparin in clinical settings after excess heparin has been neutralized by protamine.
研究领域:
生物化学
·
医学诊断
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Dilare Halmurat,Xinyu Zhang,Litipu Aihaiti,Rong-Jun Xie
Eu 2+ -doped phosphors show broadband absorption, tunable emission and high quantum efficiency due to the parity-allowed 5d→4f transitions, allowing them to be used in solid-state lighting. To expand their applications in other fields such as detection and sensing technologies, the Eu 2+ emission needs to be tuned into the near-infrared region, but it is a big challenge to obtain Eu 2+ near-infrared region emitters due to the absence of host compounds with extremely large crystal-field splitting. In this work, we chose M 4 Li(BN 2 ) 3 (M = Ca, Sr, Ba) as a host and realize the near-infrared region emission of Eu 2+ in it. Among these phosphors, Ba 4 Li(BN 2 ) 3 :Eu 2+ exhibits the longest emission of 880 nm and the largest full-width at half maximum of 276 nm under 450 nm excitation, while Ca 4 Li(BN 2 ) 3 :Eu 2+ and Sr 4 Li(BN 2 ) 3 :Eu 2+ emit at 740 and 680 nm, respectively. We observe an interesting phenomenon that the energy shift of emission is linearly related to the radius difference between the alkaline earth cation and the activator Eu 2+ in this system.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2019
·Vol. 6
·期 2
·285-291
·
IF 3.431
Denghao Li,Chaojun Li,Xiaofeng Liu,Qianling Cui,Shiqing Xu,Jianrong Qiu
Graphical A stronger NIR emission and a broadband excitation can be achieved when the nanoparticle NaYF 4 : Nd 3+ are coated by OFBT which is ascribe to the energy transformation between NPs and OFBT. The energy transfer efficiency can be modulated by the dynamic interactions of OFBT with the NP surfaces. In addition, the hybrid nanoparticles can be used as pH and temperature probes due to their duel-responsive properties. Lanthanide (Ln) activated systems are characterized by the rich line-shaped emission spectra stemming from the parity-forbidden inner shell f-f transitions. This inherent nature of Ln ions efficiently stabilizes their emissions against environment perturbations, but always necessitates the use of strong and broadband sensitizer to achieve efficient emission. Here, based on a model near-infrared (NIR) emitting system – NaYF 4 : Nd 3+ NPs, we demonstrate sensitized NIR emission by grafting the nanoparticle (NP) surfaces with a visible-light active organic conjugated oligomer, 4,7-(9,9′-bis(4-carboxybutyl)-fluorenyl)-2,1,3-benzothiadiazole (OFBT). Photoluminescence (PL) emission, excitation and time-resolved spectra confirm energy transfer from the OFBT molecules to nanoparticles across the organic/inorganic interfaces, and the efficiency of ET is quantitatively determined by the surface coverage of OFBT molecules and concentration of Ln ions in the NPs. By taking advantage of the environment-sensitive binding strength of OFBT to NP surface, we further demonstrate high sensitivity of the NIR emission from the hybrid NPs to variations in pH and temperature, which is explained by the change in energy transfer efficiency from OFBT to NPs. Therefore, the developed nano-hybrid systems are believed to have potential applications in sensing and detection in physiological environment.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Wei Liao,Kai Han,Yuzhen Wang,Zhiguo Xia
X-ray imaging based on scintillators with visible-light emission primarily reveals structural information, but the integrated detection of complex targets, especially biological systems, remains challenging. Here, a dual-mode collaborative imaging strategy is proposed based on the design of perovskite-type halide scintillators (Cs 2 HfCl 6 :Mo 4+ ), which present efficient near-infrared (NIR) emission above 900 nm upon the excitations of 808 nm laser and X-ray sources. Dual-mode indirect imaging with simple excitation source switching has been performed to visualize bone and blood vessels in biological targets. The light yield and detection limit are estimated to be 44500 Ph MeV −1 and 87.4 nGy s −1 , respectively, and a dual-mode imaging screen with spatial resolution of 14 lp mm −1 for NIR imaging and 12 lp mm −1 for X-ray imaging is successfully obtained. This work may stimulate research into the NIR scintillators for the development of multi-mode imaging with mitigating light crosstalk.
研究领域:
材料科学
·
医学影像
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Renping Cao,Zhiyuan Li,Jingheng Nie,Xiaochun Li,Lei Zhang,Ruirui Yang,Hui Ao,Jingjing Duan,Chenxing Liao
Near-infrared (NIR) luminescent materials based on Fe 3+ are growing interest in recent years because of the low-toxicity, high-efficiency, and adjustable emission. In this work, a broadband NIR emitting β-Mg 3 Ga 2 GeO 8 : Fe 3+ with [Ga/GeO 4 ] tetrahedron for the replacement of Fe 3+ ion is synthesized in air. X-ray diffraction patterns are used to confirm the crystal structure and phase purity. The excitation spectrum is observed in the region from 210 to 550 nm due to the O 2− - Fe 3+ charge transfer and the d – d electron transitions in 3 d 5 orbit of Fe 3+ . A broadband NIR emission of β-Mg 3 Ga 2 GeO 8 : Fe 3+ with full width at half maximum (∼108 nm) in the region from 610 to 880 nm is assigned to the transition 4 T 1 ( 4 G) → 6 A 1 ( 6 S) of Fe 3+ ion. Photoluminescence (PL) spectra under different excitation wavelengths, concentration dependent PL spectra, time-resolved PL spectra, temperature dependent PL spectra, and lifetimes of β-Mg 3 Ga 2 GeO 8 : Fe 3+ are investigated. We confirm the luminous center (Fe 3+ ), the optimal Fe 3+ concentration (0.8 mol%), and the good thermal stability of β-Mg 3 Ga 2 GeO 8 : Fe 3+ . The luminescence mechanism is analyzed theoretically by the Tanabe-Sugano and energy level diagrams of Fe 3+ in β-Mg 3 Ga 2 GeO 8 : Fe 3+ , and the concentration and thermal quenching mechanisms are explained. The research results will be conducive to the development of new Fe 3+ -doped luminescence materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4442-4449
·
IF 1.556
Ma Qian,Yue Hanxiao,Zhu Yuanna,Wang Junpeng,Che Quande,Shi Ruixia,Yang Ping
A series of red to near-infrared (NIR) emitting quantum dots (QDs) with spherical morphologies and tunable photoluminescence (PL) properties have been synthesized by a facile organic route using octadecene (ODE) as solvent and oleic acid (OA) as single capping agent. CdSe cores with
the average size of 4.5 nm display the typical optical behaviors with the PL emission peak around 610 nm. The coating CdZnS shells are introduced on the surface of CdSe cores for improving the photostability and PL efficiency of the initial QDs. As the thickness of CdZnS shells increasing,
the gradual red-shift of emission wavelength varying from 617 to 634 nm of the resulting QDs can be observed, along with the remarkable increase of PL quantum yield (QY). The composition-dependent CdTe
x
Se1-x
(CdTeSe) cores with the emission in NIR region
are easily carried out by adjusting the molar ratio of Se/Te. The abnormal variation of optical bowling effect is mainly ascribed to the composition effect of alloyed QDs. Compared with CdTe0.1Se0.9/CdZnS core/shell QDs, the introducing of CdZnS shells on CdTe0.05Se0.95
cores can exhibit better passivation effect on surface status, consequently leading to the red-shifted emission peaks in the range of 739–752 nm with the maximum PL QY reaching up to 45.09%. The unique PL properties of CdTeSe-based QDs in the red to NIR range make these core/shell QDs
attractive for future biological sensing and labeling applications.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 1
·488-494
·
IF 1.483
Ma Qian,Yang Fanghong,Zhu Yuanna,Wang Junpeng,Che Quande,Shi Ruixia,Yang Ping
Red to near-infrared (NIR)-emitting ternary-alloyed CdTe
x
Se1−x
(x = 0–0.3) quantum dots (QDs) with tetrapod and dot morphologies have been synthesized by a facile method using oleic acid (OA) as single capping agent. The controlled
dot-shaped and tetrapod-shaped CdTe
x
Se1−x
QDs can be successfully obtained by adjusting the content of Te element. It is clear that CdTe
x
Se1−x
QDs display the tunable emission peaks from the visible light
(613.4 nm) to the NIR range (791.6 nm). With an inorganic CdZnS shell coated on the surface of CdTe0.1Se0.9 cores, the stability and PL efficiency of the resulting core/shell QDs can be improved dramatically, accompanied with the red-shift of emission peaks to longer
wavelength (795.6 nm). Peculiarly, a large blue shift of emission spectrum of CdTe0.3Se0.7/CdZnS core/shell QDs is observed, which is mainly ascribed to the shrink of the size of QDs by the fracture of tetrapod arms.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Wei Zhao,Li Li,Faling Ling,Yongjie Wang,Guotao Xiang,Xianju Zhou,Sha Jiang,Zhiyu Yang,Yongbin Hua,Jae Su Yu
Lead-free double perovskite materials have attracted lots of interest because they can be doped with luminescence activators to modify their optical characteristics and improve photoluminescence performances. Herein, a solvothermal method was utilized to synthesize single Cr3+-doped Cs2NaInCl6 phosphors. Under 292 nm excitation, Cr3+-doped Cs2NaInCl6 microparticles exhibited a strong broad near-infrared emission with a good photoluminescence quantum yield of 42.9%. The prepared sample exhibited a prominent peak at 960 nm and a full width at half maximum of 138 nm, which can be attributed to the spin-allowed transition (4T2 → 4A2) of Cr3+ ions. Additionally, the emission band of Cr3+ displayed a noticeable red shift as temperature increased owing to the variations in the strength of the crystal field. The thermometry based on the bandwidth and band-shift modes showed good sensitivities of 0.337 nm K−1 and 0.272 nm K−1, respectively. Finally, the security ink was made for information encryption.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junshan Hu,Daobin Zhu,Keyu Guo,Bin Duan,Yuxiang Wu,Yongqiang Li,Fengyi Wang,Wei Jin,Changchun Ding
The KYb(MoO 4 ) 2 : Er 3+ , Y 3+ phosphors were synthesized by high temperature solid state reaction method. By further doping Y 3+ ions, the near-infrared (NIR, 804 nm, 4 I 9/2 → 4 I 15/2 ) luminescence of KYb(MoO 4 ) 2 : 0.1 % Er 3+ phosphor is greatly enhanced. Based on the upconversion luminescence (UCL) spectra, the optimal doping concentration of Y 3+ ions were 7.5 %. Its near-infrared UCL intensity is about 26.9 times that of undoped Y 3+ ions. Through a series of characterization methods, we find that the enhancement of NIR upconversion emission is due to the generation of defect bands. It plays a crucial role in facilitating the transfer of energy from green light level ( 2 H 11/2 , 4 S 3/2 ) to red light level ( 4 F 9/2 ) and near-infrared level. To explain the luminescence mechanism, the power dependence, UV-VI-NIR absorption spectra , excitation spectra at 804 nm and emission spectra at 380 nm were studied. In addition, the 804 nm single near-infrared UCL intensity of KYb (MoO 4 ) 2 : Er 3+ , Y 3+ shows a linear variation with temperature in the temperature range of 298 K–673 K. The maximum sensitivity is 0.13 % K −1 . This study provides a new method and theoretical support for the application of near-infrared UCL in optical temperature measurement.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 40
·5730-5739
·
IF 3.1
Ying Chen,Xuegang Zheng,Meijuan Liu,Haobo Lin,Shusheng Pan,Weiwei Xing,Zhiyu Liu,Dekang Xu,Hao Lin
In previous studies, LiErF4 mostly served as a dipolar-coupled antiferromagnet and was less commonly used as a luminescent material to study the luminescence performance. Therefore, there are few research reports on the luminescent properties of LiErF4 materials at this stage. In this work, the LiErF4:Ce,Yb,Y@LiYbF4:Tm@LiYF4 core/shell/shell upconversion nanoparticles (UCNPs) and the relevant derivative samples were successfully prepared by coprecipitation method. The LiErF4:Ce,Yb,Y@LiYbF4:Tm@LiYF4 UCNPs exhibit a prominent emission peak at 792 nm and several weak emission peaks in the visible light region under irradiation at 980 nm. Here, the cross relaxation between Ce3+ and Er3+ in the core can effectively reduce unwanted visible light emissions (4S3/2 + 2F5/2 → 4F9/2 + 2F7/2, 4F9/2 + 2F5/2 → 4I9/2 + 2F7/2, 4I9/2 + 2F5/2 → 4I11/2 + 2F7/2, 4I11/2 + 2F5/2 → 4I13/2 + 2F7/2). The Yb3+ ions not only work as an energy transfer medium promoting energy transfer, but also as an energy harvester effectively absorbing excitation energy, which can improve energy utilization and promote first near-infrared (NIR-I) emission. The intensity of NIR-I and the ratio of NIR-I to visible light are increased due to the cross relaxation between Ce3+ and Er3+ and the energy migration among Yb3+. The UCNPs emitting strong NIR-I light are advisable for biological imaging.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2017
·Vol. 122
·期 17
·
IF 2.068
Tong Liping,Saito Katsuhiko,Guo Qixin,Zhou Han,Fan Tongxiang,Zhang Di
Visible-light-activated near-infrared luminescent materials are promising photoluminescent materials due to their convenience and low cost. Crystal defects can seriously affect the performance of luminescent materials, and better understanding of the complexity of the structural disorder and electronic structures of such materials opens up new possibilities in luminescent material development. In this work, we successfully design a novel, effective, visible-light-activated near-infrared luminescent Gd 3 Ga 5 O 12 : 4.2%Yb 3+ , 8.4%Er 3+ , and 4.2%Bi 3+ system based on first principles. This exhibits strong emission intensity and high luminous efficiency (0.993) and also has a lifetime (7.002 ms) that is at least twice as long as the longest lifetime reported in published papers. We utilize density functional theory with an effective LSDA + U method to study the structural properties of Gd 3− x − y − z Ga 5 O 12 : x Yb 3+ , y Bi 3+ , z Er 3+ (GGG: Yb 3+ , Bi 3+ , Er 3+ ). The d and f electron orbits of rare-earth ions are considered for an effective Hund exchange. Detailed analysis reveals that GGG: 4.2%Yb 3+ , 8.4%Er 3+ , 4.2%Bi 3+ has the smallest cell volume because of the strong covalent bonds of Bi–O, Er–O, and Yb–O. Bi 3d is a hybridized state that acts as sensitizing ions during the process of luminescence in GGG: Yb 3+ , Bi 3+ , Er 3+ . Together with experimental and theoretical results, we analyze the influence of defects on emission intensity. The locations of Yb 3+ , Er 3+ , and Bi 3+ are determined by X-ray absorption fine structure measurements, which are in agreement with the model constructed using first principles. This work may provide innovative guidance for the design of high-performance visible-light-activated near-infrared luminophores based on calculations and a new methodology for application of coherent laser radar and optical communication.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yuanyuan Li,Puxian Xiong,Gaochao Liu,Mingying Peng,Zhijun Ma
Bismuth (Bi)-activated luminescence materials have attracted much attention for their tunable broad emissions ranging from a visible to near-infrared (NIR) region. However, it remains a challenge to regulate the Bi valence state and achieve NIR emission via a facile way. Here, we report the design and preparation of Ba3Sc4O9:Bi phosphors, which emit visible and NIR emissions simultaneously even prepared in the air condition. The self-reduction mechanism of Bi3+ species in Ba3Sc4O9 with a rigid crystal structure is illustrated based on the charge compensation model, and the coexistence of different Bi-active centers, Bi3+ for visible emission, while Bi+ and Bi0 for NIR emission, is confirmed by the spectroscopic data and X-ray photoelectron spectroscopy (XPS) analysis. The enhanced NIR emission was further achieved through controlled reducing treatment and the related mechanism has also been clarified. This work paves a new way to control bismuth valence and tune the emission of Bi-based luminescence materials for emerging photonics applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
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