ACS Applied Electronic Materials
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2021
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IF 3.314
Junqing Xiahou,Qi Zhu,Lin Zhu,Siyuan Li,Ji-Guang Li
Modern engineering fields put forward requirements for optical temperature sensors, which need natural-light excitation/storage and near-infrared (NIR) afterglow emission for some special conditions. Here, NIR persistent luminescent phosphors of ZnGa2–x(Mg/Ge)xO4:Cr3+ (x = 0–1.25) have been synthesized. The incorporation of Mg2+/Ge4+ ions in ZnGa2O4:Cr3+ resulted in more defect clusters of “MgGa′–GeGa•” and “ZnGa′–GeGa•” and interstitial oxygens (OInt). Increasing the calcination temperature and Mg2+/Ge4+ doping both contributed to the generation of OInt. Higher efficiency of visible light excitation was observed, mainly due to the defect clusters and OInt. The samples exhibited a bright NIR emission at 695 nm by exposure to UV or visible light, and the NIR signal can last longer than 1 h after the stoppage of excitation. Incorporation of Mg2+/Ge4+ and increasing the calcination temperature both resulted in a deeper trap depth. However, the density of trapped charge carriers takes the dominant role in the persistent luminescence. Therefore, the x = 0.25 sample, having the most trapped charge carriers, exhibits the best afterglow performance. The prepared phosphor exhibited a temperature-dependent persistent luminescence behavior, which can charge natural light and release NIR light repeatedly many times, indicating that they are the potential natural-light rechargeable materials for temperature sensing.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 15
·3301-3308
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IF 3.286
Ren Shu Huan,Liu Shi Gang,Ling Yu,Shi Yan,Li Nian Bing,Luo Hong Qun
We present a facile method for the preparation of red-emitting and water-soluble silver nanoclusters (Ag NCs) using dihydrolipoic acid and sodium borohydride as the template and reducing agent. Ethanol solvent is demonstrated to endow Ag NCs with dramatically enhanced fluorescence; therefore, the Ag NCs are synthesized in ethanol/water solution (e/w-Ag NCs) instead of aqueous solution. Specific trivalent chromium (Cr 3+ ) recognition capability of the e/w-Ag NCs can thus be obtained on the basis of its fluorescence quenching. The mechanisms for fluorescence enhancement and quenching of the e/w-Ag NCs triggered by ethanol and Cr 3+ , respectively, are investigated in detail. Next, a fluorescence method for detection of Cr 3+ is established and its analytical performance is evaluated: the detection limit for Cr 3+ is 0.71 μM and the linear range is from 2 to 40 μM. The fluorescent probe exhibits sufficient sensitivity and good selectivity toward Cr 3+ , illustrating that it has great promise for practical application in Cr 3+ detection.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Siquan Xu,Donghui Pan,Yuanfeng Wu,Jingdeng Fan,Ningxin Wu,Lijing Gao,Wenqi Li,Guomin Xiao
The mesoporous SBA-15 has long been used as an adsorbent for the removal of toxic metal ions. Achieving secondary utilize of spent adsorbent is undoubtedly an advisible option for environmental protection and recycling economy. In the present study, phosphoric acid-modified SBA-15 (P-SBA-15) was found to be an available adsorbent, and the composites (Cr3+/P-SBA-15) formed after adsorption of Cr3+ ions have the ability to efficiently catalyze the conversion of xylose and xylan into furfural. The physicochemical properties of the Cr3+/P-SBA-15 composites were characterized, and the effects of various reaction parameters on their catalytic performance were also investigated. Among the Cr3+/P-SBA-15 composites with different Cr3+ contents, the (0.25)Cr3+/P-SBA-15 composite not only achieved excellent 91% and 58% furfural yields from xylose and xylan, but also had almost constant catalytic performance after five cycles. The findings herein provided a reference for achieving high yields of furfural and reuse of spent adsorbents.
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JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Zayakhuu Gerelkhuu,Bui The Huy,Jong Won Chung,The-Long Phan,Eric Conte,Yong-Ill Lee
Upconversion phosphors can convert near-infrared light into visible emission by sequentially absorbing multiple photons. In most studies, Yb 3+ /Er 3+ , Yb 3+ /Tm 3+ ions are used as sensitizer/activator in host materials. In this work, we introduce chromium (Cr 3+ ) ions to NaLu 0.86-x Gd 0.12 F 4 :Cr x 3+ Er 0.02 3+ (UCCr) material that is instead of ytterbium (Yb 3+ ) ions. The UCCr material with a different concentration of Cr 3+ ions (0≤x≤0.24) was synthesized by a facile hydrothermal synthesis method. The characterization of the developed UCCr material was performed by photoluminescence (PL), Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and Electron paramagnetic resonance (EPR). The effect of Cr 3+ ions on the upconversion luminescence and magnetic-resonant properties of UCCr material was investigated in detail. The upconversion mechanism was proposed.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Xin Liu,Guangming Niu,Jutao Jiang,Li Che,Laizhi Sui,Xiaowei Wang,Xiangyu Zeng,Guorong Wu,Kaijun Yuan,Xueming Yang
Lead-free halide double perovskites (DPs) have attracted much attention due to their potential applications in the field of near-infrared (NIR) optoelectronics. However, regulating the NIR luminescence properties of such materials remains a challenge. In this study, it is found that Cs 2 AgInCl 6 :Cr 3+ DPs exhibit a broad NIR emission under ultraviolet excitation, with a peak value of 980 nm. In the range of 9 GPa, the emission intensity increases significantly. As the pressure increases, a transition from broadband NIR emission to narrow-line emission occurs, accompanied by a decrease in the full width at half maximum (FWHM) from 260 to 40 nm, attributed to increased local structural asymmetry and enhanced crystal field around Cr 3+ ions. Ultrafast transient absorption experiments reveal the changes of energy transfer under pressure and the emergence of new radiation channels, demonstrating the dynamic evolution of emission characteristics under high pressure. The research results deepen the understanding of high pressure luminescence in Cr 3 ⁺-doped halide DPs, providing strategies for designing highly efficient NIR emitters in metal halide DPs.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Enbei Yang,Han Ma,Qiang Zhou,Mengyan Yang,Yurong Guo,Jing Wan,Huaijun Tang,Zhengliang Wang
The luminescence enhancement of near-infrared (NIR) emissive material is critical in emerging applications. In this work, we have prepared an NIR-emitting K 2 NaSc 1- x - y Al x F 6 : y Cr 3+ (denoted as KNS 1- x - y A x F: y Cr) solid solution phosphor via the introduction of Al 3+ , enhancing luminescence in a high-temperature solid-state reaction. The resultant solid solution phosphor exhibited a broad NIR emission band with a high internal quantum efficiency (IQE = 81.1 %) and an enhanced photoluminescence thermal stability (93 % at 423 K) under 432 nm excitation. When compared with the Al-free sample, the IQE and thermal stability are increased by 45.9 % and 22.4 %, respectively. The optimal Cr 3+ and Al 3+ doping content has been determined and a composition-optimized KNS 0.70 A 0.25 F 6 :0.05Cr phosphor is demonstrated by fabricating an NIR pc-LED device as a light source for light-emitting diode applications.
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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 10
·1508-1518
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IF 4.776
Hanghang Liu,Feng Ren,Hao Zhang,Yaobao Han,Huizhu Qin,Jianfeng Zeng,Yong Wang,Qiao Sun,Zhen Li,Mingyuan Gao
Near-infrared (NIR) long lasting persistent luminescence nanoparticles (PLNPs) have attracted considerable attention in the area of in vivo bioimaging, due to their background-free luminescence characteristics and deep tissue penetration. However, the low fluorescence quantum yield and short afterglow of the currently available PLNPs limit their applications. Here, water-soluble Cr3+-doped ZnGa2O4 PLNPs with the highest quantum yield (η = 20%) ever reported, bright NIR emission, and excellent colloidal stability were successfully prepared by a one-step hydrothermal method. The afterglow of the resultant nanocrystals lasted for more than 5 days and could be repeatedly reactivated by the light (λ = 657 nm) of a portable light emitting diode lamp after decay. These nanocrystals were functionalized with α,ω-dicarboxyl-terminated poly(ethylene glycol) and poly(acrylic acid) to improve their stability and biocompatibility, so that they could be conjugated with a c(RGDyK) peptide and labeled with 99mTc for targeted imaging of orthotopic breast cancer by afterglow luminescence imaging and single-photon emission computed tomography imaging. Our NIR-PLNP probes can effectively avoid tissue auto-fluorescence and the light scattering caused by continuous excitation during the diagnosis of cancer.
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Advanced Optical Materials
·
2024
·
IF 8
Min Zhang,Peipei Dang,Yujia Wan,Yingsheng Wang,Zixun Zeng,Dongjie Liu,Qianqian Zhang,Guogang Li,Jun Lin
Visible-to-near-infrared (VIS-NIR) luminescent materials are in great demand in the field of non-destructive testing such as component determination and hyperspectral imaging. Although Cr 3+ -activated phosphors are widely reported, controllable tailoring ultra-wide VIS-NIR luminescence excited by blue light is still a challenge. The strategies of cationic substitution and energy transfers are effective for adjusting the luminescence of Cr 3+ -activated phosphors. In this work, a series of Cr 3+ -doped Sc-based solid solution phosphors (Ba 3-m Sr m Sc 4 O 9 :Cr 3+ ) are reported. Under the excitation of blue light, these phosphors exhibit broadband emission due to the different luminescence centers induced by Cr 3+ occupying different cationic sites. Because of the weaker crystal field strength, Cr 3+ realizes a broadband emission with a longer peak position (λ em = 820 nm) and broader full width at half maximum (FWHM≈182 nm) in Ba 2 SrSc 4 O 9 . Furthermore, Ce 3+ /Yb 3+ ions are introduced into Ba 2 SrSc 4 O 9 :Cr 3+ , achieving an ultra-wide VIS-NIR luminescence (460–1200 nm) by the Ce 3+ →Cr 3+ →Yb 3+ multiple energy transfers. Designing energy transfers is beneficial to improve the quantum efficiency and weaken the thermal quenching. Finally, the NIR phosphor-converted light-emitting diode (pc-LED) fabricated by Ba 2 SrSc 4 O 9 :Cr 3+ demonstrates great potential in night-vision and water component detection. This work provides an effective design idea for controllable tailoring ultra-wide VIS-NIR luminescence by chemical substitution and energy transfer.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Jing Yang,Yun Yuan,Ruxin Zhang,Chao Liu,Deyi Zhu,Dandan Ji
Industrial wastewater, a byproduct of rapid industrialization, often contains hazardous heavy metal ions such as Cu 2+ , Cr 3+ , posing significant risks to environmental and human health. To address the urgent need for fast and simple detection methods in industrial enterprises, we developed gelatin-poly-ε-caprolactone (GEL-PCL) nanofiber fluorescent sensors, incorporating 1,4-dihydroxyanthraquinone (1,4-DHAQ), for the rapid detection of Cu 2+ , Cr 3+ ions. Electrospinning was used to prepare 1,4-DHAQ@GEL-PCL and 1,4-DHAQ/Cu 2+ @GEL-PCL sensors, leveraging the fluorescence intensity fluctuation behavior between 1,4-DHAQ and the target ions to enable fluorescence-based detection. The sensors were characterized using SEM to confirm nanofiber morphology, and UV–Vis spectroscopy to analyze absorption properties. The sensors demonstrated high sensitivity and selectivity for Cu 2+ , Cr 3+ ions, with detection ranges of 4.8–6.5 × 10 −6 M and 2.7–4.3 × 10 −6 M, respectively. Furthermore, they maintained stable performance over 6 months of storage and showed reliable results in actual tannery wastewater samples, comparable to ICP-MS data. This study highlights the potential of these sensors as environmentally friendly, cost-effective tools for monitoring heavy metal ion concentrations, offering significant contributions to sustainable industrial wastewater management, and meeting the pressing needs of enterprises for efficient and straightforward monitoring solutions.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Sihan Yang,Xinyu Li,Qian Zhang,Meiting Li,Xuejiao Wang,Nan Wu
Studies have shown that emissions in the NIR-II and NIR-III regions exhibit high tissue penetration, along with superior performance in biological and medical imaging applications. Therefore, developing NIR phosphors capable of simultaneously show emissions in both the NIR-II and NIR-III regions holds significant value. Herein, we developed a novel Cr 3+ /Er 3+ co-doped NaBaScSi 2 O 7 phosphor that demonstrates efficient dual-band emission in both NIR-II and NIR-III regions under visible light excitation, enabled by highly effective Cr 3+ →Er 3+ energy transfer. The energy transfer efficiencies calculated by the emission intensity and fluorescence lifetime are 65.3% and 47.4%, respectively, with the energy transfer mechanism dominated by dipole-dipole interaction. The prepared phosphor can be effectively excited by multiple excitation sources (378 nm, 492 nm, 808 nm, and 980 nm), generating distinct emission responses, highlighting its potential for anti-counterfeiting applications. Additionally, the distinct temperature-dependent optical properties of Cr 3+ and Er 3+ offer a viable approach for non-contact temperature detection, achieving a relative sensitivity of 0.8% K -1 and a temperature resolution of 0.126 K at 498 K. The NIR-II/III pc-LED fabricated by NaBaScSi 2 O 7 : 1%Cr 3+ , 0.2%Er 3+ demonstrates outstanding non-invasive imaging capability and accurate predictions for organic solvents. This study presents a strategy for developing phosphors capable of simultaneous NIR-II/III emission, and significantly advances their multifunctional applications in NIR optical thermometry and NIR pc-LED technologies.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Jianhua Liu,Jiarui Duan,Deyin Wang,Yuhua Wang
Phytochrome Pr and Pfr are essential for plant growth and photosynthesis, primarily absorbing deep red light at 660 nm and near-infrared (NIR) light at 730 nm. This paper is dedicated to enhance the efficiency of deep red to NIR light emission in BaLu 2– x SiAl 4– y O 12 (BLSA): x Ce 3+ , y Cr 3+ through an energy transfer strategy designed to promote plant growth and improve night vision. It is found that sample doped solely with Cr 3+ can emit deep red to NIR emission in BLSA; however, the spin-forbidden nature of the Cr 3+ 3d→3d transition leads to low luminescence efficiency. On the contrary, in Ce 3+ -doped BLSA, Ce 3+ ions efficiently absorb blue light and emit intense green light, which overlaps the wavelength range of Cr 3+ absorption spectrum. This spectral overlap promotes the energy transfer from Ce 3+ to Cr 3+ , thereby enhancing the deep red to NIR emission of Cr 3+ . This enhancement is evidenced by the external quantum efficiency of Cr 3+ emission, which is 12.5% in the sample doped solely with Cr 3+ and is increased to 48.6% when co-doped with Ce 3+ ions. The energy transfer mechanism between Ce 3+ and Cr 3+ is found to primarily involve dipole-dipole interactions, as described by Dexter's formula and multipole interaction modeling. In addition, by using BLSA:0.1Ce 3+ ,0.03Cr 3+ phosphor to fabricate NIR lighting devices, it is found that the emission spectra are highly matched with the absorption spectra of the phytochromes Pr and Pfr, demonstrating its great potential for application in indoor plant growth lighting. Moreover, the lighting source system is adaptable for various scenarios such as night vision and non-invasive bio-imaging, showcasing its promising versatility for application.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Xiao Dan Sun,Dawei Feng,Jia Xu,Xue Gao,Kai Yan,Zhenhua Tian
Zwitterionic poly(ionic liquids) (ZPILs) were used as a combination tanning agent to enhance the absorption of chromium tanning agent and dyes simultaneously, which is crucial and challenging during the tanning process. Mesoporous silica (MCM-48) with a size of ∼70 nm was introduced as a nanotainer to adsorb photoinitiator and a small quantity of methylacrylic acid (MAA), and then ILs monomer and MAA were added and they started to polymerize in the pores of MCM-48, which could avoid the gelation of ZPILs in aqueous solution. In this way, the obtained nanocomposites (M48/PMIL) had a smaller size (200–500 nm) and good fluidity, so they were suitable to use as tanning agent. The addition of M48/PMIL made the shrinkage temperature and thickness rate of leather increase by 5.5 °C and 22 % than Cr-tanned leather, respectively. Meanwhile, mechanical properties are also improved further. Moreover, the Cr 2 O 3 content in tanning liquor decreased by 28.8 %, and the anionic dye absorption rate enhanced by 7.9 %, respectively, due to the good permeability and the presence of zwitterion in M48/PMIL. This novel tanning agent exhibits a potential application in less chromium tanning and decreases the Cr 3+ and dye content in tanning liquor.
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