OPTICAL MATERIALS
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2020
·
IF 2.779
Yiwei Gao,Bingchu Mei,Weiwei Li,Zhiwei Zhou,Zuodong Liu
Ytterbium-doped strontium fluoride (Yb: SrF 2 ) nanopowders with different amounts of Yb 3+ were synthesized by a co-precipitation method. XRD and FE-SEM measurements were used to characterize the phase composition and morphologies of these nanopowders. The Yb: SrF 2 nanopowders doped with 1–5 at.% Yb 3+ showed the same phase as pure SrF 2 , with a mean particle size of 20 nm. Transparent Yb: SrF 2 ceramics were fabricated by hot-pressing the nanopowders, and the transmittance of 1 at.% Yb: SrF 2 with a thickness of 2 mm was 85% at 1200 nm. The absorption spectra , luminescence spectra, and luminescence decays of the ceramics were also obtained. As the Yb 3+ doping amount increased, the absorption and emission intensities also increased, indicating the absence of a concentration quenching effect in the Yb: SrF 2 ceramics. However, the decay lifetimes decreased with increasing Yb 3+ content, and 1–5% Yb: SrF 2 transparent ceramics had decay lifetimes of 4.58, 3.48, 3.22, and 3.19 ms, respectively.
研究领域:
材料科学
·
光学工程
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Lingyu Song,Yongbao Zhu,Jinfeng Wang,Tingxia Wu,Shuo Zhou,Xianbo Zhang,Junping Tang,Jikui Wang,Donghai Lin,Guosong Chen
The iron ion in industrial circulating cooling water is an important indicator for early warning of equipment corrosion and control level. It is interesting to construct an upconversion luminescence iron ion nanoprobe with a common inorganic phosphate water treatment agent. Herein, inorganic phosphate sodium hexametaphosphate (SHMP) was used to regulate the morphology and functionalization of NaYF 4 :Yb 3+ , Er 3+ upconversion luminescent nanoprobe (UCNPs) and applied to fluorometric detection of trace Fe(III) in water based on the fluorescence quenching which is caused by the selective coordination between hexametaphosphate on the surface of UCNPs and Fe(III). The structure, morphology, and luminous intensity of UCNPs were regulated by disodium hydrogen phosphate (ADSP), sodium tripolyphosphate (STPP) and sodium hexametaphosphate(SHMP). The UCNPs functionalized with SHMP has high sensitivity and selectivity for Fe(III) detection. The linear range and detection limit are 1.0–50 μM and 0.2 μM, respectively. The method has satisfactory results for the detection of trace Fe(III) in industrial circulating cooling water.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Mengjia Zhang,Changchun Ding,Bin Duan,Yuxiang Wu,Yongqiang Li,Jin Wei,Fengyi Wang,Junshan Hu
The upconversion luminescence (UCL) of inorganic materials doped with activators and sensitizers has great application, but its luminescence intensity always impose restrictions on its development. Herein, an obvious enhancement in luminescence intensity of the WO 3 : Yb 3+ , Ho 3+ phosphor was realized through non-equivalence substitution of Bi 3+ ions. The single pure phase of the synthesized WO 3 : Yb 3+ , Ho 3+ , and Bi 3+ phosphors has been confirmed by the XRD pattern. The morphology of phosphors and valence state of elements have been performed by SEM and XPS techniques. The sample on excitation with 980 nm performs forceful green emission and weak red emission at 543 nm and 662 nm, separately. The concentrations for doped Yb 3+ and Ho 3+ to obtain the optimal UCL in WO 3 are 8% and 1%, respectively. The optimized doping concentration for Bi 3+ ions is 3%. Compared to samples without Bi 3+ ions, the Yb 3+ /Ho 3+ /Bi 3+ doped WO 3 obtains 1.59 and 2.33 times increase in emission intensity of green and red, respectively. We also explored the UCL mechanism and enhancement mechanism on the basis of the power dependency, the UCL and the downshift luminescence. These results based on Yb 3+ /Ho 3+ UCL phosphors research is of great significance.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhongxiang Shao,Xianju Zhou,Li Li,Yongjie Wang,Faling Ling,Chuan Jing,Xiao Tang,Zhongmin Cao
The broadband near-infrared (NIR) phosphor converted light emitting diode (NIR pc-LED) has garnered unprecedented attention due to its crucial role in NIR applications. However, there remains a scarcity of efficient broadband NIR luminescence materials capable of emitting NIR light with wavelengths greater than 800 nm. This study reports the synthesis, crystal structure and photoluminescence (PL) properties for double perovskite Sr 2 ScTaO 6 :Cr 3+ phosphors which exhibit a broadband NIR emission in the 650–1250 nm range, peaking at∼815 nm with the full width at half maximum (FWHM) of 161 nm. The observed broadband emission arises from two distinct Cr 3+ centers, namely Sc 3+ and Ta 5+ octahedral sites within the Sr 2 ScTaO 6 structure, as demonstrated by luminescence and decay kinetic analysis. A significant enhancement of the thermal stability and a remarkable broadening of the FWHM (from 161 to 275 nm) are achieved by employing Yb 3+ co-doping strategy. The efficient energy transfer from Cr 3+ to Yb 3+ was confirmed through emission and excitation spectra, as well as luminescence decay measurements. Finally, Sr 2 ScTaO 6 :Cr 3+ -Yb 3+ phosphor was integrated with a 470 nm blue LED chip to fabricate a NIR pc-LED device, and its potential application in night vision was evaluated.
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MATERIALS LETTERS
·
2022
·
IF 3.574
Jinhua Du,Ye Zhao,Yanyu Wang,Jing Ai,Yong Li,Xihong Hao
High energy density is an important factor for antiferroelectric materials applied in power pulse devices. Herein, the Ag (1-3x) Yb x NbO 3 (AYNO-100 x ) ceramics with x = 0, 0.02 and 0.04 were synthesized via a solid-state reaction method in an oxygen atmosphere. The Yb 3+ doping at A-site reduces the oxygen vacancy and increases the silver vacancy after reaching saturation, which improves the antiferroelectric stability, leading to enhanced recoverable energy-storage density of 2.7 J/cm 3 under 255 kV/cm at room temperature. Meanwhile, a relatively high discharge energy density of 1.0 J/cm 3 at 200 kV/cm is also observed in the Ag 0.94 Yb 0.02 NbO 3 ceramic. These results indicate that AgNbO 3 -based ceramics are potential candidates in advanced power electronic devices.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
·
IF 3.995
Xiangyan Yun,Jun Zhou,Yaohui Zhu,Xiong Li,Shan Liu,Chen Fang,Mingxia Lv,Denghui Xu
Up-conversion fluorescent materials serve a significant function as the detection materials of temperature sensors . In this study, a series of green-emitting LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors applied in optical temperature sensing detection were successfully synthesized via the solid-state process in air. The crystal structure, luminescence properties, luminescence mechanism, and optical temperature sensing properties of samples were investigated. LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphor with excitation at 980 nm emits pronounced green emissions owing to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. The whole emission processes of LiLu 0.72 W 2 O 8 :0.24 Yb 3+ , 0.04Er 3+ sample are all two-photon processes. Moreover, we apply thermal coupling levels ( 2 H 11/2 , 4 S 3/2 ) for temperature sensing and the value of sensing sensitivity can reach the maximum of about 1.41% K −1 . All the experimental results imply that LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors show good potential in temperature sensing.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Pengfei Shuai,Libing Liao,Qingfeng Guo,Dan Yang,Ruiqi Shi,Lefu Mei
Cryolite was considered to be an ideal up-conversion host material due to its low phonon energy, which can effectively suppress the radiation-free transition process of excited state energy levels. In the present paper, a novel up-conversion material K 3 YF 6 :Ho 3+ , Yb 3+ with cryolite structure was prepared successfully using a high-temperature solid state method. The up-conversion luminescence properties of K 3 YF 6 doped with different Ho 3+ /Yb 3+ doping ratio were investigated and the optimal doping ratio were confirmed in this system. Under 980 nm excitation, Ho 3+ /Yb 3+ co-doped K 3 YF 6 revealed a strong green emission at the 541 nm, 549 nm and a weak red emission peaking at 666 nm, corresponding to the 5 F 4 , 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions of Ho 3+ , respectively. All the red and green up-conversion emission of K 3 YF 6 :Ho 3+ , Yb 3+ belong to two-photon process and energy transfer from Yb 3+ to Ho 3+ simultaneously. Additionally, to understand the energy transfer and electronic transition process of the red and green light emitted, the possible luminescence mechanism were also analyzed in this paper. All the results indicate that Ho 3+ /Yb 3+ co-doped K 3 YF 6 have potential application value in green up-conversion luminescent materials.
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CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Wenting Fan,Fang Zhao,Jiahong Dou,Xuhong Guo
The efficient and scalable synthesis of lanthanide-doped NPs, which exhibit down- and upconversion luminescent properties simultaneously, is still a main challenge that are hindering their adoption. Herein, we employed a facile method, i.e. reactive flash nanoprecipitation, to fabricate dual-mode luminescent lanthanide phosphate (LnPO 4 ) NPs: lanthanum phosphate (LaPO 4 ) co-doped with Tb 3+ and Yb 3+ . The lanthanide source streams and phosphate ion source streams were efficiently mixed in a multi-inlet vortex mixer reactor, and the use of a stabilizer was found to facilitate the formation of uniformly-dispersed LnPO 4 nanocrystals. It is demonstrated that the annealed LnPO 4 NPs exhibited intense down- and upconversion emission under UV and NIR irradiation, respectively. Notably, through adjusting the LnPO 4 to stabilizer mass ratio, the NP diameter could be tuned in a range between 50 and 200 nm, and the composition of LaPO 4 :Tb 3+ ,Yb 3+ NPs could be easily tuned by adjusting the flow rate ratio of the feed streams.
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Journal of Materials Chemistry B
·
2020
·Vol. 9
·期 4
·1131-1137
·
IF 5.344
Yaling Lin,Jie Hu,Luyan Wu,Qilin Zou,Dejian Chen,Decai Huang,Hongyu Lu,Shi-Bin Wang,Haomiao Zhu
Persistent luminescence nanoparticles (PLNPs) emitting in the NIR window (700–1700 nm) have shown great promise in the field of fluorescence imaging due to their unique properties, including the absence of in situ excitation and low optical scattering in tissues. However, they are still facing some challenges, such as irregular shape, wide size distribution and poor persistent luminescence performance. Here, we report a facile mesoporous template method for synthesizing mSiO2@Zn0.6Ca0.4Ga2O4:Cr3+,Yb3+ (mSiO2@ZCGO) persistent luminescent nanoparticles, which show a regular morphology and a size of about 69 nm. In addition, these nanocrystals exhibit persistent luminescence in multi-NIR windows, the first infrared window (∼696 nm of Cr3+ emission) and second infrared window (∼1000 nm of Yb3+ emission). Under illumination of a 254 nm UV lamp for 10 min, the persistent time of Cr3+ ions and Yb3+ ions lasted more than 120 min and 10 min, respectively. In particular, the NIR persistent emission of mSiO2@ZCGO could be stimulated by soft X-ray, which is beneficial to long-term imaging in deep tissues. The optical penetration length of Yb3+ ions persistent luminescence was evaluated to be 2.8 mm. These results demonstrate the great promise of mSiO2@ZCGO for deep-tissue bio-imaging.
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INFRARED PHYSICS & TECHNOLOGY
·
2021
·
IF 2.638
Yuxin Pan,Hui Lin,Ruijin Hong,Dawei Zhang,Haojie Sun
A series of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramics have been sintered at 1780 °C by high temperature solid state reaction under oxygen atmosphere. The absorption spectra , fluorescence spectra and fluorescence decay curve were discussed. The Judd-Ofelt (J-O) theory was applied to obtain the values of Ω 2 = 13.95 × 10 −20 cm 2 , Ω 4 = 3.94 × 10 −20 cm 2 and Ω 6 = 0.87 × 10 −20 cm 2 , respectively. After doping the Ce 3+ ions, the σ em of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic at 2094 nm increased from 5.67 × 10 −20 cm 2 to 7.26 × 10 −20 cm 2 . These results demonstrate that Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic could be promising for 2 μm region.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Mei-Hong Liu,Teng-Teng Li,Xiao Wang,Da-Yu Liu,Ning Yuan,De-Long Zhang,Yue Tian
Er 3+ /Yb 3+ -codoped CaIn 2 O 4 nano-fibers with good morphology were synthesized by electrospinning technique. X-ray diffraction was performed on the synthesized phosphor of nano-fibers to confirm that the CaIn 2 O 4 crystalline phase is dominant in it. The morphology of the nano-fibers was characterized by scanning electron microscopy. Optimal power supply voltage and thickener concentration for the synthesis were obtained. Er 3+ 980-nm-upconverted emission characteristics of the nano-fibers were investigated. The results show that two-photon process is the dominant mechanism for the upconversion emissions. The nano-fibers doped with 5 mol% Er 3+ display the strongest upconversion fluorescence. Temperature characteristics of the green 530 and 550 nm upconversion fluorescence of the nano-fibers were also studied for thermometry purposes. The results reveal that the nano-fibers show thermally stable spectral structure and the ones doped with 5 mol% Er 3+ display the highest thermal sensitivity of green fluorescence intensity ratio. We conclude that there exists an optimal Er 3+ concentration of 5 mol%, and the CaIn 2 O 4 nano-fibers doped with this optimal Er 3+ concentration display some spectroscopic properties favorable for ratiometric thermometry in the high-temperature regime.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Wei Xu,Yuwei Hu,Longjiang Zheng,Zhiguo Zhang,Wenwu Cao
Optical temperature sensors based on rare earth ions activated luminescent materials have presented their capabilities in thermal reading with good stability and high spatial resolution. The ongoing challenge is to improve the luminescence for further enhancing temperature measurement sensitivity and accuracy. Here, several Er 3+ -Yb 3+ codoped CaWO 4 phosphors are prepared and Cr 3+ ions are introduced, trying to modify the upconverion (UC) emissions from Er 3+ ions. Under the excitation of 980 nm laser, green UC luminescence from 2 H 11/2 and 4 S 3/2 states of Er 3+ is successfully strengthened with Cr 3+ codoping. Through the analysis of characterization by scanning electron microscopy, X-ray diffraction, Raman spectroscopy , and time-resolved spectroscopy, it is found that the dopant of Cr 3+ ions could affect the crystallinity and distort the crystal structure of the as-prepared samples. The thermometry behavior based on green emissions of Er 3+ is studied via fluorescence intensity ratio method. It is interesting to observe that the temperature sensing performance has also been influenced by the incorporation of Cr 3+ . When introducing 9 mol% Cr 3+ ions into Er 3+ -Yb 3+ codoped CaWO 4 phosphors, a maximum sensitivity of about 1.91% K −1 has been achieved. Combined with the intense green luminescence, CaWO 4 : Er 3+ -Yb 3+ -Cr 3+ would be a promising candidate for optical thermometry with excellent measurement sensitivity and accuracy.
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