CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 17
·30879-30886
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IF 5.1
Pengfei Shuai,Qingfeng Guo,Libing Liao,Ke Su,Junjie Ding,Na An,Lefu Mei,Przemysław Woźny,Marcin Runowski
Cryolite-type materials have advantages of low phonon energy, easy rare-earth ion doping, and stable physicochemical properties , and they are considered ideal matrices for up-converting luminescent materials . In this paper, a series of K 3 LuF 6 :Er 3+ ,Yb 3+ up-converting materials with cryolite structure were prepared for the first time by high-temperature solid-phase method. The compositions , structures and luminescent properties were systematically characterized by X-ray powder diffractometry (XRD), field emission scanning electron microscopy (SEM) and fluorescence spectroscopy (PL). Under 980 nm excitation, the sample emission spectra mainly consisted of green and red emission bands with peaks at 525, 546 and 662 nm, corresponding to the 2 H 11/2 - 4 I 15/2 , 4 S 3/2 - 4 I 15/2 and 4 F 9/2 - 4 I 15/2 electron transitions of Er 3+ , respectively. In addition, the temperature sensing characteristics of two thermally coupled energy levels ( 2 H 2/11 and 4 S 3/2 ) were studied based on the fluorescence intensity ratio (FIR) technique in the range of 79–579 K. All the results show that K 3 LuF 6 :Er 3+ /Yb 3+ up-converting luminescent materials have excellent temperature sensing performance in the ultra-wide temperature range and have broad application prospects in the field of temperature sensing.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Qiang Bi,Kechun Wang,Yi Zhao,Guangdong Wu,Yanyan Zhou,Changbin Tang,Zhihua Leng,Juanqin Xue
Graphitic carbon nitride (g-C 3 N 4 ) is restricted by its narrow light absorption range, which results in low photocatalytic efficiency. To address this problem, a plasmon- and upconversion-enhanced ternary photocatalyst (denoted as GdF 3 @g-C 3 N 4 @Ag) was subtly designed and synthesized in situ. The g-C 3 N 4 nanosheets were encapsulated on the GdF 3 by a simple vapor deposition method, which has not been reported in the literature. The GdF 3 @g-C 3 N 4 @Ag composite exhibits full-spectrum responsiveness and remarkably improved photocatalytic activity in the degradation of tetracycline hydrochloride compared with plain g-C 3 N 4 . The degradation rate constant of the best-performing photocatalyst GdF 3 @g-C 3 N 4 @5%Ag (2.618 × 10 −2 min −1 ) is higher than that of g-C 3 N 4 (1.723 × 10 −2 min −1 ) under irradiation at λ ≥ 400 nm. This study develops a full-spectrum responsive photocatalyst based on GdF 3 @g-C 3 N 4 @Ag, showing its great potential to fully utilize the solar spectrum, and provides important insights into the construction of full-spectrum responsive photocatalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9321-9327
·
IF 2.22
Liu Zhen,Chen Dihu
The mixtures of Gd 2 O 3 :Yb 3+ /Er 3+ and Gd 2 O 3 :Yb 3+ /Ho 3+ nanoparticles were successfully prepared via pulsed laser ablation in liquid followed by solution mixing. Under excitation of 980 nm diode laser, tunable color from green to red emission was achieved. Based on the thermal linked energy levels, the temperature sensitive upconversion emission was observed. The fluorescence intensity ratio ( FIR ) of I 513–530 nm / I 530–580 nm increased as the elevation of temperature. The absolute sensitivity and relative sensitivity were derived from temperature dependent FIR . The results show that the mixture of Gd 2 O 3 :Yb 3+ /Er 3+ and Gd 2 O 3 :Yb 3+ /Ho 3+ nanoparticles are not only potential candidates for multicolor upconversion luminescence but also promising optical materials for non-contact optical thermometry.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Haoyue Hao,Hongyu Lu,Guanghong Ao,Yinglin Song,Yuxiao Wang,Xueru Zhang
The nearly pure green and red emissions of Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 were realized by tri-doping Eu 3+ and Ce 3+ , respectively. The Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 powder, radiating intense green and red emissions, was prepared by a typical sol-gel method. Under the excitation of 980 nm laser, the red-to-green ratio was tuned from 0.2 to 4 as the concentration of Eu 3+ changed from 6 to 0 mol%, attributed to the energy transfer processes between Ho 3+ and Eu 3+ . Meanwhile, the red-to-green ratio altered from 4 to 20 as the concentration of Ce 3+ changed from 0 to 20 mol% via the cross relaxing processes between Ho 3+ and Ce 3+ . The prepared phosphors, possessing large tuning range of red-to-green ratio and resisting high temperature, can be potentially applied to colorful display and solid-state lighting.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态照明
·
显示技术
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shuai Hu,Maohui Yuan,Hanchang Huang,Changqing Song,Kai Han,Wenda Cui,Zining Yang,Hongyan Wang
Flame aerosol synthesis (FAS) is an excellent strategy for continuous, fast, and mass production of small-size upconversion nanoparticles (UCNPs), which have high potential applications in fields like biological imaging, colour display and optical temperature sensing. However, flame-made UCNPs have received less attention, and relevant studies are limited. Herein, for the first time, we successfully fabricated cerium (Ce)-doped homogeneous ultrasmall Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs using a liquid-fed FAS method. Ce was doped to improve the upconversion luminescence (UCL) of the Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. The overall UCL intensity was enhanced ∼77.9-fold for an optimal concentration of 20 mol% Ce-doped UCNPs, compared with the UCNPs without Ce doping with a relatively homogeneous ultrasmall size of 8–10 nm. Further studies confirmed that both trivalent (Ce 3+ ) and tetravalent (Ce 4+ ) simultaneously exist in the Y 2 O 3 hosts and are critical in enhancing the UCL properties. In addition, the fluorescence intensity ratio (FIR) method was used to evaluate the thermal properties of the fabricated UCNPs. Ce doping significantly improved the thermal sensitivity of Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. An excellent relative sensitivity ( S R ) of 0.622% K −1 at 598 K was obtained for flame-made UCNPs doped with 20 mol% Ce.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 42
·15897-15905
·
IF 8.067
Hanchang Huang,Maohui Yuan,Zhongyang Xing,Wenda Cui,Tongcheng Yu,Shuai Hu,Guomin Zhao,Chuan Guo,Kai Han
In lanthanide-sensitized upconversion (UC) nanomaterials, the typical sensitizer Yb3+ can significantly modulate the codoped activator (such as Er3+ ions) to generate multiband transitions. However, the kinetics of these multiband emissions affected by the Yb3+ concentration remains unclear. In this work, we employ nanosecond time-resolved spectroscopy to investigate a single optically trapped NaYF4:Yb/Er microcrystal (MC) doped with different Yb3+ concentrations. Interestingly, high doping Yb3+ ions shorten the UC response time by a factor of 10 (from ∼1 μs to ∼100 ns) compared to low doping Yb3+. Meanwhile, 430 nm light (4G7/2 → 4I11/2) emitted before 654 nm (4F9/2 → 4I15/2) with Yb3+ dramatically increasing (opposite to the normal low Yb3+ doping cases), representing a new four-photon pathway (4I15/2 → 4I11/2 → 4F7/2 → 2H11/2 →4S3/2 → 2G7/2 → 4G11/2 → 2H9/2 → 2D5/2 → 4G7/2). Furthermore, we observed a broad range of time-dependent emission color, changing from being initially green over near-white to red. Particularly, the red emission is dominated in the decay process, yielding insight into the fundamental multiband UC kinetics. The result shows that varying the Yb3+ doping concentration provides a way to control the energy flow between the energy levels of Er3+ ions, which can modulate the response time and color evolution of UC on Yb/Er doped materials. This can direct the prospective development of fast-response optoelectronic devices, photocatalysis, and UC displays in the future.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Huocheng Lv,Laihui Luo,Weiping Li,Peng Du
To ameliorate the inherent thermal quenching behaviors of upconverting materials, a series of Ho3+/Yb3+-codoped Al2Mo3O12 (i.e., Al2Mo3O12:Ho3+/2xYb3+) microparticles were developed. Upon excitation at 980 nm, intense upconversion (i.e., UC) emissions arising from Ho3+ are observed, and their optimal states occur at x = 0.09. Besides, the UC mechanisms of these generated emissions from 5F4/5S2 and 5F5 levels all pertain to a two-photon absorption process. Furthermore, modified thermal quenching performances are realized in the resultant microparticles, in which the intensities of the UC emissions arising from 5F4/5S2 levels decrease as the temperature increases, while that of the UC emission from the 5F5 level increases and then decreases with the increase of temperature. The coexistence of nonradiative transition promoted crossrelaxation, and energy transfer routes can be responsible for the above phenomenon. By studying the diverse UC emission characteristics at high temperatures, we revealed the thermometric properties of Al2Mo3O12:Ho3+/2xYb3+ microparticles, where their sensitivities can be regulated by selecting the spectral mode and dopant contents. According to the intensity ratio of the UC emissions originating from 5F5 → 5I8 to (5F4,5S2) → 5I7 transitions at different temperatures, one obtains that the relative and absolute sensitivities of the developed compounds reach up to 0.464% and 0.1739 K–1, respectively. Additionally, by the analysis of the thermochromic performances of final products, their thermometric characteristics were also investigated. Note that the environmental temperature is able to be facilely read out by distinguishing the emitting color. These results verify that the Al2Mo3O12:Ho3+/2xYb3+ microparticles are promising luminescent materials for multimode visual optical thermometry.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6469-6478
·
IF 3.591
Qingling Zeng,Wenxiang He,Fangfei Luan,Yu Yan,Hongli Du,Juan Fu,Dongcai Guo
A succession of erbium single-doped and erbium/ytterbium co-doped SrF2 nanoparticles (NPs) were fabricated via a hydrothermal synthesis technique followed by high-temperature calcination. Structural, morphology, and element information of SrF2 NPs were explored using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) instruments. Under near-infrared (NIR) excitation, the SrF2:Er3+ NPs exhibit a prominent red emission peak (at 670 nm) as well as two oppositely faint green emission peaks (at 525 nm and 548 nm). The probable mechanism of the dominant red up-conversion luminescence (UCL) emission was systematically studied by UC emission spectroscopy, Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR) and diffuse reflectance spectrum analyses. We used the energy gap law to estimate the probability of electronic transition, which determines the UCL emission route. The behavior of the R/G value (emission intensity of red to green ratio) and the slope n (the number of photons absorbed during the excitation process) reflected the existence of a highly efficient cross-relaxation (CR) effect during the UC process in the SrF2 system, so we can infer that the prominent red UCL emission is due to the CR effect among adjacent erbium atoms. After co-doping with ytterbium ions, the red UCL emission intensity is further enhanced. By comparing 2 mol% Er3+,5 mol% Yb3+ co-doped SrF2 samples with a similar composition without ytterbium doping, a red UCL emission intensity enhancement of about 200 times was observed. This increase is ascribed to the existence of effective energy transfer up-conversion (ETUC) from ytterbium to erbium, and the presence of a large absorption peak of ytterbium in the range of 830–1060 nm was observed in the diffuse reflectance spectrum, indicating that ytterbium's ability to absorb 980 nm photon energy is significantly stronger than erbium's. The strong red radiation obtained for erbium/ytterbium co-doped SrF2 NPs is expected to have potential application prospects in in vivo bio-imaging and photodynamic therapy.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Dongxun Chen,Fang Wang,Jianqiang Bi,Weili Wang,Lu Wang,Kangning Sun,Dongqi Tang,Yanjie Liang
Bi 2 O 3 nanospheres co-doped with Yb 3+ /Er 3+ upconverting ions pair have been successfully synthesized via a facile hydrothermal method followed by a heat treatment. The resulting Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres show a monodisperse spherical morphology with narrow size distribution (~180 nm) and display intense upconversion luminescence under 980 nm laser excitation. It is found that the crystal structure, morphology and upconversion luminescence properties of nanospheres have a direct relationship with the doping concentration of Yb 3+ and the subsequent calcination temperature. These Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres can be prepared in large quantities and can be easily modified with a layer of biocompatible polyethyleneimine (PEI) molecules. The yielded nanospheres could not only maintain uniform size and morphological characteristics, but also show good water dispersibility and biocompatibility. Remarkably, these Bi 2 O 3 :Yb 3+ ,Er 3+ upconversion nanophosphors could also act as an effective contrast agent for X-ray computed tomography (CT) imaging, which show higher contrast efficacy than commercial iodine-based contrast agent. The proposed facile synthetic route and inexpensive matrix materials pave the way for broad use of these Bi 2 O 3 :Yb 3+ ,Er 3+ nanospheres as ideal dual-mode bioimaging probes in biomedical field.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 48
·15269-15275
·
IF 6.641
Hui Zhang,Jiatao Ye,Xiuli Wang,Shilong Zhao,Ruoshan Lei,Lihui Huang,Shiqing Xu
Accurate and remote temperature measurements in harsh environments are of great importance. The FIR technique is self-referenced and regarded as a promising method to improve the temperature accuracy and simplify the experimental devices. Herein, a point all-fiber temperature sensor based on the FIR technique has been developed. Er3+/Yb3+ co-doped NaYF4 phosphors (NPs) were used to fabricate a temperature sensing probe combined with silica fiber. Highly crystalline and pure hexagonal NPs were synthesized by a hydrothermal method. Intense green up-conversion luminescence was observed in the prototype sensor at an excitation power of 1 mW. The relationship between FIR value and temperature was investigated at the temperature range of 258–423 K. The maximum relative temperature sensitivity is 1.68% K−1 at 258 K. Preliminary experimental results indicate that the absolute error is ±1 K with a temperature uncertainty σ of 0.187 K and relative standard deviation of 0.133%, suggesting the high accuracy and reliability of the proposed all-fiber temperature sensor.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Guo Gong,Ya Song,Haihu Tan,Shaowen Xie,Changfan Zhang,Lijian Xu,Jianxiong Xu,Jie Zheng
Lanthanide-doped NaYF 4 upconversion luminescent nanophosphors have attracted great interest for anti-counterfeiting applications. However, low luminescent intensity caused by surface defects and low extinction coefficients of lanthanide dopants greatly limits their practical applications. Herein, we developed core/active-shell NaYF 4 :Ln 3+ @NaYF 4 :Yb 3+ (e.g. NaYF 4 :Er 3+ /Tm 3+ @NaYF 4 :Yb 3+ , NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 :Yb 3+ , and NaYF 4 : Yb 3+ /Tm 3+ @NaYF 4 :Yb 3+ ) nanophosphors with enhanced near-infrared (NIR)-to-visible upconversion luminescence by coating Yb 3+ -doped NaYF 4 shell (active-shell) on NaYF 4 :Ln 3+ upconversion core nanoparticles . The structure, morphology, and elemental composition of NaYF 4 :Ln 3+ @NaYF 4 :Yb 3+ core/active-shell nanoparticles (CASNs), NaYF 4 :Ln 3+ @NaYF 4 core/inert-shell nanoparticles, and NaYF 4 :Ln 3+ core nanoparticles were characterized and compared systematically to reveal their structure-property relationship. Collective data showed that coating of a NaYF 4 :Yb 3+ active shell on NaYF 4 :Ln 3+ cores significantly enhanced upconversion luminescent intensity by ~21 times, while an inert (pure NaYF 4 ) shell coated on the surface of NaYF 4 :Ln 3+ core only resulted in 5.2 times luminescence enhancement. The enhanced upconversion luminescence intensity was mainly attributed to (i) the NaYF 4 shell-reduced quenching effect and (ii) the promoted transformation of the absorbed NIR light from the pump source to the core nanoparticles by Yb 3+ sensitizer in the active shell. Moreover, by tailoring dopant pairs and molar ratios of lanthanide ions in the core nanoparticles, three CASNs with enhanced red, green, and blue upconversion luminescence were obtained and fabricated into environmental benign luminescent inks. The inkjet printing of RGB CASNs inks on papers produced multiple-color, high-resolution, complex luminescent patterns under 980 nm laser. This work expands the lanthanide-doped NaYF 4 materials for anti-counterfeiting applications.
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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
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高影响因子
危险品化学品经营许可证（带存储）