MATERIALS LETTERS
·
2012
·
IF 2.307
Yanjie Liang,Kangning Sun,Weili Wang,Pengfei Chui,Xiaolin Sun
In this paper, YVO 4 :Yb 3+ ,Er 3+ microspheres have been successfully prepared through a facile hydrothermal method assisted with disodium ethylenediaminetetraacetic acid and citric acid. X-ray diffraction, field emission scanning electron microscopy , energy disperse X-ray spectroscopy, high resolution transmission electron microscopy , and photoluminescence spectra were used to characterize the samples. The results reveal that the as-prepared YVO 4 :Yb 3+ ,Er 3+ samples are well-crystallized and spherical in shape. Moreover, the microspheres with diameters of 6–8 μm are assembled by numerous submicron cuboids. Under the excitation of a 980 nm laser diode , the samples show the characteristic emissions of Er 3+ and the green emissions at 525 nm of 2 H 11/2 → 4 I 15/2 are dominantly strong.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Yurun Ma,Pingsun Qiu,Dongfang Xu,Jinrong Lin,Yanxue Tang,Feifei Wang,Xiyun He,Ziyao Zhou,Nianxiang Sun,Xinyang Zhang,Yi Zhou,Dazhi Sun
NaYF 4 nanorods , and nanoparticles co-doping with Yb 3+ and Er 3+ were synthesized by hydrothermal method . The effects of doped ion concentration, the ratio of NaF to Ln (NO 3 ) 3 and the reactant content on the luminescence properties of the nanocrystals were investigated in detail in this paper. The materials were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and photoluminescence (PL) spectra. The results indicate that a doping level of 20 mol% Yb 3+ and 2 mol% Er 3+ gives the strongest luminescence, and concentration quenching occurs, when Er 3+ concentration exceeds 5 mol%. Besides, the reaction of temperature and time were also investigated and the results showed that they have an effect on the shape, size, and crystal phase purity of the nanoparticles . The luminescence mechanism for the NaYF 4 :Yb 3+ , Er 3+ was discussed. Under 980 nm excitation, the Er 3+ ions doped into NaYF 4 samples emitted green fluorescence 520 nm ( 4 H 11/2 → 4 H 15/2 ), 550 nm ( 4 S 3/2 → 4 H 15/2 ) and red fluorescence 650 nm( 4 F 9/2 → 4 I 15/2 ), which were modified and enhanced by Yb 3+ ions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Wenbin Zhang,Longjiang Zheng,Wei Xu,Leipeng Li,Zhiguo Zhang
Non-contact optical thermometry, based on the luminescence intensity ratio (LIR) of two thermally-coupled levels (TCLs), has received increasing attentions nowadays. Designing novel TCLs-based temperature sensor becomes one of the most significant things in the field of optical thermometry. In this work, a novel strategy for temperature measurement is proposed. It is based on the 4 F 7/2 and 4 S 3/2 TCLs, rather than the widely studied 2 H 11/2 and 4 S 3/2 TCLs of Er 3+ . Both the two pairs of TCLs have been confirmed to be under the control of the Boltzmann distribution and thus can be used for luminescence ratiometric thermometry. The former TCLs have a larger energy gap (1808 cm −1 ) than the latter ones (711 cm −1 ). Based on this fact, it is shown here that using the 4 F 7/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 transitions can achieve a more sensitive temperature measurement than that depending on the 2 H 11/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 transitions at the operating temperatures from 333 to 773 K. At 333 K, the relative sensitivity ( S R ) of the former two transitions is calculated to be ~2.3% K −1 . By comparison, using the latter two transitions only has a S R of 0.9% K −1 at the same temperature.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Hong-Lan Liu,Lin-Lin Zhu,Wei-Ming Guo,Hua-Tay Lin
The highly transparent novel high-entropy (Lu 0.2 Y 0.2 Gd 0.2 Yb 0.2 Er 0.2 ) 2 O 3 ceramic was successfully fabricated by the addition of 3 at.% ZrO 2 and 10 at.% La 2 O 3 introduced as sintering additives via vacuum sintering. A single-phase solid solution cubic structure of the ceramic was obtained with a relative density of 99.95 % and an average grain size of 6.91±3.28 µm. The grain boundary of the (Lu 0.2 Y 0.2 Gd 0.2 Yb 0.2 Er 0.2 ) 2 O 3 ceramic was clean with a thickness of only 1.3 nm. Further observations revealed uniform distribution of all elements in the grains, and the presence of La and Zr segregation (1.5 nm thick) at few grain boundaries, but causing very little light scattering. The in-line transmittance of high-entropy (Lu 0.2 Y 0.2 Gd 0.2 Yb 0.2 Er 0.2 ) 2 O 3 ceramic reached 80 % at 1100 nm, which was 98.7 % of the theoretical value of Er 2 O 3 single crystal. Also, there were fluorescence emissions observed in the ultraviolet (311 nm), visible (563, 622 nm), and near-infrared (1032, 1535 nm) regions. In addition, the intense red emission and weak green emission were detected, and the broad emission with a peak at 1.5 μm was attributed to Stark splitting of Er 3+ ions, so the corresponding mechanism was discussed. Results obtained suggest that the highly transparent novel high-entropy (Lu 0.2 Y 0.2 Gd 0.2 Yb 0.2 Er 0.2 ) 2 O 3 ceramic fabricated in this study could have broad application prospects in optical applications such as scintillators, up-conversion luminescent materials, and infrared lasers.
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
ECS Journal of Solid State Science and Technology
·
2016
·Vol. 5
·期 9
·R137
·
IF 1.65
Wenjuan Bian,Yushuang Qi,Xuhui Xu,Dacheng Zhou,Yong Yang,Jianbei Qiu,Xue Yu
The influence of the introduction of Li+ ions on the upconversion (UC) properties of KLu2F7:Yb3+, Er3+ nanocrystalline has been investigated in detail. It is found that the UC emission intensity of 10 mol% Li+ ions doped KLu2F7:Yb3+, Er3+ nanocrystalline is enhanced about 13 times in comparison with that of Li+-free sample. Under the excitation of 980 nm laser diode (LD), a significant improvement of the green to red emission ratio (GRR) in the 10 mol% Li+-doped sample is observed by increasing pump power density. Li+ ions could occupy the cationic sites or the interstitial sites in the KLu2F7 host matrix, which probably eliminate the defect states via the charge compensation and tailor of the crystal field, leading to the promotion of the UC emission efficiency. Thus, the introduction of Li+ ions provides new opportunities for enhancing the scope of applications of Yb3+, Er3+ doped KLu2F7 nanocrystalline ranging from infrared solar cells to volumetric multiplexed bio-probe.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
光学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 42
·期 1
·1332-1338
·
IF 2.605
Tao Wei,Ying Tian,Cong Tian,Xufeng Jing,Bingpeng Li,Junjie Zhang,Shiqing Xu
Er 3+ doped NaYF 4 transparent aluminosilicate glass ceramic was prepared. X-ray diffraction and transmission electron microscopy confirmed the formation of NaYF 4 nanocrystals in glass matrix . Absorption spectra and Judd–Ofelt intensity parameters demonstrated the incorporation of Er 3+ into NaYF 4 nanocrystals. 2.7 μm emission due to the transition of 4 I 11/2 → 4 I 13/2 was achieved upon the excitation of a 980 nm laser diode . Visible emission spectra , decay curves at 1.53 μm and energy transfer mechanism were studied to elucidate 2.7 μm luminescent behaviors. Er 3+ doped NaYF 4 embedded aluminosilicate glass ceramic might provide a new choice for mid-infrared laser and amplifier.
研究领域:
材料科学
·
光子学
·
光学材料
·
稀土掺杂
·
激光技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3380-3386
·
IF 1.339
Yu Shiyong,Zhi Yunxia,Su Haiquan
A series of rare-earth ions (Er3+ and Yb3+) Co-doped CaF2 upconversion luminescent nanomaterials have been successfully prepared via a facile hydrothermal method using pluronic p123 (p123), pluronic F127 (F127) and sodium citrate as surfactants at 180
°C with different reaction time. The crystallographic phase, size and morphology can be controlled by simply tuning the reaction parameters such as the types of surfactants and the reaction time. It is found that reaction time and surfactant play a key role in forming the nanocrystals
with different morphologies. X-ray diffraction, field-emission scanning electron microscopy FE-SEM, and photoluminescence spectra were used to characterize the structure, morphology and upconversion luminescence properties of CaF2:Er3+/Yb3+ upconversion nanomaterials,
respectively. The experimental results indicate that three monodispersive and highly uniform CaF2:Er3+/Yb3+ nanocrystals with mean size of 200 nm, 3 um, and 700 nm have cubic and sphere shapes, respectively. While the possible mechanisms of upconversion luminescence
are analyzed by the diagram of proposed energy transfer mechanisms, the schematic energy level diagrams showing typical upconversion processes for Er3+ also reveals that the as-synthesized CaF2:Er3+/Yb3+ nanomaterials may be in the cubic structure
with space group Fm-3m, in which Ln3+ cations occupy crystal lattice positions with lower point symmetry, leading to a high upconversion efficiency under the excitation of a 980 nm diode laser.
研究领域:
材料科学
·
纳米技术
·
发光材料
·
稀土掺杂
·
光学材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qibai Wu,Shaoteng Lin,Zhongxiang Xie,Liqing Zhang,Yannan Qian,Yaodong Wang,Haiyan Zhang
Monodisperse Y 2 O 3 : Er 3+ /Yb 3+ /Tm 3+ nanoparticles with various dopant concentrations have been synthesized successfully by a homogeneous precipitation method. Their phase structures and surface morphologies have been characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The diversities of upconversion luminescence spectra and CIE coordinates of prepared samples are investigated in detail at room temperature under 980 nm excitation. Through adjusting the concentrations of Yb 3+ , Tm 3+ and Er 3+ ions, three upconversion emission bands in red, green and blue region could be tunable to achieve the color of interest and near white light emission can be obtained in the tri-doped Y 2 O 3 nanoparticles for a variety of application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xuekai Wang,Yongze Cao,Yuanbing Mao,Tianshuo Liu,Xianglan Yan,Lei Li,Jinsu Zhang,Baojiu Chen
Low phonon tantalate-based phosphors with a layer structure are considered to have excellent upconversion luminescence (UCL) intensity, which could be reduced due to the existence of impure phase defects and inappropriate doped rare earth ions. To improve their UCL performance, we have prepared single-phase CaTa4O11:Er3+/Yb3+ samples by a molten salt synthesis (MSS) using KCl as the reaction medium and compared its UCL properties with counterparts made by a conventional solid-state reaction (SSR) in this study. We have demonstrated that the MSS samples have a much higher UCL intensity under 980 nm laser excitation than the SSR ones due to accurate replacement of Ca2+ sites by Er3+/Yb3+ in high-purity single-phase MSS samples. We have further enhanced the green UCL intensity of the MSS samples by 1.57 times via acid picking (AP). Under 980 nm laser excitation at a high powder density of 61.3 W/cm2, the green UCL intensity of the MSS-AP samples can reach 3.72 times that of the SSR-AP samples. For potential luminescence thermometry applications, the maximum absolute sensitivity (SA) of the MSS-AP samples reaches 0.01316 K–1 at 501 K based on the luminescence intensity ratio. This study shows that CaTa4O11:Er3+/Yb3+ phosphors prepared by the MSS method are single-phase samples with excellent pure green UCL as a suitable temperature sensing material.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Longchao Liu,Hailian Liu,Wenqian Zou,Shoujun Ding
Trivalent erbium (Er 3+ ) doped trivalent ytterbium (Yb 3+ ) stoichiometric upconversion (UC) phosphors YbTaO 4 (YbTaO 4 :Er 3+ ) synthesized using the high temperature solid-state reaction method. The phase structure was analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM) and XRD Rietveld refinement methods. The vibration of the bonds was revealed through Fourier transform infrared (FT-IR) spectroscopy. The multi-photon UC green and red luminescence were investigated upon excitation with a 980 nm semiconductor laser , and the critical quenching concentration of Er 3+ in the YbTaO 4 stoichiometric host was derived as high as 15 at.%. The power-dependent UC emission spectra confirmed a two-photon population process for the UC green and red emissions. Furthermore, the temperature-dependent UC emission spectra were measured in the range of 300–570 K, and the optical temperature sensing performance of YbTaO 4 :Er 3+ was demonstrated using the fluorescence intensity ratio (FIR) technique. The maximum absolute sensing sensitivity (S A ) and relative sensing sensitivity (S R ) of YbTaO 4 :Er 3+ were determined as 0.0038 K -1 (@450 K) and 0.0102 K -1 (@300 K), respectively. These results suggest that Er 3+ doped YbTaO 4 stoichiometric phosphors hold great promise as upconversion materials for optical temperature sensing applications.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.835
Yan Lu,Tong Zhao,Li Ye,Xudong Sui,Shuaituo Zhang,Junying Hao
La2Zr2O7 nanocrystals doped with Er3+ were prepared from curing and pyrolysis of La2Zr2O7 preceramic precursor modified by erbium acetylacetonate for the purpose of photoluminescence applications. The crystallisation behaviour, microstructure and photoluminescence of the generated ceramics were investigated. The nanocrystals derived from the precursor annealed at 900 °C for 2 h exhibit a single-phase solid solution with an average crystallite size of about 20 nm. The emission band centred at 528 nm was attributed to the 2H11/2→4I15/2 transition, while those at 550 and 562 nm were ascribed to the 4S3/2→4I15/2 transition. The optimal molar ratio of Er3+/Zr4+ for max emission intensity was between 0.04 and 0.06.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）