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
MINERALS ENGINEERING
·
2020
·
IF 3.795
Li Chen,Hailian Li,Ji Chen,Deqian Li,Tianchi Liu
Incomplete stripping and high acidity consumption were the major drawbacks for the separation of heavy rare earth elements (HREEs) by the popular extractant 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507). This article studied di-(2-ethylhexyl) phosphinic acid (P227) from thermodynamics and kinetics theoretical researches to cascade extraction simulations for the separation of HREEs. P227 was capable of complete stripping for HREEs with low acidity, and had high organic REE loading with clear and fast phase separation. Constant interfacial area cell with laminar flow was implemented to reveal the different kinetics mechanisms for the extraction and stripping of Lu 3+ . The multi-stages of cascade extraction simulation designed for the separation between Er 3+ /Tm 3+ could be of great significance for practical application. Corresponding products with high purity at both exits obtained successfully via the simulation. All these will provide the promising industrial applications of P227 with more fundamental data and guidance.
研究领域:
化学工程
·
稀有金属提取
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 6
·1168-1173
·
IF 0
Jie Chang,Ye Liu,Jie Li,Suli Wu,Wenbin Niu,Shufen Zhang
Due to the strong tissue absorption of short-wave-length light below 600 nm, in vivo imaging based on UCNPs as luminescent probes is still limited. The NIR spectral range (700–1100 nm) and the red region (600–700 nm) are referred to as the “optical window” of the biological tissues because the light scattering, absorbance and autofluorescence of tissue are minimum in this range. Here we synthesized NaYF4:Yb3+,Tm3+/CdS nanoheterostructures. In the nanoheterostructures, the red (700 nm) and NIR (802 nm) emissions of NaYF4:Yb,Tm were enhanced by 7.3 times, while the blue emission peak at 476 nm nearly disappeared and no peak of CdS appeared. Transmission electron microscopy (TEM) images show that the morphology of the binary nanoparticles is predominantly peanut-like and the X-ray diffraction (XRD) patterns of the NaYF4:Yb3+,Tm3+/CdS nanoheterostructure were assignable to both wurtzite phase CdS and hexagonal phase NaYF4:Yb3+,Tm3+. In comparison, introducing Cd2+ ions or S2− ions or preparation of physical mixture of NaYF4:Yb3+,Tm3+ and CdS did not enhance the red (700 nm) and NIR (802 nm) emissions of NaYF4:Yb, Tm. These results indicated that the interactions in the NaYF4:Yb3+,Tm3+/CdS nanoheterostructure played a key role for enhancing the NIR emission of NaYF4:Yb3+,Tm3+ nanocrystals. QDs act as a sub energy level to mediate energy transfer of Tm3+. To evaluate the effect of other QDs on the upconverted fluorescence spectrum of NaYF4:Yb3+,Tm3+, NaYF4:Yb3+,Tm3+/CdSe nanoheterostructures were also prepared by a similar method. The upconverted fluorescence spectra indicated that by conjugation with CdSe, the NIR emission at 802 nm of NaYF4:Yb3+,Tm3+ was also enhanced greatly.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 6
·1823-1828
·
IF 2.61
Jin Wang,Haoran Zhang,Bingfu Lei,Hanwu Dong,Haiming Zhang,Yingliang Liu,Mingtao Zheng,Yong Xiao
While the reddish-orange emitting phosphors M 2 Si 5 N 8 :Eu 2+ (M = Ca, Sr) have been intensively investigated as potential materials for white-light-emitting diodes, in this study, optical energy storage properties of (Ca 1− x Sr x ) 2 Si 5 N 8 : Eu 2+ , Tm 3+ ( x = 0–1) solid solutions were tuned by cation substitution, which was commonly used to tune color point for improving w-LEDs. Partial substitution of either Ca by Sr or Sr by Ca resulted in a redshifted Eu 2+ emission which had a demarcation point at x = 0.5. Furthermore, the (Ca 1− x Sr x ) 2 Si 5 N 8 : Eu 2+ , Tm 3+ materials exhibited similar persistent- and photostimulated luminescence behaviors with a maximum intensity at about x = 0.2. Such optical energy storage characters of the samples were attributed to the more appropriate trap depths (322–333 K) and higher density of energy level traps indicated by the thermoluminescence analysis.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Yinghao Wei,Sen Yang,Kaihang Zhu,Linshuo Gao,Liji Wang,Guanying Chen,Ai-Hua Li
Weak luminescence of the small-sized lanthanide-doped nanoparticles has limited their applications long. In recent years, there is a growing interest in luminescence thermal enhancement in small-sized upconversion nanoparticles (UCNPs). The mitigation of surface quenching effects and the improvement of energy transfer (ET) are two convincing explanations for this phenomenon. A systematical investigation on the luminescence dynamics of Yb 3+ is implemented. ET rate and then the proportion of ET increases greatly with rising temperatures in Yb 3+ /Tm 3+ codoped system, while an alternative trend can be summarized in Yb 3+ /Er 3+ one. Based on these findings, therefore it can be concluded that the surface quenching mitigation related to the desorption of water molecules on the surface is a common mechanism of the luminescence thermal enhancement. But ET related to the thermally-activated surface phonons is a special case, it does play a positive role in Yb 3+ /Tm 3+ system. These findings not only explain the upconversion luminescence thermal enhancement in Yb 3+ /Tm 3+ system is more significant but also help to understand thermal enhancement and benefit highly-sensitive temperature probe design.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Optical Materials Express
·
2014
·Vol. 4
·期 6
·1186-1196
·
IF 2.923
E. H. Song,S. Ding,M. Wu,S. Ye,Z. T. Chen,Y. Y. Ma,Q. Y. Zhang
Tunable broadband white upconversion (UC) luminescence has been demonstrated in Yb3+/Tm3+/Mn2+ tri-doped KZnF3 nanocrystals from the excitation of a 976 nm laser diode (LD). The white light is composed of three sharp band peaks at 480, 650 and 700 nm, originating from the UC emissions of Tm3+ ions, and one broad band centered at 585 nm, originating from exchange-coupled Yb3+–Mn2+ dimers. The effects of the concentration, pump power and temperature on the UC luminescence properties of KZnF3:Yb3+,Tm3+,Mn2+ nanocrystals have been investigated. By changing the Mn2+/Tm3+ content ratio, various colors of the UC luminescence can be easily obtained in KZnF3:Yb3+,Tm3+,Mn2+ nanocrystals, which gives these nanocrystals potential applications in the fields of lighting, displays and lasers.
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 LUMINESCENCE
·
2023
·
IF 3.6
Li He,Jinshu Huang,Zhengce An,Haozhang Huang,Yu Zhao,Kexin Zhong,Bo Zhou
Upconversion-based optical thermometry has many merits, such as quick temperature response, higher thermal sensitivity and robust reliability. However, the previous works were mainly focused on the thermally coupled emissions, limiting their thermal sensitivity due to the intrinsic constraint by small energy gaps (e.g., <2000 cm −1 ) according to Boltzmann distribution theory. Here, we report a design of NaYF 4 :Yb 3+ /Tm 3+ @NaYF 4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity by taking advantage of nonthermally coupled upconversion emissions of Tm 3+ . We show that the blue upconversion emission of Tm 3+ at 475 nm ( 1 G 4 → 3 H 6 ) exhibits a regular decrease with elevating temperature, while its deep-red emission at 696 nm ( 3 F 2,3 → 3 H 6 ) presents an increase. Such a feature leads to a rapid rise of luminescence intensity ratio (I 696 nm /I 475 nm ) and the optimal relative sensitivity (S r ) reaches 2.79 % K −1 (503 K). More interestingly, the sample gives rise to a gradual emission color change from blue to purplish-red with lifting temperature. Our results offer a new class of upconversion-based nonoprobe with high thermal sensitivity and observable emission color variation, showing a great potential for nanoprobe and information security.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3711-3717
·
IF 1.339
Liu Yunxia,Liu Baocang,Xu Guangran,Wang Qin,Hu Wenting,Liu Yang,Jia Wenjing,Liu Yongxin,Zhang Jun
Upconversion luminescent NaYF4:Yb3+, Er3+/Tm3+ nanocrystals were successfully synthesized via a facile and one-pot solvothermal method using oleic acid/oleylamine (OA/OM) as surfactants. The effects of synthetic parameters including rare earth
ion doping concentrations and temperatures on the crystal phase structure, size and shape of NaYF4:Yb3+, Er3+/Tm3+ nanocrystals were systematically investigated. By modulating the synthetic parameters, the shape of NaYF4:Yb3+,
Er3+/Tm3+ nanocrystals were controlled in forms of nanorods and nanowires. The reaction temperature has large effects on the phase structure of NaYF4:Yb3+, Er3+/Tm3+ nanorods, exhibiting a phase transformation from cubic phase
(α-) in low temperatures to hexagonal phase (β-) in high temperatures. Moreover, the upconversion luminescence of NaYF4:Yb3+, Er3+/Tm3+ nanocrystals was found to be dependent on the rare earth ion doping concentrations and
temperatures.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 7
·1249
·
IF 4.324
Jun Xiao,Cong Wang,Xin Min,Xiaowen Wu,Yangai Liu,Zhaohui Huang,Minghao Fang
Advances in solid-state white-light-emitting diodes (WLEDs) necessitate the urgent development of highly efficient single-phase phosphors with tunable photoluminescence properties. Herein, the Tm3+, Dy3+, and Sm3+ions are incorporated into the orthorhombic NaGdTiO4(NGT) phosphors, resulting in phosphors that fulfill the aforementioned requirement. The emission spectrum of Tm3+ions overlaps well with the adsorption spectra of both Dy3+and Sm3+ions. Under the excitation at 358 nm, the single-phase NaGdTiO4: Tm3+, Dy3+, Sm3+phosphor exhibits tunable emission peaks in the blue, yellow, and red regions simultaneously, resulting in an intense white-light emission. The coexisting energy transfer behaviors from Tm3+to Dy3+and Sm3+ions and the energy transfer from Dy3+to Sm3+ions are demonstrated to be responsible for this phenomenon. The phosphors with multiple energy transfers enable the development of single-phase white-light-emitting phosphors for phosphor-converted WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2014
·Vol. 36
·期 11
·1855-1858
·
IF 2.075
Jin Wang,Haoran Zhang,Bingfu Lei,Hanwu Dong,Haiming Zhang,Yingliang Liu,Nuolin Lai,Yun Fang,Zhijie Chen
The red persistent and photo-stimulated luminescent (PSL) nitride phosphor, SrCaSi 5 N 8 : Eu 2+ , Tm 3+ solid solution, had been synthesized through conventional high temperature solid-state reaction. The SrCaSi 5 N 8 : Eu 2+ , Tm 3+ phosphor shows strong photoluminescence (PL) and weak PSL ( λ em = 647 nm), both originating from the 4f 6 5d–4f 7 transition of Eu 2+ . Thermoluminescence (TL) glow curves measured at various stimulating conditions (UV excitation, in dark, laser stimulation after UV irradiation) show the same peak positions at 345 K and 360 K but great differences in the intensities. The afterglow decay curve presents excellent long-lasting red phosphorescence with a decay time of 30 min (⩾0.32 mcd/m 2 ) after turning off the activating light. Moreover, the laser stimulated luminescence spectra, which feature sharp rising and falling edges (monitored at 647 nm) as the infrared laser diode (980 nm) excitation was turned on and off periodically, exhibit interesting rapidly responsive, erasable and rewritable abilities.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光学性质
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
Yong Tang,Qiuyue Ran
This paper synthesized Y 2 O 3 : Yb 3+ /Er 3+ /Tm 3+ fluorescent crystals (YET) by annealing using the laser zone melting method. When the 365 nm(UV) and 980 nm(IR) lasers are excited together, the luminescence color of YET can be changed by adjusting the laser power. It can be adjusted between orange-red, yellow-green, and white. The temperature sensing characteristics based on the fluorescence intensity ratio (FIR) of non-thermally coupled levels (NTCL) and thermally coupled levels (TCL) of Tm 3+ and Er 3+ ions were studied. The derived maximum relative sensitivity ( S R ) reached the impressive value of 10.871 K -1 (303 K) and 0.511 %K −1 (563K), respectively. Moreover, as the temperature increases, the luminescence of the YET emission changes from white to blue. So, the luminescence emitted by YET can be adjusted between red, green, blue, and white. Therefore, using dual lasers to excite fluorescent materials can provide a suitable method for color-adjustable phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Minghan Zhou,Tongtong Gao,Shuanglong Chen,Xuejiao Wang,Qiushi Wang,Cailong Liu
Due to its unique advantages including non-contact operation, high sensitivity, and exceptional spatial resolution, nanoscale optical thermometry has become an indispensable technique with widespread applications in micro/nanoelectronics, integrated photonic systems, and biomedical engineering. Here, Yb 3+ /Tm 3+ co-doped AlN nanowires were successfully synthesized via an arc-discharge method. The nanowires, characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and transmission electron microscopy, exhibit lengths of several micrometers and uniform diameters ranging from 10 to 20 nm, yielding a high aspect ratio. Under 980 nm excitation, the nanowires display distinct up-conversion (UC) luminescence, with emission bands at 544 nm (green), 654 nm and 691 nm (red), and 795 nm (near-infrared), corresponding to Tm 3+ ion transitions. The AlN:Yb 3+ /Tm 3+ nanowires show excellent optical thermometry performance, achieving a maximum relative sensitivity ( S r ) of 3.32 % K −1 at 298 K and a temperature resolution ( δT ) of 0.009 K. These results underscore the potential of AlN:Yb 3+ /Tm 3+ nanowires for advanced optical temperature sensing in nanotechnology, biomedical applications, and high-resolution thermal imaging.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 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）