JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Hao Lin,Dekang Xu,Yongjin Li,Lu Yao,Liqin Xu,Ying Ma,Shenghong Yang,Yueli Zhang
Lanthanide-doped upconversion (UC) materials are commonly excited by 700–1000 nm laser because of Yb 3+ (980 nm excitation) and Nd 3+ (808 nm excitation) are typically used as sensitizers. However, the excitation band located in the second near-infrared window (NIR-II, 1000–1700 nm) demonstrates the deeper penetration in biological tissue with minimum tissue scattering and autofluorescence. Herein, intense red UC emission in Er 3+ -sensitized NaLuF 4 particles under 1532 nm NIR-II excitation is presented. Red UC luminescence is significantly enhanced and purified through confining the 1532 nm excitation energy by Ho 3+ and Tm 3+ mediators, via an energy back transfer pathway (Er 3+ → Ho 3+ → Er 3+ and Er 3+ → Tm 3+ → Er 3+ ). Furthermore, when the particles injected into the fresh beef, red UC luminescence can be distinctly observed from the inside of beef under 1532 nm NIR-II excitation, implying the deep penetration of 1532 nm NIR-II excitation and 660 nm red UC emission. Our results suggest that bright red UC luminescence from Er 3+ -sensitized NaLuF 4 crystals with 1532 nm NIR-II excitation may be suitable for deep optical imaging .
研究领域:
材料科学
·
生物医学工程
·
光学成像
·
纳米医学
·
分子影像
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Wenxia Wu,Daini Wang,Yihua Pan,Yuhua Yang,Peng Zhang,Shoulei Xu,Bernard A. Goodman,Wen Deng
Yttria stabilized zirconia (YSZ) single crystals doped with Tm 2 O 3 , Ho 2 O 3 , and Yb 2 O 3 were prepared by the optical floating zone method in order to investigate the effects of varying the Tm 3+ , Ho 3+ , Yb 3+ contents on the luminescence properties. All samples were shown by powder X-ray diffractometry (XRD) to be in the cubic phase at room temperature with good crystallinity , and the optical bandwidth of about 4.63 eV indicates their suitability for the development of luminescence products. The blue emission peaks from Tm 3+ following excitation with a 980 nm (1.33 eV) laser increased with Tm 3+ content reached a maximum in the crystal with 0.30 mol% Tm 2 O 3 , and then decreased with higher Tm 3+ concentrations as a result of quenching caused by electric dipole interactions. The ratio of the integral intensities of the green emission peaks at 2.42 eV (539 nm) and 2.36 eV (552 nm) indicate that the probability of the non-radiative transition from the 5 F 4 level of Ho 3+ to the 5 S 2 level decreases with increasing Tm 3+ concentration. This research also demonstrates that there was competition between Ho 3+ and Tm 3+ for the transfer of energy from excited Yb 3+ , and that there was also direct transfer of energy from Ho 3+ to Tm 3+ . Thus, in YSZ doped with a combination of rare earth ions , the luminescence properties are determined by a combination of energy transfer processes between the different types of rare earth ions, as well as those for the individual ions, and thus presents an opportunity for fine tuning emissions from such crystals to produce a new generation of materials with intense luminescence properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yutong Sun,Qun Zeng,Yanghong Cheng,Zezhong Li
A series of Tm 3+ /Dy 3+ /Eu 3+ single and co-doped LiNbO 3 color tunable phosphors were synthesized via the solid-state reaction. The phase structure, microscopic topography, optical characteristics, decay lifetimes, energy transfer processes，and thermal stability were comprehensively characterized through combined X-ray diffraction analysis, scanning electron microscope, and advanced spectroscopic methodologies. Following further in-depth analysis, the optimal concentration of dopant ions was determined, and the energy transfer effect between activators in the LiNbO 3 matrix was confirmed. The CIE demonstrated that adjusting the doping concentration of rare earth ions makes it possible to achieve polychromatic tunable light, as well as cool and warm white light. Crucially, Li 0.95 NbO 3 :0.01Tm 3+ /0.02Dy 3+ /0.02Eu 3+ phosphor exhibited remarkable thermal stability, maintaining 97.1 % of its initial strength at temperatures of 423 K. Additionally, WLEDs that have been coated with the aforementioned phosphor on a 365 nm NUV chip emit bright white light, exhibiting a color rendering index of 81.3 and correlated color temperature of 5426 K. It is powerfully suggested that the LiNbO 3 :Tm 3+ /Dy 3+ /Eu 3+ phosphors has the potential to become a new choice for WLED application.
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
·
2020
·
IF 3.28
Xiangyang Song,Kexuan Han,Dechun Zhou,Pengfei Xu,Xiaomeng Xue,Peng Zhang
Tm 3+ doped Bi 2 O 3 -GeO 2 -Na 2 O glass samples were synthesized by conventional melt-quenching method. The Raman spectra measurements showed the maximum phonon energy of prepared glass is 794 cm −1 , which is considerably lower than silicate glasses . Based on the measured absorption spectra , Judd-Ofelt intensity parameters, spontaneous radiative transition probabilities and radiative lifetimes were calculated to elucidate the radiative properties of Tm 3+ in the presented glass. Intense near infrared emission around ~2 μm was obtained under the pump of 808 nm laser diode . A large stimulated emission cross section (5.51 × 10 −21 cm 2 at 1851 nm) of Tm 3+ : 3 F 4 → 3 H 6 was achieved in the prepared bismuth germanate glass doped with 1 mol% Tm 2 O 3 . Besides, the energy transfer processes among Tm 3+ were analyzed using the extended overlap integral method. These results indicate that the presented glass is a promising candidate for ~2 μm laser applications.
研究领域:
光子学
·
材料科学
·
激光材料
·
光谱学
·
稀土掺杂玻璃
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Yin CHEN,Shao-wen XIE,Chao TONG,Hai-hu TAN,Li-jian XU,Na LI,Jian-xiong XU
Novel hydrophilic NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 :Ce 3+ ,Eu 3+ double-jacket microtubes (DJMTs) with upconversion/ downconversion dual-mode luminescence were designed and prepared through epitaxial growth of NaGdF 4 :Ce 3+ , Eu 3+ shell onto the NaYF 4 :Yb 3+ ,Tm 3+ microtube via poly(acrylic acid) (PAA) mediated hydrothermal method. It is demonstrated that PAA ligand played an important role in guiding the direct growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell onto the surface of NaYF 4 :Yb 3+ ,Tm 3+ parent microtubes. The growth of NaGdF 4 :Ce 3+ ,Eu 3+ shell experienced a crystal phase transition from β -NaGdF 4 and β -NaYF 4 mixture to β -NaYF 4 @NaGdF 4 composite crystal, and morphology evolution from mixture of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and β -NaYF 4 :Yb 3+ ,Tm 3+ microtubes to NaYF 4 :Yb 3+ ,Tm 3+ @NaGdF 4 : Ce 3+ ,Eu 3+ DJMTs. The formation mechanism of DJMTs was the dissolution−renucleation of β -NaGdF 4 :Ce 3+ ,Eu 3+ nanorods and the growth of β -NaGdF 4 :Ce 3+ ,Eu 3+ shell via the classical Ostwald ripening mechanism. The as-prepared DJMTs could exhibit blue upconversion and red downconversion luminescence, which was further made into environmentally benign luminescent inks for creating highly secured and fluorescent-based anti-counterfeiting patterns via inkjet printing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2018
·
IF 1.206
Yanling Xu,Zhenni Zhao,Rui Wang,Yuemei Li,Wei Zheng,Zhirong Zhang
12CaO · 7Al2O3 doped with lanthanide is characterized by remarkable and technologically important up-conversion emission. However, the low up-conversion efficiency still remains the main limitation for practical applications. To improve the efficiency, bivalent alkaline earth ions (Mg2+, Sr2+, Ba2+)-tridoped Tm3+/Yb3+/12CaO · 7Al2O3 were synthesized through a high-temperature solid-state reaction. The up-conversion luminescence properties of the samples were investigated by X-ray diffraction, fluorescence spectral measurement pump power, and fluorescence decay curves. The luminescence intensity of samples was significantly enhanced by bivalent alkaline earth ions. 12CaO · 7Al2O3 doped with Sr2+ ions has stronger effects on up-conversion enhancement, which is better than Mg2+ and Ba2+. The up-conversion emission intensity was enhanced by 318 times and the red emission intensity by 218 times with 10 mol% Sr2+ ion. Additionally, the blue and red up-conversion emission peaks at 475 and 650 nm corresponding to energy transitions of 1G4 → 3H6 and 1G4 → 3F4, 3F2 → 3H6 were characterized using steady-state rate equations.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 82
·66807-66814
·
IF 3.84
Bin Zhou,Youfa Wang,Donglin Xia
Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ were successfully synthesized via the thermal decomposition of trifluoroacetate precursors using oleic acid and octadecylene as coordinating solvents. The up-conversion optical properties of the β-KYF4 nanocrystals with different lanthanide (Ln)-doped ions (Yb3+/Er3+, Yb3+/Tm3+) were investigated. It is found that the colloidal dispersion of β-KYF4:Yb,Er/Tm nanocrystals display strong multiple up-conversion emission spanning from the deep UV-to-NIR regions under 980 nm excitation. Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ can emit bright blue, green, yellow, and red emissions visible to the naked eye by adjusting the concentrations of Yb3+ sensitizer ion and Er3+ or Tm3+ activator ions. Moreover, the UC luminescent colors can be tuned for the four colors from blue to green to yellow and finally to red emission in the β-KYF4:X%Yb3+/(0.2%–2%)Er3+ and β-KYF4:25%Yb3+/0.2%Tm3+ colloidal samples. This work substantially expands our understanding of this category of KYF4 upconversion nanocrystals.
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
·
2020
·
IF 3.28
Xin Wang,Jibo Yu,Haiyan Zhao,Xiaosong Lu,Wenhao Li,Ke Tian,Gilberto Brambilla,Pengfei Wang
In this letter, high Q factor microsphere resonators with excellent stability and high damage threshold are fabricated from Tm 3+ doped fluorosilicate glasses using the traditional melt-quenching and fiber heating techniques. Intense 1.88 μm photoluminescence and single mode laser emission are obtained under the excitation of an 808 nm laser. The Q factor of the microsphere resonator is measured to be as high as 1.4 × 10 6 . Models for photoluminescence and lasing are proposed using spectroscopic data from the absorption and emission spectra . The excellent resistance to humidity and temperature are characterized from the transmittance spectra under different environmental conditions. Differential thermal analysis (DTA), measured in four different glass samples proves the high damage threshold. The proposed glass microsphere resonator laser can find application in optical sensors and micro lasers, especially in complex environments.
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Muyao Wang,Yanjie Zhang,Zeqing Hu,Jinghui Zhang
The single-phased white light-emitting Ca 4 (PO 4 ) 2 O: Tm 3+ , Tb 3+ , Eu 2+ phosphors with tunable color emission were synthesized by solid-state reaction method. The photoluminescence properties, crystal structure, decay time and cross-relaxation from Tm 3+ to Eu 2+ were investigated in detail. Under excitation of 352 nm, Tm 3+ singly doped Ca 4 (PO 4 ) 2 O (denoted as TTCP) phosphors exhibited an intense emission peak at 458 nm attributed to 1 D 2 → 3 F 4 transition of Tm 3+ ions and a broad emission peak in the range of 400–411 nm ascribed to oxygen vacancies in TTCP host. The emission intensity of oxygen vacancies decreases along with the increasing of Tm 3+ doping concentration due to the substitution of Ca 2+ and oxygen vacancies sites by Tm 3+ ions. For Tm 3+ and Eu 2+ co-doped TTCP phosphors, the blue emission intensity (458 nm) of Tm 3+ ions obviously decreased and the red emission intensity (624 nm) with of Eu 2+ ions increased due to Eu 2+ doping. The cross-relaxation from Tm 3+ to Eu 2+ ions was further demonstrated by the decay times of TTCP: 0.03 Tm 3+ , yEu 2+ phosphors monitoring the emission peak at 458 nm. Further, Tb 3+ ions were also introduced in the TTCP phosphor for a green emission and Tb 3+ singly-doped TTCP phosphor displays the emission peaks at 488 nm and 545 nm due to the typical 5 D 4 → 7 F 5 and 5 D 4 → 7 F 5 transition of Tb 3+ ions, respectively. Finally, TTCP: Tm 3+ , Tb 3+ , Eu 2+ phosphor was obtained and emitted the white light with the blue (458 nm), green (545 nm), and red (603 nm) emission bands under excitation of 352 nm. Especially, white light with tunable color temperature (3000 K–6000 K) and high color rendering index (Ra > 90) can be easily acquired. A neutral white light with high color rendering index (Ra 91.1) can be achieved for the TTCP: 0.03 Tm 3+ , 0.25 Tb 3+ , 0.004Eu 2+ phosphor.
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
·
2021
·
IF 3.08
Yuchao Shi,Jing Li,Wenhao Cui,Yaru Peng,Yuxin Huang,Li Chen
Monodisperse In 2 O 3 : Yb 3+ /Er 3+ upconverting nanoparticles (UCNPs) were firstly synthesized via solvothermal method in three-neck round-bottom flask. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier-transform infrared spectroscopy (FTIR) methods are used to characterize the prepared UCNPs. The size of monodisperse spheroid nanoparticles prepared can be controllable in 31 nm. The sample exhibits stronger upconversion luminescence (UCL) than reported In 2 O 3 : Yb 3+ /Er 3+ UCNPs with similar size. Furthermore, the obtained In 2 O 3 UCNPs, by coating the SiO 2 protecting layer, display fine stability. Simultaneously, the UCL properties and possible energy transfer process of In 2 O 3 : Yb 3+ /Ho 3+ and In 2 O 3 : Yb 3+ /Tm 3+ NPs have also been investigated by the spectra distribution and power dependence. The results indicate Yb 3+ /Er 3+ , Yb 3+ /Ho 3+ and Yb 3+ /Tm 3+ codoped In 2 O 3 UCNPs is a probable oxide upconverting material with small size and intense UCL for biological applications.
研究领域:
材料科学
·
光学
·
生物医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Defu Xu,Xiao Xiao,Qiang Fan
The development of multi-mode self-calibrated photothermal thermometers for high-temperature applications is critically needed. However, most existing strategies are limited by single mode and severe thermal quenching. To address this, activator Er 3+ , Tm 3+ , and sensitizer Yb 3+ co-doped Y 2 W 3 O 12 (YWO) negative thermal expansion (NTE) phosphors have been developed, which exhibit effective resistance to thermal quenching in the up-conversion luminescence under 980 nm excitation. Moreover, an abnormal 3-photon-dominated up-conversion process was observed in YWO:18Yb/2Er/0.5Tm powder, attributed to the cross-relaxation (CR) between Er 3+ and energy transfer (ET) from Er 3+ to Tm 3+ . In addition, benefiting from the effect of NTE and the limited ET process in YWO:18Yb/2Er/0.5Tm, the relative intensity of the temperature-dependent up-conversion from the 2 H 11/2 , 4 S 3/2 , and 1 G 4 level, as well as their state splitting luminescence, exhibit distinct disparities. Furthermore, based on the luminescence intensity ratio (LIR) technique, a four mode self-calibrated optical thermometer using YWO:18Yb/2Er/0.5Tm powder is designed. The thermometer exhibits acceptable sensitivity, with absolute sensitivity ( S a) and relative sensitivity ( S r) reaching 0.006 K -1 at 293 K and 0.26% K -1 at 543 K, respectively. The developed thermometer could provide a reference for self-calibration, and its wide spectral operating range ensures the reliability of temperature sensing, which has the potential to be used in some high-temperature conditions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Chen Zhang,Chuan Ding,Mingyue Li,Jinyang Zhou,Tao Yuan,Zhemin Shen
The infrared energy of the sun’s rays accounts for more than 40 %. Heterostructures were constructed to enable broad-spectrum response of photocatalysts, and enhance the utilization of sunlight, especially that of infrared lights. A robust heterostructured upconversion composite material decorated with Ag nanoparticles (AgNPs), β-NaLuF 4 @ NaLuF 4 :Yb 3+ ,Tm 3+ @ AgNPs@BiOBr (NLF@NLFT@Ag@Bi), was built through a multi-step hydrothermal method. NLF@NLFT@Ag@Bi demonstrates enhanced photocatalytic activity under UV–Vis-NIR, Vis-NIR, and NIR irradiation compared to pure BiOBr and NLF@NLFT@Ag/BiOBr mixture, achieving 99 % Rhodamine B (RhB) degradation in 0.5 h (UV–Vis-NIR) and 96 % in 3 h (NIR), with degradation over 80 % for Bisphenol A (BPA), Norfloxacin (Nor), and Methyl Orange (MO) in 3 h (UV–Vis-NIR). The upconversion luminescence (UCL) of NLF@NLFT@Ag is tuned by its core–shell structure and AgNPs’ plasmonic effect, while NLF@NLFT@Ag@Bi’s enhanced photocatalysis arises from boosted UCL and AgNPs-facilitated Förster resonance energy transfer (FRET) between NLFT and BiOBr. The material’s efficacy in infrared-driven photocatalysis offers a prospective approach for extending catalyst response ranges. It greatly enhances degradation effects of organic pollutants under sun’s rays.
✓ 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）