Journal of Materials Chemistry C
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2017
·Vol. 5
·期 25
·6311-6318
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IF 5.256
Xia Xu,Xuesong Zhai,Kaimin Du,Pengpeng Lei,Lile Dong,Ruiping Deng,Jing Feng,Hongjie Zhang
Impurity doping has a significant influence on the nucleation and growth of nanocrystals. The influence of the ionic radius of the dopant and grain size on the crystallographic phase of KLu2F7:Yb3+/Er3+ nanocrystals has not been systematically investigated. Herein, we demonstrate an M ion (M = Mn2+, Gd3+, Nd3+) doping approach to dynamically fine-tune the grain size of KLu2F7:Yb3+/Er3+ nanocrystals, and study the influence of the ionic radius of the doping M ions and particle size reduction on the crystallographic phase. Through a comprehensive investigation of the impurity doping induced phase transition phenomenon and the growth mechanism of KLu2F7:Yb3+/Er3+ nanocrystals, we speculated that the impurity doping induced phase transition mechanism of KLu2F7:Yb3+/Er3+ mainly depends on the grain size of nanocrystals ignoring the ionic radius of the dopant. With the decrease of the grain size, high surface tension triggers phase transformation from anisotropic (orthorhombic KLu2F7:Yb3+/Er3+) to isotropic (cubic KLu3F10:Yb3+/Er3+). What is more, we have systematically investigated the visible (VIS)-upconversion and near infrared (NIR)-downshifting emission of various-sized KLu2F7:Yb3+/Er3+ UCNPs and Mn2+, Gd3+ or Nd3+ ion doped KLu2F7:Yb3+/Er3+ UCNPs. The findings provide keen insights into understanding the effect of size reduction on the phase transition mechanism and the photoluminescence properties of KLu2F7:Yb3+/Er3+ UCNPs, while offering the possibility for good academic studies and application prospects.
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RSC Advances
·
2017
·Vol. 7
·期 61
·38506-38511
·
IF 3.108
Haiyong Guo,Zhen Hu,Li Zhao,Li Wan,Yadan Wu,Shimin Wang
A new strategy to improve the efficiency of dye-sensitized solar cells by using the external near-infrared light harvesting and light-scattering dual-functional upconversion (UC) material NaLuF4:Yb3+/Er3+ is proposed. The photoluminescence spectra of NaLuF4:Yb3+/Er3+ showed the emission of green and red light, and these luminescence bands coincided well with the absorption wavelength of N719 dye. A small amount of UC material could serve as a good scattering material in photoelectrodes. The photoelectric conversion efficiency reaches 7.58% at a concentration of 5 wt% of UC (weight ratio of UC to TiO2), which is 27.18% higher than that of P25 photoanode (5.96%) with similar thickness. This finding may be attributed to the UC luminescence and light scattering properties of the UC material.
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JOURNAL OF FLUORESCENCE
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2017
·Vol. 28
·期 1
·285-291
·
IF 1.461
Cheng Yuan,Sun Kangning
Yb 3+ ,Er 3+ ,Eu 3+ triply-doped in YVO 4 with varying molar ratio of Er/Eu were synthesized in a sol–gel method with a subsequent heat treatment for the first time. The optimal molar ratio of Er/Eu for the maximum energy transfer efficiency was 1/39. After molar ratio, the influences of different heat treatment temperatures were also researched and the maximal heat temperature was 1300 °C. Besides, the properties of YVO 4 :Yb 3+ ,Er 3+ ,Eu 3+ upconversion phosphors were investigated by X-ray diffraction, scanning electron microscopy and photo luminescent spectra, respectively. In sum, XRD results indicate the crystal structure of as-prepared samples, which is the tetragonal phase of YVO 4 with no other diffraction peaks. SEM images show the morphology of as-prepared samples, which are granular-like nanoparticles. PL spectra demonstrate the upconversion luminescence of as-prepared samples, which emit strong green lights (at 525 nm, 550 nm) and slight red lights (at 590 nm, 615 nm, 695 nm) under the NIR irradiation at 980 nm. Two strong green emissions are attributed to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. Meanwhile, three slight red emissions are attributed to the 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 and 5 D 0 → 7 F 4 transitions of Eu 3+ ions. All in all, the colorful emissions endow YVO 4 :Yb 3+ ,Er 3+ ,Eu 3+ phosphors great potential for some applications, such as display devices, bio-labeling and infrared detection.
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PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 107
·62802-62808
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IF 3.708
Yan Song,Guixia Liu,Xiangting Dong,Jinxian Wang,Wensheng Yu,Jingmei Li
Bifunctional hybrid nanocomposites based on upconversion luminescence and photothermal properties have a wide range of application, especially biomedical diagnosis and therapy. Herein, the hybrid nanocomposites were prepared via combining NaYF4:Yb3+,Er3+/Ho3+ nanocrystals as shell layer materials and Au nanoparticles as the cores. The as-prepared nanocomposites can simultaneously take advantage of both the upconversion luminescence of NaYF4:Yb3+,Er3+/Ho3+ nanocrystals and the photothermal transduction property of Au nanoparticles. The structure, morphology and composition of the nanocomposites were confirmed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). In addition, the upconversion luminescence and photothermal transduction were evaluated. We observed an overlap between the absorption band of Au nanoparticles and the upconversion emission peaks of the Er3+/Ho3+ ions, and the luminescence resonance energy transfer (LRET) was studied and demonstrated. Under 980 nm laser irradiation, upconversion luminescence and efficient photothermal transduction of the hybrid nanocomposites were found. Moreover, the bifunctional nanocomposites also have shown excellent biocompatibility.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Yan Shaohan,Wang Lijing,Shan Pengnian,Lin Xue,Shi Weilong
Against the backdrop of increasing energy shortages, hydrogen energy has garnered significant attention as a green and clean alternative energy source. To fully exploit a broader portion of the solar spectrum, we designed a Y 2 O 3 :Yb 3+ , Er 3+ /ZnIn 2 S 4 (denoted as YYE/ZIS) composite photocatalyst with a well-defined loaded structure of coating Y 2 O 3 :Yb 3+ , Er 3+ nanoparticles on the ZnIn2S4 micro-flowers, capable of efficiently utilizing near-infrared (NIR) light through an up-conversion mechanism. The introduction of Yb 3+ and Er 3+ ions endows the Y 2 O 3 with excellent up-conversion luminescence properties, enabling the effective conversion of lowenergy NIR photons into high-energy visible light over YYE/ZIS composite, which subsequently activates the ZIS component for NIR-driven photocatalytic hydrogen production. Photoelectrochemical characterizations reveal that the loaded structure significantly facilitates efficient charge separation and migration at the interface, while markedly suppressing the recombination of photogenerated electron-hole pairs, thereby enhancing the overall photocatalytic performance. Remarkably, the catalyst demonstrates excellent NIR-response hydrogen evolution performance (16.3 μmol·g -1 ·h -1 ) even in the absence of noble metal co-catalysts, such as Pt, achieving a hydrogen production rate approximately 10.9 times higher than that of pristine ZIS. This work proposes a novel approach for constructing up-conversion-enabled composite photocatalysts with rationally engineered interfacial architectures.
研究领域:
材料科学
·
能源化学
·
纳米技术
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JOURNAL OF SOLID STATE CHEMISTRY
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2020
·
IF 2.726
Hao Tang,Ying Xu,Xianhua Cheng
In this study, Cr 3+ and Mg 2+ co-doped β-NaYF 4 :Yb 3+ /Er 3+ (NYFYE) microcrystals were synthesized for the first time by the facile hydrothermal method . Cr 3+ and Mg 2+ co-doping was confirmed to influence the structure, morphology and UCL property of NYFYE microcrystals. The growth mechanism of NYFYE microcrystals doped with different Cr 3+ and Mg 2+ was discussed in detail. With 16 mol% Cr 3+ and 4 mol% Mg 2+ co-doping into NYFYE, the UC emissions were enhanced to 7 times (green) and 4 times (red) higher than those of the undoped counterpart, and the mechanism was explored by considering the different roles of Cr 3+ and Mg 2+ , the surface quenching and concentration quenching effects. This finding suggests the co-doping of two different impurity ions may be a better approach than corresponding single impurity ion doping for morphology control and UCL intensity enhancement, which is instructive for high performance UC crystals design.
研究领域:
材料科学
·
光学
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高影响因子
DYES AND PIGMENTS
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2018
·
IF 3.767
Peng Li,Linna Guo,Zongxue Zhang,Tiesheng Li,Penglei Chen
A series of Bi 2 O 3 :Yb 3+ /Er 3+ phosphors with different phases and morphologies were obtained by tuning doping ions, which played a vital role in the upconversion luminescence (UCL). Both Er 3+ single doped and Yb 3+ /Er 3+ co-doped samples exhibit narrow, nearly pure red emission whether excited by 980 nm or 1550 nm. Compared to the sum of emission intensities excited by two single-wavelength (980 nm and 1550 nm) separately, the red emission from Bi 2 O 3 :Yb 3+ /Er 3+ with uneven distributed nanometer or micron blocky particles structure excited by two-wavelength simultaneously was enhanced by a factor of 2.41. To further improve the UCL intensity, optical-inert ions such as Na + , Ca 2+ and Gd 3+ were doped into this system. Compared to the optical-inert ions free sample (Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ ), the pure red UCL in Bi 2 O 3 :15% Yb 3+ , 2% Er 3+ with 6% Na + , 2% Ca 2+ and 4% Gd 3+ doping is enhanced by 223.83 or 203.73 times under 980 or 1550 nm excitation, respectively. Meanwhile, the UCL mechanism under the multiwavelength was investigated in detail and its model of UC emission process was proposed.
研究领域:
材料科学
·
光学
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高影响因子
OPTICAL MATERIALS
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2022
·
IF 3.754
Tingxia Wu,Ying Hong,Lingyu Song,Yongbao Zhu,Jinling Wang,Yuanyuan Zhu,Jing Fang,Guosong Chen
Smuggling has caused serious adverse effects on the global market and national security, among which drug smuggling is increasingly rampant. Thus, the development of high-tech security strategies has become an urgent challenge for customs supervision. Recently, lanthanide ions (Ln 3+ ) doped upconversion nanoparticles (UCNPs) have opened up new ways for security and anti-fake applications due to their unique optical properties under near-infrared excitation. Here, we propose a novel upconversion microcrystal composed of hexagonal phase NaYF 4 :Ln 3+ capped by sodium hexametaphosphate (SHMP), successfully used in customs supervision. The addition of SHMP can not only regulate the morphology of microcrystals, but also significantly improve the luminescence properties of UC. The absolute quantum yield is up to 7% at the low power density of 30 W∙cm −2 , above most currently reported levels. Without adding any organic additives, the precise control of particle phase and morphology (e.g., microrod, hexagonal prism and hollow sphere) would be achieved by adjusting the doping ratio of SHMP/Ln 3+ . As the reaction time extends, the morphology of NaYF 4 :Ln 3+ changes from ellipsoid to microrod, while cubic phase transforms into hexagonal phase. Under the excitation of 980 nm laser, the green upconversion emission of hexagonal NaYF 4 :Ln 3+ microrods is significantly strengthened, which is more powerful than other observed particles with other shapes. This strong upconversion emission that depends on morphology and phase has huge application potential in security anti-counterfeiting and photonic devices .
研究领域:
材料科学
·
光学
·
化学
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高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 9
·094001
·
IF 3.404
Zengliang Shi,Yue Duan,Xingjun Zhu,Qiwei Wang,DongDong Li,Ke Hu,Wei Feng,Fuyou Li,Chunxiang Xu
Lanthanide-doped up-conversion nanoparticles (UCNPs) provide a remote temperature sensing approach to monitoring biological microenvironments. In this research, the UCNPs of NaYF4:Yb3+, Er3+@NaYF4:Yb3+, Nd3+ with hexagonal (β)-phase were synthesized and applied in cell temperature sensing as well as imaging after surface modification with meso-2, 3-dimercaptosuccinic acid. In the core–shell UCNPs, Yb3+ ions were introduced as energy transfer media between sensitizers of Nd3+ and activators of Er3+ to improve Er3+emission and prevent their quenching behavior due to multiple energy levels of Nd3+. Under the excitations of 808 nm and 980 nm lasers, the NaYF4:Yb3+, Er3+@NaYF4:Yb3+, Nd3+ nanoparticles exhibited an efficient green band with two emission peaks at 525 nm and 545 nm, respectively, which originated from the transitions of 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 for Er3+ ions. We demonstrate that an occurrence of good logarithmic linearity exists between the intensity ratio of these two emission peaks and the reciprocal of the inside or outside temperature of NIH-3T3 cells. A better thermal stability is proved through temperature-dependent spectra with a heating–cooling cycle. The obtained viability of NIH-3T3 cells is greater than 90% after incubations of about 12 and 24 (h), and they possess a lower cytotoxicity of UCNPs. This work provides a method for monitoring the cell temperature and its living state from multiple dimensions including temperature response, cell images and visual up-conversion fluorescent color.
研究领域:
纳米技术
·
生物物理学
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细胞生物学
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材料科学
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qiyao Guo,Jihuai Wu,Yuqian Yang,Xuping Liu,Jinbiao Jia,Jia Dong,Zhang Lan,Jianming Lin,Miaoliang Huang,Yuelin Wei,Yunfang Huang
The introduction of upconversion materials as spectral converter into photovoltaic devices to harvest and convert near infrared photons to visible photons that can thus be absorbed by perovskite layer is a promising strategy for enhancing the performance of perovskite solar cells . Hence, β-NaYF 4 :Yb 3+ /Er 3+ /Sc 3+ @NaYF 4 rare-earth doped upconversion nanoparticles with core-shell structure are synthesized. The doped rare-earth ions Yb 3+ and Er 3+ convert near infrared light to red and green light, and the Sc 3+ ions enhance the upconversion luminescence efficiency, which broaden the absorption range of solar irradiation and generate extra photocurrent in the solar cells. The surface defects of β-NaYF 4 :Yb 3+ /Er 3+ /Sc 3+ is passivated by the even NaYF 4 shell, which results in the obvious enhancement in upconversion emission intensity. Consequently, the perovskite solar cell based on the rare-earth doped upconversion nanoparticle mesoporous layer achieves a high power conversion efficiency of 20.19%, while the device based on TiO 2 mesoporous layer gets an efficiency of 17.44%.
研究领域:
材料科学
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能源科学
·
光学工程
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Di Wu,Yuting Wu,Qi Wang,Zhiling Guo,Xinyue Yang,Zhangwen Long,Dacheng Zhou,Jingchang Lin,Tao Han,Jianbei Qiu
Rare-earth (RE)-doped upconversion luminescence (UCL) materials are essential for advanced optoelectronic technologies, yet their performance is severely compromised by thermal quenching (TQ) at elevated temperatures, hindering practical deployment in high-temperature environments. In this study, we introduce a defect-mediated strategy to achieve thermally enhanced UCL in Yb 3+ /Er 3+ co-doped Cs 2 NaBiCl 6 double perovskites, focusing on the dynamic behavior of chloride vacancy-related centers (V Cl -related centers) and their possible role in modulating energy transfer between RE ions. By systematically tuning V Cl -related centers relative abundance through different processing routes and LiCl doping, we establish data-consistent mechanistic interpretation and a clear correlative relationship between defect-related states and the thermal enhancement of UCL emission. The ground sample, characterized by high defect density, exhibits a 2.1-fold increase in UCL intensity at 573 K compared to room temperature. With moderate LiCl doping (5%), the thermal enhancement factor increases to 5.9-fold—nearly three times greater than that of the undoped ground counterpart. Using electron paramagnetic resonance (EPR), Hall effect measurements, and fluorescence lifetime analysis, we show that defect-related states associated with V Cl are consistent with non-radiative trapping centers affecting the Yb 3+ -sensitized upconversion pathway under ambient conditions. Upon heating, the combined results are consistent with a thermally activated reconfiguration of the defect landscape, plausibly involving partial compensation or transformation of V Cl -related centers by mobile chlorine-related species, thereby suppressing non-radiative pathways and enhancing Yb 3+ →Er 3+ energy transfer efficiency. Critically, singly Er 3+ -doped samples show negligible thermal enhancement, confirming that the observed effect specifically targets Yb 3+ sensitizers rather than Er 3+ activators. This work provides a data-supported working model for thermally enhanced UCL in halide double perovskites and establishes a general defect-engineering approach for designing RE-doped UCL materials with superior resistance to thermal quenching. These advances open new avenues for applying such materials in extreme-environment optoelectronic devices, including high-temperature optical sensors and NIR-driven light sources.
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高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Junwei Zhang,Hui Lin,Yang Tang,Ruijin Hong,Zhaoxia Han,Changyu Lu,Dawei Zhang,Jianren Xu
Inorganic luminescent materials play a critical role in the fields of multimodal anti-counterfeiting. Although integrating multiple luminescence modes into a single matrix is considered a feasible strategy, it still faces significant challenges such as the regulation and identification of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ ,Yb 3+ ,Er 3+ phosphors integrating multiple luminescence modes, including afterglow, up-conversion luminescence (UCL), photo-stimulated luminescence (PSL), and thermoluminescence (TL) were developed. Importantly, the introduction of the Yb 3+ /Er 3+ ion pair not only suppresses the concentration of shallow traps but also induces the formation of numerous deep traps (1.62 eV), which are essential for multimodal luminescence and enhance the thermal stability of the luminescence. Furthermore, through comprehensive analysis of density functional theory (DFT) calculation, TL curves, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), it is confirmed that the trap levels primarily originate from oxygen vacancies and interstitial aluminum. Finally, a highly stable flexible film was fabricated, whose emission intensity and color can be controlled by external light/thermal stimuli, and its applications in anti-counterfeiting and information encryption are demonstrated. This work facilitates the research on advanced luminescent materials and traps regulation mechanisms.
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