SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Yichen Jin,Tao Pang
Upconversion luminescence and optical temperature sensing properties of Yb 3+ /Er 3+ /Li + tri-doped ZnMoO 4 phosphors were investigated. It has been demonstrated that Li + doping affected not only the local symmetry of Yb 3+ and Er 3+ but also the distribution of them in the host lattice. As a result, the significantly improved green upconversion luminescence was obtained when excited at 980 nm. The pumping power dependent photo-thermal behavior was used to evaluate the reliability of upconversion temperature sensing. An accurate temperature scale was established by eliminating the impact of thermal effect, and the sensing ability was evaluated via a comparison with the results reported in literatures.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2018
·
IF 2.732
Zengchao Yu,Xiaoxiao Li,Xin Wang,Yanmin Yang
In this paper, Yb 3+ /Er 3+ , Yb 3+ /Tm 3+ and Yb 3+ /Er 3+ /Tm 3+ co-doped β -NaYF 4 up-conversion fluorescent nanoparticles (UCNPs) with an average diameter of 50 nm were successfully synthesized through a thermal decomposition method. The Yb 3+ /Er 3+ co-doped UCNPs possess bright and tunable luminescence varying from green to red as the ratio of Yb 3+ and Er 3+ doping increases. Remarkably, white up-conversion luminescence can be successfully achieved through the incorporation of Tm 3+ . The white light up-conversion efficiency of Yb 3+ /Er 3+ /Tm 3+ co-doped UCNPs dispersed in the solvent have been calculated, suggesting the potentials of the efficient white up-conversion emissions for the multispectral imaging and potential bio-applications.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Jun Liu,Huawei Deng,Fengzhen Lv,Wenjie Kong,Dihu Chen,Fuchi Liu,Lizhen Long
The large number of energy levels available to lanthanide ions makes the emission mechanism of lanthanide-doped luminescent materials extremely complicated. Herein, we focus on the discussion and analysis of luminescence manipulation in Gd 2 O 3 :Yb 3+ /Er 3+ nanocrystals and systematically investigate ion-ion interaction–induced energy transfer in up- and downconversion processes to shed light on the manipulation mechanism, showing that the luminescence of the above nanocrystals can be controlled by varying the content of Yb 3+ . Based on Dexter's energy transfer theory and the fact that excitation of Er 3+ ions results in the appearance of emission attributed to the 2 F 5/2 → 2 F 7/2 transition of Yb 3+ in the near-infrared region (950–1100 nm), this behavior is ascribed to the occurrence of energy transfer from Er 3+ to Yb 3+ .
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Wei Xu,Yuwei Hu,Longjiang Zheng,Zhiguo Zhang,Wenwu Cao
Optical temperature sensors based on rare earth ions activated luminescent materials have presented their capabilities in thermal reading with good stability and high spatial resolution. The ongoing challenge is to improve the luminescence for further enhancing temperature measurement sensitivity and accuracy. Here, several Er 3+ -Yb 3+ codoped CaWO 4 phosphors are prepared and Cr 3+ ions are introduced, trying to modify the upconverion (UC) emissions from Er 3+ ions. Under the excitation of 980 nm laser, green UC luminescence from 2 H 11/2 and 4 S 3/2 states of Er 3+ is successfully strengthened with Cr 3+ codoping. Through the analysis of characterization by scanning electron microscopy, X-ray diffraction, Raman spectroscopy , and time-resolved spectroscopy, it is found that the dopant of Cr 3+ ions could affect the crystallinity and distort the crystal structure of the as-prepared samples. The thermometry behavior based on green emissions of Er 3+ is studied via fluorescence intensity ratio method. It is interesting to observe that the temperature sensing performance has also been influenced by the incorporation of Cr 3+ . When introducing 9 mol% Cr 3+ ions into Er 3+ -Yb 3+ codoped CaWO 4 phosphors, a maximum sensitivity of about 1.91% K −1 has been achieved. Combined with the intense green luminescence, CaWO 4 : Er 3+ -Yb 3+ -Cr 3+ would be a promising candidate for optical thermometry with excellent measurement sensitivity and accuracy.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
·
IF 3.995
Xiangyan Yun,Jun Zhou,Yaohui Zhu,Xiong Li,Shan Liu,Chen Fang,Mingxia Lv,Denghui Xu
Up-conversion fluorescent materials serve a significant function as the detection materials of temperature sensors . In this study, a series of green-emitting LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors applied in optical temperature sensing detection were successfully synthesized via the solid-state process in air. The crystal structure, luminescence properties, luminescence mechanism, and optical temperature sensing properties of samples were investigated. LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphor with excitation at 980 nm emits pronounced green emissions owing to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. The whole emission processes of LiLu 0.72 W 2 O 8 :0.24 Yb 3+ , 0.04Er 3+ sample are all two-photon processes. Moreover, we apply thermal coupling levels ( 2 H 11/2 , 4 S 3/2 ) for temperature sensing and the value of sensing sensitivity can reach the maximum of about 1.41% K −1 . All the experimental results imply that LiLuW 2 O 8 :Yb 3+ , Er 3+ phosphors show good potential in temperature sensing.
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高影响因子
JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Fei Men,Baosheng Cao,Yan Cong,Yangyang He,Zhenyi Zhang,Zhiqing Feng,Bin Dong
In this paper, we report the thermal-enhanced near-infrared upconversion luminescence (UCL) from thermal-coupled (TC) energy levels of Er 3+ and a new optical temperature sensing strategy in Er 3+ -doped phosphors. The near-infrared UCL of Er 3+ in the wavelength range of 750–900 nm due to the transitions from the 2 H 11/2 and 4 S 3/2 TC energy levels to the 4 I 13/2 metastable energy level showed a thermally enhanced luminescence behavior at elevated temperatures that is related to the enhanced temperature-dependent non-radiative relaxation. The luminescence intensity ratio (LIR) between the near-infrared ( 2 H 11/2 / 4 S 3/2 → 4 I 13/2 ) and the green ( 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ) UCL of Er 3+ was studied as a function of temperature and demonstrated good optical thermometry behavior based on the classic Boltzmann distribution . The absolute sensitivity based on the LIR between near-infrared and green UCL of Er 3+ was as high as 0.061 K −1 , showing a nearly two orders of magnitude improvement compared to that based on the traditional LIR between two green UCL of Er 3+ . It is anticipated that the near-infrared UCL from TC energy levels of Er 3+ can be used to construct new luminescent thermometry devices with high sensitivity, low temperature uncertainty, and good repeatability.
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高影响因子
Journal of Advanced Ceramics
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2020
·Vol. 9
·期 6
·693-702
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IF 2.889
Xu Jie,Lu Qiling,Lin Jinfeng,Lin Cong,Zheng Xinghua,Lin Tengfei,Wu Xiao
Er 3+ -doped Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 ( x Er-BCTZ, x = 0, 0.005, 0.01, 0.015) multifunctional thick films were prepared by the tape-casting method, using sol-gel-derived nano-sized powders as the matrix material. The surface morphologies, photoluminescence, and electrical properties were investigated. Dense microstructures with pure perovskite structure were obtained in the thick films. By doping an appropriate amount of Er 3− , the samples exhibit superior up-conversion photoluminescence performance and simultaneously enhanced electrical performances. In addition, relatively higher texture fractions (with the largest value of 83.5%) were realized through introducing plate-like BaTiO 3 templates to make the thick film grow by the [001] c orientation. And the ferro-/piezoelectric properties of the thick films were further improved, showing potential in the applications of micro-optoelectronic devices.
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高影响因子
Optical Materials Express
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2017
·Vol. 7
·期 8
·3003-3010
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IF 2.591
Hui Li,Yundong Zhang,Lin Shao,ZinMaung Htwe,Pin Yuan
High sensing sensitivity and accuracy is valuable for optical temperature sensors in practical applications. Er3+/Yb3+ co-doped BaZrO3 ceramics were prepared by the dry pressing method. The upconversion luminescence of Er3+/Yb3+ co-doped BaZrO3 ceramics was studied at a temperature range from 300 to 500 K under different pump power. The ratio of non-thermal coupling levels of 4S3/2, 4I9/2→4I15/2 (I546/I875), and 4F9/2, 4I9/2→4I15/2 (I658/I875) show a linear relationship as the temperature increased. The maximum relative sensitivity was estimated to be 1.39% K−1 at 500 K under 90 mW pump power. The result indicated that the BaZrO3:Er3+/Yb3+ ceramic is a promising candidate for high temperature sensing applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 5
·2673-2683
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IF 2.302
Huang Zhangyu,Yi Mengji,Gao Huiping,Zhang Zhenlong,Mao Yanli
A strategy is demonstrated for simultaneous size and color tuning of KZnF 3 :Yb 3+ /Er 3+ nanocrystals through transition metal Mn 2+ doping. The experimental results indicate that the introduction of Mn 2+ into the KZnF 3 :Yb 3+ /Er 3+ reaction system facilitates the decrease of the crystal size. Moreover, in the case of a high concentration of Mn 2+ doping, the downshifting (DS) and upconversion (UC) luminescence all show a single red band emission. In this work, we mainly investigate the DS and UC energy transfer process among Mn 2+ /Yb 3+ /Er 3+ in KZnF 3 nanocrystals by the detection and analysis of the absorption, excitation, emission, and transient fluorescence spectra. The results show that both Mn 2+ and Yb 3+ ions can decrease the green emission while improving the red luminescence of Er 3+ . This DS and UC single red color tuning is significant for the application of nanoparticles in light conversion, biological labeling, or plant photosynthesis.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 103
·101707-101713
·
IF 3.289
Shengjun Zhang,Jiajia Zhou,Ruozhen Wu,Lei Lei,Zhen Xiao,Junjie Zhang,Shiqing Xu
Lanthanide (Ln3+)-doped nanoparticles that produce strong red upconversion (UC) luminescence are desirable for biological applications. For nanoparticles, modification of their electronic properties and stabilization of their crystallographic phase are crucial for tuning their luminescence behaviors. Here, Yb3+–Er3+ doped Gd2O3 nanoparticles have been synthesized by calcining Gd2O2S in nitrogen (O2-free) and ambient air (∼21% O2), respectively. Various approaches including X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy and thermo-gravimetric and differential thermal analyses (TG-DTA) were used to characterize the structure, morphology and phase formation mechanism of the nanoparticles. Upconversion luminescence properties were investigated by emission intensity vs. excitation power (double logarithmic relationship) and temperature dependent emission spectroscopy. The different splitting transition probabilities of the cubic and/or monoclinic phase, the probability of multiphonon relaxations and cross relaxations between Er3+ ions are responsible for the efficient red emission in the cubic Gd2O3 nanoparticles. More importantly, the lower phonon energy of the pure cubic sample has good thermal stability in the current detectable range of 20–100 °C. These results imply that the cubic Gd2O3 upconversion nanoparticles may have multiplexing functionality in bio-imaging.
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高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Jia Yu,Ruipeng Chai,Yuanyuan Hu,Xue Yang,Hong Xin,Xiangyu Zhang,Dangli Gao
Persistent luminescence (PersL) materials have emerged as an outstanding optical media with versatile applications in data storage, anti-counterfeiting, and beyond. However, their practical implementation is critically hindered by insufficient PersL intensity, a challenge fundamentally rooted in the incomplete understanding of trapping mechanisms. Here, we developed Tb 3+ -activated Ga 4 GeO 8 phosphors with rational defect manipulation via Ln 3+ (Ln = Pr, Eu, Ce, Er) co-doping strategies. Especially, when Eu 3+ /Er 3+ are introduced as lattice distortion agents into Tb 3+ -doped Ga 4 GeO 8 , the phosphors demonstrate dual-band PersL including blue-green PersL from Tb 3+ 5 D 4 → 7 F J transitions (492–620 nm) and red-NIR PersL emission (715 nm) originating from oxygen defect levels. Through systematic exploration of the PersL mechanism, we propose a criterion for effective trapping: stabilizing V O •• defect energy levels by replacing matrix cations with less electronegative species (e.g., Eu 3+ , Er 3+ ), which suppresses non-radiative V O defect states. This study establishes design guidelines for the rational development of high-performance PersL materials.
研究领域:
材料科学
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光学材料
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固体物理
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无机化学
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发光学
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高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Jiaqi Zhao,Zheng Fu,Kejie Li,Mengmeng Dai,Zhiying Wang,Guiying Liang,Yanling Wei,Zuoling Fu
The growing demand for efficient and sustainable photonic materials has spurred significant interest in eco-friendly lead-free double perovskites, which exhibit exceptional photoluminescence properties for next-generation sensing and display technologies. However, the emission performance of the material is limited by multiphonon relaxation, which leads to low energy efficiency under complex operating conditions. In this study, the 3H5 energy level of Tm3+ is strategically engineered as an energy bridge within lead-free double perovskites, effectively overcoming the constraints imposed by inefficient multiphonon relaxation in Er3+ (4I11/2 → 4I13/2). This targeted modulation of energy transfer pathways results in a significant 50-fold enhancement in the red-to-green (R/G) emission ratio of Er3+, increasing from 0.09 to 4.58, accompanied by a pronounced chromaticity shift from green (0.278, 0.709) to red (0.678, 0.320). This tunable emission behavior is further modulated by laser power density and excitation wavelength (808 or 980 nm). Moreover, Gd2MgTiO6 (GMTO):Er3+,Tm3+ demonstrates excellent temperature-measuring ability based on the luminescence intensity ratio (2H11/2/4F9/2 → 4I15/2), achieving a maximum relative sensitivity of 1.03% K−1 at 313 K. This work not only demonstrates a generalizable strategy to suppress multiphonon relaxation via lanthanide energy bridges but also paves the way for multifunctional photonic devices tailored to emerging applications in smart sensing, secure communication, and next-generation optoelectronics.
研究领域:
材料科学
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光子学
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稀土发光
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固态物理
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传感器技术
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纳米光学
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功能材料
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高影响因子
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