JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yingjie Zhao,Zewen Su,Youqiang Huang,Yuan Liu,Shiqing Xu,Gongxun Bai
The dual-functional optical materials that can achieve accurate temperature sensing and effective photothermal conversion have aroused great concern in biomedical and industrial fields. However, the lack of optical functional materials limits the photothermal devices in practical applications. In this work, the pure monoclinic Ho 3+ /Yb 3+ codoped La 2 Ti 2 O 7 microcrystals have been successfully synthesized for optical thermometry and photothermal conversion. Different from the partial overlap of thermal coupling energy levels in Er 3+ , the wide separation of emission bands in Ho 3+ reduce the calculation error of ratio-metric thermometry. The maximum value of sensitivity reaches 1.41% K −1 . And the light-to-heat energy conversion of the sample has been explored by some photothermal experiments. It is confirmed that the sample can be heated to the specified temperature by adjusting the power of the heating light source. Meanwhile, the photothermal imaging can be achieved because of the high photothermal conversion of the material. Besides, the dual-functional prototype probe based on La 2 Ti 2 O 7 :Ho 3+ /Yb 3+ microcrystals has been made to investigate the temperature sensing and photothermal conversion performance. These results illustrated the sample has potential applications in optical thermometry and biological photothermal therapy.
研究领域:
材料科学
·
生物医学
✓ 已验证
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Yanting Liu,Qiumei Li,Lili Meng,Qi Pang,Yanzhu Wang,Hua Yao,Qian Chen
The emergence of near-infrared (NIR) luminescence from lanthanide (Ln 3+ ) ions doped lead-free Cs 2 AgInCl 6 double perovskites (DPs) has garnered significant attention due to its extensive range of potential applications. Unfortunately, they still suffer from weak NIR emission due to the inherent wide band gap of DPs resulting in inefficient energy transfer from the host to Ln 3+ . Herein, Bi 3+ can act as the sensitizer to activate Ho 3+ emission and reduce the excitation energy in Cs 2 AgInCl 6 : Ho. Under 400 nm excitation, Bi 3+ co-doped Cs 2 AgInCl 6 : Ho shows 39 times and 21 times higher emission intensity than Cs 2 AgInCl 6 : Ho in Visible and NIR. As a result, a photoluminescence quantum yield of 18.63 % ranging from 800 to 1600 nm can be obtained. Finally, by coupling a Bi-doped sample with a commercial near-ultraviolet LED chip (395 nm), a compact Vis-NIR ultrawideband light source was prepared, which has promising applications in multifunctional illumination and night vision.
研究领域:
材料科学
·
光学
✓ 已验证
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DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Quanli Hu,Hanqiong Luo,Chao Song,Yin Wang,Jinghai Liu
HoCrO 3 displays fascinating magnetic characteristics. Owing to the co-presence of Ho 3+ and Cr 3+ ions, complex magnetic interactions are exhibited. A facile electrospinning as well as annealing way was utilized to make Fe-substituted HoCrO 3 nanofibers, which were HoCr 0.9 Fe 0.1 O 3 , HoCr 0.7 Fe 0.3 O 3 , and HoCr 0.5 Fe 0.5 O 3 . The perovskite orthorhombic structures of HoCrO 3 , HoCr 0.9 Fe 0.1 O 3 , HoCr 0.7 Fe 0.3 O 3 , and HoCr 0.5 Fe 0.5 O 3 were revealed by Rietveld refined XRD patterns. With the Fe substitution, the magnetic behaviors of HoCr 0.9 Fe 0.1 O 3 , HoCr 0.7 Fe 0.3 O 3 , and HoCr 0.5 Fe 0.5 O 3 NFs changed from canted antiferromagnetic at low temperature to paramagnetic at high temperature because of the combination of three kinds of magnetic contributions, namely Cr 3+ , Ho 3+ , and Fe 3+ . Fe substitution also enhanced the Cr 3+ ordering temperature from 139 to 161 K. This study should stimulate the development of holmium chromite nanomaterials for data storage devices and sensors.
研究领域:
材料科学
·
磁学
✓ 已验证
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DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 38
·5452-5460
·
IF 3.1
Huimin Du,Yunhao Liang,Xingzuo Liu,Yue Deng,Jie Yang,Jun Yang,Shanshan Hu
Yb2(MoO4)3:Ln3+ (Ln = Ho, Tm, Er) phosphors were synthesized by a hydrothermal method with further calcination. The crystal structure and morphology of the samples were characterized by X-ray diffraction and scanning electron microscopy. The effects of rare earth ion interaction in the Yb2(MoO4)3:Ln3+ phosphors on the upconversion (UC) luminescence properties and energy transfer process at different doping concentrations were discussed. It is concluded that by doping Ho3+, Tm3+, and Er3+ in the Yb2(MoO4)3 host, the phosphors emit orange-yellow, blue and green light, respectively, and the energy transfer from Yb3+ → Ho3+/Er3+ and Yb3+ → Tm3+ is a two and three photon process, respectively. Under the excitation of a 980 nm laser, by changing the Ho3+/Tm3+ ratio in doped Yb2(MoO4)3, we have realized the transition of phosphors from cold white light to warm white light. The temperature sensitivity of the 2H11/2 and 4S3/2 energy levels of Yb2(MoO4)3:Er3+ in the range of 323–573 K was studied by the FIR technology. The experimental results show that the maximum absolute sensitivity was 0.0081 K−1 at 573 K and the maximum relative sensitivity was 0.01 K−1 at 323 K. Compared with other materials, the Er3+ doped Yb2(MoO4)3 phosphor is an excellent optical temperature sensing material.
研究领域:
材料科学
·
光学
✓ 已验证
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DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901098
·
IF 7.125
Shunran Li,Qingsong Hu,Jiajun Luo,Tong Jin,Jing Liu,Jinghui Li,Zhifang Tan,Yibo Han,Zhi Zheng,Tianyou Zhai,Haisheng Song,Liang Gao,Guangda Niu,Jiang Tang
Low dimensional halide perovskites with self-trapped excitons (STEs) emission have emerged as promising white light phosphors because of their ultrabroadband emission covering the entire visible spectrum from 400 to 800 nm. Such a broad emission from a single material can overcome emission color change and self-absorption problems within multiple phosphors. However, the color rendering index (CRI) and correlated color temperature (CCT) as two essential parameters of white light quality can hardly be modulated in these perovskite materials. Here, rare earth ion Ho 3+ is introduced into Cs 2 (Na,Ag)InCl 6 for the first time, utilizing the hydrothermal method. Besides the strong warm white STEs emission, the as-synthesized materials exhibit effective characteristic emission of Ho 3+ in the visible region. Further, the mechanism of associated emission is explored and the existence of energy transfer from STEs to rare earth is first confirmed. A white light-emitting diode (LED) prototype is also fabricated by employing the Ho 3+ doped Cs 2 (Na,Ag)InCl 6 as the color conversion material on a commercial 365 nm GaN LED chip, achieving an improved CRI from 70.3 to 75.4 compared to the pure Cs 2 (Na,Ag)InCl 6 . This result suggests a promising way to achieve high quality single phase all-inorganic white phosphors and this mechanism has enormous potentials in other optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Jingheng Nie,Henan Li,Shaofan Fang,Bo Zhou,Zexiang Liu,Fuming Chen,Ye Wang,Yumeng Shi
Metal halide perovskites with efficient and stable self-trapped exciton emission have attracted considerable attention for next-generation solid-state lighting owing to their ultrabroadband emission. However, it remains challenging to widen the color gamut and realize high color-rendering index due to the lack of highly saturated red color-emitting inorganic lead-free perovskite materials with narrow full width at half-maximum. Here, we report a lanthanide-codoped system (Cs 2 NaInCl 6 :Sb 3+ /Ho 3+ ) that enables efficient blue and red emissions with photoluminescence quantum yields of up to 99% and 72%, respectively. The energy transfer efficiency in Ho 3+ -doped Cs 2 NaInCl 6 :Sb is up to 73%, which can overcome the weak absorption cross-section of the f-f transition of lanthanide ion and improve its luminescence performance. Benefitting from the efficient energy-transfer channel from the self-trapped excitons to Ho 3+ , the emission color is continuously tuned from blue to red by controlling the Ho 3+ -doping concentration.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Tingting Yan,Lei Sun,Dongyang Xi,Dinghan Jin,Han Li,Linan Liu
SrNb 2 O 6 and SrNb 2 O 6 :Ho 3+ red phosphors were successfully synthesized by a novel molten salt method. Compared with the traditional synthesis method, the reaction rate is faster at lower temperature. Scanning Electron Microscopy showed the samples are rod-like crystals with an average size of 5 μm. Upon excitation at 638 nm, the samples exhibited red emission peaks in the range of 640–680 nm, which are attributed to the Ho 3+ 5 F 5 → 5 I 8 electronic transition. As the concentration of Ho 3+ increases, the luminescence intensity gradually rises, peaking at x = 0.03. To explore the stability of the crystal structure under pressure, we conduct high-pressure Raman scattering experiments on SrNb 2 O 6 . Significant changes in the Raman spectra indicate a reversible phase transition between 3.1 and 5.4 GPa. Geometric optimization based on density functional theory suggest that the phase transitions originate from increased coordination of Sr atoms.
研究领域:
材料科学
·
光学
✓ 已验证
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DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Meiting Li,Bo Chen,Chi Zhang,Xuejiao Wang,Fufa Wu,Rongda Zhao
Tartrate (Tar 2− ) was originally employed as a chelating/structure-directing agent for hydrothermal synthesis of CdWO 4 :Yb 3+ ,RE 3+ (RE = Ho and Er) micro/nanocrystallites, followed by calcination at 700 °C for 2 h. It was clearly demonstrated that Tar 2− restricted the exposed ab planes and 3D self-assembly of microplates, resulting in ∼50 nm sized nanoparticles . Up-/down-conversion (UC/DC) photoluminescence were revealed to be strongly size dependent. Under 978 nm pump laser excitation, flower-like assembly was found to exhibit the stronger UC emissions of Ho 3+ and Er 3+ , among which two CdWO 4 :Yb 3+ ,Ho 3+ phosphors generated orange-yellow fluorescence via three-photon processes, while CdWO 4 :Yb 3+ ,Er 3+ microflowers and nanoparticles showed yellowish-green and pale green colors, respectively. Moreover, nanoparticles intensified the dominant green DC emissions of Ho 3+ and Er 3+ by ∼3 and 2 times, implying the pivotal roles of morphology engineering in tunable photoluminescence . This research may provide insights into crystallite/architecture engineering and luminescence optimization for near-infrared response solar cells and solid-state lighting.
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 ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weichang Li,Lili Hu,Wei Chen,Shiyu Sun,Malgorzata Guzik,Georges Boulon
Optical thermometry is a non-contact temperature detective technique that has high sensitivity and rapid response. In present work, we developed LiYF 4 :20Yb 3+ , 1Ho 3+ (mol%) micro octahedrons obtained by a modified hydrothermal method . The temperature dependent up-conversion (UC) emission and luminescence decays for LiYF 4 :20Yb 3+ , 1Ho 3+ under 976 nm LD excitation with various power density were studied systematically in the temperature range from 100 K to 500 K. The green and red UC emissions are sensitive to the sample temperature whereas the excitation power density in the studied temperature ranges plays a negligible role on the red to green UC emissions ratio. The non-contact optical temperature sensing behaviors were investigated based on the fluorescence intensity ratio (FIR) of red (R3 + R4) and green (G3) at temperature from 100 K to 500 K, which are ascribed to non-thermally coupled levels of Ho 3+ : 5 F 5 and 5 F 4 , respectively. The maximum absolute sensitivity (S a ) of 0.0477 K −1 and maximum relative sensitivity (S r ) of 0.0129 K −1 at the temperature range of 100–500 K based on FIR of (R3 + R4)/G3 were found. The mechanism of temperature effect on UC emission was discussed. The heating and cooling cycle test indicates the high thermal stability of LiYF 4 :20Yb 3+ , 1Ho 3+ . These results imply the LiYF 4 :20Yb, 1Ho has potential application in ratiometric thermometers and temperature sensing devices.
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 RARE EARTHS
·
2023
·
IF 4.9
Zhiyuan Cai,Zhengce An,Haozhang Huang,Yu Zhao,Bo Zhou
Upconversion based nanothermometry has received much attention due to its merits of stability, narrow band emission and rich emission peaks. However, the previous works are mainly based on the emissions from thermally coupled energy levels which is theoretically limited by Boltzmann distribution theory with resultant low temperature sensitivity in particular at ultralow temperatures. Here we report a LiYF 4 :Yb/Ho@LiYF 4 core-shell nanostructure to improve the sensitivity at low temperatures by taking advantage of non-thermally coupled energy levels of Ho 3+ . In detail, the green upconversion emission of Ho 3+ shows an increase with reducing temperature while its red upconversion emission presents a decline during the same process. This is primarily due to the suppression of the non-radiative multi-phonon relaxation occurred at the green emitting levels ( 5 F 4 , 5 S 2 ) and the intermediate level ( 5 I 8 ) at low temperatures. Such a feature contributes to a high relative sensitivity of 7.17%/K at 11 K, much higher than reported values. Our results provide a promising candidate for the development of nanothermometer with high-sensitive low-temperature sensing performance.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2026
·
IF 4.9
Feng Jiajun,Li Jiawei,Chen Huazheng,Chen Xiaolang,Yu Weili,Jiang Zihong,Huang Qimiao,Chen Lianfen,Li Xiang
Narrow-band green phosphors with tunable decay dynamics have attracted continuous interest for exploring novel luminescent materials. In this work, a series of Ho 3+ -doped sodium yttrium gallium indium germanium garnet (NYGIG) phosphors were synthesized via a conventional high-temperature solid-state reaction route. X-ray diffraction and X-ray photoelectron spectroscopy confirm that Ho 3+ ions are successfully incorporated into the garnet lattice at dodecahedral Y 3+ sites without inducing impurity phases or significant lattice distortion. Under 453 nm blue light excitation, the as-prepared phosphors exhibit intense green emission centered at 548 nm, originating from the 5 S 2 / 5 F 4 → 5 I 8 transition of Ho 3+ , along with a weaker near-infrared emission band at ~ 758 nm assigned to the 5 I 4 → 5 I 8 transition. The green emission intensity reaches its maximum at a Ho 3+ doping concentration of 7 mol%, and the corresponding color purity is calculated to be 83.5%.
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2026
·Vol. 132
·期 1
·63
·
IF 2.8
Yan Tingting,Sun Lei,Xi Dongyang,Jin Dinghan,Li Han,Liu Linan
This study reports the successful synthesis of Sr₄Nb₂O₉:xHo³⁺ (x = 0.005–0.04) green phosphors by molten salt method. Unlike conventional solid-state synthesis (1350 °C for 7 h), this method reduces the reaction temperature to 1100 °C and decreases processing time to 5 h, yielding products with regular platelet morphology. Comprehensive structural, morphological, and optical characterizations were performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The Sr₄Nb₂O₉:0.02Ho³⁺ phosphor exhibits a strong green emission peak at 530 nm under 460 nm excitation. The optimal doping concentration was determined to be 0.02 mol, with concentration quenching attributed to primarily mediated by dipole-dipole (d-d) interactions. The chromaticity coordinates (0.295, 0.696) indicate high color purity (99.5%) and a correlated color temperature (CCT) of 6033 K. High-pressure Raman experiments show that Sr₄Nb₂O₉ remains structurally stable up to 15.3 GPa. High-pressure fluorescence experiments reveal that the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor maintains 58% of its ambient-pressure fluorescence intensity even at 18.2 GPa. Furthermore, at 448 K, the phosphor retains 86.8% of its room-temperature fluorescence intensity. The quantum yield of the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor reached 23.6%. These findings suggest Sr₄Nb₂O₉:Ho³⁺ phosphors may be potential candidates for solid-state lighting applications in high-pressure environments. Graphical
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DOI
高影响因子
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