JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Tianzhi Jiang,Renguang Ye,Xinfeng Jin,Weigang Guo,Xiaoqing Liu,Shilong Zhao,Junjie Zhang,Shiqing Xu
Realization and optimization of enhanced/tunable optical luminescence properties is highly demanded for reliable and accurate temperature sensing. In this work, uniform monodisperse spherical Er 3+ /Yb 3+ co-doped Y 2 O 3 microcrystals of four different sizes have been synthesized via homogeneous precipitation by changing the reaction time, and the tuning of luminescence intensity/color was achieved by the controllable particles size. On this basis, by studying the particle size dependence of temperature sensing performance, we found that the behavior of absolute sensitivity ( S a ) and relative sensitivity ( S r ) have highly size dependence. Interestingly, when different FIR strategies were used (thermally coupled levels (TCLs) and nonthermally coupled levels (non-TCLs)), the sensitivity exhibits the opposite behavior. Importantly, when using the non-TCLs strategy, the maximum S a value for the smallest phosphors was 1.084 K -1 , leading to ∼246 times improvement compared to TCLs-based S a . The ultrahigh S a indicated that the Er 3+ /Yb 3+ co-doped Y 2 O 3 phosphors have potential in temperature detection, and the results are of guiding significance to studying the sensitivity of Y 2 O 3 particle size-dependent temperature measurement.
研究领域:
材料科学
·
光学
·
纳米技术
·
温度传感
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Jinghang Chen,Yuqi Ren,Yiwei Fu,Yitao Si,Jie Huang,Jiancheng Zhou,Maochang Liu,Lunbo Duan,Naixu Li
We report a solvothermal method for the synthesis of an oxygen vacancy-enriched ZrO2 photocatalyst with Co single atoms and Ni clusters immobilized on the surface. This catalyst presents superior performance for the reduction of CO2 in H2O vapor, with a CO yield reaching 663.84 μmol g–1 h–1 and a selectivity of 99.52%. The total solar-to-chemical energy conversion efficiency is up to 0.372‰, which is among the highest reported values. The success, on one hand, depends on the Co single atoms and Ni clusters for both extended spectrum absorption and serving as dual-active centers for CO2 reduction and H2O dissociation, respectively; on the other hand, this is attributed to the enhanced photoelectric and thermal effect induced by concentrated solar irradiation. We demonstrate that an intermediate impurity state is formed by the hybridization of the d-orbital of single-atom Co with the molecular orbital of H2O, enabling visible-light-driven excitation over the catalyst. In addition, Ni clusters play a crucial role in altering the adsorption configuration of CO2, with the localized surface plasmon resonance effect enhancing the activation and dissociation of CO2 induced by visible–near-infrared light. This study provides valuable insights into the synergistic effect of the dual cocatalyst toward both efficient photothermal coupling and surface redox reactions for solar CO2 reduction.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2023
·
IF 3.1
Aihua Zhou,Jiaxin Yang,Yan Li,Chengguo Ming,Yuanxue Cai,Yumiao Pei
Luminescence thermometry has recently been gaining popularity in science and technology fields. However, most reported works have used the fluorescence intensity ratio (FIR) to obtain the temperature based on thermally coupled energy levels (TCLs), which have hindered the sensitivity of the technique and limited its applications. Here, NaYF4:Yb/Tm@NaYF4:Yb/Ho microcrystals were prepared using a hydrothermal method. Based on the non-thermally coupled energy levels (NTCLs) of the double luminescent ionic centers Tm3+ and Ho3+, the materials exhibited temperature-dependent luminescence in the range of 304 K to 574 K. The maximum sensitivities were found to be Sa = 0.135 K−1 at 574 K and Sr = 1.101% K−1 at 484 K based on red (Tm3+) and green (Ho3+) emission bands. This study has provided a promising new strategy to break the TCL restriction and has shown the material to have potential applications in luminescence thermometry.
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 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
Results in Chemistry
·
2025
·
IF 4.2
Juan Wang,Renguang Ye,Youjie Hua,Xuejiao Wang,Tianzhi Jiang,Caixia Song,Luping Lyu,Junhao Wu,Hongping Ma,Chenxia Li,Degang Deng,Shiqing Xu
A series of Y 2 O 2 S: 0.25 % Ho 3+ /x%Yb 3+ (where x = 4, 6, 8, and 10) phosphors were synthesized by using a chemical co-precipitation method, and their temperature sensing properties were systematically investigated. The upconversion luminescence (UCL) spectra of the samples were recorded under 980 nm laser excitation. The Y 2 O 2 S: Ho 3+ /Yb 3+ system exhibits three distinct UC emission bands in the green, red, and near-infrared regions, corresponding to the transitions of 5 F 4 / 5 S 2 → 5 I 8 , 5 F 5 → 5 I 8 , and 5 F 4 / 5 S 2 → 5 I 7 of Ho 3+ , respectively. According to the emission spectra, the sample with a Yb 3+ doping concentration of 6 % exhibited the strongest luminescence intensity, with a quantum yield reaching 4.01 %. To further explore its temperature sensing properties, the fluorescence intensity ratios (FIR) of both thermally coupled energy levels (TCLs) and non-thermally coupled energy levels (NTCLs) of Ho 3+ were systematically analyzed. Notably, temperature sensing materials based on NTCLs exhibit significantly enhanced sensitivity while maintaining a broad temperature measurement range. Specifically, the absolute sensitivity (S A ) increased from 0.011 % to 0.498 %, representing an approximately 45-fold improvement. These findings indicate that Y 2 O 2 S: Ho 3+ /Yb 3+ UCL materials possess excellent potential for applications in optical temperature sensing.
研究领域:
材料科学
·
光学
·
固体物理
·
发光学
·
温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Wenwen Guo,Huangjie Bao,Han Chen,Guoneng Li,Youqu Zheng,Mengjie Zhang
Low-temperature and high-efficiency acetic acid (AcOH) steam reforming was realized based on photo-thermal coupled catalysis. Four semiconductor materials (ZnO, TiO 2 , CeO 2 , CeO 2 -TiO 2 ) were used as the supports and Co was selected as the active metal. The physical phases, crystal structures and specific surface areas of the different catalysts were analyzed by various characterization methods. From the XPS spectra, it can be seen that CeO 2 loaded with TiO 2 to make a composite support produced a higher proportion of Ce 3+ ions and formed more oxygen vacancies on the catalyst surface. The catalytic activity of all four catalysts was low at temperatures less than 400 °C, and the carbon conversion and hydrogen yield gradually increased with increasing temperature. Co/CeO 2 -TiO 2 had the best catalytic activity among the four catalysts and the carbon conversion of Co/CeO 2 -TiO 2 could reach 97.9 % at 500 °C. When photothermal co-catalysis was introduced, the four catalysts activity was enhanced with different degree. The carbon conversion enhancements of Co/CeO 2 -TiO 2 photocatalytic reaction reached an impressive 714.9 % and 78.7 % at 300 and 350 °C respectively. The experimental results indicated that photo-thermal synergy had a more dramatic effect on the catalyst activity than single thermal drive at low temperatures. It might be due to the fact that the oxygen vacancies generated in the composite support CeO 2 -TiO 2 acted as electron supports to provide more favorable channels for the transport and migration of photogenerated electrons, which could effectively separate the photogenerated electrons and holes, thus improving the catalytic performance of the catalyst.
研究领域:
化学工程
·
催化材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Wenbin Zhang,Longjiang Zheng,Wei Xu,Leipeng Li,Zhiguo Zhang
Non-contact optical thermometry, based on the luminescence intensity ratio (LIR) of two thermally-coupled levels (TCLs), has received increasing attentions nowadays. Designing novel TCLs-based temperature sensor becomes one of the most significant things in the field of optical thermometry. In this work, a novel strategy for temperature measurement is proposed. It is based on the 4 F 7/2 and 4 S 3/2 TCLs, rather than the widely studied 2 H 11/2 and 4 S 3/2 TCLs of Er 3+ . Both the two pairs of TCLs have been confirmed to be under the control of the Boltzmann distribution and thus can be used for luminescence ratiometric thermometry. The former TCLs have a larger energy gap (1808 cm −1 ) than the latter ones (711 cm −1 ). Based on this fact, it is shown here that using the 4 F 7/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 transitions can achieve a more sensitive temperature measurement than that depending on the 2 H 11/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 transitions at the operating temperatures from 333 to 773 K. At 333 K, the relative sensitivity ( S R ) of the former two transitions is calculated to be ~2.3% K −1 . By comparison, using the latter two transitions only has a S R of 0.9% K −1 at the same temperature.
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2017
·Vol. 7
·期 8
·3003-3010
·
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.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yinghao Wei,Sen Yang,Chenyang Zhang,Guanying Chen,Ai-Hua Li
In recent years, lanthanide doped materials have been extensively studied in the field of fluorescence temperature sensing due to their abundant emission levels and sensitive thermal response. Temperature sensing based on fluorescence intensity ratio (FIR) of upconversion nanoparticles has the advantages of fast temperature response, non-aggressiveness, and high spatial resolution. However, the most reported FIR sensing has limited sensitivity, probably due to the use of thermal coupling levels. Herein, we report a novel FIR temperature measurement based on non-thermal coupling levels of NaGdF 4 :Yb 3+ /Er 3+ @NaGdF 4 @NaGdF 4 :Yb 3+ /Tm 3+ core-shell-shell nanostructure , which has high sensitivity and robustness simultaneously. The relative sensitivity based on I 801 / I 654 and I 801 / I 841 of Tm 3+ to Er 3+ can reach up to 4.56 (303 K) and 3.82% K −1 (313 K), respectively. Between them, FIR of I 801 / I 841 is independent of excitation power and time. These results show the great potential of FIR based on non-thermal coupling levels in high-sensitive and robust temperature sensors .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 26
·11179-11189
·
IF 6.7
Zhenlong Cheng,Mingzhou Meng,Jiaoyu Wang,Zhuoyue Li,Jiao He,Hao Liang,Xin Qiao,Yuanli Liu,Jun Ou
Non-contact optical temperature sensors are highly sought after by researchers due to their satisfactory temperature resolution (δ(T) < 0.1 °C), high relative thermal sensitivity (Sr > 1% °C−1), fast temporal response (t < 0.1 s), and long-term optical stability. In this study, NaYF4:Yb3+/Ho3+/Tm3+ upconversion nanoparticles were prepared by a solvothermal method, and their crystal structure, microscopic morphology, and luminescence mechanism, together with the temperature sensing properties of the specimens, were investigated. Under 980 nm laser excitation, the specimens exhibited strong upconversion luminescence, and the emission peaks corresponded to the characteristic energy level jumps of Ho3+ and Tm3+, respectively. The temperature-dependent luminescence spectra of the samples were investigated based on the fluorescence intensity ratio (FIR) technique over a temperature gradient of 295–495 K. The samples are based on thermally coupled energy levels (TCLs: 1G4(1,2) → 3H6(Tm3+)) and non-thermally coupled energy levels (NTCLs: 3F3 → 3H6(Tm3+) and 5F3 → 5I8(Ho3+), 3F3 → 3H6(Tm3+) and 1G4 → 3H6(Tm3+), 3F3 → 3H6(Tm3+) and 5F5 → 5I8(Ho3+), 3F3 → 3H6(Tm3+) and 5F4 → 5I8(Ho3+)) for temperature sensing performance. The maximum absolute sensitivity (Sa), relative sensitivity (Sr), and minimum temperature resolution δ(T) were found to be 0.0126 K−1 (495 K), 1.7966% K−1 (345 K), and 0.0167 K, respectively, which are better than those of most sensing materials, and the simultaneous action of multiple coupling energy levels can further improve the temperature precision. This study indicates that the sample has a good value for optical temperature measurement and also provides new ideas for the exploration of other high-quality optical temperature sensing materials.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xianghui Zeng,Hui Chen,Yongzheng Liu,Wei Fang,Zhaohui Huang,Lei Zhao
Solar-driven CO 2 conversion into fuels using particulate photocatalysts is a promising strategy for mitigating CO 2 emissions with minimal environmental impact. However, the efficiency of CO 2 photoreduction remains limited by the inherent trade-off between light absorption and charge transfer kinetics in single photocatalysts. Herein, we propose an innovative microtubular photocatalytic system consisting of integrated photothermal-photocatalytic materials. The system is based on hollow microtubular g-C 3 N 4 substrates, which are wrapped with thin layers of graphene oxide (GO) acting as photothermal generators, while CoS 2 nanoparticles are embedded between the layers to facilitate charge transfer. The synergistic effects of photon and thermal energy significantly reduce the activation energy by approximately 14 times, thereby promoting oriented electron transfer. Under full spectrum irradiation, the system exhibits superior CO 2 reduction performance, achieving CO and CH 4 yields of 143.73 and 60.27 μmol g −1 , respectively, surpassing the combined contributions from light and heat alone.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 20
·4887
·
IF 4.2
Hui Zeng,Yangbo Wang,Xiaoyi Zhang,Xiangbing Bu,Zongyi Liu,Huaiyong Li
Excitation wavelength controllable lanthanide upconversion allows for real-time manipulation of luminescent color in a composition-fixed material, which has been proven to be conducive to a variety of applications, such as optical anti-counterfeiting and information security. However, current available materials highly rely on the elaborate core–shell structure in order to ensure efficient excitation-dependent energy transfer routes. Herein, multicolor upconversion luminescence in response to both near-infrared I and near-infrared II (NIR-I and NIR-II) excitations is realized in a novel but simple NaYGeO4:Yb3+/Er3+phosphor. The remarkably enhanced red emission ratio under 1532 nm excitation, compared with that under 980 nm excitation, could be attributed to the Yb3+-mediated cross-relaxation energy transfers. Moreover, multi-wavelength excitable temperature-dependent (295–823 K) upconversion luminescence realizes a ratiometric thermometry relying on the thermally coupled levels (TCLs) of Er3+. Detailed investigations demonstrate that changing excitation wavelength makes little difference for the performances of TCL-based ratiometric thermometry of NaYGeO4:Yb3+/Er3+. These findings gain more insights to manipulate cross-relaxations for excitation controllable upconversion in single activator doped materials and benefit the cognition of the effect of excitation wavelength on ratiometric luminescence thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）