LANGMUIR
·
2022
·
IF 4.331
Peng Du,Laihui Luo,Di Wang,Weiping Li,Dandan Wang,Zhihong Mai,Ye Wang,Weiguang Ran,Guozhong Xing
To settle the unsatisfying efficiency and insufficient light harvesting ability of photocatalysts, we report on the development of Er3+/Yb3+-codoped BiOBr (BiOBr:Er3+/xYb3+) microparticles that were synthesized by a rational high-temperature solid-state reaction method. The prepared microcrystals exhibit high visible upconversion (UC) emissions with maximum intensities at x = 0.01 when excited by a 980 nm laser. Remarkably, the corresponding UC emission process is attributed to a two-photon absorption route. Furthermore, the photocatalytic activities of as-synthesized compounds were further evaluated through analyzing the visible–near-infrared light-triggered tetracycline degradation. Compared with BiOBr:Er3+ microparticles, BiOBr:Er3+/xYb3+ microparticles present superior photocatalytic properties and the optimal status is achieved when x = 0.05, in which h+, ·O2–, and ·OH active species contribute to the photocatalytic mechanism. Additionally, the designed microparticles exhibit better photocatalytic abilities than previously reported photocatalysts (i.e., TiO2, SnO2) upon full-spectrum light irradiation. These results reveal that Yb3+ codoping is able to not only enhance the UC emission properties of BiOBr:Er3+ microparticles but also reinforce their photocatalytic activities. Our findings may put forward a facile strategy to regulate the photodegradation capacity of photcatalysts.
研究领域:
材料科学
·
环境科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hao Gou,Qian Wu,Laihui Luo,Weiping Li,Peng Du
Series of Er 3+ /Yb 3+ -codoped Gd 2 Mo 3 O 12 (GMO:Er 3+ /2 x Yb 3+ ) microparticles with dual-mode luminescence were fabricated with the assistance of sol-gel method. The phase structure, morphological information, upconversion (UC) and down-shifting luminescence properties of the final products were systematically investigated. At 980 nm light irradiation, strong UC emissions rise in all the products and their intensities depend on the dopant concentration, where the optimum status occurs at x = 0.25 and the two-photon capture procedure results in the UC emission mechanism. Besides, excited at 378 nm, the down-shifting photoluminescence is also gained in resulting samples. By means of the fluorescence intensity ratio technique, the thermometric properties of the studied samples were investigated through analyzing the diverse thermal quenching features of the green emissions from thermally coupled levels of Er 3+ . When the UC emission is selected, the maximum absolute and relative sensitivities of the GMO:Er 3+ /2 x Yb 3+ microparticles are 0.0076 and 1.15% K −1 , respectively, whereas they shift to 0.0036 and 0.89% K −1 , respectively, when the down-shifting photoluminescence is adopted. Note that, the sensor sensitivities of developed microparticles are related to the luminescence mode, while they do not depend on Yb 3+ content. These results suggest that the GMO:Er 3+ /2 x Yb 3+ microparticles are promising thermosensitive luminescent materials for optical thermometry and their thermometric features can be tuned through changing luminescence mode.
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 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
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Mei-Hong Liu,De-Long Zhang
Er 3+ /Yb 3+ -codoped NaLa(WO 4 ) 2 phosphor samples with different Er 3+ and Yb 3+ doping levels were synthesized by solid-state chemical reaction for optical thermometry and fully characterized. The results show that each phosphor sample mainly consists of NaLa(WO 4 ) 2 crystalline phase and has a nominally stoichiometric chemical composition. The phosphor grains have massive polyhedron morphology, good size homogeneity with a mean value of ∼5 μm and a cutoff phonon energy of 927 cm −1 . The 530 and 550 nm upconversion fluorescence of Er 3+ in the phosphor samples and their temperature characteristics were investigated under 980 nm excitation. The results show that the phosphor exhibits strong upconversion fluorescence and the maximum fluorescence intensity is observed at the optimal Er 3+ and Yb 3+ doping levels of 5 and 20 mol%, respectively. The two-photon process is responsible for the upconversion fluorescence. The spectral structure of either 530 or 550 nm fluorescence band is thermally stable. The peak absolute thermal sensitivity is observed at ∼490 K and has a peak value of ∼9 × 10 -3 K -1 . As expected, Er 3+ or Yb 3+ doping level has little effect on the thermal sensitivity. The phosphor displays a wide dynamical response range of thermal sensitivity from 293 to 800 K, where the sensitivity varies within (6.5–9.0) × 10 -3 K -1 . A comparison study shows that the temperature characteristics obtained from the cooling procedure are almost the same as those obtained from the heating procedure. Besides, the effects of Er 3+ /Yb 3+ doping level and heating/cooling on fluorescence color chromaticity were also studied. Based on the results, the Er 3+ /Yb 3+ -codoped NaLa(WO 4 ) 2 phosphor shows strong fluorescence, good thermal stability, high thermal sensitivity and broad response range of thermal sensitivity. Thus, it is a promising material for thermal detection over a wide temperature range of 293−800 K.
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
·
2025
·
IF 3.6
Xutong Wang,Shuyang Chen,Shiqing Xu,Liang Chen
For the first time, a straightforward optical fiber temperature sensing system based on La 2 MoO 6 :Er 3+ , Yb 3+ phosphors is proposed. The La 2 MoO 6 : Er 3+ , Yb 3+ phosphors were synthesized successfully using the molten salt method. A dual-mode temperature measurement technique based on the fluorescence intensity ratio (FIR) is introduced. The thermally coupled energy levels ( 2 H 11/2 and 4 S 3/2 ) and non-thermally coupled levels ( 2 H 11/2 and 4 F 9/2 ) exhibit maximum relative sensitivities of 1.24 % K −1 and 0.79 % K −1 at 293 K, respectively. The temperature resolution achieved was below 0.5 K. By utilizing the phosphor and optical fiber temperature sensor , real-time and accurate temperature monitoring was achieved, with a temperature deviation of less than 0.5 K. The optical fiber temperature sensor system provides exceptional reversibility and stability, while also playing a crucial role in precise remote temperature measurements under challenging conditions.
研究领域:
材料科学
·
光学工程
·
生物医学传感
·
纳米医学
·
分子影像
✓ 已验证
产品关联
DOI
高影响因子
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
危险品化学品经营许可证（带存储）