Materials Research Express
·
2018
·Vol. 5
·期 10
·106203
·
IF 1.151
Tao Pang,Wenbo Peng
Upconversion luminescence of Yb3+/Er3+ and Yb3+/Tm3+ co-doped Y2(MoO4)3 phosphors under 980 nm excitation is investigated. It is demonstrated that Yb3+ co-doping causes a significant thermal effect. For Yb3+ and Er3+ co-doped case, the thermal effect, the long-distance energy migration and the energy transfer from Er3+ to Yb3+ are responsible for the abnormal luminescence quenching. In the case of Yb3+ and Tm3+ co-doped, the thermal effect improves the excited efficiency of Tm3+, and thus the luminescence of Tm3+ continues to strengthen at the Yb3+ concentration that causes Er3+ luminescence quenching. These results contribute to the design of the efficient upconversion materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-12
·
IF 20.257
Zhang Yan,Miao Shihai,Liang Yanjie,Liang Chao,Chen Dongxun,Shan Xihui,Sun Kangning,Wang Xiao-Jun
The growing demand for spectroscopy applications in the areas of agriculture, retail and healthcare has led to extensive research on infrared light sources. The ability of phosphors to absorb blue light from commercial LED and convert the excitation energy into long-wavelength infrared luminescence is crucial for the design of cost-effective and high-performance phosphor-converted infrared LEDs. However, the lack of ideal blue-pumped short-wave infrared (SWIR) phosphors with an emission peak longer than 900 nm greatly limits the development of SWIR LEDs using light converter technology. Here we have developed a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability by co-doping Cr 3+ -Yb 3+ ion pairs into Lu 0.2 Sc 0.8 BO 3 host materials. Benefitting from strong light absorption of Cr 3+ in the blue waveband and very efficient Cr 3+ →Yb 3+ energy transfer, the as-synthesized Lu 0.2 Sc 0.8 BO 3 :Cr 3+ ,Yb 3+ phosphor emits intense SWIR light in the 900–1200 nm from Yb 3+ under excitation with blue light at ~460 nm. The optimized phosphor presents an internal quantum yield of 73.6% and the SWIR luminescence intensity at 100 °C can still keep 88.4% of the starting value at 25 °C. SWIR LED prototype device based on Lu 0.2 Sc 0.8 BO 3 :Cr 3+ ,Yb 3+ phosphor exhibits exceptional luminescence performance, delivering SWIR radiant power of 18.4 mW with 9.3% of blue-to-SWIR power conversion efficiency and 5.0% of electricity-to-SWIR light energy conversion efficiency at 120 mA driving current. Moreover, under the illumination of high-power SWIR LED, covert information identification and night vision lighting have been realized, demonstrating a very bright prospect for practical applications.
研究领域:
光学材料
·
固态照明
·
红外光谱学
·
发光二极管技术
·
光转换材料
✓ 已验证
DOI
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
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·1046-1056
·
IF 3.094
Xiaohui Feng,Le Wang,Ran Wei,Ziyan Wang
Non-contact temperature sensors based on the fluorescence intensity ratio (FIR) have been widely investigated owing to their high sensitivity and reliable real-time monitoring. Herein, the SiO 2 -coated LiY(MoO 4 ) 2 @SiO 2 :Er 3+ ,Yb 3+ phosphor was investigated as an optical thermometry material, which was synthesized using the conventional solid state reaction and coated by a facile wet chemical route. The effect of surface modification on FIR was systematically characterized by structural analyses and spectral measurements and the temperature-dependent up-conversion FIR was investigated from 303 to 603 K under a 980 nm laser excitation. The results showed that the FIR value was thermally stable and the SiO 2 coating led to a higher FIR sensitivity as well as a higher saturation threshold. This work would pave a way to design interesting optical thermometry materials in up-conversion phosphors with better properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Wanghui Xu,Xinghua Jia,Chunlin Dong,Li Liu,Wei Wang,Ting Yu
Cr 3+ activated broadband near-infrared (NIR) emitting phosphors have attracted more attention worldwide as they are strongly expected to be promising light convertors for phosphor-converted NIR light sources for NIR spectroscopy and imaging technologies. Herein, a new broadband NIR emitting phosphor Cr 3+ -doped Li 3 Sc(BO 3 ) 2 (LSBO) is introduced. Microcrystalline powders of LSBO doped with different Cr 3+ concentrations were synthesized by solid-state reactions and showed an NIR emission extending from 700 to 1100 nm with a peak at 830 nm upon excitation at 460 nm. The structure, concentration and temperature-dependent luminescence properties of LSBO:Cr 3+ phosphors were discussed in detail. The optical properties of Cr 3+ ions in LSBO were examined in terms of spectroscopic parameters. Moreover, efficient energy transfer from Cr 3+ to Yb 3+ was leveraged to significantly improve the NIR emission intensity and the thermal stability. The enhancement and energy transfer mechanisms have been discussed in detail. These results open up new ways to realize efficient NIR-emitting materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2025
·
IF 5
Lingjun Zhou,Panyi Wang,Tenglong Sun,Yanan Chen,Muzhi Cai,Wenyan Zheng,Feifei Huang,Ying Tian,Liaolin Zhang,Junjie Zhang
Tellurite glasses with the composition 67TeO 2 -3Al 2 O 3 -xZnO-(30-x)Na 2 O (x = 0–20 mol%) were synthesized via melt-quenching. Raman analysis revealed Al/Zn synergistically strengthened the network via Al-O-Te/Zn-O-Te bonds below 15 mol% ZnO, whereas excess ZnO triggered Zn 2+ /Al 3+ site competition, reducing crystallization resistance. The glass with 15 mol% ZnO (TANZ) shows optimal thermal stability ( T g = 311 °C, ΔT = 139 °C) and serves as the host for obtaining mid-infrared emission. The Ho 3+ /Yb 3+ co-doped TANZ glass shows high absorption and emission cross-sections of 7.36 × 10 –21 cm 2 and 5.86 × 10 –21 cm 2 , respectively, along with a long lifetime of 1.33 ms at 2 μm. These results highlight the potential of TANZ glasses as robust gain materials for mid-infrared fiber lasers.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Ting Zhang,Xiaoqian Zhang,Qinan Mao,Fangyi Zhao,Heyi Yang,Xinyue Li,Jiasong Zhong
Lanthanide doping has been instrumental in tuning the emissions of double perovskite halides (DPHs) into the near-infrared (NIR) region. However, the limited penetration depth of UV excitation and typically low photoluminescence quantum yield (PLQY) of these materials restrict their utility in biomedical applications. In this paper, Cr3+-doped lead-free DPHs (Cs2NaScCl6:Cr3+) have been explored, featuring a broadband NIR emission spanning 800–1300 nm and an impressive PLQY of 76.9%. Oriented toward biological applications, we employ Yb3+ as a codopant to be introduced into Cs2NaScCl6:Cr3+. The novel Cs2NaScCl6:Cr3+,Yb3+ crystal powder displays a red-shifted emission (peaking at 995 nm) with a remarkably narrower full width at half-maximum (fwhm) of 51 nm. Importantly, the efficient energy transfer between Cr3+ and Yb3+ enables Cs2NaScCl6:Cr3+,Yb3+ to maintain a PLQY of 46.1% upon 780 nm excitation. Leveraging its NIR-I excitable and NIR-II emissive properties, Cs2NaScCl6:Cr3+,Yb3+ presents great potential in biodetection and bioimaging applications. Its superior energy transfer efficiency, high PLQY, and favorable spectral characteristics position this material as a promising candidate for advanced biomedical techniques requiring deep tissue penetration and high imaging contrast.
研究领域:
材料科学
·
生物医学工程
✓ 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
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
T. Wei,C.P. Li,Q.J. Zhou,Z.P. Li,P. Li,J. Wu,X.F. Yang
Ho 3+ - and Yb 3+ -codoped Sr 4 La 2 Ti 4 Nb 6 O 30 (Sr 4 La 1.94– x Ho 0.06 Yb x Ti 4 Nb 6 O 30 , abbreviated as SLTN: Ho-Yb x ) ceramics have been synthesized, and their structural, up-conversion (UC) photoluminescence, and dielectric properties have been carefully investigated. Through Rietveld structural refinement, SLTN: Ho-Yb x samples are determined as single tetragonal tungsten bronze (TTB) phase with space group P 4 /mbm in which larger Sr 2+ ions fill the A 2 -sites, relative smaller La 3+ , Ho 3+ , and Yb 3+ ions occupy the A 1 -sites, while Ti 4+ and Nb 4+ ions fill the B-sites. Under 980 nm near infrared (NIR) excitation, bright UC green emission, relatively weak red and near-infrared (NIR) emissions, originating from 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 transitions of Ho 3+ ions, are confirmed for SLTN: Ho-Yb x . Two-photon energy transfer process is proved through pumping laser power dependence of emission intensity measurement. Furthermore, the influence of Ho 3+ - and Yb 3+ - ions on the dielectric properties of SLTN: Ho-Yb x is also investigated and the temperature stability of dielectric permittivity is improved.
研究领域:
材料科学
·
光学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongxiang Shao,Xianju Zhou,Faling Ling,Li Li,Yongjie Wang,Jingfang Li,Ruiheng Pan,Hongmei Yang,Guangxin Xie
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have become important as new NIR light sources in NIR spectroscopy and NIR imaging techniques . However, currently developed broadband NIR phosphors commonly suffer from weak emission and poor thermal stability. In this work, a series of Gd 3 Lu 2 Ga 3 O 12 : Cr 3+ phosphors were synthesized via high-temperature solid-state reaction. Under 460 nm excitation, the phosphors exhibit an intense emission spanning from 650 to 1150 nm with a full width at half maximum (FWHM) of 122 nm. After introducing Yb 3+ as a co-dopant, the emission of the phosphor has been broadened greatly. Interestingly, the studied phosphors demonstrate super high thermal stability in a wide temperature range of 35–560 K, with the integrated emission intensity fluctuating within 10 %. At 435 K, the emission intensity of Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ remains 99.5 % and Gd 3 Lu 2 Ga 3 O 12 : 0.03Cr 3+ , 0.01 Yb 3+ keeps 102.7 % of the initial intensity at room temperature. These NIR phosphors have been encapsulated with a common commercial 460 nm blue LED chip to fabricate a pc-LED device. The NIR output power of the device reaches 23.93 mW@100 mA, with a photoelectric conversion efficiency of 9.81 % at 20 mA current. The applications of the prepared NIR light source in night vision, and bioimaging have been demonstrated. The results show that these Cr 3+ /Yb 3+ doped garnet phosphors can be effectively used in NIR light sources .
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）