OPTICAL MATERIALS
·
2024
·
IF 3.8
Qizheng Dong,Yuanyuan Wang,Xueyou Zhu,Ling He
Ca 2+ and Tm 3+ co-doped CsPbBr 3 @glass composites were successfully synthesized through the high-temperature melting-water quenching-heat treatment method. Enhancement of optical performance is achieved through dual doping, harnessing simultaneous influences from both the glass structure and the inherent structure of CsPbBr 3 quantum dots (QDs). The presence of Ca 2+ in the glass reduces its viscosity and enhances the precipitation of QD crystals. Concurrently, the incorporation of Tm 3+ leads to the control of dimensions and band gaps, reduction in V Br defects, and the potential creation of energy transfer pathways, thereby effectively improving the optical performance of QDs. Simultaneous co-doping with Ca 2+ circumvents the drawback of low crystallinity observed in singly Tm 3+ -doped CsPbBr 3 QDs. In contrast to the undoped sample, the photoluminescence (PL) intensity of the optimized sample demonstrated a significant increase of 128 %. The photoluminescence quantum yield (PLQY) also experienced a rise from 18 % to 55 %, while the fluorescence lifetime extended from 68 ns to 107 ns. Furthermore, the encapsulation of the borosilicate glass matrix has been shown to greatly improve the time, water, thermal, and photostability of CsPbBr 3 QDs. These remarkable properties position the Ca 2+ and Tm 3+ co-doped CsPbBr 3 QDs@glass composites as ideal materials for illumination and wide-color-gamut displays.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 35
·12327-12337
·
IF 4.174
Mingyue Xu,Bin Chi,Zhiyuan Han,Yuting He,Feng Tian,Zushun Xu,Ling Li,Jing Wang
Gd3+ and Tm3+ doped Prussian blue (Gd/Tm–PB) with high uniformity and dispersibility was synthesized by a facile solvothermal method. The conditions for the synthesis of Gd/Tm–PB were explored. Through the regulation of the ratio of Gd3+/Tm3+, the Gd/Tm–PB particles with the optimal size (about 150–200 nm) and the best fluorescence and photothermal effect were obtained. On the basis of the optimal Gd/Tm–PB, further coated by polydopamine (PDA) functionalized metal–organic frameworks (MOFs), a multifunctional platform Gd/Tm–PB@ZIF-8/PDA for cancer diagnosis and treatment was established. Doxorubicin (DOX) was selected as a drug model and the drug loading of Gd/Tm–PB@ZIF-8/PDA was found to be 81 mg g−1. Cytotoxicity analysis indicated that Gd/Tm–PB@ZIF-8/PDA was highly biocompatible. The DOX release at different pH values and GSH concentrations revealed an excellent pH/GSH-triggered drug release. Through the combination of the near infrared photothermal performance of Gd/Tm–PB, chemo-photothermal therapy can be achieved to further improve the anti-cancer efficiency. In addition, the Gd/Tm–PB@ZIF-8/PDA nanoparticles can be tracked by fluorescence imaging (FOI) and magnetic resonance imaging (MRI). Cell FOI and in vivo MRI experiments showed the potential application of Gd/Tm–PB@ZIF-8/PDA in dual mode imaging guided therapy. In vivo antitumor experiments demonstrated the higher anticancer efficacy of Gd/Tm–PB@ZIF-8/PDA with a combined effect of chemo-photothermal therapy. This work provides a new strategy for nano-drug carriers in the direction of integrated diagnosis and treatment.
研究领域:
纳米技术
·
生物医学工程
·
癌症研究
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 40
·14030-14045
·
IF 4.174
Kailian Zhang,Jie Guan,Ping Mu,Kai Yang,Yu Xie,Xiaoxiao Li,Laixi Zou,Weiya Huang,Changlin Yu,Wenxin Dai
To effectively enhance the utilization of clean sunlight energy, harvesting a large percentage of near infrared (NIR) light is significant. One of the commonly used effective methods for modifying semiconductors is by co-doping upconversion materials on semiconductors to heighten the photocatalytic efficiency. In this work, Yb3+/Tm3+ co-doped InVO4 nanosheets were synthesized by a facile hydrothermal path, and the crystal phases, morphologies, surface chemical compositions, as well as optical properties were characterized. Yb3+/Tm3+ co-doped InVO4 revealed significantly enhanced photoactivity towards chromium(VI) reduction and methyl orange oxidation under visible or NIR light irradiation. Furthermore, 5YT-IV presented the highest electrocatalytic performance and photocatalytic production of H2O2 under visible light irradiation, requiring low overpotential and low Tafel slope (390 mV dec−1) for hydrogen evolution reaction than that of the bare InVO4 (731 mV dec−1), and as well improved the yield of photocatalytic H2O2 production by about 3.5 times. This was primarily ascribed to intensive light absorption resulting from the benign upconversion energy transfer of Yb3+/Tm3+ and the boosted charge separation caused by the intermediate energy states. Moreover, the presence of h+ and ˙O2− as the main oxidative species played a significant role during the photocatalytic oxidation process of methyl orange and electrons played a decisive role in Cr(VI) reduction. This study provides a promising platform for efficiently utilizing the visible-NIR energy of sunlight in the field of photocatalytic H2O2 production and for alleviating environmental pollution in future.
研究领域:
材料科学
·
光催化
·
环境科学
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sen Yang,Yinghao Wei,Qi Wang,Zhijun Sun,Ai-Hua Li
Lead-free double perovskites have superb luminescence properties for broad applications. However, increasing or improving near-infrared (NIR) photoluminescence (PL) is still a challenge. In this paper, a high-performance microcrystal is designed based on Tm 3+ heavily doped Cs 2 Ag 0.6 Na 0.4 In 0.9 Bi 0.1 Cl 6 (CANIBC), which realize both the self-trapped excitons (STEs) and Tm 3+ NIR emission. The emission mechanism and energy transfer (ET) process are studied by steady-state and time-resolved PL spectra. The ET efficiency from STEs to Tm 3+ can reach 38.3 %, and the NIR PL quantum yield of Tm 3+ can reach 22.7 %. Meanwhile, the PL spectra of Tm 3+ -doped CANIBC microcrystals (MCs) with different concentrations are used to investigate their temperature sensing properties based on both fluorescence intensity ratio (FIR) and lifetime. Based on the FIR, relative sensitivity ( S r ) can reach 2.93 % K −1 at 303 K. Moreover, based on lifetimes, S r can maintain more than 1.55 % K −1 from 303 to 453 K, and maximum S r can also achieve 2.38 % K −1 at 360 K. These excellent luminescence and sensing properties offer greater development potential in the field of NIR phosphor and thermometry.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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
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
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 16
·22050-22058
·
IF 5.6
Yixuan Guo,Huimin Li,Ran Pang,Da Li,Lihong Jiang,Su Zhang
In this study, Tm 3+ -doped Ca 2 MgWO 6 (CMWO) phosphors were prepared and thoroughly analyzed. The structure, luminescent and temperature-dependent behavior of the phosphors were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), photoluminescence (PL) and excitation (PLE) spectra, along with temperature-dependent PL spectroscopy . XRD and SEM analysis confirmed the successful preparation of a pure-phase double perovskite structured Ca 2 MgWO 6 phosphor with successful Tm 3+ doping. The PL spectrum indicates that the phosphor emits light under both 285 nm and 361 nm excitation. The PLE spectrum reveals that the optimal doping concentration of Tm 3+ for 285 nm excitation is 0.007, while for 361 nm excitation, it is 0.08. The phosphor was then tested for variable-temperature emission spectra , and its temperature-sensing performance was evaluated using the fluorescence intensity ratio (FIR) method. Under 361 nm excitation, the CMWO:0.08 Tm 3+ phosphor exhibited a maximum relative sensitivity ( S r(max) ) of 2.33 % K −1 at 348 K, within the temperature range of 198–348 K. When excited at 285 nm, the CMWO:0.007 Tm 3+ phosphor displayed strong temperature dependence in the range of 98–223 K, with an S r(max) of 14.71 % K −1 at 223 K, surpassing many thermometric phosphors reported in the literature. These results highlight the significant potential of CMWO:Tm 3+ phosphors as highly sensitive optical temperature sensors, particularly for low-temperature applications.
研究领域:
材料科学
·
光学传感器
·
发光材料
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2023
·Vol. 11
·期 8
·323
·
IF 2.9
Huichao Zhang,Jinpeng Xin,Huaimin Jin,Wenhao Xiang,Muqing Chen,Yang-Rong Yao,Shangfeng Yang
Metal cyanide clusterfullerenes (CYCFs) are formed via the encapsulation of a single metal atom and a cyanide unit inside fullerene cages, endowing them with excellent properties in various applications. In this work, we report the synthesis, isolation, and characterizations of the first cases of thulium (Tm)-based CYCFs with the popular C82carbon cages. The structural elucidation of the two TmCN@C82isomers was achieved via diverse analytical techniques, including mass spectrometry, Vis-NIR spectroscopy, single-crystal X-ray crystallography, and cyclic voltammetry. The crystallographic analyses unambiguously confirmed the molecular structures of the two TmCN@C82isomers as TmCN@Cs(6)-C82and TmCN@C2v(9)-C82. Both TmCN clusters adopt a well-established triangular configuration, with the Tm ion located on the symmetrical plane of the carbon cages. The electronic structures of both TmCN@C82isomers adopt a Tm3+(CN)−@(C82)2−configuration, exhibiting characteristic spectral and electrochemical properties reminiscent of divalent endohedral metallofullerenes (EMFs). Intriguingly, unlike the divalent Tm2+ion observed in the mono-metallofullerenes Tm@C2n, a higher oxidation state of Tm3+is identified in the monometallic TmCN cluster due to bonding with the cyanide anion. This result provides valuable insight into the essential role of the non-metallic endo-units in governing the oxidation state of the metal ion and the electronic behaviors of EMFs.Keywords:endohedral metallofullerenes;cyanide clusterfullerenes;thulium;X-ray crystallography
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2014
·
IF 1.716
W.C. Wang,J. Yuan,X.Y. Liu,D.D. Chen,Q.Y. Zhang,Z.H. Jiang
The competition between infrared down-conversion (DC) and visible up-conversion (UC) is systemically studied in Tm 3 + and/or Yb 3 + /Tm 3 + co-doped fluoride modified germanate glasses. Based on the absorption spectra , the Judd–Ofelt intensity parameters, absorption and emission cross-sections, figure of merit (FOM), and saturated gain coefficient are calculated and analyzed. An intense 1.8 μm emission is obtained upon 808 nm laser diode (LD) excitation in Tm 3 + doped samples, while an efficient 1.8 μm emission is observed by 980 nm LD in Yb 3 + /Tm 3 + co-doped samples, along with visible UC emissions. It is found that 3 F 4 state of Tm 3 + can be easily populated and then further excited to higher excited states through Yb 3 + upon 980 nm LD. Our results suggest that these Tm 3 + doped fluoride modified germanate glasses are of great significance for searching efficient mid-infrared laser materials.
研究领域:
光子学
·
材料科学
·
光学材料
·
激光物理
·
稀土掺杂玻璃
·
中红外激光器
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 23
·235704
·
IF 3.5
Yanxing Wang,Wenjing Li,Yaqun Ma,Bo Hu,Xueli Chen,Ruichan Lv
In this research, a thermally activated upconversion luminescence (UCL) probe with ratiometric temperature sensing under 1064 nm and 808 nm excitation was designed. Especially, Nd3+, Tm3+ and Ce3+ were doped in rare earth nanoparticles (RENPs) as UCL modulators. By optimizing the elements and ratios, the excitation wavelength is successfully modulated to 1064 nm excitation with UCL intensity enhanced. Additionally, the prepared RENPs have a significant temperature response at 1064 nm excitation and can be used for thermochromic coatings. The intensity ratio of three-photon UCL (1064 nm excitation) to two-photon UCL (808 nm excitation) as an exponential function of temperature can be used as a ratiometric temperature detector. Therefore, this designed thermochromic coatings may enable new applications in optoelectronic device and industrial sensor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Hui Hu,Yan Bai
In this study, TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles had been successfully prepared via a hydrothermal process. All the as-prepared TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles showed the blue (476 nm), green (525 nm, 545 nm) and red (667 nm) emissions under 980 nm excitation, which were attributed to the 1 G 4 → 3 H 6 (Tm 3+ ), 2 H 11/2 , 4 S 3/2 → 4 I 15/2 (Er 3+ ) and 4 F 9/2 → 4 I 15/2 (Er 3+ ) transitions, respectively. The decay lifetime of blue, green and red emissions were 40 μs, 46 μs and 89 μs, respectively. The combination of blue, green and red emissions resulted in the white luminescence which was intense and visible to the naked eyes. The calculated CIE color coordinates of TeO 2 :Tm 3+ /Er 3+ /Yb 3+ nanoparticles fell well within the white region and changed little with the incident pump power from 1.75 W/cm 2 to 16.13 W/cm 2 , which indicated that the materials may have potential applications in the fields of three dimensional displays, back lighting, white light sources, and so on.
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 Materials Chemistry C
·
2024
·Vol. 12
·期 38
·15682-15690
·
IF 5.7
Guotao Xiang,Yuanyuan Yi,Zhen Liu,Yanhong Li,Zhiyu Yang,Yongjie Wang,Sha Jiang,Xiao Tang,Xianju Zhou,Li Li,Xiaojun Wang,Jiahua Zhang
Developing efficient photocatalysts that respond to near-infrared (NIR) light holds significant scientific importance for improving the utilization of solar energy. In this study, the photocatalyst β-NaLuF4:Yb3+/Tm3+@TiO2 that simultaneously responds to both ultraviolet (UV) and NIR light is successfully synthesized. Instead of the conventional use of β-NaYF4:Yb3+/Tm3+, β-NaLuF4:Yb3+/Tm3+ upconversion (UC) nanoparticles (NPs) are employed as the NIR-UV light converter to achieve stronger UV UC luminescence. The data indicate that the photocatalytic degradation efficiency and rate of β-NaLuF4:Yb3+/Tm3+@TiO2 synthesized in this work are superior to those of NIR-driven photocatalysts based on β-NaYF4:Yb3+/Tm3+ under both NIR and sunlight irradiation. Further analysis of the UC emission spectra and the decay curves of the samples reveals an effective fluorescence resonance energy transfer (FRET) process between β-NaLuF4:Yb3+/Tm3+ and TiO2 after the combination, which makes the NIR-driven photocatalytic reactions happen. All results confirm that the present β-NaLuF4:Yb3+/Tm3+@TiO2 is an exceptionally efficient photocatalyst, owing to its responsiveness to both UV and NIR light.
研究领域:
材料科学
·
光化学
✓ 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）