JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Rui Zhang,Xue Luo,Feiyu Zhao,Qiang Xu,Yang Xu,Yang Xu,Shuo Chen,Xianping Fan,Xvsheng Qiao
GeSe is a narrow band gap semiconductor with feasible application as infrared photoelectric devices . However, challenges are still maintained to improve their carrier concentration and conductivity for broader scope of photodetector applications. Aiming at such scope, the Ge 1- x Sn x Se (0 < x < 0.2) were synthesized via a facile “one-pot” wet chemical method and a lattice site substitution strategy. Compared to the pure GeSe micro-sheets the synthesized Ge 1- x Sn x Se micro-sheets possessed a smaller band gap (0.914 eV) and a better electrical conductivity (2.80 × 10 −5 Ω −1 cm −1 ), where the former exhibit greatly improved photo-current. The Ge 1- x Sn x Se micro-sheet was then assembled into a photodetector device to demonstrate its remarkable photo responsivities in visible to NIR spectral region (3614 A/W at 532 nm and 86 A/W at 1319 nm). The photo-detection range broadening and the responsivity enhancement can be attributed the carrier concentration increment as well as the band gap narrowing. Therefore, the Ge 1- x Sn x Se micro-sheets can be considered as an excellent candidate that can be applied as high performance photodetectors in the visible to near infrared region.
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 17
·5458-5464
·
IF 6.1
Nan Zhang,Mei Yang,Wen-Dong Yao,Wei Xu,Wenfeng Zhou,Wenlong Liu,Sheng-Ping Guo
Rational structural design and modification based on known compounds is an effective strategy to explore new nonlinear optical (NLO) materials. Here, three new rare-earth (RE) oxythiogermanates Eu18Ge9O5S31 (1), Ca3.32Eu14.68Ge9O5S31 (2) and Ba3Eu15Ge9O5S31 (3) were obtained by the novel cation and anion co-partial substitution strategy from the parent β-Eu2GeS4 (0), which induces centrosymmetric to noncentrosymmetric (NCS) structural transformation and NLO activities. They crystallize with a pseudo-zero dimensional structure in the chiral R3 space group, featuring almost linearly arranged isolated GeS4 and GeOS3 tetrahedra. Their optical band gaps were determined to be 2.18, 2.23 and 2.24 eV, respectively. 1 and 2 show balanced NLO properties with moderate second-harmonic generation (SHG) responses (0.5 and 0.6 × AGS) and high laser-induced damage thresholds (LIDTs) (3.3 × AGS). Moreover, theoretical calculations show that their NLO properties are determined by the synergistic effect of GeS4 and GeOS3 tetrahedra. This work enriches the chemistry of rarely studied RE oxychalcogenides and provides a fresh route for designing NCS structures targeting diverse applications.
研究领域:
材料科学
·
晶体学
·
光学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 18
·5709-5717
·
IF 4.478
Yu Ying,Hu Jiaju,Zhao Xinyi,Liu Jiangchuan,Gao Ying
Photochemical vapor generation (PVG) of germanium (Ge) was first reported in this work. The synergistic effect from cobalt/chloride ions and air-liquid interfaces was found for the PVG of Ge. No obvious signal response was observed from the standard solution of Ge in 10% (v/v) formic acids (FAs) under UV irradiation. The addition of 300 mg L −1 of Co 2+ and 30 mmol L −1 of Cl − resulted in enhanced photochemical reduction for Ge, and the introduction of air-liquid interfaces proceeding and succeeding the sample solution caused another 4.6 folds of enhancement in signal response of Ge. Under the selected condition, the limit of detection (LOD, 3σ, n = 11) was obtained to be 0.008 ng mL −1 with inductively coupled plasma mass spectrometry (ICP MS) measurement. A good precision, expressed as a relative standard deviation (RSD, n = 7) of 2.0%, was found from replicated measurements of 2 ng mL −1 of Ge. The generation efficiency was found to be no better than 9 ± 2%. The PVG mechanism of Ge was investigated in this work. The new finding is useful for understanding the principle of PVG, and further exploring the analytical and environmental application of PVG. Graphical abstract
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Lv,Ning Zhao,Chaofeng Li,Cunjian Lin,Shihai You
Efficient and stable persistent phosphors play a crucial role in the fields of energy storage, anti-counterfeiting, and biomedical fields. Here, we present an improved synthetic method for preparing a series of color-tunable LiYGeO 4 :Tb 3+ persistent phosphor. The increased Tb 3+ concentration in the improved method enhances the persistent luminescent intensity at 20 s by ∼2.96 times. This enhancement is due to the dual roles of Tb 3+ as both emitters and trap centers within LiYGeO 4 . By simply increasing the doping concentrations, the persistent color can be adjusted from blue to green. LiYGeO 4 :Tb 3+ exhibits no loss of persistent luminescent intensity even after exposure to water at 80 °C for 72 h, surpassing the commercial green persistent phosphor. Furthermore, information storage was successful demonstrated by using LiYGeO 4 :Tb 3+ with various doping concentrations. This study represents a significant advancement in optimizing the properties of persistent luminescent materials, where dopants simultaneously serve as emitters and trap centers.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2025
·
IF 3.3
Tingting Yan,Dinghan Jin,Dongyang Xi,Lei Sun,Linan Liu,Han Li
NaHoGeO 4 crystals were successfully synthesized under hydrothermal conditions. The crystals had petal-like morphologies with dimensions of approximately 300 μm. The crystals displayed excellent luminescent properties, appearing yellow under natural light and pale red under UV light irradiation. Compared with solid-state synthesis method, these experiments require a shorter time and can be operated at a lower temperature. To assess the structural integrity of NaHoGeO 4 and its luminescent characteristics under varying pressure conditions, a diamond anvil cell (DAC) was utilized to perform high-pressure Raman and photoluminescence (PL) spectroscopic studies. The results of high-pressure PL spectroscopy demonstrated that NaHoGeO 4 probably underwent a structural transformation into a new phase within 5.7–9.0 GPa. High-pressure Raman analysis indicated that notable alterations occurred throughout the assessed pressure spectrum, indicating that a phase transition took place. When the pressure was increased to approximately 15.0 GPa, the high-pressure phase of NaHoGeO 4 (NaHoGeO 4 -HP) remained stable. Once the pressure was reduced, the spectra reverted to their initial forms, suggesting that the phase transition could be reversed. This study provides a new approach for the study of the luminescent properties of rare-earth germanate compounds, with significant potential for practical applications.
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 SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 21
·1-13
·
IF 2.8
Su Congxue,Tao Wenlong,Chen Lianchun,Che Haiyan,Wang Ruijuan,Fan Jun,Qin Xingliu,Chen Zhilin,Fang Liang
Orthorhombic olivine-structured LiTmRO 4 (R = Si, Ge) ceramics were synthesized using a solid-state reaction. Promising microwave dielectric properties of ε r = 8.18, τ f = 13.7 ppm/°C and a high-quality factor ( Q × f ) of 24,274 GHz for LiTmSiO 4 were obtained at 1130 °C, and ε r = 8.67, τ f = − 24.4 ppm/°C and Q × f = 19,231 GHz for LiTmGeO 4 were achieved at 1090 °C. According to the bond valence results, Tm 3+ and Ge 4+ presented a compressed state, but Li + exhibited a strong rattling state in LiTmGeO 4 , which led to a higher ε r than ε theo . The integrated effect of the rattling cations (Li + and Si 4+ ) and a compressed cation (Tm 3+ ) in LiTmSiO 4 resulted in a smaller positive deviation ∆ ε r . The larger packing fraction of LiTmSiO 4 contributed to a higher Q × f than that of LiTmGeO 4 . The R–O bond in both ceramics played a leading role in influencing Q × f according to the Phillips–Van Vechten–Levine chemical bond theory.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 7
·1-7
·
IF 2.5
Xing Zhuo,Song Julong,Pan Hong,Wang Juan
A series of CaMgGe 2 O 6 ceramics doped with Zn 2+ ions were designed and fabricated using the solid-state reaction method. The impact of cation doping on sintering behavior, crystal structure, microstructure, and dielectric properties was systematically investigated. Incorporating Zn 2+ ions into the crystal structure optimized the sintering process to enhance densification. Analysis of the crystal structure revealed slight changes in lattice parameters and unit cell volume upon introduction of Zn 2+ dopants, indicating successful incorporation without significant alteration to the overall structure. Microstructural characterization revealed that increasing Zn 2+ content resulted in a finer microstructure with a more uniform grain size distribution. Furthermore, substitution of Zn 2+ effectively reduced dielectric loss in CaMgGe 2 O 6 ceramics while maintaining a stable dielectric constant, making them suitable for high-frequency applications. Among all compositions tested, CaMg 0.8 Zn 0.2 Ge 2 O 6 exhibited exceptional performance with a Q × f value reaching 64,980 GHz along with an ε r of 7.88 and τ f of -36.9 ppm/°C.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1953-1962
·
IF 2.328
Quansheng Wu,Shanshan Ye,Xufeng Zhou,Jianyan Ding
Developing narrowband red phosphors has always been a frontier topic in the phosphor community. In this study, a novel hafnium germanate red phosphor, BaHfGe 3 O 9 :Eu 3+ , was successfully synthesized by solid-state reaction method. The phase and crystal structure of BaHfGe 3 O 9 were investigated by the Rietveld refinement of powder X-ray powder diffraction. The band structure was analyzed by density functional theory calculations. Most importantly, the luminescence behavior of phosphors under near-ultraviolet (n-UV) light and cathode rays sources was studied in detail to explore the possibility of their applications in white light-emitting diodes and field emission display. The BaHfGe 3 O 9 :Eu 3+ phosphor exhibits strong f–f excitation and excellent thermal robustness due to Eu 3+ localization in the rigid lattice and asymmetric Ba 2+ sites. Under cathode rays and n-UV light excitation, BaHfGe 3 O 9 :Eu 3+ exhibits narrowband red light emission peaked at 610 nm. Moreover, BaHfGe 3 O 9 :Eu 3+ shows excellent saturation resistance and aging resistance. The performance of the LED lamp encapsulated by the BaHfGe 3 O 9 :Eu 3+ phosphor was studied. The results show that BaHfGe 3 O 9 :Eu 3+ is a potential red phosphor for multifunctional applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Zhizhen Wang,Zhen Song,Lixin Ning,Zhiguo Xia,Quanlin Liu
The Sr3SiO5:Eu2+ phosphor has attracted considerable attention for applications in white LEDs owing to its highly efficient yellow emission under violet-blue excitation. We report herein an enhancement of yellow persistent luminescence in Sr3SiO5:Eu2+ through Ge incorporation. The strongest persistent luminescence intensity is observed for Sr3(Si1–xGex)O5:Eu2+ with x = 0.005 with a peak emission wavelength at ∼580 nm and a persistent time of ∼7000 s at the 0.32 mcd/m2 threshold value after UV radiation. A combination of thermoluminescence measurements and density functional theory (DFT) calculations reveals that the afterglow enhancement is due to a significant increase in the number of oxygen vacancies that act as electron trapping centers with appropriate trap depths. This investigation is anticipated to encourage more exploration of GeSi substitution to design and improve Si-containing persistent phosphors with superior functionalities.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Qiujun Lu,Hu Dong,Jiali Hu,Linna Huang,Youyu Zhang,Mingxia Li,Meiling Liu,Yaqian Li,Cuiyan Wu,Haitao Li
Germanium quantum dots (GeQDs) show unique advantages in fluorescence applications due to their large quantum confinement effect and excellent biocompatibility. However, GeQDs are confronted with difficulty in accurately controlling the fluorescence emission. This defect brings challenges to understanding the fluorescence mechanism and limits the potential applications of GeQDs. In this paper, a series of GeQDs with the average diameter of about 2.6 nm modified with different ligands were synthesized by the chemical reduction method. The fluorescence emission of GeQDs can be changed from blue to yellow-green through adjusting the surface ligands. The influence of surface ligands on the fluorescence emission of GeQDs was thoroughly investigated by experimental and theoretical calculations. Furthermore, the synthesized GeQDs exhibit good biocompatibility and photostability and can act as high-performance fluorescence probes for long-term fluorescent bioimaging. This work provides a good and deep understanding of the fluorescence mechanism of GeQDs and will facilitate diverse promising applications of GeQDs in the near future.
研究领域:
材料科学
·
生物学
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2021
·
IF 3.626
Qiaoqi Li,Fei Wang,Xin Zhou,Jianmei Chen,Chao Tang,Lili Zhang
Herein, we reported the systematic investigation of synergistic photo-thermal-catalysis for NaBH 4 hydrolysis reaction based on zinc orthogermanate. A series of Zn 2 GeO 4 : x Fe 3+ ( x = 0 to 0.10) catalysts were prepared via solvothermal method. The H 2 evolution experiments demonstrated that the photogenerated holes trap OH − not only shifted the equilibrium of NaBH 4 hydrolysis reaction toward the direction of H 2 evolution, but also inhibited the recombination of photogenerated carriers. With the remarkable photo-thermal synergism for the as-prepared catalysts, the H 2 evolution rate in photo-thermal-driven condition had witnessed several times higher than that in mono-energy driven condition. The catalysts remained stable after circulation tests.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 11
·3574-3585
·
IF 2.657
X. Y. Liu,H. Guo,S. X. Dai,M. Y. Peng,Q. Y. Zhang
In this paper, novel Bi3+/Eu3+ co-doped white-emitting germanium-borate glasses were successfully prepared by the melt-quenching method. Their luminescent properties were evaluated using the transmission spectra, photoluminescence excitation, and emission spectra (with a temperature range of 298-573 K), and lifetime decay curves. Due to the efficient energy transfer from Bi3+ to Eu3+, tunable emitting color between the bluish-green and the orange-red region has been obtained by varying the content of Eu3+ (0-7%). Interestingly, a perfect white-light emission with CIE coordinates (X = 0.356, Y = 0.325) is realized upon the excitation at 345 nm light in the Bi3+/Eu3+ co-doped sample. More remarkably, the white-light emission glass maintains excellent color stability even at 423 K. Our results indicate that the Bi3+/Eu3+ co-doped germanium-borate glasses may be used as a potential single-phased white light-emitting matrix material for the UV converted organic-resin-free WLEDs in the future.
研究领域:
材料科学
·
光学
✓ 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）