Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·19022-19027
·
IF 11.301
Hui Ma,Haoge Cheng,Xinlei Ma,Sen Wang,Zhuqing Zhou,Yuqiao Chai,Ruoqi Chen,Xinyue Zhang,Yonglin He,Yapei Wang,Yan Li,Xusheng Wang,Rui Li,Ning Ma,Mianqi Xue
Charge/light-related advancements have greatly pushed the development of modern technology, and the relationship between charge and light is worth exploring. While research into the applications of light and charge flow (photoelectric current) is in full swing, studies on the reaction between light and electrostatic charge have made little progress on rare ways to realize photo-stimulated discharge. Herein, we link electrostatic charge and light using a bridge of intense heat, which is produced from the efficient photothermal conversion of Ti3C2Tx MXene. The in situ photothermal conversion and selective thermally stimulated discharge are successfully combined, then novel light-induced electrostatic lithography can be realized on both polymethyl methacrylate glasses and nanofilms. In this process the surface temperature of Ti3C2Tx film can be as high as 300 °C using 808 nm near-infrared irradiation at a power density of 1.7 W cm−2. The combination of light and electrostatic charge is also successfully applied to electrostatic printing and chemical reactions.
研究领域:
材料科学
·
光子学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 35
·期 5
·823-834
·
IF 1.09
Wu Xiao-ran,Xue Xiang,Wang Jing-hang,Liu He-wen
Smart functional microgels hold great potential in a variety of applications, especially in drug transportation. However, current drug carriers based on physiological internal stimuli cannot efficiently orientate to designated locations. Therefore, it is necessary to introduce the self-propelled particles to the drug release of the microgels. In order to study self-propulsion of microgels induced by light, it is also a challenge to prepare micronsized microgels so that they can be observed directly under optical microscopes. In this work, phototactic microgels with photoresponsive properties are prepared. The microgel particles can be observed by confocal laser scanning microscopy. The photoresponsive properties of microgels are fully investigated by various instruments. Light can also regulate the state of the microgel solution, making it switch between turbidity and clarity. The phototaxis of particles irradiated by UV light was studied, which may be used for microgels enrichment and drug transportation and release.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Jiansheng Huang,Ronghui Liu,Yuanhong Liu,Yunshen Hu,Guantong Chen,Chunpei Yan,Junhang Tian,Bin Hu
Eu 2+ activated BaSi 2 O 2 N 2 oxynitride bluish-green phosphor was synthesized adopting conventional high-temperature solid-state reaction method, in which BaF 2 , Na 2 CO 3 and NH 4 Cl were used as the fluxes. The phase formation, size distribution and microscopic morphology were characterized to investigate the influence of adding fluxes on photoluminescence properties. The results indicate that with the addition of BaF 2 flux, the particle morphology becomes regular and size distribution narrows and the phase purity of BaSi 2 O 2 N 2 :Eu 2+ phosphor can be improved effectively. The photoluminescence intensity of BaSi 2 O 2 N 2 :Eu 2+ phosphor with BaF 2 as flux gets enhanced obviously, which is much higher than that of Na 2 CO 3 , NH 4 Cl and without flux. The optimum content of BaF 2 flux is 4 wt%, and the maximum photoluminescence intensity of the BaSi 2 O 2 N 2 :Eu 2+ phosphor prepared with BaF 2 flux rises to 141%, meanwhile, the phosphors with BaF 2 flux exhibits low thermal quenching. The results indicate that the BaSi 2 O 2 N 2 :Eu 2+ is sort of promising bluish-green phosphor for application in full-spectra LED.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Rong Zhuang,Bijun Fang,Shuai Zhang,Xiaolong Lu,Jianning Ding
A series of [(Ba (1-0.3y) Ca 0.3y ) 1-x Sm x ][Ti (0.8+0.2y) Hf (0.2-0.2y) ]O 3 (Sm 3+ -doped (1-y)Ba(Ti 0.8 Hf 0.2 )O 3 -y(Ba 0.7 Ca 0.3 )TiO 3 , abbreviated as Sm 3+ -doped BCTH, or (1-y)BHT-yBCT:xSm 3+ , x = 0.0005–0.03, y = 0.2–0.7, y representing the mole fraction of (Ba 0.7 Ca 0.3 )TiO 3 ) nano phosphors were prepared by a hydrothermal method . The Sm 3+ ions doping amount and triple-point morphotropic phase boundary (TMPB) composition dependent photoluminescence properties were systematically investigated. The hydrothermal synthesized powders present rather pure pseudo-cubic perovskite phase structure at room temperature and locate on the rhombohedral side of MPB. Under the excitation of 409 nm light, the powders exhibit dominant orange-red emission peaks with characteristic emission of the Sm 3+ ions at around 564 nm, 596 nm, 644 nm, and 703 nm, relating to the transitions of 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 and 6 H 11/2 , respectively. The BHT-0.5BCT:0.005Sm 3+ powder exhibits optimal emission in these Sm 3+ -doped BCTH powders. Furthermore, the phase transition temperature can be characterized by the multi-feature changes of the temperature dependent fluorescence intensity.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 6
·2721-2729
·
IF 3.784
Xianju Zhou,Jie Zhang,Lingni Chen,Yanhong Li,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Zhongmin Cao,Guangxin Xie
A series of novel red emission phosphors Sr 3 Lu 1- x (VO 4 ) 3 : x Eu 3+ ( x = 0.007, 0.009, 0.02, 0.04, 0.06) were synthesized successfully by traditional high-temperature solid-state reaction. The results of X-ray diffraction (XRD) reveal the doped Eu 3+ ions have replaced the lattice sites of Lu 3+ ions. The diffuse reflectance spectra illustrate the energy gap of Sr 3 Lu(VO 4 ) 3 host is 3.61 eV. The room-temperature steady-state fluorescence spectra show that these phosphors can be effectively pumped by the charge-transfer band (CTB) of the host in near ultraviolet (NUV) spectral region and then produce strong and pure red emission at 615 nm originated from 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The Commission Internationale de L’Eclairage (CIE) coordinates of Sr 3 Lu 0.96 (VO 4 ) 3 :0.04Eu 3+ are (x = 0.65, y = 0.35), which are very close to the red standard of National Television Standards Committee NTSC (0.67, 0.33). The fabricated warm white-light-emitting diodes (LED) demonstrate high color-rendering index Ra as 93. The results imply the red-emitting Sr 3 Lu(VO 4 ) 3 :Eu 3+ phosphors could be potentially utilized in the fields of solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Gongcheng Xing,Mengxuan Tao,Zhiyu Gao,Shuoting Chen,Song Wang,Guogang Li
In this work, two component substitution types of Si 4+ →[Cs + -Al 3+ ] and [Mg 2+ -Mg 2+ ]→[Cs + -Al 3+ ] were successfully designed in Eu 2+ -doped CsAlSi 2 O 6 pollucite phosphors. The photoluminescence color can be controllably tuned from cyan (513 nm) to blue (437 nm), and full width at half maximum (FWHM) can be adjusted in the region of 79–169 nm. Besides, the thermal stability is obviously improved, where PL intensity at 200 °C increases from 59% (CsAlSi 2 O 6 :5%Eu 2+ ) of the original intensity to 96% [(CsAl) 0.6 Mg 0.8 Si 2 O 6 :5%Eu 2+ ] and 86% [(CsAl) 0.9 Si 2.1 O 6 :5%Eu 2+ ], respectively. The corresponding mechanisms of spectral adjustment and thermal stability enhancement were investigated. The proposed strategies can play a key role in exploiting novel and efficient phosphors for high-power w-LEDs lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 34
·12101-12108
·
IF 3.806
Zhuo Wang,Jing Feng,Min Pang,Shunhao Pan,Hongjie Zhang
In this paper, uniform rice-shaped lanthanide doped BiPO4 upconversion submicron particles have been successfully synthesized via a facile room-temperature co-precipitation reaction and subsequent calcination route. The morphology, phase transformation and upconversion luminescent properties of synthesized submicron particles (SMPs) were characterized by using different analytical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC) and upconversion luminescence (UCL) spectra. The transformation from hexagonal phase to monoclinic phase is crucial for upconversion luminescent properties due to the loss of water molecules in the lattice of hexagonal phase. With different variety and concentration of the dopant Ln3+ (Ln = Yb, Er, Tm and Ho) ions, the obtained samples present bright green, blue, and red upconversion emissions under a 980 nm continual wave laser diode excitation. Multicolor and bright white upconversion emissions have also been obtained by precisely adjusting the dopants concentration in the host lattice.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Haiyue Yang,Yushan Liu,Jian Li,Chengyu Wang,Yudong Li
Due to its unique structure and component, wood is widely used as matrix to develop functional composites. However, the lignin is removed from wood and thrown away as waste in most wood-based functional composites. In this work, a new strategy of “taken from the wood, back into the wood” to fabricate a full-wood photoluminescent and photothermic material is proposed. By facile delignification and solvothermal process, the delignified wood (DW) and carbon quantum dots (CQDs) derived from removal lignin are prepared. In addition, compared with other CQDs excited by UV light, the CQDs possess red (650 nm) and NIR (710 nm) emission light under visible light excitation (580 nm). Most importantly, the heat radiated from NIR emission could be stored by the introduced phase change materials (PCM) to adjust ambient temperature. The composite owns photoluminescent, photothermic and energy storage property (heat latent of 137.6 J/g), which is environmentally friendly, green and creative. The all-new technique for functional wood composite shows potential for application in energy-saving and optical devices.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 27
·期 1
·85
·
IF 4.412
Long Chen,Cuiyu Wu,Zheng Xie,Chenghua Sun,Shuyun Zhou
With the advancement of ultra-fast and high-energy pulsed laser output, lasers have caused serious harm to precision instruments and human eyes. Therefore, the development of optical limiting materials with a fast response, low optical limiting threshold, and high damage threshold are important. In this work, for the first time, it is reported that phosphors Gd2O2S:Tb3+(GOS) displays exceptional functionality in laser protection. GOS with sizes of 11 μm, 1 μm, and 0.45 μm are prepared. Based on the optical limiting and Z-scan technology systems under 532 nm and 1064 nm nanosecond laser excitation, the nonlinear optical properties of GOS are investigated. It is found that GOS exhibits outstanding optical limiting properties. In addition, the optical limiting response of GOS is size-dependent. Concerning the largest particle size, GOS has the best nonlinear optical response, while the precursor shows no nonlinear optical performance. Meanwhile, GOS doped gel glass also displays excellent optical limiting properties with high transmittance, which preliminarily validates the application of GOS and other scintillators in nonlinear optics and encourages more research to better realize the potential of GOS.Keywords:scintillator;nonlinear optics;optical limiting;size-dependent
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
SocMan Ho-Kimura
Photoactivated bismuth vanadate (BiVO4) anodes are highly promising candidates for solar-driven water splitting. Extant research has shown that prolonged light exposure results in the formation of a borate cocatalyst junction layer on the BiVO4 anode surface, which is attributable to the photocorrosion of BiVO4 and etching modification in a borate electrolyte; consequently, the photocurrent is significantly increased. This study analyzes the effects of light alone on photoactivated BiVO4 anodes in the absence of the borate cocatalyst. We utilized photocorrosion- and etching-resistant BiVO4 to prevent formation of the borate cocatalyst overlayer and investigated the effects of short-duration light irradiation on the photoelectrochemical (PEC) properties. Remarkably, we observed that pretreatment with a mere 20 min of light exposure in both air and electrolyte resulted in a notable increase in the photocurrent. In addition, this photoactivation effect recurred via repeated light irradiation and dark storage. The PEC technique was used to show that the intraband gap states reduced after photoactivation, and hole accumulation increased on the photoactivated BiVO4 surface during the subsequent water oxidation reaction. Furthermore, the spectroelectrochemical spectra revealed that the hole-trapping absorbance of photoactivated BiVO4 decreased. Photoincident absorption spectroscopy and transient absorption spectroscopy further showed an increased population of the photogenerated holes and an extended lifetime on the microsecond time scale, respectively, which contributed to improved PEC water-splitting activity with the photoactivated BiVO4. These findings are expected to offer deeper insights into the trap-filling mechanism underlying BiVO4 photoactivation and its effect on PEC water splitting.
研究领域:
材料科学
·
能源转换
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-11
·
IF 2.8
Chen Yonglin,Wu Haoyi,Li Yanmei,Liu Zhenpeng,Wan Jiangyun,Hu Yihua
A series of novel orange-red emitting tantalate phosphors, Sr 2 Ta 2 O 7 :xEu 3+ (0.01 ≤ × ≤ 0.13) were successfully prepared through the solid-state method at high temperature. Under the excitation of 464 nm, Sr 2 Ta 2 O 7 :Eu 3+ emits orange-red light at 597 nm. The PL spectra of Sr 2 Ta 2 O 7 :Eu 3+ phosphors are ascribed to the 5 D 0 → 7 F J ( J = 0, 1, 2, 3 and 4) transitions of Eu 3+ ions. The optimal doping concentration of Eu 3+ ions was 9 mol%. The optical bandgap of the host was calculated by ultraviolet-visible diffuse reflection spectra (DRS) with a value of 4.73 eV. The emission intensity of phosphors at 423 K still maintains 92% of that at room temperature, which means the material has excellent thermal stability. The chromaticity coordinates of the Sr 2 Ta 2 O 7 :Eu 3+ located in the orange-red region (0.6403, 0.3585). Various results show that Eu 3+ -doped Sr 2 Ta 2 O 7 phosphors have great potential in the field of phosphor conversion white light-emitting diodes (pc-WLEDs).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 6
·2102373
·
IF 10.05
Zhiyu Yang,Gaochao Liu,Yifei Zhao,Yayun Zhou,Jianwei Qiao,Maxim S. Molokeev,Hendrik C. Swart,Zhiguo Xia
The discovery of Eu 2+ -doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu 3+ to Eu 2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO 4 :Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH 4 ) 2 SO 4 -assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu 2+ prefers to occupy the Sr 2+ sites in the SrLaScO 4 enabling red emission, and a competitive site occupation of Eu 3+ in La 3+ can be restrained, and the reduction mechanism of Eu 3+ to Eu 2+ originating from the (NH 4 ) 2 SO 4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO 4 :Eu and yellow-emitting Y 3 (Al,Ga) 5 O 12 :Ce 3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu 2+ -doped red phosphor for WLED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）