MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Tengchao Guo,Guoyue Xu,Shujuan Tan,Ning Liu,Jianchao Zhang,Xiangxiong Zeng,Juan Liang
The electronic properties and infrared emissivity of Zn 1-x Mg x O (x = 0, 0.0625, 0.125) were systematically investigated by using the first-principle calculation s based on density functional theory (DFT). The Zn 1-x Mg x O (x = 0, 0.0625, 0.125) powders were prepared by sol-gel method and their infrared emissivity in the wavelength of 8–14 μm was characterized. The results indicate that the infrared emissivity increases with the increase in Mg concentration, which is attributed to the reduction in conductivity and in the real part of dielectric function. Furthermore, the variation in conductivity and dielectric function has been well studied, and a reasonable method to calculate infrared emissivity of semiconductors has been established. It is expected that this method can be used for designing materials with different infrared emissivity and also applied for effectively guiding the experimental investigation.
研究领域:
材料科学
·
凝聚态物理
·
计算材料学
·
功能材料
·
半导体物理
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Zhiyong Mao,Jingjing Chen,Liang Sun,Qifei Lu,Dajian Wang
(Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphors with 430/505/660 nm tri-bands or 430/660 nm dual-bands emission were demonstrated in this work by controlling the appearence or not of green emitting intermediate phases, (Ba,Sr) 2 SiO 4 :Eu 2+ . Through varying the stoichiometric amount of SiO 2 in precursor, the coexistence of green emitting intermediate phase tended to be sensitive and diversified. Laser Microzone Raman spectrum was employed to look insight into the lattice stretch and the preferential occupation sites of Ba 2+ ions in Sr 3 MgSi 2 O 8 lattices. The local structure and the crystal field of Eu 2+ luminescent centers were found to be disturbed by distorted arrangement of cross-linked [MgO 6 ] octahedra and [SiO 4 ] tetrahedra. This mechanism approach provided some new insights to further understanding the adjustment strategy of green emitting intermediate phases in (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor potentially applied as red/blue dual-bands emitting or red/green/blue tri-bands emitting materials.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固体物理
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 16
·11563-11568
·
IF 2.019
Sun Xinjie,Tong Hua,Yuan Xiao,Liu Cui,Yuan Shuanglong,Chen Guorong,Yang Yunxia
Thermal boron diffusion, which forms highly doped and shallow p-emitters on phosphor-doped silicon wafers, is one of the primary processes in commercial-scale production of n-type cells. Here, we report on the use of nontoxic and nonvolatile borosiloxane sols as the spin-on boron source. In comparison to the tribromide (BBr 3 ) boron diffusion that is applied in the production of most commercial n-type cells, borosiloxane boron diffusion may have potential advantages in terms of cost, safety, operability, etc. The borosiloxane sols studied here were formed from a cross-linking reaction between boron acid and a mixture of two types of silicon alkoxides, methyltriethoxysilane (MTEOS) and dimethyldiethoxysilane (DMDEOS). The MTEOS/DMDEOS ratio was found to be the key factor determining the synthetic period, net structure, thermal transformation property, and coating behavior of the borosiloxane sols. In combination with the spin-coating method, the performance of borosiloxane boron diffusion into phosphor-doped silicon wafers (1–3 Ω·cm) was systematically investigated by varying the borosiloxane composition (boron/silicon or MTEOS/DMDEOS ratio) and the diffusion process parameters (temperature, ambience, and period of individual sub-steps), and by relating them to the resulting sheet resistance and boron doping profile. The results show that under the diffusion conditions in conventional cell production lines, the formed p-emitters can have variable sheet resistance in the range of 35–582 Ω/□ and boron doping depth of 100–300 nm.
研究领域:
材料科学
·
半导体物理
·
光伏技术
·
表面工程
·
纳米材料
·
化学气相沉积
·
微电子学
✓ 已验证
DOI
高影响因子
Advanced Physics Research
·
2022
·Vol. 2
·期 4
·2200056
·
IF 0
Kuangnan Lyu,Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr 3+ -doped AlNbO 4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr 3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr 3+ emitters in different Al 3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO 4 :Cr 3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr 3+ -doped AlNbO 4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
研究领域:
光学材料
·
生物医学光学
·
光电子学
·
无机功能材料
·
分子影像
✓ 已验证
DOI
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yuzhen Wang,Yanbin Li,Chaoyang Ma,Zicheng Wen,Xuanyi Yuan,Yongge Cao
In this study, NaYTiO 4 : Yb/Tm phosphors with different concentrations of Yb 3+ and Tm 3+ ions were synthesized by conventional solid-state reaction. Upon a 980 nm laser excitation, the up-conversion luminescence properties in a wide temperature range (303–823 K) were investigated. By employing the fluorescence intensity ratio (FIR) techniques based on the robust near-infrared emissions of thermally coupled 3 F 2,3 / 3 H 4 energy levels and 3 H 4(1) / 3 H 4(2) Stark energy levels, the calculated absolute sensitivity (S a ), relative sensitivity (S r ), and temperature uncertainty (δT) values demonstrated good temperature sensing properties. For the 3 F 2,3 / 3 H 4 energy levels, the maximum S r and minimum δT values are 1.04% K −1 and 0.010 K at 463 K, respectively. Moreover, the maximum S a is 0.32 × 10 −3 K −1 at 823 K. In addition, the thermally coupled 3 H 4 Stark energy levels present the maximum S a , S r and the minimum δT are 0.88 × 10 −3 K −1 , 0.60% K −1 and 3.17 K at 303 K, respectively. Besides, due to the ratio of blue to red emission varying with elevated temperature, the NaYTiO 4 : Yb/Tm phosphors are expected to be applied as an intuitive high-temperature indicator.
研究领域:
材料科学
·
光学材料
·
传感器技术
·
固体化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Xiang Shen,Bing Yan
A series of luminescent Ln 3+ @bio-MOF-1 (Ln = Eu, Tb, bio-MOF-1 = Zn 8 (ad) 4 (BPDC) 6 O⋅2Me 2 NH 2 (ad = adeninate, BPDC = biphenyldicarboxylate)) are synthesized via postsynthetic cation exchange by encapsulating lanthanide ions into an anionic metal–organic framework (MOF), and their photophysical properties are studied. After loading 2-thenoyltrifluroacetone (TTA) as sensitized ligand by a gas diffusion (“ship-in-bottle”) method, it is found that the luminescent intensity of Eu 3+ is enhanced. Especially, when loading two different lanthanide cations into bio-MOF-1, the luminescent color can be tuned to close white (light pink) light output. Additionally, bio-MOF-1 and Eu 3+ @bio-MOF-1 are selected as representative samples for sensing metal ions . When bio-MOF-1 is immersed in the aqueous solutions of different metal ions , it shows highly sensitive sensing for Fe 3+ as well as Eu 3+ @bio-MOF-1 immersed in the DMF solutions of different metal ion. The results are benefit for the further application of functionalized bio-MOFs in practical fields.
研究领域:
无机化学
·
材料科学
·
分析化学
·
纳米生物技术
·
光物理学
·
配位化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Zhou,Wanglong Mao,Pingyang Huang,Xiong Huang,Haoyuan Xu,Bo Wu,Xiaofang Jiang,Xiangtao Chen,Hanyu Liu,Guofu Zhou,Jinyou Xu
This study introduces a facile method for the controlled growth of addressable planar arrays of highly luminescent, catalyst-free 1,4-bis(5-phenyloxazol-2-yl)benzene (POPOP) nanowires. By employing a hollow mask over a faceted sapphire substrate, simultaneous control over the position and orientation of the nanowires is achieved through a mask-confined graphoepitaxial growth, offering substantial advantages over traditional post-growth assembly techniques. High-temperature annealing creates parallel nanogrooves on the sapphire surface, inducing a graphoepitaxial effect that aligns the nanowires with a consistent [102] crystallographic axis. The hollow mask further aids in precisely localizing nanowire growth through its shadowing effect. Optoelectronic investigations reveal that these nanowires emit intense and stable blue photoluminescence at room temperature, with a broad spectrum spanning from 400 to 600 nm. This luminescence is achieved through excitation by continuous-wave ultraviolet light or two-photon absorption using femtosecond infrared light. Notably, the emission quantum efficiency of POPOP nanowires reaches 59 %, a remarkable improvement over the 12 % observed in powder counterparts when excited with 405 nm light. Transit absorption spectra indicate that ground state bleaching and excited state absorption display consistent kinetics within a 100 ps time window, suggesting the same origin from singlet excitons. The precise alignment and positioning of these nanowires make them viable for in-situ integration into photodetectors with rapid ultraviolet light responses. This study advances the controlled growth of catalyst-free nanowire arrays and enhances the understanding of the optoelectronic properties of POPOP nanowires.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
凝聚态物理
·
表面科学
·
有机半导体
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Qinghua Yang,Benxue Jiang,Shuilin Chen,Yiguang Jiang,Pande Zhang,Jun Wang,Shiqing Xu,Long Zhang
Al 2 O 3 : Er 3+ /Yb 3+ transparent ceramics codoped with Zn 2+ ions with intense upconversion and near infrared emission were prepared by conventional solid-state reaction and vacuum and hot isostatic pressing sintering. The effects of Zn 2+ incorporation to the structure, transparent, upconversion and NIR luminescence were discussed in detail. The as prepared Al 2 O 3 ceramics exhibited a total transmittance of ~ 75% in infrared regions (800–3300 nm) and ~ 50% in visible regions (500–800 nm). Under the excitation of a 980 nm laser diode , the as prepared Al 2 O 3 ceramics displayed two tense upconversion emission peaks of a green one centered at 550 nm and a red one centered at 660 nm and a tense near infrared emission peak centered at 1.532 µm, characteristic of Er 3+ emission. Compared with Er 3+ /Yb 3+ doped only, Zn 2+ codoped Al 2 O 3 :Er 3+ /Yb 3+ transparent ceramics showed higher upconversion and near infrared emission of ~ 11 times and ~ 4 times, respectively. The enhancement mechanism due to incorporation of Zn 2+ ions was also discussed in detail.
研究领域:
材料科学
·
光学材料
·
无机非金属材料
·
发光材料
·
陶瓷工程
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2016
·
IF 1.879
Rong Chen,Ying Tian,Bingpeng Li,Feifei Huang,Caizhi Wang,Xufeng Jing,Junjie Zhang,Shiqing Xu
Nd 3+ /Ho 3+ co-doped silicate-germanate glass has been synthesized by high temperature melt-quenching method. Near infrared emission centered at 2 µm has been successfully obtained by incorporating Nd 3+ and Ho 3+ in present glass. The Judd-Ofelt intensity parameters Ω t (t=2, 4, 6), and radiative properties of Ho 3+ were calculated and discussed by using the Judd-Ofelt theory. The energy transfer processes and luminescence properties of Nd 3+ /Ho 3+ co-doped glasses were analyzed pumped by a conventional 808 nm laser diode . Desirable spectroscopic characteristics indicates that Nd 3+ /Ho 3+ co-doped silicate-germanate glass might be a good alternative matrix for 2 µm band mid-infrared laser.
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
激光技术
·
固体物理
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 17
·期 12
·2300476
·
IF 11
Wenhai Sun,Xiang Zhang,Hulin Zhang,Zichen Ren,Mingjun Chen,Yingjun Xiao,Zitong Li,Jianbo Deng,Dukang Yan,Leipeng Zhang,Yao Li
The development of electrochromic devices (ECDs) that can dynamically modulate infrared (IR) emissivity while maintaining a wide color gamut distribution for visible (VIS)-IR compatible spectral manipulation has been a long-standing challenge. Current ECDs are limited by simultaneous changes in IR emissivity and VIS colors when subjected to external potential, restricting their potential applications. This work presents, for the first time, VIS–IR compatible ECDs capable of displaying VIS multicolor and dynamically modulating IR emissivity via a Ge/HfO 2 Fabry–Perot cavity structure. The all-solid-state VIS-IR compatible ECD with the structure of ITO/NiO/Ta 2 O 5 /Li/WO 3 /ITO/Ge/HfO 2 achieves not only emissivity modulation of 0.20 at potentials of −2.5 V and +2.5 V in the wavelength range of 2.5–25 µm, but also, due to the presence of Fabry–Perot cavity, the novelty compatible device structure achieves static multicolor modulation, thus decoupling VIS and IR emissivity modulation. Additionally, a flexible VIS-IR compatible ECD based on polyaniline is also constructed. This novel approach offers a promising possibility for multispectral compatible manipulation, VIS multicolor, and IR signal processing applications.
研究领域:
材料科学
·
光学工程
·
纳米光子学
·
功能材料
·
智能器件
·
表面物理
·
能源材料
✓ 已验证
DOI
高影响因子
Advances in Materials Science and Engineering
·
2018
·Vol. 2018
·期 1
·7252809
·
IF 1.372
Van-Tuan Mai,Quang-Bac Hoang,Xuan-Dung Mai
Cost-effective methods for preparing ZnO nanostructures are of importance for the deployment of ZnO in many applications including n-type conduits, catalysts, nanophosphor, and optoelectronics. Herein, we present a room-temperature sol-gel method with the aid of ultrasonication to prepare white-emitting ZnO nanoparticles (NPs). X-ray diffraction and electron microscopic analyses revealed that the size and shape of ZnO NPs can be controlled simply by changing the concentration of the Zn precursor. The ZnO NPs had a broad photoluminescence emission, ranging from 450 nm to 800 nm, while their composite in PMMA matrix showed an enhancement in the red region induced by ZnO-PMMA interfacial band-bending effects. The results demonstrated herein promise a simple tool for control over size, shape, and emission of ZnO materials for diverse applications.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
高分子化学
·
发光材料
✓ 已验证
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 4
·1700471
·
IF 4.384
Shanliang Song,Chuanxi Wang,Yue Zhao,Tantan Hu,Xinxin Zhou,Tianxin Zhao,Minghui Yang,Quan Lin
A dual-emission ratiometric fluorescent sensing film for metal ion detection is designed. This dual-emission film is successfully prepared from chitosan, graphitic carbon nitride (g-C 3 N 4 ), and gold nanoclusters (Au NCs). Here, it is shown that the g-C 3 N 4 not only serves as the fluorescence emission source, but also enhances the mechanical and thermal stability of the film. Meanwhile, the Au NCs are adsorbed on the surface of chitosan film by the electrostatic interaction. The as-prepared dual-emission film can selectively detect Cu 2+ , leading to the quench of red fluorescence of Au NCs, whereas the blue fluorescence from g-C 3 N 4 persists. The ratio of the two fluorescence intensities depends on the Cu 2+ concentration and the fluorescence color changes from orange red to yellow, cyan, and finally to blue with increasing Cu 2+ concentration. Thus, the as-prepared dual-emission film can be worked as ratiometric sensing paper for Cu 2+ detection. Furthermore, the film shows high sensitivity and selectivity, with low limit of detection (LOD) (10 ppb). It is observed that this novel gold-cluster-based dual-emission ratiometric fluorescent sensing paper is an easy and convenient way for detecting metal ions. It is believed that this research work have created another avenue for the detection of metal ions in the environment.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
·
生物传感器
·
环境监测
·
分子探针
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）