Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 18
·7049-7057
·
IF 8.067
Yingyuan Chen,Feilong Liu,Ziwang Zhang,Junyu Hong,Maxim S. Molokeev,Ivan A. Bobrikov,Jianxin Shi,Jianbang Zhou,Mingmei Wu
Red-light-emitting materials, as pivotal components of warm white light-emitting diodes (WLEDs), have drawn increasing public focus. Among these, Mn4+-doped red light-emitting fluorides have drawn considerable attention when combined with an InGaN chip; however, they suffer from poor water stability under humid conditions. In this work, a novel fluoride red phosphor, Cs30(Nb2O2F9)9(OH)3·H2O:xMn4+ (CNOFM), with good water resistance was synthesized for the first time using a facile co-precipitation method at ambient temperature. Experiments were implemented for the precise analysis of its crystal structure, optical properties, micro-morphology, thermal behavior, and waterproof properties. 6.66% Mn4+-doped CNOFM maintained a stable crystal structure and possessed strong PL intensity located at 633 nm with high color purity of 96%. CNOFM showed better thermal and waterproof stability compared with the commercial K2SiF6:Mn4+ red phosphor. Without any surface modifications, the PL intensity remained at about 83% of the initial value after immersion in water for 60 min, and the mechanism was investigated. Finally, a warm WLED with a CRI of 92.3 and CCT of 3271 K was fabricated using the CNOFM red phosphor.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 29
·13119-13125
·
IF 2.7
Xueyan Wu,Na Li,Chenxi Zhang,Yan Lv,Jixi Guo
Solid-state near-infrared (NIR) luminescence fluorophores have attracted much attention due to their potential in bio applications and advanced optical devices. Therefore, it is essential to design and synthesize novel NIR AIE fluorophores and investigate their structure–activity relationships for applications. Here, we synthesized two NIR AIE o-carborane fluorophores with donor–acceptor–donor (D–A–D) structures. These fluorophores have emissions extending into the NIR region and are named CPO and CPS with phenoxazine (PXZ) and phenothiazine (PTZ) derivatives as the electron donors, respectively. Despite the very similar chemical structures of PXZ and PTZ, CPO and CPS exhibited rather different photophysical properties. The o-carborane fluorophores CPO and CPS show large Stokes shifts (>14 000 cm−1), near-infrared AIE characteristics, and self-recovering mechanochromic luminescence. The reorganization of the molecular structures in the excited state leads to the planarization of their conjugated backbones and enhances the Stokes shifts. This work not only demonstrates an efficient strategy for constructing organic NIR AIE o-carborane-containing fluorophores, but also indicates their promising potential as advanced optoelectronic materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 10
·1425
·
IF 2.67
Zijie Xiao,Tingting Tao,Jingting Shu,Wei Dang,Shusheng Pan,Wei Zhang
Studying the carrier recombination process in MAPb(Br1−yIy)3single crystals (SCs) is important for its application in the optoelectronic field. In this work, a series of MAPb(Br1−yIy)3SCs with varied Br/I compositions have been studied. Steady-state photoluminescence (PL) spectra, time-resolved photoluminescence (TRPL) spectra and time-resolved microwave photoconductivity (TRMC) were used to understand the radiative and non-radiative recombination processes of MAPb(Br1−yIy)3SCs. By comparing the dynamics of TRPL and TRMC, we conclude that the dynamics of TRPL is dominated by the electron trapping process, which is in accordance with the fast decay component of TRMC kinetics, whereas the slower decay component in TRMC is dominated by the hole trapping process. Moreover, we find both the electron and hole trapping rates in mixed-halide perovskite MAPb(Br1−yIy)3(0 < y < 1) SCs are higher than that of mono-halide perovskite MAPbBr3SCs and MAPbI3SCs. This suggests mixed-halide crystals could introduce additional electron and hole trapping densities, which could be related to the fluctuation of Br/I compositions in the crystals. This work is helpful for understanding carrier recombination process in mixed-halide perovskite SCs.
研究领域:
材料科学
·
光学
·
半导体物理
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yuchao Fu,Wanxiang Li,Haochen Li,Meizhen Huang
Electro-Fenton (EF) process is a significant water treatment method for the degradation of dissolved organic matter (DOM) in water and has been widely studied and applied in the past decade to degrade various dissolved organics. During water treatment , in order to monitor the degradation efficiency, it is in dire need to develop rapid and accurate methods that are favorable to assay on-line and on-site to provide feedback in a timely manner. UV–Visible absorption spectroscopy and Excitation-Emission Matrix (EEM) fluorescence spectroscopy techniques are most potential to realize on-line DOM measurement, but the measurement accuracy is unsatisfactory because of the obligatory involvement of iron-containing interferents. This study aims to simplify the measurement system complexity while overcoming the effect of iron-containing interferents during the measurement. An intrinsic relationship between the measured DOM concentration and the ultraviolet absorption at λ 1 and the light intensities of the fluorescence emission at λ 2 is derived theoretically and proved, based on which the influence of iron ions and their complexes on the spectrum can be eliminated, thus the content of DOM in the Electro-Fenton process is accurately determined. The proposed dual wavelength analysis with combination of fluorescence emission and ultraviolet absorption spectroscopy can achieve high precision ( R 2 = 0.9882 , R M S E = 0.0131 m g / L ). Furthermore, the on-line measurement design, called ultraviolet absorption-fluorescence emission dual wavelength analyzer, only includes one ultraviolet LED and two photodetectors. Its structure is simple and suitable for on-line monitoring DOM in EF process.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 4
·1486-1497
·
IF 3.5
Wang Chuilei,Huan Yu,Hou Limin,Liu Yilong,Wang Xinjian,Zhu Ruping,Wei Tao
The influence of Nd dopant on the photoelectric properties of 0.94Na 0.5 Bi 0.5 TiO 3 –0.06BaNi 0.5 Ti 0.5 O 3 – x Nd ceramics were systematically investigated in this work. As the Nd 3+ increases, the grain size gradually decreases and the crystal structure transforms from orthorhombic to tetragonal phase. Meanwhile, the dielectric constant and Curie temperature of ceramics gradually decrease, accompanied by the enhanced dielectric relaxation. The decreasing grain size and relatively strong ferroelectric properties facilitate the separation of photogenerated charge carriers. Optical absorption spectra indicate the enhanced absorption over a wider spectral range with a decrease optical band gap from 3.18 to 2.81 eV caused by Nd 3+ doping. The photocurrent density improves from 44 nA/cm 2 for the undoped sample to 105 nA/cm 2 for x = 0.05 sample under AM1.5 standard sunlight after 40 kV/cm high-electric-field polarizing. This result demonstrates that the Nd doped NBT–BNT ferroelectric ceramics have high potential for the application in next-generation solar cells. Graphical abstract
研究领域:
材料科学
·
固体物理
·
光电子学
·
陶瓷材料
·
光伏技术
✓ 已验证
DOI
高影响因子
Solar RRL
·
2017
·Vol. 1
·期 10
·1700084
·
IF 0
Yuehui Lu,Zhicheng Chen,Ling Ai,Xianpeng Zhang,Jing Zhang,Jia Li,Weiyan Wang,Ruiqin Tan,Ning Dai,Weijie Song
Photovoltaic (PV) modules are not only an opto-electrical system, but also opto-thermal one, where the optical, electrical, and thermodynamic domains are strongly coupled. The means to suppress both light and heat losses in PV modules remains undeveloped. Herein, a universal route to realize both radiative cooling and light management via the ultra-broadband versatile textures is proposed, originating from the interaction with the visible, near-infrared, and mid-infrared electromagnetic waves (EMWs) via geometric, diffractive, and subwavelength optical effects. The sol–gel imprinted ultra-broadband textures exhibited a near-unity infrared emissivity over 0.96 at the atmospheric window between 8 to 13 μm for radiative cooling, and a solar transmittance and haze above 0.94 and 0.95 at the wavelengths from 350 to 750 nm, respectively, for light management. Applying the ultra-broadband textures imprinted glass to silicon PV modules as an encapsulant cover, the short-circuit current and conversion efficiency were increased by 5.12 and 3.13% in relative terms, respectively. The fabrication of such ultra-broadband versatile textures was photolithography-free, scalable, and PV industry compatible, which provided a cost-effective, long-term durable, and energy-efficient means to both light and thermal management through ultra-broadband matter-EMW interaction not only in PV modules, but also various opto-electro-thermal devices.
研究领域:
光学工程
·
材料科学
·
能源科学
·
光伏技术
·
热力学
·
纳米制造
·
电磁波与物质相互作用
✓ 已验证
DOI
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yibo Zhang,Shen Wang,Biao Liu,Yan Hao
MgAl 2 O 4 :Cr 3+ transparent ceramics were prepared by a hot-pressed sintering process with Y 2 O 3 and La 2 O 3 as sintering aids, and the effects on the microstructure, densification, optical transmission, and photoluminescent properties were investigated. The sintering aids of Y 2 O 3 and La 2 O 3 enhanced the relative density, reaching 99.33% with 2.4 wt% Y 2 O 3 and 99.24% with 0.8 wt% La 2 O 3 . La 2 O 3 also inhibited abnormal grain growth and obtained ceramics with uniform grain size. In addition, the optical transmission was also improved with Y 2 O 3 and La 2 O 3 as sintering aids. The transmission of the ceramic with 2.4 wt% Y 2 O 3 exceeded 78% in the region of 700–6000 nm and reached 83% at 1450 nm. Moreover, Y 2 O 3 and La 2 O 3 both contributed to improving the quantum yield of the ceramics, especially for Y 2 O 3 , and the quantum yield was about 0.354, which was approximately two times higher than that without R 2 O 3 . In summary, La 2 O 3 was helpful for improving sintering process, inhibiting grain growth, and homogenizing the grain size, while Y 2 O 3 was significant for enhancing the optical and photoluminescent properties.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
光电子学
·
固态发光材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Yanfeng Wang,Wei Chen,Xiao Chen,Huajun Feng,Dongsheng Shen,Bin Huang,Yufeng Jia,Yuyang Zhou,Yuxiang Liang
CdS/MoS 2 , an extremely efficient photocatalyst , has been extensively used in hydrogen photoproduction and pollutant degradation . CdS/MoS 2 can be synthesized by a facile one-step hydrothermal process. However, the effect of the sulfur source on the synthesis of CdS/MoS 2 via one-step hydrothermal methods has seldom been investigated. We report herein a series of one-step hydrothermal preparations of CdS/MoS 2 using three different sulfur sources: thioacetamide, l -cysteine, and thiourea . The results revealed that the sulfur source strongly affected the crystallization, morphology, elemental composition and ultraviolet (UV)–visible-light-absorption ability of the CdS/MoS 2 . Among the investigated sulfur sources, thioacetamide provided the highest visible-light absorption ability for CdS/MoS 2 , with the smallest average particle size and largest surface area, resulting in the highest efficiency in Methylene Blue (MB) degradation. The photocatalytic activity of CdS/MoS 2 synthesized from the three sulfur sources can be arranged in the following order: thioacetamide > l -cysteine > thiourea . The reaction rate constants ( k ) for thioacetamide, l -cysteine, and thiourea were estimated to be 0.0197, 0.0140, and 0.0084 min −1 , respectively. However, thioacetamide may be limited in practical application in terms of its price and toxicity, while l -cysteine is relatively economical, less toxic and exhibited good photocatalytic degradation performance toward MB.
研究领域:
材料科学
·
环境化学
·
纳米催化
·
光催化
·
无机功能材料
·
能源材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 14
·6377-6385
·
IF 3.5
Chengping Fang,Shuoheng Wang,Shuai Wei,Qingxian Xu,Zeyu Lyu,Sida Shen,Taixing Tan,Hongpeng You
NIR luminescent materials have garnered widespread attention because of their exceptional properties, with high tissue penetration, low absorption and high signal-to-noise ratio in the field of optical imaging. However, producing nanophosphors with high quantum yields of emitting infrared light with wavelengths above 1000 nm remains a significant challenge. Here, we prepared a nanoscale ZnGa2O4:xCr3+,yNi2+ phosphor with good luminescence performance in near-infrared emission, which was synthesized via a hydrothermal method and subsequent calcination process. By co-doping with Cr3+ and Ni2+, the ZnGa2O4 phosphor shows a strong broadband emission of 1100–1600 nm in the second near-infrared (NIR-II) region, owing to the energy transfer from Cr3+ to Ni2+ with an efficiency up to 90%. Meanwhile, a near-infrared phosphor-conversion LED (NIR pc-LED) device is fabricated based on the ZnGa2O4:0.8%Cr3+,0.4%Ni2+ nanophosphor, which has under 100 mA input current, an output power of 23.99 mW, and a photoelectric conversion efficiency of 7.53%, and can be effectively applied in imaging and non-destructive testing. Additionally, the intensity ratio of INi/ICr of ZnGa2O4:0.8% Cr3+,0.4%Ni2+ with its high sensitivity value of 4.21% K−1 at 453 K under 410 nm excitation, indicates its potential for thermometry application.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Wenya Zhao,Zhiwei Ma,Yue Shi,Ruijing Fu,Kai Wang,Yongming Sui,Guanjun Xiao,Bo Zou
Improvements in yellow light production, a healthy light source for the eyes that is also beneficial to biological growth, are needed to satisfy the practical requirements of solid-state lighting. Here, we report high-brightness yellow light emission in zero-dimensional lead-free double-perovskite Rb 2 TeCl 6 microcrystals (MCs) driven by high-pressure processing. We note that the photoluminescence quantum yields (PLQYs) experience a significant enhancement by an order of magnitude upon a mild pressure of 1.7 GPa. The overlap between ground state and self-trapped state is reduced by pressure-tailored electron-phonon coupling. Accordingly, the phonon-assisted non-radiative relaxation is inhibited, resulting in a considerable increase in PLQY. Furthermore, marked piezochromism from pale yellow to green is realized in compressed Rb 2 TeCl 6 MCs. Our study not only enables pressure as a robust tool to boost yellow light efficiency but also provides deep insights into the underlying photophysical mechanism, facilitating the rational synthesis of materials by design.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
DOI
高影响因子
Heliyon
·
2022
·
IF 3.776
Bin Huang,Wenbing Yu,Li Yang,Yan Li,Ning Gu
Compared with the large number of single-function materials such as aggregation-induced emission (AIE), mechanochromic luminescence (MCL), or thermally activated delayed fluorescence (TADF) emitters, multifunctional emitting materials offer more opportunities in practical applications. In this report, we provide a simple molecular design strategy towards the conversion of a MCL building block to a multifunctional emitter. Through altering the substituent sites and increasing the number of electron donors and steric hindrance on a normal MCL backbone benzo[ d , e ]benzo[4,5]imidazo[2,1- a ]isoquinolin-7-one, a novel multifunctional material 10,11-bis-(4-diphenylamino-phenyl)-benzo[ d , e ]benzo[4,5]imidazo[2,1- a ]isoquinolin-7-one (10,11-2TPA-BBI) is designed and synthesized. 10,11-2TPA-BBI exhibits simultaneous polymorphism, AIE, MCL and TADF properties. It can form four different aggregate species: yellow solid (YS) and orange solid (OS), orange flake-shaped crystal (OC), and red prism-like crystal (RC). Among them, because of the small energy gaps (Δ E ST s < 0.3 eV) between the singlet and triplet excited states, OS, OC and RC exhibit TADF properties, while YS show normal fluorescence characteristics with a large Δ E ST of 0.33 eV. OS can be reversibly transformed into YS upon external stimuli, which can be attributed to the emission switch between local excited state and charge transfer state. Crystallographic study indicates that the bulky structure and weak intermolecular interactions account for polymorphism and AIE properties. This work will provide a simple molecular design strategy for multifunctional materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 12
·3604-3612
·
IF 5.934
Lili Wang,Xiaoying Kong,Peng Li,Weiguang Ran,Xuefang Lan,Qian Chen,Jinsheng Shi
Phosphors with high color purity and brightness are strongly desired for applications in areas such as solid-state lighting and displays. Herein, a new narrow-band intense green-emitting phosphor, Eu2+ doped CsKNaLi(Li3SiO4)4 (CKNLLSO) with a full width at half maximum of 55 nm, is reported. The substitutions of Eu2+ on three monovalent cations Na+, K+, and Cs+ resulted in three Gaussian emission bands. The barycenter energy of Eu2+ 4f65d configuration was calculated using a semi-empirical formula and compared with the experimental value. The rigid tunnel structure and luminescence concentration quenching were also analyzed to judge site occupation. The crystal and band structures of the host compound were characterized and calculated with the aid of Rietveld refinement and density functional theory, respectively. The CKNLLSO:Eu2+ phosphor exhibits relatively high thermal stability even if the temperature is increased to 190 °C. The optical properties of green and white LEDs fabricated by mixing the optimized CKNLLSO:4%Eu2+ phosphor without or with commercial blue and red phosphors were investigated. The detailed discussion about the relationship between the rigid tunnel structure and PL properties of CKNLLSO:Eu2+ will serve as a guide to develop new oxide-based narrow-band phosphors. All the results imply the great potential of Eu2+ doped CKNLLSO phosphors for applications in the field of backlighting or pc-wLEDs.
研究领域:
材料科学
·
光电学
·
固态照明
·
发光材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）