OPTICAL MATERIALS
·
2023
·
IF 3.9
Ke Sun,Haibin Lin,Rui Zhang,Jinlong Zhu,Liping Wang,Songbai Han,Xiaofei Wang
The emerging laser-driven phosphor-converted white laser diodes (w-LDs) demand highly efficient and thermally stable color converters. To this end, the Ce 3+ luminescence in the rekindled La–Si–O–N host, and the impacts of NH 4 Cl flux and post-processing are investigated systematically. On the basis of the XRD results, well crystalline Ce 3+ -doped La 5 Si 3 O 12 N and LaSiO 2 N are obtained at 1600 °C for 5 h and 1500 °C for 4 h, respectively. Impressively, the representative La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ exhibit a broad excitation band from 240 nm to 400 nm, peaking at around 360 nm, which is well matched with emission from near-UV (n-UV) chip. Under excitation by a n-UV laser, the La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ produce bright blue light in a wide emission band from 360 nm to 550 nm. The CIE chromaticity diagram reveals the tunability of the hue of these phosphors. The quenching temperature is determined to be 396 K and 429 K for La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ respectively, indicating superior thermal stability. The addition of 3 wt% NH 4 Cl flux much enhances the emission intensity of both La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ . Furthermore, the post-treatments markedly improve the luminescence properties by increasing the crystallinity , reducing the surface defect , and changing the morphology. Therefore, it is believed that the present work has promising applications in LD lighting and promoting the development of laser display.
研究领域:
材料科学
·
光学
·
光子学
·
激光技术
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Pinyi He,Su Yang,Xinghua Liu,Yongzhen Yang,Jingxia Zheng,Xuguang Liu,Bingshe Xu
Green-emitting graphene quantum dots (GQDs) with a high crystallization degree were prepared by a two-step solvothermal method . Owing to the co-doping of nitrogen and oxygen, carbonyl and amide groups were introduced into GQDs. The quantum yield (QY) of GQD solution is up to 47.09%, which is higher than that of other GQDs synthesized by top-down methods. Since GQD solution exhibits concentration-dependent photoluminescence (PL) properties, green, yellow, and orange emissions were realized by adjusting GQD concentration. A high concentration (no less than 6.0 mg mL −1 ) GQD solution was mixed with KH-792 to form a yellow-emitting fluorescent film with an excellent fluorescence and thermal stability, which was used as color converters and combined with 405 nm laser diodes (LDs) to realize the devices with white laser-emitting. The Commission Internationale de L'Eclairage (CIE) coordinate of the laser device is (0.34, 0.39), the correlated color temperature (CCT) is 5288 K, and the color rendering index (CRI) is 70. This work provides an advanced way for the development of laser fluorescent materials.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinqing Chen,Wenqi Xie,Xiangguang Guo,Bin Huang,Yu Xiao,Xiaoqi Sun
In this paper, a series of high performance near-infrared reflective pigments based on Bi 3 YO 6 doped with Fe 2 O 3 and Tb 4 O 7 were prepared by high-temperature calcination method. The pigments were characterized by some analytic techniques, such as XRD , Particle size analyzer, SEM, EDS , UV–vis–NIR spectrophotometer, CIE L*a*b* (1976) color space and infrared thermal imaging. Experimental results showed that the Fe 2 O 3 doping in Bi 3 YO 6 could change the color from bright yellow to ochre red. The substitution of Tb (IV)-doped pigments changed the color to dark orange. The doping of Fe (III) and Tb (IV) contributed to enriching the color diversities of pigments. Among the synthesized pigments, Bi 3-x Fe x YO 6 and Bi 3 Y 1-x Tb x O 6+δ displayed a disordered defective fluorite-type structure. The effect of doping Fe (III) and Tb (IV) reduced the near-infrared reflectance of the pigment. Excepting for Bi 3-x Fe x YO 6 (x = 0.8), the near infrared reflectance of some other pigments were higher than the China National standard (CNs). Chemical resistance tests showed that the pigments had excellent acid and alkali resistance. Finally, the application practical of traditional iron oxide yellow pigment and three prepared pigments, i.e., Bi 3 YO 6 , Bi 3-x Fe x YO 6 (x = 0.4) and Bi 3 Y 1-x Tb x O 6+δ (x = 0.05) were studied and compared by infrared thermal imaging. The test results showed that Bi 3 YO 6 still had a strong near-infrared reflection effect after being painted. Compared with traditional iron yellow pigment, Bi 3 YO 6 could reduce the surface temperature of galvanized sheet by 20 °C under the illumination of infrared light. The series of Fe (III) and Tb (IV) doped pigments prepared in this paper have revealed some promising application values.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Yue Lu,Yong Yang,Li Guan,Dawei Wang,Jinxin Zhao,Jingfa Yang,Zhiren Wei,Fenghe Wang,Zhiping Yang,Xu Li
ZnS coating with oleic acid nano-particles have been successfully synthesized through the oil-phase thermal injection method. As-prepared samples are characterized by powder X-ray diffraction, transmission electron microscopy and spectra analysis. The emission color of ZnS NPs changes from blue to cyan with different ratio of Zn/S. ZnS: x Eu 3+ NPs with different doping concentrations of Eu 3+ ions have different emission intensities and CIE coordination. The emission peaks vary with the change of y value of ZnSe y S 1- y NPs, and the chromaticity coordinate transit from green to yellow region. The emission color and mechanism of the luminescent properties of ZnS, ZnS: x Eu 3+ and ZnSe y S 1- y NPs are studied in detail. The results indicate that the thermal mixture injection without toxic is an effective and green method for synthesizing metal sulphitde, and the energy level structure, particle size, photoluminescence of ZnS can be achieved by forming different defect or doping of Eu or Se ions .
研究领域:
纳米技术
·
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2023
·Vol. 78
·期 11
·1061-1067
·
IF 1.8
Arif Ullah,Jinghao Zhuang,Zheng Liu,Xiaozhan Yang,Wenlin Feng
In this work, the phosphors of Eu 3+ ions doped Ba 2.9 Sr 0.1 WO 6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscope). The emission spectra consist of the characteristic peak of Eu 3+ excitation at 393 nm; the leading emission peak at 618 nm can be ascribed to the transition of 7 F 0 → 5 L 6 . The optimal red emission is achieved by 2 % Eu 3+ doping. This red Ba 2.9 Sr 0.1 WO 6 : Eu 3+ has good luminescent properties and may have potential application in white LEDs.
研究领域:
材料科学
·
光电材料
·
荧光粉材料
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiaolin Zhu,Zhangcheng Pan,Tianyue Xu,Xiuwen Shao,Zhaoju Gao,Qingyu Xie,Yupeng Ying,Wei Pei,Hao Lin,Jia Wang,Xiaosheng Tang,Weiwei Chen,Yongfeng Liu
All-inorganic perovskite quantum dots (PeQDs) have sparked extensive research focus on white-light-emitting diodes (WLEDs), but stability and photoluminescence efficiency issues are still remain obstacles impeding their practical application. Here, we reported a facile one-step method to synthesize CsPbBr3 PeQDs at room temperature using branched didodecyldimethylammonium fluoride (DDAF) and short-chain-length octanoic acid as capping ligands. The obtained CsPbBr3 PeQDs have a near-unity photoluminescence quantum yield of 97% due to the effective passivation of DDAF. More importantly, they exhibit much improved stability against air, heat, and polar solvents, maintaining >70% of initial PL intensity. Making use of these excellent optoelectronic properties, WLEDs based on CsPbBr3 PeQDs, CsPbBr1.2I1.8 PeQDs, and blue LEDs were fabricated, which show a color gamut of 122.7% of the National Television System Committee standard, a luminous efficacy of 17.1 lm/W, with a color temperature of 5890 K, and CIE coordinates of (0.32, 0.35). These results indicate that the CsPbBr3 PeQDs have great practical potential in wide-color-gamut displays.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Yanyan Li,Juan Zhang,Caiyuan Guo,Tingting Zhang,Yuehua Liang,Jiuzhi Wei,Yun Yan,Xinxian Ma
A carbazole-based Schiff-base small molecule ( FG ) was developed, with its molecular structure characterized by 1 H NMR, 13 C NMR, HRMS-ESI, IR spectroscopy and DFT calculations to confirm the presence of key functional groups and spatial configuration. This compound exhibited remarkable fluorescence enhancement upon coordination with Zn 2+ , and the FG–Zn²⁺ complex efficiently transferred energy to four fluorophores—Rhodamine 6 G ( RH6G ), Eosin Y, Acridine Red, and Nile red. Notably, white-light emission was achieved at a 60:1 molar ratio of FG–Zn²⁺ to RH6G , with CIE coordinates (0.30, 0.34), close to the standard white-light point (0.33, 0.33). Additionally, FG can be mixed with polyvinyl alcohol ( PVA ) to form a writable gel that reveals hidden patterns under UV light, showing promise for information encryption and secure data storage.
研究领域:
材料化学
·
光学材料
·
传感器与生物传感器
·
超分子化学
·
荧光光谱学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Liuyue Xiao,Tianhao Li,Hui Ling,Yanjing Yang,Shian Zhong
The hybrid ratiometric fluorescence sensors (GKHMIPs & RKHMIPs) encompass luminescent substances incorporated within a core-shell architecture. These sensors manifest a diverse array of hues in response to variations in the concentration of alpha-fetoprotein, accomplished through disparities in the quantum dots (QDs)-protein response. This study is devoted to comprehending the principles governing the alteration of fluorescence during the recognition process of the ratiometric fluorescence sensor. A compensation mechanism, rooted in the correlation between fluorescence and protein response, is postulated through a fluorescence interaction model (multi-FRET model). Multi-FRET model can be divided into FRET process and Fluorescence compensate process (FCP), FCP occurs when electron orbits are filled, hindering the fluorescence resonance energy transfer process and leading to the return of excited state electrons to the ground state by alternative pathways. Based on the multi-FRET model we demonstrate the Sherpa formular to calculating the fluorescence-target relation. To assess the visual impact, the CIE-Lab model is introduced to validate the rationale behind the multi-color colorimetric model. The influence of different mixing ratios on the visualization effect is elucidated using the concentration fluorescence response model, and the optimal relationship between wavelength combinations in the tricolor mixing model is proposed.
研究领域:
生物传感器
·
分析化学
·
分子生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Ruonan Yao,Jiawei Lin,Kunjie Liu,Yuanchang Xu,Boyi Xiao,Jing Zhao,Zhongnan Guo,Quanlin Liu,Wenxia Yuan
Low-dimensional tin-based halide perovskites are considered as eco-friendly substitutions of the iconic lead-based perovskites to host the potential as optoelectronic materials. However, a fundamental understanding of the structure–property relationship of these Sn(II)-based hybrids is still inadequate due to the limited members of this material family. To our knowledge, there is still lack of reports on a series of Sn(II)-based halide perovskites with the same organic cation but covering chloride, bromide, and iodide. In this work, three new halide perovskites TMPDASnX4 (X = Cl, Br, I) (TMPDA = N,N,N′,N′-tetramethyl-1,4-phenylenediamine) are successfully synthesized, which provide the ideal paradigm to study the halogen-dependent evolution of the structure and properties of Sn(II)-based hybrid perovskites. Despite sharing the same monoclinic lattice (P21/m space group), it is demonstrated that TMPDASnCl4 adopts a one-dimensional structure composed of a five-coordinated pyramid configuration due to an extremely long Sn···Cl distance, while the typical two-dimensional motif is still maintained in TMPDASnBr4 and TMPDASnI4. The ambient stability is declined in the order from chloride to bromide and then to iodide. TMPDASnCl4 exhibits a broad-band bluish-white-light emission (centered at 515 nm, full width at half-maximum (fwhm) = 193 nm) with the Commission Internationale de l′ Elairage (CIE) coordinates as (0.29, 0.34). Further, the correlated color temperature and color-rendering index were determined as 7617 K and 80.5, respectively. Based on the synthesis of new crystals, our work sheds light on the composition–structure–property relationship of hybrid Sn(II)-based halide perovskites.
研究领域:
材料科学
·
光电
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yandong Ren,Shuchen Lü
Copper(I) halides have recently attracted increasing attention in a variety of photonics applications, owing to their highly luminescent efficiency, nontoxicity, and low-dimensional electronic structure. Moreover, combining compositional engineering and mass production of new materials may further enrich the research and application of functional materials. Herein, we controllably synthesized two series of novel mixed-halide Cs 3 Cu 2 Cl 5-x I x and Cs 5 Cu 3 Cl 8-x I x powders via the compositional engineering for the first time. The crystal structures are identified with Rietveld refinement and density functional theory calculations. The mixed-halide compound exhibits relatively wide full width of half-maximum (~70 nm), adjustable bandgap (from 449 nm to 486 nm), larger Stokes shifts (~200 nm), and dramatic improved stability with high efficiency (photoluminescence quantum yield at least 90.61%), which present a scalable strategy for mass production for practical applications. In addition, the controllable phase transformation from blue-emitting Cs 3 Cu 2 I 5 to yellow-emitting CsCu 2 I 3 was confirmed. Most notably, the white light is obtained by combining novel Cs 3 Cu 2 Cl 5-x I x /Cs 5 Cu 3 Cl 8-x I x with yellow-emitting CsCu 2 I 3 powders. Based on this, we firstly introduce the blue-emitting Cs 5 Cu 3 Cl 7 I powders in white LED fabrication by combining ultraviolet chip and as-prepared yellow-emitting CsCu 2 I 3 powders, to generate high-quality and stability white light with CIE coordinates of (0.335, 0.398) and colour rendering index value of 77.8. For comparison, red-emitting CaAlSiN 3 :Eu 2+ phosphors are also introduced for LED package to substitute CsCu 2 I 3 powders, which exhibit the high colour rendering index of 89.2. This work not only develops new mixed-halide compounds with high stability and performance, but also provides the unique strategy for promoting industrialization process of LED backlights.
研究领域:
材料科学
·
光子学
·
光电
·
化学
·
工程
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2023
·Vol. 11
·期 10
·2951
·
IF 3.5
Kairu Ye,Yan Yang,Haishuo Chen,Jiatong Wu,Hongyuan Wei,Leping Dang
To achieve the target colors, pigmentation (post-processing) in solvents is a key process in making Pigment Yellow 180 (PY180), a bis azo pigment. In this work, the solvent effect on the pigmentation behavior of PY180 was studied based on the Hansen solubility parameters (HSPs) and the molecular polarity index (MPI) method. First, the samples were characterized using FTIR, XRD, and TEM, and the colorimetric analysis was performed using the CIE L*a*b* color space model. It was found that the color hues obtained in ten solvents are different, with the overall color variation from reddish–yellow to greenish–yellow. Further characterization confirmed that the crystallinity and particle size increase of PY180 during the pigmentation mainly account for the variation of the chromaticity. Then, HSPs were introduced to understand how suspension behavior affects the dissolution–reprecipitation process. It shows that high-quality pigments can be obtained from solvents generally with low HSP differences (Δδ) between the solvents and PY180. To compensate for the inaccurate prediction of the HSPs method, MPI was used to value the influence of solvent molecular polarity. The results show that among solvents with similar solubility parameters to PY180, the stronger the molecular polarity index (MPI) of the solvent, the greater the color variation of the pigments. Meanwhile, different solvents influence the crystallization behavior of the low soluble system, which was supplemented by the above study.Keywords:pigment;solvent effect;crystallization
研究领域:
化学
·
材料科学
·
色彩科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiao-Fei Wang,Gui-Gen Wang,Jia-Bing Li,Zheng Liu,You-Xiao Chen,Long-Fei Liu,Jie-Cai Han
Herein we first report new chlorine-doped graphene quantum dots (Cl-GQDs) that can be used in solid-state white-light-emitting diodes (WLEDs). The Cl-GQDs with a mean size of 1.53 nm are obtained by one-step hydrothermal method using β-cyclodextrin and hydrochloric acid as the source materials. The PL emission spectra of the Cl-GQDs show an excitation-wavelength-dependent behavior in the range from 300 to 380 nm excitation. Under UV irradiation, the Cl-GQDs can direct emit white light. Given that they are worth using in light-conversion, Cl-GQDs embedded solid composite film (Cl-ESCF), based on silicon resin as host material, is successfully fabricated by solution-processing approach. The freestanding Cl-ESCF has high transparency and flexibility, excellent photostability and temperature resistance, and retains its optical properties in the solid state. In order to realize its potential, the Cl-ESCF converted remote UV-pumped WLED is demonstrated. The results verify that the Cl-GQDs can be homogeneously dispersed within solid matrix without obvious aggregation so that a uniform and defect-free natural white light can be obtained. In addition, our WLED possesses favorable white-light characters with the CIE of (0.33, 0.34), moderate CCT of 5653 K, and high CRI of 87.6, as well as good color and LED stability. This single-phase rare-earth-free white-luminescent Cl-GQDs may be not only expected to prevent the drawbacks of multicolor phosphors, thereby generating high-quality white emission, but also identified to be a green alternative for conventional emitters.
研究领域:
材料科学
·
纳米技术
·
光电
·
光子学
✓ 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）