CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hui Zhang,Yazhou Wang,Yan Jiao,Si Chen,Meisong Liao,Yongzheng Fang,Weiqing Gao,Lili Hu
Fluorescent powders exhibiting excitation dependence and luminescent discoloration are profoundly relevant for concealing information and enhancing optical antiforgery protection. In this study, Bi 3+ /Ln 3+ (Eu 3+ , Er 3+ )-doped phosphors exhibiting multicolor luminescence and excitation wavelength dependence were synthesized. The Bi 3+ /Eu 3+ -codoped phosphors emitted blue, pink, lavender, and red lights under excitation from conventional ultraviolet (UV) sources. In addition to emitting blue light, the Bi 3+ /Er 3+ -codoped phosphors also transmitted upconversion-emission light from green to yellow under 980-nm laser excitation. Additionally, the luminous color of the Ca 3 Y 2 Ge 3 O 12 :0.01Bi 3+ , 0.2Er 3+ phosphor changed from yellow to orange as the temperature increased. Combining the above luminous-color-change phenomena, the word-hiding experiment exhibited excellent realistic information hiding, with complex color transformation in the stamen and petal parts of the flower pattern. Furthermore, rapid multimodal and complex discoloration was achieved using easy-to-obtain light sources, confirming the potential of Bi 3+ /Ln 3+ phosphors for anticounterfeiting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 4
·期 15
·4120-4125
·
IF 5.231
Xiaoyong Zhang,Junfeng Hui,Bin Yang,Yong Yang,Daidi Fan,Meiying Liu,Lei Tao,Yen Wei
PEGylation is a popular approach for the surface functionalization of nanoparticles to achieve improved properties and better performance. Herein, we developed a facile method for surface PEGylation of hydrophobic fluoridated hydroxyapatite (FAp):Ln3+ (Ln = Eu or Tb) nanorods via hydrophobic interactions between oleic acid and amphiphilic synthetic copolymers, which were synthesized through reversible addition-fragmentation chain transfer (RAFT) polymerization using stearyl methacrylate (SMA) and poly(ethylene glycol) methacrylate (PEGMA) as monomers. Our results demonstrated that the morphology and fluorescent properties of the FAp nanorods are not significantly changed by the PEGylation procedure, and the resulting FAp nanorods were found to be stable in aqueous solution. More importantly, these PEGylated FAp nanorods are biocompatible with cells and could be utilized for cell imaging applications. Therefore, we believe that the method described in this work is a simple, efficient and general strategy for the surface PEGylation of hydrophobic nanoparticles.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 15
·期 5
·1001-1006
·
IF 3.842
Miao Wang,Guoqing Jiang,Yanfeng Tang,Yujun Shi
Without any templates or surfactants, large-scale 3D persimmon-shaped hierarchical LaF3 and LaF3:Ln3+ (Ln = Eu, Tb) have been synthesized via a simple hydrothermal route using organic tetrafluroborate complexes N(C4H9)4BF4 as the fluoride source. The phase and morphology of the products have been characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The SEM and TEM results indicate the 3D persimmon-shaped hierarchical microstructures are constructed by numerous nanodisks with mean thickness of 50 nm. It is found that several factors, including the fluoride sources, molar ratio of reagents and the reaction time, play crucial roles in the formation of the multilayer stacked structures. Detailed studies indicate that the layer-by-layer self-assembly of nanodisks is responsible for the formation of 3D hierarchical structures. The possible mechanism of the crystal growth and assembled procedure are also proposed. Furthermore, the photoluminescent properties of LaF3:Ln3+ (Ln = Eu, Tb) are studied, which exhibit orange-red (Eu3+:5D0–7F1,2,3,4) and green (Tb3+, 5D4–7F3,4,5,6) emission, respectively.
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 ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 6
·2974-2980
·
IF 1.491
Zheng Yuhui,Hu Jing,Deng Surong,Gao Jinwei,Wang Qianming
High-purity LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm, Dy) phosphors with tetragonal zircon structures were successfully synthesized. The reactions have been carried out by multiple irradiations with very high efficiency. Transmission electron microscope images showed that the phosphors had rod-like structures with average lengths of about 200 nm. The host absorption edge of LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm) shifted to the longer wavelength side. Furthermore, the red emission of Eu 3+ ion and the orange emission of Sm 3+ ion are remarkably enhanced by encapsulating Bi 3+ in LuVO 4 system, whereas in the case of LuVO 4 : Dy 3+ /Bi 3+ , the host absorption and the yellow emission from dysprosium have been suppressed in the presence of Bi 3+ . These novel findings will facilitate their use in the display field.
研究领域:
材料科学
·
光学材料
·
发光材料
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 29
·4862-4874
·
IF 3.117
Jie Xiong,Wei Wang,Yini Mao,Qingyuan Liu,Jun Yang,Jianfeng Tang,Shanshan Hu
BaLu2−xF8:xLn3+ crystals have been synthesized via a one-step hydrothermal route without any surfactants. X-ray diffraction (XRD), scanning electron microscopy (SEM), and down-shift/up-conversion photoluminescence spectroscopy were used to characterize the samples. Pure monoclinic BaLu2F8 crystals were obtained at pH = 7 with NaBF4 as a fluoride source. Doping 0.06 mmol Ln3+ ions from Ho3+ to La3+ and doping Yb3+ ions from 0.1 to 0.4 mmol both have caused dramatic changes to the product's morphology from prismatic microrods of about 10 μm to particles of about 3 μm aggregated by flakes. The differences in the phase, size and shape of the final products were greatly related to the fluoride source and pH values, which have been studied in detail. In addition, surfactants also affected the phase and morphology of the BaLu2F8 crystals. Multicolor down-shift emission was achieved in the BaLu1.94F8:0.06Ln3+ (Ln = Sm, Eu, Tb, Dy, Er and Tm) crystals under UV lamp excitation at 365 nm, and multicolor UC luminescence has been achieved in BaLu2F8:Yb3+,Ln3+ (Ln = Er, Tm, Ho) systems. When the Yb3+–Er3+ ions are co-doped into the host, the mechanism for the red emission (4F9/2 → 4I15/2) retains the tri-photon process like the single-doped Er3+ ion, but the mechanism for the green emission (2H11/2/4S3/2 → 4I15/2) is a two-photon process. Furthermore, the UC luminescence mechanism for the co-doped Yb3+–Ho3+ pairs is also a tri-photon process in the BaLu2F8 matrix. The as-prepared BaLu2F8:Ln3+ phosphors have potential applications in the fields of light emitting devices, three-dimensional displays and backlights.
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 Chemistry C
·
2024
·Vol. 12
·期 38
·15761-15767
·
IF 5.7
Zihan Chen,Xiuxiu Peng,Wenjun Zhang,Wei Gao,Chengyue Xin,Zhongfa Li,Xiaoyan Yu
Single-host white light-emitting diodes with good stability and simple fabrication methods have attracted extensive attention from researchers. In this study, Cs2NaGdCl6:Sb3+ with blue emission is synthesized by introducing Sb3+ into Cs2NaGdCl6. After doping Tb3+ into Cs2NaGdCl6:Sb3+, the sample achieves a tunable ion emission from blue to green. The energy transfer relationship between Sb3+ and Tb3+ is explored. White phosphors with CIE coordinates of (0.34, 0.33) are obtained by introducing Ho3+ into Cs2NaGdCl6:Sb3+/Tb3+ double perovskites. This work provides a new option for white light emission of halide perovskites doped with Ln3+.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 13
·5688-5695
·
IF 3.269
Xiaoming Xie,Jie Chen,Ye Sheng,Yanhua Song,Xiuqing Zhou,Xiangting Zhang,Zhan Shi,Haifeng Zou,Keyan Zheng
A series of novel color tunable dandelion-like SiO2:Ln3+ (Ln = Eu, Tb) nanophosphors of approximately 70 nm diameter were prepared using a simple hydrothermal route. The phase, time-dependent shape evolution, morphology, sizes, and luminescence properties of the as-prepared products were well characterized by means of X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectrometry, and photoluminescence spectra as well as kinetic decay curves. Under ultraviolet excitation, the Eu3+ and Tb3+ singly doped SiO2 samples showed strong red and green emission, respectively. Furthermore, the luminescence colors of the as-prepared Tb3+, Eu3+ co-doped dandelion-like SiO2 nanophosphors could be altered from green to red, including green-yellow, yellow, orange yellow and reddish orange, by simply adjusting the doping concentrations of Eu3+.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Shuai Li,Chunrong Zhu,Jinjiang Wang,Zheling Zhang,Dongjie Wang,Yiwen Chen,Doudou Zhang,Jing Wang,Jian Zhang
The broad-band self-trapped exciton (STE) emission feature of lead-free halide double perovskites makes it challenging to realize emission with various wavelengths in a single material. Cs2NaInCl6:Sb3+ crystals with blue emission (440 nm) were synthesized by rationally introducing the Sb3+ ion into Cs2NaInCl6 with a photoluminescence quantum yield (PLQY) up to 99.35%. The Ln3+ (Tb3+ and Ho3+) ions were doped into Cs2NaInCl6:Sb3+ to achieve spectrally tunable emission from blue to green and pink emission owing to the energy transfer from the host STE to Ln3+ ions, with PLQY values of 90.68% and 61.87%, respectively. By carefully adjusting the doping level of Ln3+ ions, white light emission with a PLQY of 68.87% was achieved in the Tb3+ and Ho3+ co-doped Cs2NaInCl6:Sb3+ system. LED devices based on Sb3+/Ln3+ co-doped Cs2NaInCl6 with multicolor and white light emissions were fabricated based on these phosphors, which exhibit excellent spectral and environmental stability. The results show that double perovskite luminescence materials have potential for application in solid-state lighting and multi-color displays.
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 ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jin Liu,Yaowei Guo,Yupeng Bi,Yao Wang,Yanxin Wang,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Reversible bright-dark luminescence nanomaterials have been developed for information storage and anti-counterfeiting in recent years, however, their monochrome characteristic and 2D patterning impose limits on the effective information storage density. In this work, a new strategy for producing ultraviolet switchable and stable luminescent patterns is proposed, based on Ln 3+ (Eu 3+ /Tb 3+ ) induced-polyelectrolyte aggregates (LIPAs) with sharp multi-color optical properties . Under 365 nm excitation, a multicolor pattern can be observed using both red and green, which is not visible when this excitation light source is off. The LIPAs enable the luminescent lanthanide complexes to be compatibilized with poly(lactic acid) (PLA). Functional anti-counterfeiting patterns were prepared by 3D printing using luminescent PLA containing by Ln 3+ (Eu 3+ /Tb 3+ ) LIPAs. Invisible, adjustable and ultra-stable multicolor luminescent patterns well enable information storage and enhance information security for anti-counterfeiting applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 41
·6911-6919
·
IF 3.117
Dingyi Shen,Yini Mao,Jun Yang,Lu Cao,Juntao Ning,Shanshan Hu
In this work, uniform and monodisperse Sr2YF7 spheres were successfully synthesized via a facile one-step hydrothermal route without employing any surfactant. Particularly, a well-defined morphology of Sr2YF7 crystals ranging from spherical to octahedral shape was first achieved by adjusting the pH values. In addition, the spherical products doped with 6% Ln3+ (Ln = La, Ce, Pr, Sm, Gd, and Dy) show different sizes ranging from 300 to 600 nm. The Sr2YF7 crystals also exhibit excellent multicolor DS/UC luminescence properties after doping with different Ln3+ ions. Energy transfer from Tb3+ to Eu3+ was observed in Sr2YF7 crystals; the Sr2YF7:Dy3+ crystals showed nearly white light emission under UV excitation; Sr2YF7:Yb3+/Er3+/Tm3+ crystals could produce pure white light with a CIE color coordinate of (0.3123, 0.3005) by controlling the doping concentrations of Er3+ and Tm3+ ions under 980 nm excitation. The as-prepared phosphors may potentially serve as light, color displays and markers in biological imaging.
研究领域:
材料科学
·
光学
·
生物成像
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Guo Gong,Ya Song,Haihu Tan,Shaowen Xie,Changfan Zhang,Lijian Xu,Jianxiong Xu,Jie Zheng
Lanthanide-doped NaYF 4 upconversion luminescent nanophosphors have attracted great interest for anti-counterfeiting applications. However, low luminescent intensity caused by surface defects and low extinction coefficients of lanthanide dopants greatly limits their practical applications. Herein, we developed core/active-shell NaYF 4 :Ln 3+ @NaYF 4 :Yb 3+ (e.g. NaYF 4 :Er 3+ /Tm 3+ @NaYF 4 :Yb 3+ , NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 :Yb 3+ , and NaYF 4 : Yb 3+ /Tm 3+ @NaYF 4 :Yb 3+ ) nanophosphors with enhanced near-infrared (NIR)-to-visible upconversion luminescence by coating Yb 3+ -doped NaYF 4 shell (active-shell) on NaYF 4 :Ln 3+ upconversion core nanoparticles . The structure, morphology, and elemental composition of NaYF 4 :Ln 3+ @NaYF 4 :Yb 3+ core/active-shell nanoparticles (CASNs), NaYF 4 :Ln 3+ @NaYF 4 core/inert-shell nanoparticles, and NaYF 4 :Ln 3+ core nanoparticles were characterized and compared systematically to reveal their structure-property relationship. Collective data showed that coating of a NaYF 4 :Yb 3+ active shell on NaYF 4 :Ln 3+ cores significantly enhanced upconversion luminescent intensity by ~21 times, while an inert (pure NaYF 4 ) shell coated on the surface of NaYF 4 :Ln 3+ core only resulted in 5.2 times luminescence enhancement. The enhanced upconversion luminescence intensity was mainly attributed to (i) the NaYF 4 shell-reduced quenching effect and (ii) the promoted transformation of the absorbed NIR light from the pump source to the core nanoparticles by Yb 3+ sensitizer in the active shell. Moreover, by tailoring dopant pairs and molar ratios of lanthanide ions in the core nanoparticles, three CASNs with enhanced red, green, and blue upconversion luminescence were obtained and fabricated into environmental benign luminescent inks. The inkjet printing of RGB CASNs inks on papers produced multiple-color, high-resolution, complex luminescent patterns under 980 nm laser. This work expands the lanthanide-doped NaYF 4 materials for anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tianshuai Lyu,Pieter Dorenbos,Zhanhua Wei
Developing X-ray charged dosimeters with excellent charge carrier storage capacity and stability is challenging. Such energy storage dosimeters have fascinating use in developing novel applications, for instance, in radiation detection, advanced multimode anti-counterfeiting, and flexible X-ray imaging of curved objects. Herein, novel LiTaO 3 :Ln 3+ ,Eu 3+ (Ln = Tb or Pr) perovskite dosimeters are reported by combining the vacuum referred binding energy (VRBE) diagram of LiTaO 3 and the optimization of dopant’s concentration and compound synthesis condition. Based on the VRBE diagram prediction, charge carrier capturing and de-trapping processes in Eu 3+ and/or Ln 3+ (Ln = Tb or Pr) doped LiTaO 3 will be studied to unravel the role of Eu 3+ as a good electron trapping centre and to discover a record storage phosphor. The ratios of the thermoluminescence intensity of the optimized LiTaO 3 :0.005Tb 3+ ,0.001Eu 3+ to that of the state-of-the-art BaFBr(I):Eu 2+ , Al 2 O 3 :C, or NaLuF 4 :Tb 3+ are 5.2, 8.8, or 2.8, respectively. The charge carriers can be stored more than 1000 h in LiTaO 3 :0.005Tb 3+ ,0.001Eu 3+ . Proof-of-concept anti-counterfeiting application will be demonstrated by combining the colour-tailorable photoluminescence, afterglow, thermally, or optically stimulated luminescence in LiTaO 3 :0.005Tb 3+ ,xEu 3+ and LiTaO 3 :0.005Pr 3+ ,0.001Eu 3+ . Multimode anti-counterfeiting application will be proposed by combining a high absolute X-ray scintillation light yield of 19000 ± 1800 ph/MeV of LiTaO 3 :0.005Tb 3+ ,0.001Eu 3+ . Proof-of-concept flexible X-ray imaging application will be demonstrated by using the optimized LiTaO 3 :0.005Tb 3+ , 0.001Eu 3+ dispersed in a silicone gel film.
研究领域:
材料科学
·
辐射探测技术
·
光学材料
✓ 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）