CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaolei Zhu,Xiaoping Wang,Xianke Sun
Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors were prepared to investigate their luminescence characteristics. The SrZnSO:Bi 3+ , SrZnSO:Mn 2+ and SrZnSO:Tb 3+ phosphors, excited by the NUV/blue light, show blue, orange and green emissions, respectively. The Bi 3+ → Tb 3+ , Tb 3+ → Mn 2+ and Bi 3+ → Mn 2+ energy transfer processes take place in Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ -, Bi 3+ /Mn 2+ - and Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, which result in tunable luminescence of these phosphors. The CIE coordinates were calculated on the basis of the emission spectra, and they reflect the emission color changes of phosphors. For the Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ - and Bi 3+ /Mn 2+ - activated SrZnSO phosphors, the emission points are located in the cyan, yellow and white light regions, respectively. For the Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, the light is in warm white light region.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Zhao Dianlong,Li Shunxin,Su Yang,Qin Jiajun,Xiao Guanjun,Shang Yuchen,Yin Xiu,Lv Pengfei,Wang Feng,Yang Jiayi,Liu Zhaodong,Lan Fujun,Zeng Qiaoshi,Zhang Lijun,Gao Feng,Zou Bo
Current optical anti-counterfeiting technologies are mainly limited to materials with multicolor emissions, where the encryption method is only through photoexcitation. It brings about a huge risk for counterfeiting once these materials are reproduced. Here, we introduce a robust pressure encryption as the pressure engineering secret key to strengthen current optical anti-counterfeiting technique from pressure-induced emission luminogens. Through loading different pressures, the initially non-emissive 0D hybrid halide (C 7 H 11 N 2 , 4DMAP) 2 ZnBr 4 shows at least 8 different distinct bright emission colors. These color changes are attributed to controllable tuning of charge transfer and local excitation implemented by pressure treatment. Moreover, the unique color tuning through pressure loading, randomized distribution of the fluorescent particles, as well as designated micro-nano patterns greatly enhance the security capability of current visual information encryption, which serves as the triple-level physically uncopiable optical anti-counterfeiting technique. Our work provides a promising strategy of materials-by-design for high-performance anti-counterfeiting, imaging and information storage applications.
研究领域:
材料科学
·
光学工程
·
信息安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2023
·Vol. 55
·期 11
·1-15
·
IF 3
Li Xin,He Yu,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing
The Er 3+ , Yb 3+ and Mn 2+ co-doped perovskite NaMgF 3 submicron particles have been successfully fabricated and the related upconversion (UC) emission was investigated in this paper. The UC emission spectra confirm that the emission color of the Er 3+ ions can be modulated by the doping of the Mn 2+ ions, the incident laser power and the laser pulse-width. The UC emission results demonstrate that the key factor to modulate the UC emission color of the Er 3+ ions is the Mn 2+ ions in the submicron particles, in which the NaMgF 3 submicron particles have the largest relative green emission bands with the 3% Mn 2+ concentration. The experimental results also confirm that the UC intensities ratio of the green to the red emission will increase with the increase of the incident laser power and the decrease of the laser pulse-width. All the UC emission results imply that there are two energy transfer paths from the Mn 2+ state 4 T 1 to the Er 3+ ions, in which the transfer rate to the state 4 S 3/2 is far larger than the transfer rate to the state 2 H 11/2 and the energy transfer mechanism may related with the special structure of the Mn 2+ ions and the phonon-assisted processes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 47
·18845-18854
·
IF 7.367
Lin Ai,Zhaoyu Liu,Ding Zhou,Jiale Liu,Haoyang Zou,Zhennan Wu,Yi Liu,Hao Zhang,Bai Yang
Metal nanoclusters (NCs) have attracted broad attention for their molecular-like electronic structures and unique emission properties, but the difficulty in controlling emission color greatly limits their application in illumination and display. In this work, we demonstrate the capability to control the self-assembly induced emission (SAIE) of Cu NCs by modulating the inter-NC distance in the self-assembly materials, which is capable of tuning the emission color from green to red. The inter-NC distance is mainly modulated by controlling the experimental variables during the NC self-assembly, such as the species of the solvents and ligands, duration of assembly, temperature, and so forth. These experimental variables influence the balance of inter-NC weak interactions, thus altering the distance of as-assembled NCs. The variation of the inter-NC distance greatly influences the photo-physical behavior of Cu NCs, and in particular the ligand-to-Cu–Cu charge transfer, permitting the tuning of the emission color. As the Cu NCs self-assembly materials exhibit strong, stable, and color-tunable SAIE, they are employed as the color conversion materials for fabricating white light-emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Ruiqing Feng,Lifang Guo,Jinglong Fang,Yue Jia,Xueying Wang,Qin Wei,Xiaoqiang Yu
Mitochondria membrane potential (MMP) play significant roles during metabolism, signaling, and other important bioevents. Visualization of MMP levels is essential for many biological researches. However, fluorescent probes for monitoring MMP levels in dual emission colors are still deficient, which greatly limited the development of relative research areas. In this work, a pair of fluorescent probes have been designed and synthesized to monitor the MMP levels in dual emission colors based on Forster resonance energy transfer (FRET) mechanism. The FRET donor (FixD) is constructed by linking a benzyl chloride group to a fluorophore with bright-green emission. The FixD could target mitochondria and be immobilized in mitochondria by linking to the thiol group of mitochondrial proteins. The FRET acceptor (LA) is designed with green absorption and deep-red emission. In live cells with high MMP levels, FixD and LA both target mitochondria, and deep-red (DR) emission could be detected with the excitation of 405 nm. Particularly, the spectral shift of fluorescence upon the decrease of MMP is up to 110 nm, which is greatly favorable for the clear observation of MMP levels. With the decrease of MMP, LA would be released from mitochondria while FixD would still be immobilized in mitochondria, and decreased DR emission and increased green fluorescence could be detected due to the absence of FRET. In this manner, the MMP levels could be monitored in dual emission colors.
研究领域:
生物化学
·
分子生物学
·
细胞生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Dandan Ju,Feng Song,Jun Zhang,Chengguo Ming,Feifei Song,Adnan Khan,Aihua Zhou,Xueqin Wang,Lisa Liu
Dynamic tuning upconversion color is the most convenient approach through modulation of pump power density and NIR wavelength for anti-counterfeiting. However, most of bulk upconversion systems suffer from the insensitive response to excitation power and NIR wavelength (980 nm and 1550 nm). Herein, we demonstrate that the excitation power density sensitivity and NIR wavelength sensitivity of bulk microcrystals could be improved via co-doping Li + /Lu 3+ ions. More interestingly, co-doping ions with different valences affect the emission color tendency at 1550 nm excitation, which is contrary to previous reports. The emission color of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals transform from yellow to bright green color through adjusting pump power density and pump wavelength (980 nm and 1550 nm). Moreover, the mechanism of the results has been systematically discussed. The tunable emission colors of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals can be easily distinguished with naked eyes and difficultly counterfeited. Therefore, the upconversion materials have a promising application in transparent anti-fake printing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jinkun Liu,Yimeng Luo,Zhun Ran,Fenglin Wang,Minhua Sun,Yangyang Luo,Jianle Zhuang,Xuejie Zhang,Bingfu Lei,Yingliang Liu,Chaofan Hu
The room temperature afterglow (RTA) of carbon dots (CDs) and their wide-ranging application prospects have attracted significant attention. However, most of the synthesis and regulation methods for multicolor CDs-based RTA materials are complex. Therefore, it is still a challenge to obtain a series of CDs-based RTA materials with broad and tunable emission wavelengths via a simple preparation method using the same organic precursor and matrix. In this study, a series of CDs@Al 2 O 3 materials with ultra-broad afterglow emission range (376 ∼ 619 nm) were prepared by regulating the reaction temperature through a one-step calcination method. High-temperature consumption led to a decrease of surface functional groups and conjugation size of CDs, resulting in the gradually blue-shifted emission from red to UV region. We also discovered a unique phenomenon where the afterglow emission mode of the material shifted from room temperature phosphorescence (RTP) to thermally activated delayed fluorescence (TADF) as the temperature increased, attributed to the stabilization of the excited triplet state from the strengthened crystallinity of Al 2 O 3 matrix. Furthermore, a continuous emission at ∼ 471 nm attributed to the oxygen defects of the matrix was observed. Multiple anti-counterfeiting, information encryption, and fingerprint detection are demonstrated based on the unique RTA properties of CDs@Al 2 O 3 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yuqing Sun,Bo Zhang,Caili Zhang,Huiming Lu,Yuan Yang,Bingyang Han,Fenghao Dong,Jiawei Lv,Shengjun Zhang,Zhao Li,Ziqiang Lei,Hengchang Ma
Highly fluorescent covalent organic frameworks (COFs) are rarely obtained because of the π–π stacked layers with aggregation-caused quenching behavior. Unarguably, highly fluorescent COFs with tunable emission colors are even more rarely achieved. Herein, a general strategy to modify the classical COF material (named COF-1) by different fluorescent molecules via N → B interaction was developed. In this method, the boron-containing COF-1 acted as a porous and crystalline matrix as well as a reaction partner of Lewis acid; after interacting with fluorescent molecules with the anchoring group of pyridine (Lewis base), COF-1 takes a gorgeous transfiguration from a non-emissive powder into a highly fluorescent COF material with tunable emission colors. This disclosed method endowed the typical COFs with new emissive life and is speculated with the general research concept for all boron-containing COFs. Benefiting from the prominent fluorescent emission in the aggregation state, sensitive probes toward amines are achieved.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2019
·Vol. 15
·期 44
·1903496
·
IF 10.856
Qingsong Hu,Guangda Niu,Zhi Zheng,Shunran Li,Yanan Zhang,Haisheng Song,Tianyou Zhai,Jiang Tang
Recently, Bi-doped Cs 2 Ag 0.6 Na 0.4 InCl 6 lead-free double perovskites demonstrating efficient warm-white emission have been reported. To enable the solution processing and enrich the application fields of this promising material, here a colloidal synthesis of Cs 2 Ag 1− x Na x In 1− y Bi y Cl 6 nanocrystals is further developed. Different from its bulk states, the emission color temperatures of the nanocrystal can be tuned from 9759.7 to 4429.2 K by Na + and Bi 3+ incorporation. Furthermore, the newly developed nanocrystals can break the wavefunction symmetry of the self-trapped excitons by partial replacement of Ag + ions with Na + ions and consequently allow radiative recombination. Assisted with Bi 3+ ions doping and ligand passivation, the photoluminescence quantum yield of the Cs 2 Ag 0.17 Na 0.83 In 0.88 Bi 0.12 Cl 6 nanocrystals is further promoted to 64%, which is the highest value for lead-free perovskite nanocrystals at present. The new colloidal nanocrystals with tunable color temperature and efficient photoluminescence are expected to greatly advance the research progress of lead-free perovskites in single-emitter-based white emitting materials and devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Ruijing Fu,Junpeng Gao,Pinsen Zhang,Lingrui Wang,Bo Wang,Guangxia Wang,Xiaoshuang Li,Youchao Kong,Qingguang Zeng,Guanjun Xiao
Manganese (Mn)-based organic–inorganic metal halides (OIMHs) are extensively employed in various optical applications due to their non-toxicity, superior optical properties, and tunable emission advantages. Developing effective strategies to enhance the optical properties of these materials and clarifying their structure–optical property relationships continue to be of significant interest. Here, we report that the zero-dimensional (0D) (C24H20P)2MnBr4 exhibits remarkable pressure emission tuning that shifts from green to red, a phenomenon driven by the enhancement of the crystal field splitting energy and the reduced energy difference of the lowest d–d transition (4T1 → 6A1) motivated by the shortening of Mn–Br bonds. Additionally, the band gap value of (C24H20P)2MnBr4 becomes 3.13 eV, showing an unexpected decrease by 1.09 eV from an initial value of 4.22 eV, when the pressure is released from 31.0 GPa. The incomplete recovery of the distortion in [MnBr4]2− tetrahedra, impeded by the distortion of soft organic macromolecules, is believed to be responsible for band gap narrowing. Combined with computations and subsequent experiments, it is inferred that pressure induced reduction in the Mn–Br bond distance contributes to the distortion of tetrahedral [MnBr4]2− and larger-sized organic cations. Our work not only elucidates the structure–optical property relationships in Mn-based OIMHs, but also opens new avenues for modulating their optical properties and devising innovative strategies for designing novel Mn-based OIMHs.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yafei Tao,Mingming Zhang,Deyu Li,Kang Liu,Jixiang Xu,Lulu Wei,Kai Zhang,Yunhu Wang,Fangxu Dai,Lihua Teng,Lei Wang,Zhanchao Wu,Jun Xing
Metal halide perovskites are promising optoelectronic materials due to their outstanding luminescent properties. However, the instability of perovskites has long been the bottleneck to their practical applications. Here Cs 4 PbBr 6 nanocrystals based glass composite (Cs 4 PbBr 6 NCs@glass) are successfully prepared, which displays green emission color (520 nm), narrow bandwidth (23 nm) and a near-unity photoluminescence quantum yield (PLQY). The H 2 O molecules permeating in the lattice of Cs 4 PbBr 6 were found to be a crucial role in the subband energy emission. The Cs 4 PbBr 6 NCs@glass has excellent emission stability; maintains 93 % of initial PL intensity after ultraviolet light irradiation for over 5000 h. In addition, by adjusting the halogen content, we have achieved tunable emission color from blue (450 nm) to green (520 nm) and red (670 nm) on Cs 4 PbX 6 NCs@glass (X = Cl, Br, I), which covers up to 127 % of the National Television Systems Board (NTSC) standard system. Our finding indicates the commercial applications of perovskite materials in lighting and display.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
R.R. Yang,M. Li,Y.F. Zhao,P. Wang,S. Ye
Halogen vacancies are regarded to play a vital role in photo-induced phase segregation and the resulting switchable emission colors in the soft mixed-halide perovskites ; however, its control strategy via the balanced Pb 0 defects remains a big challenge. The research reports the regulation of synthesis and photochromic behavior via interfacial Eu 3+ /Eu 2+ -Pb 0 /Pb 2+ redox in composites of porous Ca 0.9 Eu 0.1 MoO 4 and nominal mixed-halide perovskite CsPbCl 1.5 Br 1.5 . The composite takes full advantage of Eu 3+ ions with the concerns of its luminescence and variable valences. It provides an additional emission color besides the halide perovskite, manipulates the Pb 0 defects and the resulting Br-rich domain via interfacial redox reaction in the composites. The more contents of surfaced Eu 3+ caused by substituting the unequivalent Ca 2+ ions and the high volume-to-surface ratio of the porous Ca 0.9 Eu 0.1 MoO 4 guarantees the interfacial access for the Eu 3+ and the halides. The research provides some perspectives on the regulation of ionic valence and photoluminescence of halide perovskites with the use of lanthanide ions. The composites may find potential applications in the anti-counterfeiting field.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
化学
✓ 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）