OPTIK
·
2021
·
IF 2.443
Kai Ye,Xiaoliang Yang,Siguo Xiao
Bi 3+ , Mn 2+ co-doped CaZnGe 2 O 6 red long afterglow materials were prepared by high temperature solid state reaction method. The phosphor has broad excitation band ranging from 220 nm to 350 nm with two peaks at 255 nm and 300 nm and can give blue, green and red emission band peaking at 448 nm, 530 nm and 645 nm, respectively. Due to the emission properties of Bi 3+ ions and the Bi 3+ →Mn 2+ energy transfer, the co-doped Bi 3+ ions can not only enhance the PL luminescence of the phosphor, but also adjust the emission color. After irradiation of 300 nm ultraviolet light , the phosphors exhibits long-persistent red phosphorescence. Thermoluminescence tests demonstrate that the introduction of Bi 3+ ions can increase the trap depth and trap concentration, greatly improving the afterglow time and brightness of the CaZnGe 2 O 6 : Mn 2+ phosphor. The present work might provide reference for designing new rare earth free red long afterglow materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 1
·333-340
·
IF 6.788
Zhizhen Wang,Zhen Song,Quanlin Liu
Persistent luminescent materials are widely used as night-vision and marking materials in various important fields. Although significant achievements have been made in blue and green persistent luminescent (PersL) materials, the research and development of PersL materials in the warm-color region (550–660 nm) are relatively lacking. Only the orange PersL phosphor Y2O2S:Eu3+,Mg2+,Ti4+ (∼610 nm) and deep red PersL phosphor (Ca1−xSrx)S:Eu2+,Tm3+ (∼650 nm) fulfill the demands of commercial applications. However, sulfide phosphors have poor chemical stability and a relatively short persistent duration time. Herein, we report a series of orange PersL materials, (Sr1−xBax)3SiO5:Eu2+,Nb5+, which exhibit a strong PersL emission band at 550–670 nm and a super-long persistent time of more than 20 h at the 0.32 mcd m−2 threshold value after UV radiation. These new orange PersL materials are compared to the commercial warm-color sulfide PersL phosphor, Y2O2S:Eu,Mg,Ti, with regards to PersL time and brightness, and it is determined that they would have great potential applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Wang Luo,Xintong Zhang,Kaofeng Huang,Bohan Wang,Yu Wang,Zhilie Tang,Kezhi Zheng
Long afterglow materials feature long-lasting luminescence after the cessation of the excitation source. The rising demand for afterglow materials in many applications such as deep tissue imaging, ultrasensitive sensing, and radiation detection has led to extensive research on X-ray-activated afterglow systems. However, the progress in this field is constrained by the limitation and shortage of radiation-induced afterglow materials. Herein, a newly X-ray-excited long afterglow phosphor CaZnOS:Tb 3+ has been developed by using lithium-assisted synthetic protocol. Afterglow properties of Tb 3+ -doped CaZnOS microcrystals are systematically investigated by considering the dopant concentration, reaction temperature, reaction time, reaction atmosphere, and gas flow . As the gas flow of argon atmosphere increases from 0.05 to 0.5 L/min, the CaZnOS:Tb 3+ microcrystals exhibit a distinct change in trap depth from 0.59 to 0.75 eV, corresponding to a gradual increase in afterglow time. Together with thermoluminescence analysis, the long afterglow mechanism is also discussed in this work. These results highlight the importance of reaction gas flow for the efficient regulation of traps and defects in afterglow materials. Furthermore, they provide a fundamental design principle and new route for the creation of lanthanide-doped CaZnOS afterglow phosphors.
研究领域:
材料科学
·
放射医学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 16
·4022-4029
·
IF 7.779
Peng Zhang,Wanying Xie,Zhenbin Wang,Zenggang Lin,Xiuxiang Huang,Zhenghua Ju,Weisheng Liu
Long-persistent luminescence (PersL) materials have shown great promise on account of their diverse utilization in anticounterfeiting and encryption. Nevertheless, time-dependent dynamic multicolor afterglow is rarely reported, especially for single-component oxide-based materials. In this work, a series of LiGa5O8:Eu3+/Tb3+ phosphors exhibit time-dependent dynamic multicolor afterglow from blue to red or green over several seconds after ceasing the excitation. Both experimental and computational data confirm that the color evolution results from different energy transfer processes between traps and luminescent centers. The processes are probably controlled by thermally activated exciton diffusion and the electron tunneling effect. This dynamic multicolor afterglow of LiGa5O8 phosphors allows their applications in anticounterfeiting and encryption with high security levels.
研究领域:
材料科学
·
光学
·
加密技术
·
防伪技术
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 30
·2404888
·
IF 27.4
Shen Shen,Qishan Xie,Smruti Ranjan Sahoo,Jian Jin,Glib V. Baryshnikov,Hao Sun,Hongwei Wu,Hans Ågren,Qingsong Liu,Liangliang Zhu
Confining luminophores into modified hydrophilic matrices or polymers is a straightforward and widely used approach for afterglow bioimaging. However, the afterglow quantum yield and lifetime of the related material remain unsatisfactory, severely limiting the using effect especially for deep-tissue time-resolved imaging. This fact largely stems from the dilemma between material biocompatibility and the quenching effect of water environment. Herein an in situ metathesis promoted doping strategy is presented, namely, mixing ≈10 −3 weight ratio of organic-emitter multicarboxylates with inorganic salt reactants, followed by metathesis reactions to prepare a series of hydrophilic but water-insoluble organic–inorganic doping afterglow materials. This strategy leads to the formation of edible long-afterglow photoluminescent materials with superior biocompatibility and excellent bioimaging effect. The phosphorescence quantum yield of the materials can reach dozens of percent (the highest case: 66.24%), together with the photoluminescent lifetime lasting for coupes of seconds. Specifically, a long-afterglow barium meal formed by coronene salt emitter and BaSO 4 matrix is applied into animal experiments by gavage, and bright stomach afterglow imaging is observed by instruments or mobile phone after ceasing the photoexcitation with deep tissue penetration. This strategy allows a flexible dosage of the materials during bioimaging, facilitating the development of real-time probing and theranostic technology.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Junqing Xiahou,Li Cao,Sai Huang,Tao Zhang,Ji-Guang Li,Qi Zhu
Recently, combining long afterglow materials with organic fluorescent dyes, particularly carbon dots (CDs) to produce heterojunction and improve its luminescence and persistence properties became an important research direction. However, the precise role of these internal defects in the energy transfer process of CD@inorganic matrix composite fluorescent materials has not been thoroughly discussed. Establishing matching trap level to promote the energy transfer between the trap level and CDs level not only helps to enhance the afterglow performance, but also can explain the heterogeneous structure interaction between organic–inorganic fluorescent materials. Herein, ZLAGC@CDs luminescent composite is successfully synthesized via coating CDs on Zn 1- x (Li/Al) x Ga 2 x O 4 :0.005Cr 3+ (ZLAGC, x = 0–1), which exhibits a unique double emission at ≈430 nm (the defect luminescence of CDs) and 718 nm (the 2 E→ 4 A 2 transition of Cr 3+ ). After coating, the energy transfer from the defect level of CDs to the excited state of Cr 3+ enhanced the NIR emission. The electron transfer between the defect level of CDs and the split deeper trap level of ZLAGC also improved the visible and near-infrared (NIR) afterglow. The fluorescence and afterglow signals of ZLAGC@CDs are highly sensitive to solution pH under acidic conditions, indicating that the prepared fluorescent composite has potential application in acid microenvironment fluorescence detection.
研究领域:
材料科学
·
光学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Chun Yang,Feng Zhang,Xiao Liu,Yuxin Du,Di Huang,Jun Liu,Lixia Xie,Guiyin Zhou,Jianxin Tang
An important issue in photocatalysis is the light required to carry out the catalytic reaction, so maintaining photocatalytic reaction activity in the dark has been the ultimate target of expanding photocatalytic technology. Herein, we report a photocatalyst g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ through a strategy that couples the energy-storing and light-releasing properties of long afterglow materials and the light-absorbing properties of photocatalytic materials. g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ is able to effectively degrade methyl orange in water under visible light using molecular oxygen in the air, but it maintains significant methyl orange degradation activity after the light is turned off, as if SAO acts as a built-in light source in it. The photocatalytic degradation mechanism is investigated by active species capture experiments, which shows that superoxide radicals (•O 2 − ), hydroxyl radicals (•OH), holes (h + ), and singlet oxygen ( 1 O 2 ) generate during the photocatalytic process. Among them, •O 2 − is the relatively predominantly acting reactive species. This study exemplifies the design of a continuously working photocatalyst with conceptual value for light storage, which provides ideas for practical energy and environmental system applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Ping Wang,Dongxiao Zheng,Shouxin Liu,Mengkai Luo,Jian Li,Shen Shen,Shujun Li,Liangliang Zhu,Zhijun Chen
Embedding luminogens into a well-selected rigid matrix has been a particularly attractive way of preparing long afterglow materials. On this basis, seeking green, low-cost and sustainable materials or strategies, remains challenging but desirable. Prompted by the generation of wood fluorescence, a general strategy for preparing long afterglow materials successfully developed by embedding biomass-derived carbon dots into cellulose fibrils. Internal hydrogen bonding interactions between cellulose fibrils and carbon dots strongly erected a confinement effect for protecting the triplet exciton from quenching, leading to an increase of phosphorescence lifetime by seven orders of magnitude. These properties, which originated from such a green and convenient approach, were able to match most of reported long afterglow examples. Moreover, thanks to the humidity sensitivity of cellulose, the materials can behave a unique humidity-dependent phosphorescence property, showing superior potential application in advanced anti-counterfeiting and encryption.
研究领域:
材料科学
·
可持续发展
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ou Hai,Jian Li,Mengkang Pei,Qiang Ren,Xiulan Wu
The construction of visible full-spectrum tunable afterglow luminescence is of great significance for long afterglow materials. Here we developed a new composite material whose afterglow were continuously tunable from blue to red light, we prepared CsPbI 3 quantum dots (QDs) by thermal injection method and added passivators to obtain relatively more stable QDs materials, the SDS-CsPbI 3 QDs after passivation treatment was more than twice the photoluminescent (PL) intensity of the original QDs after 10 days, which has a positive effect on the large-scale production and application of all-inorganic perovskite QDs. By uniformly distributing CsPbI 3 QDs on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) by Stöber method, a color-tunable long-persistence luminescent material CsPbI 3 /SMS@SiO 2 was prepared, and the tunable afterglow glows from 465 nm to 700 nm was realized by optical conversion. In addition, the PL intensity of the composite material under ultraviolet light is increased by more than 50%, and it can remain stable for a long time; its high temperature resistance is also improved to 140 °C; and the luminous intensity after 10 days remains at a high level. This research also provides new ideas and methods for the development of multicolor long afterglow materials.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Hongwei Yang,Zhun Ran,Yimeng Luo,Siyuan Liu,Weizhe Xu,Jinkun Liu,Jianghu Cui,Bingfu Lei,Chaofan Hu,Jianle Zhuang,Yingliang Liu,Yong Xiao
Long afterglow materials based on carbon dots (CDs) have attracted extensive attention in the field of optics due to their low cost and nontoxic properties. However, the targeted synthesis of specific properties of complex and unknown structures such as CDs remains a daunting challenge. In this study, the powerful nonlinear fitting ability of machine learning was used to explore the afterglow properties of CDs. The XGBoost algorithm demonstrates high prediction accuracy in determining the optimal excitation wavelength, optimal emission wavelength, and afterglow lifetime. Using Bayesian optimization, we screened and synthesized the CDs-based long afterglow materials with the longest lifetime reported so far by a one-step microwave method. By combining quantum chemical calculations with experimental data, we revealed the structure–function relationship between CDs and their precursors through electron–hole analysis. These results show that machine learning can establish nonlinear correlations between precursors and materials with unknown structures, clarify their intrinsic relationships, simplify the material design process, and thus accelerate the development of advanced materials.
研究领域:
材料科学
·
光学
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 105
·期 2
·500-510
·
IF 2.606
Huang Anding,Wu Yikun,Pan Zixin,Wang Bangyu,Liang Xiaoping
In order to improve the water resistance of SrAl 2 O 4 :Eu 2+ , Dy 3+ , the composite long afterglow material Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ was prepared by covering uniform and stable Sr 2 MgSi 2 O 7 sol on SrAl 2 O 4 :Eu 2+ , Dy 3+ powder, which was synthesized via traditional solid-state method. The effects of various factors, such as the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 , on the structure and luminescent properties of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ were investigated by the response surface method. The results show that the influence extent on both the initial afterglow brightness and water resistance are as follows:the amount of ammonia> the content of H 3 BO 3 > the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 . When the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 is 1.64 mL, 11.10, and 0.006 mol, respectively, both the brightness and water resistance of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ are improved, the water resistance is 0.835 (51.82% higher than that of pure SrAl 2 O 4 ) and the initial afterglow brightness can reach 2793 mcd/m 2 (91.69% higher than that of pure SrAl 2 O 4 ), which were in good agreement with the predicted optimum value of 0.867 and 2720 mcd/m 2 , respectively. Under the optimization conditions, the synergistic action of SrAl 2 O 4 with excellent afterglow properties and Sr 2 MgSi 2 O 7 with high water resistance plays an important role in improving the water resistance without sacrificing brightness. Finally, the water-based light-emitting inks with SMSA as fluorescent pigment exhibit excellent luminescent properties in the dark.
Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 7
·2312-2321
·
IF 3.4
Peng Cai,Hefeng Zhang,Yifu Huang
Organic long afterglow materials can be incorporated into commercial polar polymer in very small amount to significantly reduce cost for application, while gaining excellent mechanical deformability attractively. Their luminescence can be usually enhanced, as the polar polymer can block oxygen diffusion and inhibit inclusion aggregation. However, due to thermal instability of most afterglow materials at high temperature, it is still a great challenge when they are applied for widely used polymer melt in material industry. Herein we report a new afterglow material of doped polymer system by blending a new luminescent, two-dimensional polyamide sheet (TIB-3CPBA-TAPA) with a high-temperature polyamide 6 (γPA6) melt. The excellent thermal stability of TIB-3CPBA-TAPA results from the amide bond-linked, imidazolium salted and conjugated structure. Interestingly, TIB-3CPBA-TAPA/γPA6 is found to emit greenish afterglow luminescence that can last for 4 s at room temperature, only under a loading of 0.1 wt% that harvests the UV exposure efficiently. Different from converting non-afterglow γ crystal (γPA) into afterglow α crystal (αPA), our facile strategy achieves longer afterglow with a higher melting point (220°C) and a tripled quantum yield (1.8%). In addition, the viscoelasticity of the polymer melt is improved by TIB-3CPBA-TAPA with a mechanical toughening effect.
研究领域:
材料科学
·
高分子化学
·
发光材料
✓ 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）