JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 31
·23880-23887
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IF 2.478
Ding Yanli,Zhang Xiaodan,Zhao Ying
The use of upconversion (UC) materials is an effective strategy for harvesting the near-infrared (NIR) solar photons in perovskite solar cells. Hexagonal β-NaLuF 4 :Yb,Er submicron prisms were synthesized by a facile solvothermal method. Gd 3+ doping is used to enhance the UC emission intensity. We investigated how the concentration of Gd 3+ ions affected the morphological evolution, microstructure, and luminescence performance of NaLuF 4 :Yb,Er and explored the mechanism for improving luminescence at 980 nm excitation. By incorporating the optimized NaLuF 4 :Yb,Er,Gd into the perovskite solar cells’ (PSCs) hole transport layer, the short-circuit density ( J sc ) of UC-PSCs can be enhanced from 19.31 to 21.77 mA cm −2 .
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JOURNAL OF CONTROLLED RELEASE
·
2019
·
IF 7.901
Hui Xiong,Cheng Wang,Zihan Wang,Zhijie Jiang,Jianping Zhou,Jing Yao
Estrogen receptor-positive (ER+) breast carcinoma therapy faces the challenges of estrogen receptors heterogeneity and endocrine therapy resistance. Selectively attacking glutathione (GSH) biosynthesis which is the metabolic vulnerability of ER+ breast carcinoma could bypass conventional treatment limitations through blocking oxidative stress disorders-driven tumor cell proliferation . Herein, we developed drug-organics-inorganics self-assembled nanosystem (DFTA) with doxorubicin (DOX) as chemotherapeutic agent, ferric chloride (FeCl 3 ) as ferroptosis inducer and tannic acid (TA) as activator of superoxide dismutase (SOD)-like reaction in intracellular cascade for the combined therapy in ER+ breast carcinoma. DFTA displayed a particle size of 106.4 ± 0.7 nm with flat irregular nanonetwork-like shape and predominant photothermal effect produced in the assembly process. The drug release from DFTA could be triggered by photothermal excitation efficiently. ELISA analysis showed that DFTA + laser group significantly reduced intracellular GSH level through reactive oxygen species (ROS)-produced intracellular oxidative stress cascade amplification and photothermal therapy (PT)-mediated ROS production. Furthermore, in vivo antitumor efficiency evaluation showed that the tumor inhibition ratio of DFTA + laser was as high as 93.38 % even though the dosage of iron and DOX reduced by about 9 times and 1.5 times respectively. In summary, our study established a high-efficiency nanosystem based on triple combination therapy of chemotherapy, ferroptosis and PT, which might be a promising nanosystem for effective ER+ breast carcinoma therapy.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Wenwen Zhao,Kuibao Zhang,Weiwei Li,Baozhu Luo,Haibin Zhang,Kai Xu
In this study, transparent LaErZr 2 O 7 ceramic with high excess La and Er contents (nominally La 1.28 Er 1.28 Zr 2 O 7.84 ) was successfully prepared by vacuum sintering at 1850 °C for 6 h using nanosized powder. The XRD , SEM, EDX and TEM results reveal that the single pyrochlore phase in the powder sample transforms to the coexistence of La-rich pyrochlore phase and Er-rich defect fluorite phase after high temperature sintering . The high excess amounts of La and Er favor the formation of pyrochlore structure. Despite the coexistence of two phases, the sample with 1 mm thickness shows excellent in-line transmittance in the visible to mid-infrared region (as high as 81% at 1100 nm). The upconversion and infrared emission under 980 nm exciting were measured and discussed as well.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 38
·10226-10232
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IF 5.976
M. Yuan,R. Wang,C. Zhang,Z. Yang,W. Cui,X. Yang,N. Xiao,H. Wang,X. Xu
Exploiting new transitions in the visible light range is important in the development of advanced color displays, superior laser materials, and novel optical devices. Here, for the first time, we observed several intensive upconversion (UC) emission bands at 382, 472, 506, 560, and 618 nm from a single β-NaYF4:Yb/Er microcrystal via saturated excitation. Compared to the traditional red (650 nm) and green (545 nm) UC emissions, these new emission bands intensify rapidly as the excitation intensity increases, which leads to full-color UC luminescence in the visible region. Nearly white luminescence was elicited from a single microcrystal with a relatively high excitation power. Moreover, the mechanism of these newly observed UC emissions was elucidated by examining the energy migration. It was also found that these microcrystals exhibit waveguide-transmission characteristics and are transparent to their own UC emissions. These findings provide a basis for further exploration of the silent transitions of other rare-earth-ions and demonstrate the potential for using β-NaYF4:Yb/Er microcrystals in a variety of applications in color display and waveguide-based optical devices.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 12
·11043-11053
·
IF 2.195
Zheng Jianfeng,Deng Xueshuang,Zhou Xin,Yu Meidong,Xia Zhetao,Chen Xiaohong,Huang Sumei
We report a strategy to fabricate high quality TiO 2 nanrod array ETLs for efficient PSC devices with Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 triple cation composition perovskite as light absorption material. Mg doped compact TiO 2 (c-TiO 2 ) was employed as seeds for hydrothermal growth of one-dimensional (1D) TiO 2 nanorod (NR) arrays. Assisted with these seed layers, Mg and Er doped TiO 2 rutile NR arrays were synthesized using tetrabutyltitanate (TBT) and Er(NO 3 ) 3 as Ti and Er precursors, respectively. It was found that uniform, straight and vertical TiO 2 NRs with a high area density were formed using Mg and Er co-modification, improving the pore-filling and crystallization of the triple cation perovskites, facilitating charge separation and suppressing recombination at the perovskite/titania NR interface of the PSC device. The shorter PL decay time with Mg/Er doping compared to the cases without Mg or Er doping is assigned to the more excellent electron extraction from the mixed cation perovskite film. The control device without modification shows an average power conversion efficiency (PCE) of 17.10%. Under the same fabrication conditions, doping of the single element Er or Mg or both Mg and Er enhances the average PCE to 17.54, 18.41 and 18.99% respectively. Our champion cell based on Mg/Er modified TiO 2 NR arrays demonstrates a PCE of 19.11%, exhibiting an enhancement of 10.33% compared with that of the PSCs based on unmodified TiO 2 NR arrays (17.32%). This work provides a simple and efficient interface engineering method to improve the efficiency of the mixed cation PSCs.
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Materials Express
·
2018
·Vol. 8
·期 2
·141-148
·
IF 1.597
Tan Haihu,Xie Shaowen,Li Na,Tong Chao,Xu Lijian,Xu Jianxiong,Zhang Changfan
Luminescent polymer composite films were prepared by aqueous solution casting method employing poly(vinyl alcohol) (PVA) as a matrix polymer and NaYF4:Yb, Er up-conversion phosphors (UCPs) as the filler. A series of luminescent UCP/PVA composite films were obtained by varying
the amount of the UCP filler. The effects of UCP incorporation on the structure, morphology, thermal stability and optical properties were also examined. The well-dispersed UCPs in the polymer matrix enhanced the thermal stability of composite films due to hydrogen bonding between the PVA
and UCPs. Besides, the incorporation of UCPs did not greatly decrease the transparency of films but imparted fluorescent properties to the polymer matrix. The fabricated UCP/PVA composite films exhibited strong up-conversion photoluminescence upon the 980 nm laser excitation. The UCP/PVA composite
fluorescent films may have promising application in anti-counterfeiting packaging and in other optics related fields.
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Nanoscale Research Letters
·
2013
·Vol. 8
·期 1
·1-8
·
IF 2.524
Zhou Na,Qiu Peiy,Wang Kan,Fu Hualin,Gao Guo,He Rong,Cui Daxiang
Water-soluble upconversion nanoparticles (UCNPs) were prepared by a one-pot procedure in a two-phase reacting system. Four kinds of surfactants were tested in the synthesis process as capping agent to tune size and morphology of nanocrystals. Nanoparticles (approximately 70 nm) and rods (400 nm and 2.5 μm) were synthesized, respectively. Then, Fourier transform infrared spectroscopy analysis confirmed the successful linking between UCNP surface and surfactant. Ionic liquids (ILs) and surfactants participated in synthesis process together, competing with each other to cap on UCNPs. ILs still led the competition of capping, while surfactants worked as cooperative assistants to develop functional surface. Further characterizations such as high-resolution transmission electron microscopy and X-ray diffraction indicated the changes in crystallization and phase transformation under the influence of surfactants. In addition, the growth mechanism of nanocrystals and upconversion fluorescence luminance was also investigated in detail. At last, the cytotoxicity of UCNPs was evaluated, which highly suggest that these surface-functionalized UCNPs are promising candidates for biomedical engineering.
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RSC Advances
·
2015
·Vol. 5
·期 115
·94980-94985
·
IF 3.84
Chuanying Wang,Xianhua Cheng
In this work, amino-functionalized NaYF4:Yb,Er upconversion nanoparticles (UCNPs) were synthesized by a hydrothermal method. Then a simple self-assembly method was carried out to prepare a NaYF4:Yb,Er upconversion (UC) film on a silicon (Si) substrate, using γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) as an intermediate coupling agent. The chemical composition and surface morphology of the UC film were characterized using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), water contact angle (WCA), and scanning electron microscopy (SEM) measurements. Furthermore, the tribological properties of the UC film were investigated by a UMT tester. The results indicate that the UC film has been successfully prepared on the Si substrate by the formation of chemical bonds and its lifetime is about five times longer than that of the NaYF4:Yb,Er UCNPs on a bare Si substrate. This work provides a facile way to synthesize a NaYF4:Yb,Er UC film with robust adhesion to the substrate, which can be applicable for other UC films.
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
T. Wei,X.D. Wang,C.Z. Zhao,T.B. Zhang,F.M. Yang,W.B. Wang,Y.J. Ma
Er- and Zr-codoped strontium bismuth niobate ceramics, Sr 0.97 Er 0.03 Bi 2 Nb 2− x Zr x O 9 (SBN x ) with different x (0≤ x ≤0.1), were synthesized by the solid state reaction method. Their structural, up-conversion (UC) photoluminescence , and dielectric properties were investigated. By Rietveld structural refinement, all SBN x samples exhibited a polycrystalline bismuth-layered perovskite structure with space group A2 1 am. With deliberate introduction of Zr 4+ ions in the bismuth-layered perovskite structure, SBN x samples presented simultaneously enhanced UC photoluminescence and dielectric properties. The UC photoluminescence was investigated as a function of Zr 4+ concentration and incident pump power. Under the 980 nm near infrared (NIR) excitation, bright UC green and weak red emissions were observed which corresponded to the transitions from 2 H 11/2 / 4 S 3/2 and 4 F 9/2 to 4 I 15/2 level, respectively. With x increase, the UC luminescence improvement of SBN x can be attributed to the local distortion of crystal field surrounding the Er 3+ activator which induced by different ionic radii of Zr 4+ and Nb 5+ ions. The dependence of UC emission intensity on pumping power showed that two photon energy transfer process was involved in the UC green and red emissions. Furthermore, electrical measurements indicated that the introduction of Zr 4+ distinctly increased the ferroelectric to paraelectric phase transition temperature ( T C ) of SBN x ceramics from 724 K to 762 K as x ranging from 0.0 to 0.1. It is believed that B site doping in SBN x by large Zr 4+ ion is an effective method to improve UC luminescence and electrical properties of this potentially multifunctional optical-electro material.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Mingshun Yang,Jinjun Ren,Ruili Zhang
Water-soluble hexagonal NaScF 4 :Yb/Er upconversion microcrystals (UCMCs) were synthesized using the hydrothermal method . The upconversion photoluminescence properties of NaScF 4 :xYb/2%Er microcrystals (x = 4–20%) were characterized under a 980-nm-wavelength laser excitation. The dependence of red/green (R/G) ratio on the concentration of Yb 3+ ions was investigated. The local environments of dopant ions (Yb 3+ , Er 3+ ) in NaScF 4 were studied using multiple solid-state nuclear magnetic resonance (NMR) techniques. The 19 F single pulse and 19 F{ 23 Na} and 19 F{ 45 Sc} rotational echo double resonance (REDOR) techniques proved that the dopant rare-earth ions (Yb 3+ , Er 3+ ) preferred to substitute Na + rather than Sc 3+ ions. Such solid-state NMR techniques provide a novel approach to study new phosphors.
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JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Xuhua LIANG,Jun FAN,Yongbo WANG,Yanyan ZHAO,Ruyi JIN,Tao SUN,Min CHENG,Xuejun WANG
In this paper, we demonstrated a one-step template-free strategy to fabricate a hollow mesoporous structured NaYF 4 :Yb,Er nanoparticles with excellent upconversion luminescence. Folic acid (FA), a commonly used cancer-targeting agent, was conjugated on the surface of the nanoparticles based on the presence of free amine groups, which were labeled as NaYF 4 :Yb,Er-FA HMUCNPs. The properties were extensively studied, which indicated the obtained samples showed a typical hollow mesoporous structure and excellent upconversion luminescence that were useful for cell imaging and drug delivery. The L929 cells viability, hemolysis assay and coagulation test demonstrated good biocompatibility of the samples. The anti-cancer drug doxorubicin hydrochloride (DOX) storage/release properties were demonstrated to be pH-responsive, in which, the drug release might be beneficial at the reduced pH for targeted release and controlled therapy. Moreover, it was found that DOX-loaded NaYF 4 :Yb,Er-FA HMUCNPs exhibited greater cytotoxicity to KB cells than free DOX due to the specific cell uptake by KB cells via folate receptor-mediate endocytosis. Therefore, the multifunctional nanoparticles combining upconversion luminescent property and hollow mesoporous structure have potential for simultaneous targeted anti-cancer drug delivery and cell imaging.
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TALANTA
·
2016
·
IF 4.035
Yueli Hu,Boyue Wu,Qing Jin,Xueyuan Wang,Yan Li,Yuxiu Sun,Jianzhong Huo,Xiaojun Zhao
5 nm intense green emission NaYF 4 :Yb/Er upconversion nanoparticles (UCNPs) with pure β phase was synthesized with a simple “green” strategy for the first time. Traditional organic solvothermal method is often applied to prepare the high-quality and uniform UCNPs, but the preparation of lanthanide-oleate complexes is laborious as heating and multistep post-treatment for purification are often required. The water-alcohols solvothermal method is environmentally friendly, but the fabricated UCNPs have big size, poor biocompatibility and high cytotoxicity, which limited their application for cell imaging. Herein, NaYF 4 :Yb/Er UCNPs were prepared with rare-earth nitrates RE(NO 3 ) 3 (RE=Y 0.80 Yb 0.18 Er 0.02 ) as precursors and diethylene glycol (DEG)/ethylene glycol (EG)/water as the solvent. A facile green solvothermal method with the temperature being controlled at 300 °C was developed. The as-prepared NaYF 4 :Yb/Er UCNPs were characterized and were found to have enhanced UC emission and controllable particle size. The as-prepared UCNPs were further functionalized via folic acid coating for the targeted imaging and improved bio- compatibility. It was made the UCNPs potential for upconversion bioimaging of living cells by the strong upconversion luminescence, the excellent biocompatibility, and the super-small size. The good colloidal stability and low cell cytotoxicity of the as-prepared UCNPs and the developed synthesis protocol might advance both the fields of UCNPs and biomolecule-based nanotechnology for future studies.
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