61894-01-7Relevant articles and documents
Luminescence properties of Tm3+ ions single-doped YF3 materials in an unconventional excitation region
Chen, Yuan,Liu, Qing,Lin, Han,Yan, Xiaohong
, p. 505 - 510 (2018)
According to the spectral distribution of solar radiation at the earth's surface, under the excitation region of 1150 to 1350?nm, the up-conversion luminescence of Tm3+ ions was investigated. The emission bands were matched well with the spectr
Size and morphology-controlled synthesis of vernier yttrium oxyfluoride towards enhanced photoluminescence and white light emission
Dong, Jianchao,Xiong, Hailong,Wang, Xiaoxue,Song, Lina,Liu, Yali,Yang, Junfeng,Wu, Hongyue,Yang, Chunming,Gan, Shucai
, p. 11351 - 11357 (2018)
In this study, a class of vernier yttrium oxyfluoride (Y5O4F7 denoted as V-YOF) with a variety of shapes and sizes was formed by adjusting the crystal growth environment; after calcination, the samples can maintain the morphology of the precursor; this may be attributed to the topotactic chemical transformation. A comparison of the fluorescence results shows that the hexagonally shaped microcrystal strips can effectively improve the light-emitting characteristics; further, to explore the growth mechanism of precursors, time-dependent experiments and three-dimensional growth simulations have been carried out. They suggest that the formation of hexagonal strips may be due to the unique way that the crystals grow from the interior space to the outer wall. Moreover, Tm3+/Dy3+-codoped V-YOF phosphors exhibit excellent white light emission (CIE: x = 0.338, y = 0.313 close to that of standard white light (0.33, 0.33)) due to energy transfer. These results confirm that the V-YOF phosphors may have potential applications in the field of luminescent materials.
Improving upconversion emission of NaYF4:Yb3+, Er3+ nanoparticles by coupling Au nanoparticles and photonic crystals: The detection enhancement of Rhodamine B
Ma, Yingjin,Zhu, Jialun,Yang, Zhengwen,Zhang, Hailu,Qiu, Jianbei,Song, Zhiguo
, p. 1265 - 1273 (2019)
The upconversion (UC) nanoparticles (NPs) based sensor exhibits the potential application for the detection of dyes, heavy metal ions and DNA et al. However, the application of upconversion NPs based sensor was limited due to its low UC luminescence intensity. In the present work, the SiO2 opal photonic crystals were prepared by the self-assembly technology. After infiltration of SiO2 opal by the transparent chloroauric acid solution and the following sintering at the high temperature, the Au NPs/opal hybrids were prepared. The Au NPs/opal hybrids result in the enhancement of excited electric field, which can be served as the template of UC emission enhancement of NaYF4:Yb3+, Er3+ NPs exited at the 980 nm. The corresponding maximum UC emission enhancement was about 17-fold. The detection of Rhodamine B was realized by monitoring the changing of green UC intensity of NaYF4:Yb3+, Er3+ NPs. In comparison with pure NaYF4:Yb3+, Er3+ NPs, the sensor sensitivity of NaYF4:Yb3+, Er3+ NPs deposited on the Au NPs/opal hybrid was increased by about the 35-factors, which exhibits a low detection limit of 164 μM and a high sensitivity of 1.15 μM?1. The present work demonstrated that this solid sensor exhibits potential applications in heavy metal ions and DNA et al.
NIR Luminescence Enhancement of YVO4:Nd Phosphor for Biological Application
Tanaka, Júlio Tadashi,Moscardini, Susane Bonamin,do Nascimento Melo, Willian Eurípedes,Brunckova, Helena,Nassar, Eduardo José,Rocha, Lucas Alonso
, p. 209 - 217 (2021)
This work reports two systematic studies related to yttrium vanadate (YVO4) phosphors. The first evaluates how the annealing temperature and V5+/Y3+ molar ratio determine the emergence of a single YVO4 tetragonal phase, whereas the second concerns the optimal Nd3+ concentration to improve the infrared emission properties for bio-labelling applications. The YVO4:Nd phosphors were synthesized by adapting the non-hydrolytic sol–gel route. For the first study, samples containing different V5+/Y3+ molar ratios (1.02, 1.48, 1.71, or 3.13) were obtained. For the second study, YVO4:Nd phosphors containing different Nd3+ concentrations (1.0, 3.0, 5.0, or 10.0% in mol) were prepared. X-ray diffractometry and RAMAN spectroscopy results revealed that, regardless of the heat-treatment temperature, the V5+/Y3+ molar ratio of 1.48 was the best composition to avoid undesired phases like Y2O3 and V2O5. Photoluminescence results indicated that the sample containing 3.0% in mol of Nd3+ and annealed at 1000?°C presented the best infrared emission properties. This sample displayed an intense broad band in the ultraviolet region, which was ascribed to the VO43? charge transfer band, as well as several bands in the visible and infrared regions, which were attributed to the Nd3+ intraconfigurational f-f transitions. Regardless of the excitation wavelength (ultraviolet, visible, or near-infrared), the mean radiative lifetime was about 12.00 μs. The prepared phosphors presented absorption and emission bands in the biological window (BW) regions, which are located between 750 and 900?nm and between 1000 and 1300?nm, so they are candidates for applications in medical imaging and diagnoses.
A convenient preparation of nano-powders of Y2O3, Y3Al5O12 and Nd:Y3Al5O12 and study of the photoluminescent emission properties of the neodymium doped oxide
Belli Dell'Amico, Daniela,Biagini, Paolo,Bongiovanni, Giovanni,Chiaberge, Stefano,Di Giacomo, Alessio,Labella, Luca,Marchetti, Fabio,Marra, Gianluigi,Mura, Andrea,Quochi, Francesco,Samaritani, Simona,Sarritzu, Valerio
, p. 149 - 157 (2018)
[Y(O2CNBu2)3], has been prepared by extraction of the Y3+ ions from aqueous solution into heptane by the NHBu2/CO2 system. Exhaustive hydrolysis of [Y(O2CNBu2)3] produced the yttrium carbonate [Y2(CO3)3?n H2O] (n = 2–3), that was converted to Y2O3 by thermal treatment at 550 °C for 12 h. The exhaustive hydrolysis of [Y(O2CNBu2)3] and [Al(OBu)3] (Y/Al molar ratio = 3/5) carried out at room temperature yielded an intermediate mixed carbonate, that, upon heating at 950 °C for 12 h, was converted to Y3Al5O12. The exhaustive hydrolysis of [Y(O2CNBu2)3] and [Al(OBu)3] was repeated in the presence of [Nd(O2CNBu2)3] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3:5). The neodymium doped garnet Nd:Y3Al5O12 was obtained, through the intermediate formation of a mixed hydroxo-carbonate. For comparison, the neodymium doped garnet was prepared also starting from N,N-dialkylcarbamato complexes of all three metals, [Y(O2CNBu2)3], [Nd(O2CNBu2)3] and [Al2(O2CNiPr2)6] (Nd/Y molar ratio = 0.07;(Nd + Y)/Al molar ratio = 3:5). Also in this case the intermediate mixed hydroxo-carbonate, after heating at 950 °C for 12 h, evolved to Nd:Y3Al5O12. FTIR, XRD, SEM, TGA measurements were used for the characterization of the obtained materials. Preliminary studies of the photoluminescent emission properties were carried out on Nd:Y3Al5O12. Photoluminescence dynamics have been investigated by means of femtosecond laser pulses and nanosecond temporal resolution up to the millisecond range after excitation. All the luminescence traces have shown a decay time of the order 200 microseconds indicating its potential as a laser medium for infrared emission at 1064 nm.
Histone H2A-peptide-hybrided upconversion mesoporous silica nanoparticles for bortezomib/p53 delivery and apoptosis induction
Chen, Hongling,Ge, Yakun,Lao, Jun,Li, Pengcheng,Lou, Dawei,Rong, Jiamin,Wu, Jie,Zhang, Renwen,Zhang, Yuanxin
, (2020)
The design and development of advanced gene/drug codelivery nanocarrier with good biocompatibility for cancer gene therapy is desirable. Herein, we reported a gene delivery nanoplatform to synergized bortezomib (BTZ) for cancer treatment with histone H2A-hybrided, upconversion luminescence (UCL)-guided mesoporous silica nanoparticles [UCNPs(BTZ)?mSiO2-H2A]. The functionalization of H2A on the surface of UCNPs(BTZ)?mSiO2 nanoparticles realized the improvement of biocompatibility and enhancement of gene encapsulation and transfection efficiency. More importantly, then UCNPs(BTZ)?mSiO2-H2A/p53 induced specific and efficient apoptotic cell death in p53-null cancer cells and restored the functional activity of tumor suppressor p53 by the success of co-delivery of BTZ/p53. Moreover, the transfection with UCNPs(BTZ)?mSiO2-H2A/p53 in p53-deficient non-small cell lung cancer cells changed the status of p53 and substantially enhanced the p53-mediated sensitivity of encapsulated BTZ inside the UCNPs(BTZ)?mSiO2/p53. Meanwhile, core-shell structured mesoporous silica nanoparticles UCNPs?mSiO2 as an UCL agent can detect the real-time interaction of nanoparticles with cells and uptake/penetration processes. The results here suggested that the as-developed UCNPs(BTZ)?mSiO2-H2A/p53 nanoplatform with coordinating biocompatibility, UCL image, and sustained release manner might be desirable gene/drug codelivery nanocarrier for clinical cancer therapy.
Multifunctional polyoxometalates-modified upconversion nanoparticles: Integration of electrochromic devices and antioxidants detection
Zhai, Yanling,Zhu, Chengzhou,Ren, Jiangtao,Wang, Erkang,Dong, Shaojun
, p. 2400 - 2402 (2013)
We report a novel design, based on a combination of lanthanide-doped upconversion nanoparticles and polyoxometalates, for electrically controlled fluorescence switches and sensitive detection of antioxidants in aqueous solution.
Formation Mechanism, Structural, and Upconversion Properties of Alkaline Rare-Earth Fluoride Nanocrystals Doped with Yb3+/Er3+ Ions
Grzyb, Tomasz,Przybylska, Dominika
, p. 6410 - 6420 (2018)
Ultrasmall (9-30 nm) Yb3+/Er3+-doped, upconverting alkaline rare-earth fluorides that are promising for future applications were synthesized by the microwave-assisted hydrothermal method. The formation mechanism was proposed, indicating the influence of the stability of metal ions complexes with ethylenediaminetetraacetic acid on the composition of the product and tendency to form M2REF7 (M0.67RE0.33F2.33) cubic compounds in the M-RE-F systems. Their physicochemical properties (structure, morphology, and spectroscopic properties) are compared and discussed. The obtained nanoparticles exhibited emission of light in the visible spectra under excitation by 976 nm laser radiation. Excitation and emission spectra, luminescence decays, laser energy dependencies, and upconversion quantum yields were measured to determine the spectroscopic properties of prepared materials. The Yb3+/Er3+ pair of ions used as dopants was responsible for an intense yellowish-green emission. The upconversion quantum yields determined for the first time for M2REF7-based materials were 0.0192 ± 0.001% and 0.0176 ± 0.001% for Sr2LuF7:Yb3+,Er3+ and Ba2LuF7:Yb3+,Er3+ respectively, the two best emitting samples. These results indicated the prepared materials are good and promising alternatives for the most studied NaYF4:Yb3+,Er3+ nanoparticles.
Optical properties of Sr2YF7 material doped with Yb3+, Er3+, and Eu3+ ions for solar cell application
Dao, Van-Duong,Huy, Bui The,Kwon, Dae Hyun,Lee, Seong-Soo,Lee, Yong-Ill,Truong, Hai Bang
, (2021/12/20)
The optical properties and applications of lanthanide-doped upconversion materials have been emerged due to their advantages such as high penetrated length, low ratios of signal and noise, and low toxicity. In this study, we present the preparation of Sr2YF7 (SYF) doped with Yb3+, Er3+, and Eu3+ ions and its application as a component of the working electrode for solar cells. The prepared material exhibits strong upconversion emission, which originated from Yb-Er pairs under an excitation of 980 nm wavelength, and down-shifting emission-related with Eu3+ ions. The material was characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), FE-SEM, and fluorescent spectroscopy. The performance of color emission was evaluated by Commission International de I′Eclairage (CIE) chromaticity coordinates. J-V measurements were performed for estimating the contribution of the prepared material on the power conversion efficiency of dye-sensitized solar cells. The power conversion efficiency of dye-sensitized solar cells containing SYF3-coated TiO2 was increased by 20.9% versus those using undoped SYF - TiO2.
Variation of structural disorder in Zr substituted Y2Sn2O7: Its impact on photocatalysis
Bhattacharyya, Kaustava,Mandal, Balaji P.,Nayak, Chandrani,Nigam, Sandeep,Sudarsan, V.,Tyagi, Avesh K.,Zain, Jerina Hisham
, (2021/08/06)
Variation in degree of disorder and its impact on photocatalytic dye degradation has been studied in Y2Sn2-xZrxO7 series. The structural variations of the compositions were thoroughly characterized by X-ray diffraction, Raman spectroscopy, 119Sn MAS NMR, EXAFS and XPS. A phase transition from ordered pyrochlore to disordered fluorite could be observed in the series whilst transiting from Y2Sn2O7 to Y2Zr2O7 without any signature of presence of bi-phasicity. Formation of a random solid solution phase has been confirmed by 119Sn MAS NMR results. All the compositions until x ?= ?1.0 remain as pyrochlore whereas the compositions with x ?≥ ?1.5 preferentially adopt defect-fluorite structure. X-ray photoelectron spectroscopy clearly demonstrates that the coordination environment Zr and O varies with increase in Zr content, however, the coordination environment of Sn does not alter with substitution. The phase transformation from pyrochlore to defect fluorite occurs at relatively higher Zr rich composition than expected from classical radius ratio rule due to higher covalency present in Sn–O bond. With increase in Zr content in the series crystallite size, surface charge, nature BO6 octahedra etc. varies and it has been found that these parameters has strong bearing on catalytic property of the materials. A generic understanding for the photocatalytic degradation of cationic methylene blue dye was achieved as a function of structural disordering in the Y2Sn2-xZrxO7 system.
