Core-Shell Structured Upconversion / Lead-Free Perovskite Nanoparticles for Anticounterfeiting Applications. Magnetic and Optical Properties of NaGdF4:Nd3+, Yb3+, Tm3 ... Upconversion Luminescence Figure 1. Nd 3+, Yb 3+, Tm 3+ triple … Introduction. [1–9]. Photon upconversion - Wikipedia Lanthanide ions are ideal candidates for spectral conversion, due to their high luminescence efficiencies and rich energy level structure that allows for great flexibility in the upconversion and downconversion of … Varying the dopants leads to different luminescence. Furthermore, excitation is easily achieved by a commercially available continuous wave (CW) infrared diode laser which is compact, power-rich, and inexpensive [7]. sensitization to enhance the efficiency for upconversion luminescence in NCs.15 This pioneering work triggered research to further increase the upconversion efficiency.16−20 Surprisingly, the concept of dye-sensitized downconversion has so far … Abstract. By optimizing the D2PA structure, we observed a 310-fold UCL enhancement uniformly over a large area and an 8-fold reduction in the luminescence … Herein, temperature-dependent upconversion … Detailed results and conclusions will be discussed. The glasses prepared by a melt quenching method were doped at various Nd2O3 concentrations in compositions (40-x)B2O3 : 40Bi2O3 : 20BaO : xNd2O3 (where x = 0.00, 0.50, 1.00, 1.50, 2.00, and 2.50 in mol%). Lanthanide Ions as Photon Managers for Solar Cells Here we propose a new SBR thermometry by combining the temperature-induced red shift of charge transfer state (CTS) of W-O and Eu-O with the ground state absorption (GSA) and excited state absorption (ESA) of Eu3+. The phenomenon of luminescence concentration quenching exists widely in lanthanide-based luminescent materials, setting a limit on the content of lanthanide emitter that can be used to hold the brightness. In this research, the antibody of the searched hub genes has been proposed to combine with a rare-earth composite for an upconversion luminescence (UCL) and downconversion (DCL) NIR-II imaging strategy for the diagnosis of lung adenocarcinoma (LUAD). The microscopic mechanism of lumi-nescence from lanthanide ions is generally divided into downshift, downconversion, and upconversion [10, 11]. The spectra show two groups of upconversion emission peaks at 561–563 nm and 661–663 nm. In this study, we reported a facile method to simultaneously enhance the upconversion fluorescence and tune the downconversion luminescence of CDs from blue to green light by simply adding H 2 O 2 in a hydrothermal process. Abstract. A series of new multifunctional nanomesoporous materials based on upconversion nanophosphors NaYF 4:Yb,Tm@NaGdF 4 (UCNPs) and lanthanide complexes were designed and synthesized through mesoporous capping UCNPs nanophosphors and linking lanthanide (Ln) complexes. The upconversion (UC) luminescence spectra for the samples (S3, S6, S8, and S9) were recorded upon 1.54 μm pumping with power density of 16 mW/mm 2. A range of nearly monodispersed NaYF4 single-crystal nanorods, hexagonal nanoplates, and nanoparticles have been successfully prepared via a facile wet chemical technology. Visible and ultraviolet upconversion and near infrared downconversion luminescence from lanthanide doped La2Zr2O7 nanoparticles Optical properties of upconversion and downconversion nanoparticles The most important optical properties of UCNPs and DCNPs are upconversion and downconversion luminescence (UCL and DCL). Abstract. Er 3+ doped BST nanoparticles with Aurivillius layered structure are synthesized through common solid-state method. “upconversion” and “downconversion” luminescence proper-ties. With a specially designed composition, highly transparent Yb3+/Er3+-doped fluorosilicate glass ceramic (GC) containing KMnF3 perovskite nanocrystals (NCs) is obtained for the first time. Their biocompatibility, upconversion and downconversion luminescence, and magnetism render these NCs potentially powerful nanoprobes for trimodal imaging. The luminescence from lanthanide ions has been widely applied from science to engineering for the perfect prop-erties of narrow band emission, low toxicity, excellent stability, etc. The upconversion luminescence data of such nanoparticles was analyzed as follows: Firstly, we randomly choose a luminescent area of 84.85μm×84.85μm from the full image of total upconversion luminescence. Upconversion and excited-state absorption (ESA) excitation of green luminescence were studied in Er-doped YSGG pumped at 780–825 nm. Alloys Compd. In vivo near-infrared (NIR) fluorescence imaging is an emerging biomedical imaging modality for use in both fundamental scientific research and clinical practice. It is important to make the distinction between photon upconversion, where real metastable excited states allow for … Remote manipulation of upconversion luminescence. Upconversion luminescence materials combine two or more low energy photons to generate single high energy photons 1 – 3.This nonlinear upconversion is most efficiently achieved by energy transfer upconversion or excited state absorption via long-lived intermediate energy levels of the upconversion luminescence material 4.Unlike the nonlinear … Downconversion means shifting the UV/visible (200-400nm) or near IR (800-1000nm) to longer red light (600-700nm) or … Downconversion of [Nd.sup.3+] in the glasses was studied under two excitations at 585 and 750 nm. Figure 5 shows the upconversion emission spectra of β-NaLuF 4: mol%Er 3+ microcrystals. It was found that Nd:YVO 4 shows different upconversion and downconversion luminescencent behaviors when excited by the diode laser and the femtosecond laser. The emitting intensity of … Photon upconversion belongs to a larger class of processes by which light incident on a material induces anti-Stokes emission. Microchimica Acta – Springer Journals. PDF | We have designed and synthesized NaGdF4:Nd3+, Yb3+, Tm3+ magnetic nanophosphors with combined dual-mode downconversion (DC) and upconversion (UC)... | … An example is the conversion of infrared light to visible light. The proposed spectrometer has three components that are … By ... upconversion, and downconversion , , , . There are several types of luminescence conversions: upconversion, downconversion and downshifting. Further, temperature-dependent upconversion and downconversion photoluminescence properties of KMnF 3:Yb,Er@ZnS nanocrystals show potential for ratiometric luminescence temperature sensing. It is found that as the content of Lu 3+ increases from 0 to 7.5 mol%, the UCL intensity of the red emission first increases and then decreases, with the optimum doping content of Lu 3+ ions of 2.5 mol%. Abstract. We … Abstract. Multiple quanta of energy such as photons or phonons are absorbed, and a single photon with the summed energy is emitted. @article{Wang2018RemoteMO, title={Remote manipulation of upconversion luminescence. We discuss the upconversion luminescence efficiencies of phosphors that generate red, green, and blue light. Obviously, the four samples exhibit quite different emission intensities and peak positions. Highly-crystalline Gd-based fluoride upconversion (UC) nanocrystals, including orthorhombic-phase GdF 3:Yb/Er nanoplates (NPLs), hexagonal-phase NaGdF 4:Yb/Er NPLs, monoclinic-phase K 3 GdF 6:Yb/Er nanoribbons (NRs), and orthorhombic-phase KGdF 4:Yb/Er NRs are controllably synthesized through a simple yet robust method, with all of the products … Luminescent bulk materials generally suffer from thermal quenching, while upconversion nanocrystals (UCNCs) have recently been found to show increase of dramatic emission at elevated temperatures. Exceptional modulation of upconversion and downconversion near-infrared luminescence in Tm/Yb-codoped ferroelectric nanocomposite by nanoscale engineering E. Pan, G. Bai, J. Zhou, L. Lei and S. Xu, Nanoscale, 2019, 11, 11642 DOI: 10.1039/C9NR02532D There are three basic mechanism for photon upconversion in inorganic materials and at least two distinct mechanisms in organic materials. In inorganic materials photon upconversion occurs through energy transfer upconversion (ETU), excited-state absorption (ESA) and photon avalanche (PA). The upconversion luminescence from 500 to 700nm was also measured at different pump powers to examine its dependence on the pump power. Thus, the resulting core/shell particles exhibited unique up/downconversion luminescence from doped lanthanide metal ions and transition-metal ions, respectively. The luminescence of lanthanide ions has attracted continuous research interest because of its merits, such as high photostability, sharp emission peaks, and tunable luminescent lifetime , . Novel upconversion nanoparticles−CsPbX3 (UCX3) nanocomposites are fabricated via seeded growth strategy. The FA-conjugated nanocrystals have been tested for their applicability in fluorescence imaging of HeLa cells. On the basis of the difference between the absorption and emission radiant energy, people have divided luminescence into upconversion (UC) emission and downconversion (DC) emission . Physics. technique is called fluorescence ‘upconversion’ or ‘downconversion’ for sum or difference frequency gen-eration, respectively. However, such particles are inadequate for in vitro live-cell imaging and single-particle tracking, as high excitation power can cause photodamage. NBT ceramics have low vibrational energy, which is preferable for downconversion and upconversion (UC) luminescence, and can decrease the probability of the non-radiative transitions , . downconversion fluorescence, such as low background light and nonfading. Their photoluminescence properties, decay time, illumination time and brightness, lifetime are superior to other NPs and also allow the introduction of tunable … To this end, effective strategies have been developed to enhance upconversion luminescence, thus paving the way for new biological approaches and inexpensive energy conversion methods. We investigated the upconversion and downconversion luminescence in (Tb³⁺, Yb³⁺) and (Tb³⁺, Yb³⁺) co-doped lithiumlanthanum- aluminosilicate oxyfluoride glass. The calculations agree well with the experimental results. Such properties have long been exploited in the development of luminescence-based sensors. Moreover, the sample gives near-infrared downconversion emission (1530 nm 4 I 13/2 → 4 I 15/2). Research on spectral conversion is focused on organic dyes, quantum dots, lanthanide ions, and transition metal ion systems for up- and downconversion [13,17,18]. Upon excitation at 980 nm, where crystalline CdTe solar cells no longer absorb, the sub-bandgap photons can be converted to the higher … nanoparticles on the visible upconversion and near-infrared downconversion luminescence intensities. Upconversion can take place in both organic and inorganic materials, through a number of different mechanisms. Crossref Google Scholar Journal. 2.8 Luminescence of Nano Particles of Rare-Earth Phosphors 55 ... 6 Upconversion Phosphors 133 J. Freek Suijver 6.1 Introduction 133 6.2 Theory of Upconversion 137 6.2.1 Absorption and Excitation Spectroscopy 139 ... 8.4.1.1 Downconversion for White Light Generation 209 Physical, optical, and luminescence properties of Nd3+ ions in bismuth barium borate glass system were studied. The upconversion luminescence spectrum under the 800 nm femtosecond pulsed laser excitation is shown in Figure 3b. DOI: 10.1039/c8cs00124c Corpus ID: 49185559. Here, we introduce a concept involving energy harvesting by a strong absorber and subsequent energy transfer to a lanthanide that largely alleviates concentration quenching. Besides chemical sensing, luminescence thermometry is one of the most … The phosphors studied are single crystals and powders codoped with Er3+ and Yb3+ and with Tm3+ and Yb3+. Metal–organic frameworks (MOFs) have attracted much attention in photo- and electrocatalytic CO 2 reduction into value-added chemicals. As an alternative to upconversion, one can also manipulate lanthanide nanoparticles for a down-converting application. The obtained UCNPs@mSiO2-Ln(dbm)4 (Ln = Eu, Sm, Er, Nd, Yb) materials can achieve downconversion and upconversion luminescence to show multicolor emission (covering the spectral region from 450 nm to 1700 nm) under visible-light excitation and 980 nm excitation, respectively. Up-conversion luminescence is a process of luminescent substances absorbing long-wavelength radiation while emitting short-wavelength radiation, and a different luminescence from traditional photoluminescence. The rare-earth ions are preferentially accumulated in regions embedded with KMnF3 NCs; as a result, a remarkably enhanced (by an order of magnitude) single-band red upconversion luminescence … The upconversion luminescence data of such nanoparticles was analyzed as follows: Firstly, we randomly choose a luminescent area of 84.85μm×84.85μm from the full image of total upconversion luminescence. Stronger luminescence peak intensity was observed when excited by 585 nm in comparison to 750 nm excitation wavelength. High luminescence intensity upconversion nanoparticles (UCNPs) have previously been achieved by doping with high amounts of rare-earth ions using high excitation power (>2.5 MW/cm 2). Due to its excellent physical and chemical properties, including exceptional optical … The effect of Er 3+ to Yb 3+ concentration ratio on upconversion emission are investigated and possible … Enhanced multimodal luminescence and ultrahigh stability Eu3+-doped CsPbBr3 glasses for X-ray detection and imaging Summary by David Paganin. It can emit ultraviolet (UV) visible light or near-infrared (NIR) luminescence upon NIR light excitation. On the basis of its numerous surface hydroxyl groups, UCNP-g-HPG can be tailored by a representative fluorescent dye rhodamine B to afford a UCNP-g-HPG-RB nanohybrid that simultaneously presents upconversion and downconversion luminescence. Light Sci. Based on changes in the incident and released photon wavelengths, that fluorescence is classified as either downconversion or upconversion. These as-prepared nanocrystals not only present novel room-temperature downconversion (DC) and upconversion (UC) … The unique luminescent mechanism of UCNPs provides premier optical properties and prospects for widespread applications. We investigated the upconversion and downconversion luminescence in (Tb 3+, Yb 3+) and (Tb 3+, Yb 3+) co-doped lithiumlanthanum- aluminosilicate oxyfluoride glass.Upon excitation at 980 nm, where crystalline CdTe solar cells no longer absorb, the sub-bandgap photons can be converted to the higher-energy ones via upconversion. Appl. Studying upconversion and downconversion luminescence, how I can vary thickness of spacer in lab? By manipulating the ion diffusion and shell growth kinetics, the upconversion and downconversion luminescent performance of KMnF 3 :Yb,Er@ZnS nanocrystals are further optimized and the related … 5 , e16136 (2016). 701 806–15. However, the traditional methods Singlet fission and photon upconversion The luminescence efficiency of solid-state lasers is closely related to the fluorescence characteristics of their gain media. Spectral conversion for solar cells is an emerging concept in the field of photovoltaics, and it has the potential to increase significantly the efficiency of solar cells. Under the 980 nm excitation, the sample gives a set of upconversion light: very strong red emissions near 655 and 679 nm (4 F 9/2 → 4 I 15/2), very weak green (525 nm 2 H 11/2 → 4 I 15/2, 544 nm and 557 nm 4 S 3/2 → 4 I 15/2). 35% for downconversion and upconversion, respectively, both calculated for the standard 1,000-W/m2 air mass (AM) 1.5 solar spectrum. … Among the three temperature measurement methods, the material has the highest sensitivity under the downconversion temperature measurement … Moreover, the sample gives near-infrared downconversion emission (1530 nm 4 I 13/2 → 4 I 15/2). 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