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Amine salts assisted controllable synthesis of the YVO4:Eu3+ nanocrystallines and their Luminescence properties
摘要： The Eu3+ doped YVO4 nanocrystallines with various morphologies were successfully synthesized by an amines (TETA, ETA and EDA) assisted hydrothermal process. By rationally adjusting the adding amount of TETA, ETA and EDA, the trepang-like, globular-like and pineapple-like Eu3+ doped YVO4 nanostructures can be conventionally obtained. The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD patterns indicate that these samples are all of the tetragonal structure. The SEM and TEM results show that the amines additives play an important role in morphology formation. Furthermore, the fluorescence properties of those samples are also systematically studied. Under the excitation of 280 nm, Eu3+ doped YVO4: nanostructures emit strong red fluorescence due to the transitions of 5D1-7F1 and 5D0-7FJ (J =1, 2, 3 and 4) of Eu3+ ions. The intensity of red fluorescence is related to not only the concentrations of Eu3+, but also the types of adding amines. The effective luminescence lifetimes of the trepang-like Y0.9Eu0.1VO4 nanocrystallines, the globular-lik and pineapple-like Y0.95Eu0.05VO4 nanocrystallines are 0.91 ms, 1.02 ms and 1.14 ms, respectively. It is believed that this study is beneficial to promote the development of color display industry.
关键词： hydrothermal,Amine salts,luminescence lifetimes,Eu3+ doped YVO4,fluorescence properties
更新于2025-09-23 15:23:52
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Influences of sol-gel progress on luminescent properties of Li <sub/>1.0</sub> Nb <sub/>0.6</sub> Ti <sub/>0.5</sub> O <sub/>3</sub> :Eu <sup>3+</sup> red phosphor
摘要： Li1.0Nb0.6Ti0.5O3:3wt.%Eu3+ red phosphor was synthesized by sol-gel method. The influences of the pH value and the citric acid(CA)/ metal cations(M) ratio on the luminescent properties of the samples were discussed. The properties of the samples were characterized by X-ray diffraction(XRD) and photoluminescence spectroscopy, respectively. The results showed that the samples were consist of “M- phase”. Under the 466nm excitation, the orange emission at 592nm and the red emission at 612nm could be observed. The emission intensity increased with the increasing of pH value firstly and then decreased. The optimum pH value was 5.5. Moreover, the emission intensity decreased with the increasing of CA/M ratio. The relatively high emission intensity of the sample could be obtained when the CA/M was 3:1. Emission spectra and CIE coordinate of Li1.0Nb0.6Ti0.5O3:3wt.% Eu3+ were superior to commercial red phosphor Y2O3:Eu3+,which showed the red phosphor could have potential application in the White-LED field.
关键词： the red phosphor,Eu3+-doped,emission spectrum,Sol-gel method
更新于2025-09-23 15:23:52
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Characterization and Photoluminescence Property of a New Eu <sup>3+</sup> -doped Phosphor of the K <sub/>2</sub> [Al(B <sub/>5</sub> O <sub/>10</sub> )] Prepared by Precursor Method
摘要： A new phosphor of the K2[Al(B5O10)]:Eu3+ was prepared by annealing of the as-prepared of the precursor of K2[Al(B5O10)]·4H2O:Eu3+ at 300–400 °C, and which has been synthesized under facile hydrothermal conditions. All the samples were characterized by the EDS, XRD, FT-IR, and SEM. A systematic study on their luminescent properties has been performed by the PL and PLE. A series of influencing factors on the luminescent properties were also investigated. The PL and PLE studies reveal that the phosphor of K2[Al(B5O10)]:Eu3+ with optimal luminescent intensity and higher red-orange ratio were obtained by sintering the precursor at 400 °C for 5.5 h, with 9% doping concentration, which suggests that it might as a potential application of the light display systems.
关键词： Precursor method,Luminescent property,Eu3+ doped phosphor,Aluminoborate
更新于2025-09-23 15:22:29
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A downshifting Eu3+ doped glass embedded with concave pyramid microstructure to improve the efficiency of silicon solar cell
摘要： The average photoelectric conversion efficiency (PCE) of a bare mono crystalline silicon solar cell is 14.71(±0.03)% under AM1.5. It decreases to 14.20(±0.005)% when covering an un-doped flat glass on the solar cell, and it goes down to 14.10(±0.005)% by using a 5 wt% Eu3+ doped glass. The absorptions of the Eu3+ doped CPM glass one-to-one match the excitation spectrum at 362, 381, 393, 400, 413 and 464 nm, which are related to the transitions of 7F0→(5D4, 5G2, 5L6, 5D3), 7F1→5D3, and 7F0→5D2, respectively. In addition, a concave pyramid microstructure (CPM) is embedded in the glass surface to increase light transmittance. The average PCE increases to 14.61(±0.07)% when a 5 wt% Eu3+ doped CPM glass covers on the silicon solar cell. Comparing to the un-doped flat glass, a net increase of the PCE is 0.41%, where the 0.16% increment of PCE is from the lighting trapping of the CPM structure, and the downshifting of near ultraviolet (NUV) light by Eu3+ ion donates the other 0.25% increment. It confirms that the as-prepared Eu3+ doped CPM glass has a good downshifting and antireflection function.
关键词： solar cell,photoelectric conversion efficiency,Eu3+ doped glass,rare earths,concave pyramid microstructure
更新于2025-09-12 10:27:22
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Excitonic Luminescence Engineering in Tervalent Europium Doped Cesium Lead Halide Perovskite Nanocrystals and Their Temperature-Dependent Energy Transfer Emission Properties
摘要： Cesium lead halide (CsPbX3 (X=Cl, Br, I)) perovskite nanocrystals (NCs) have revealed brilliant prospect in lighting, display and lasing fields owing to their excellent photoluminescence properties. To dope rare earth ions into halide perovskite, CsPbX3 (X=Cl, Br, I) NCs hosts not only inherit the excellent narrow linewidth excitonic properties but also yield unique photoluminescence emission. Herein, engineering of such excitonic luminescence is achieved in Eu3+ doped CsPbCl3-xBrx (x=0, 1, 1.5, 2, 3) solid solution NCs for the first time. The single doped-NCs present wide color gamut emission covering whole visible spectrum. Blue to green range (400-520 nm) emission is taken on by tunable excitonic photoluminescence of CsPbX3 NCs. Besides, there is a broad red spectra (590-700 nm) originating from emission of the tervalent europium ions in NCs. Meanwhile, a noticeable spin-polarized 5D0→7F1-6 emission of Eu3+ ions is acquired owing to energy transfer from excitons to dopants. Moreover, the energy transfer is temperature-dependent which originating from the increase of nonradiative transition probability, leading to decrease for the NCs hosts’ PL intensity, but increase for the PL intensity of dopants.
关键词： Eu3+ doped,excitonic luminescence,Cesium lead halide,energy transfer,perovskite nanocrystals
更新于2025-09-10 09:29:36