Uniform Eu3+-doped YF3 microcrystals: inorganic salt-controlled synthesis and their luminescent properties

Fu, Zuoling; Cui, Xiaoling; Cui, Shaobo; Qi, Xiangdong; Zhou, Shihong; Zhang, Siyuan; Jeong, Jung Hyun

doi:10.1039/c2ce00013j

Cited by 21 publications

(18 citation statements)

References 49 publications

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“…After the addition of Bi 3+ , the growth rate of different crystalline planes is changed because the Bi 3+ ions are selectively absorbed on the surface of the initially formed tiny YF 3 crystals; meanwhile, the existing anions (F − , OH − and NO 3 − ) are coordinated by different coordination strengths and modes. 14 These lead to the change in the grain shape of YF 3 materials. On the other hand, the charge of cations may also be responsible for the size of YF 3 .…”

Section: Resultsmentioning

confidence: 99%

“…For example, Shao et al studied YF 3 :Eu 3+ micro-single crystals, 7 and Fu et al fabricated Eu 3+ -doped YF 3 microcrystals with uniform grains. 14 These studies control the morphology of crystal grains to improve the fluorescence performance of the material by adding different inorganic salts. On the other hand, it has been noted that the energy can be transferred from Bi 3+ to Eu 3+ via a dipole-dipole mechanism in ZnWO 4 : Bi 3+ ,Eu 3+ materials.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these difficulties, it is necessary to develop a simple technology for controlling the micro-topography of crystal particles to enhance the material properties. It has been noted that the morphology of the microscopic particles strongly depends on the concentration of H + ions and inorganic doping, 7,14 because the energy that was applied on the grains is determined by the kinetics of the ions in the reaction system. As a result, changing the concentration of the H + ion may be an effective method to simply regulate the morphology of the grains.…”

Section: Introductionmentioning

confidence: 99%

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Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

et al. 2015

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A simple and facile hydrothermal method has been developed to enhance the fluorescence performance of YF 3 : xEu 3+ , y%Bi 3+ (x = 0-0.2, y = 0-1.5) via optimizing the concentration of Eu 3+ and Bi 3+ and regulating the morphology/phase structure by controlling the amount of HNO 3 . The evolutionary mechanism of the micro-topography and microstructure for the samples has been proposed, and the fluorescence and decay properties of the samples have been investigated. It was found that the fluorescence intensity of the sample has been enhanced greatly after added the opportune amount of Bi 3+ . The optimum concentrations of Eu 3+ and Bi 3+ for fluorescence are x = 0.125 and y = 0.5%, respectively. The significant enhancement in fluorescence performance could be obtained in the sample with the desired morphology at the optimum volume of HNO 3 (VHNO3 = 11 mL). IntroductionIn recent years, lanthanide ions doped inorganic crystals with controllable shapes and sizes have attracted considerable attention because of their potential technological applications in biomedical imaging, anti-fake label and illumination. 1 Among these inorganic materials, fluoride-containing host materials are the most captivating due to their low vibration energy, minimization of the quenching of the correlative excited state of the rare-earth ions and good optical transparency at a wide wavelength region. 2,3 Meanwhile, fluoride-containing materials possess good solubility, adequate thermal and environmental stabilities. These excellent physicochemical properties are in favor of the optical applications of the materials. 4 In comparison with other fluorescent host materials, YF 3 is considered as one of the most important host materials that has been intensively studied in recent years. 5,6 It has been known that trivalent rare earth ions can easily substitute for Y 3+ in the YF 3 because of their similar ionic radii of lanthanide. Moreover, the consummate matrix of YF 3 is conducive to lanthanides doping thus promoting the high efficiency emission of down/up conversion materials without additional charge compensation. 5,7Among rare earth ions, Eu 3+ has been frequently used as an activator due to its intense emission caused by 5 D 0 → 7 F 2 transition in red spectral region. A number of investigations have been carried out to improve the fluorescence efficiency of Eu-containing materials by doping metal ions (e.g. Ln 3+ -doped calcium fluoride nanocrystals, NaxEu 3+ (2−x)/3 MoO 4 , etc.), 4,8,9 employing various synthesis techniques (e.g. a facile arginine-assisted hydrothermal synthesis, electrospinning, etc.) 10,11 and optimizing the stoichiometric ratio of the materials (e.g. Eu 1-x Bi x VO 4 , BaLa 2−x−y ZnO 5 : xBi 3+ ,yEu 3+ , etc.). 12,13 Eu 3+ has also been introduced into YF 3 to obtain laser materials with excellent emission. For example, Shao et al. studied YF 3 : Eu 3+ micro-single crystals, 7 and Fu et al. fabricated Eu 3+ -doped YF 3 microcrystals with uniform grains. 14 These studies control the morphology of crystal grains t...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

et al. 2015

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“…The size (from 400 nm to 4 mm) and morphology was controlled by inorganic salts like AlCl 3 , LiCl, MgCl 2 NaCl, KCl, BaCl 2 etc. 14 More recently, shape controlled Ln 3+ -doped YF 3 mesocrystals have been reported by Yu and his co-workers and effects of reaction time, fluoride sources, solvents on the morphology of mesocrystals were studied. 15 Although most of the reports use a hydrothermal route to make YF 3 nano/microcrystals, the method has some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Tuning the crystalline phase and morphology of the YF3:Eu3+ microcrystals through fluoride source

Sarkar

Mahalingam

2013

CrystEngComm

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“…32,33 YF 3 nano/microstructures with unique morphologies have been synthesized with salt-assisted synthetic methods. For example, Fu et al 34 synthesized truncated octahedral, walnut-like, and bundle-like morphologies of YF 3 by using inorganic salts such as NaCl, LiCl, KCl, and BaCl 2 as the structure-directing agent in the hydrothermal reaction. Qian et al 35 In this paper, we report a salt-controlled synthesis of high-aspect-ratio YF 3 :Yb 3+ /Er 3+ nanocrystals, which showed tunable emission intensity and emission colors from orange to green depending on the aspect ratio and shape.…”

Section: Introductionmentioning

confidence: 99%

Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF₃:Yb³⁺/Er³⁺ Upconversion Nanocrystals

Murali

Mishra

Lee

et al. 2017

Crystal Growth & Design

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We report a facile synthetic method for high-aspect-ratio YF 3 :Yb 3+ /Er 3+ nanocrystals by controlling the composition of the precursor and salts to manipulate the structures of YF 3 :Yb 3+ /Er 3+ nanocrystals. A controlled aspect ratio is attained by tuning the molar ratio of NH 4 + /RE 3+ (NH 4 + is the counter ion released from the fluoride precursor (NH 4 F) andRE 3+ indicate the total amount of Y, Yb, and Er) and the presence of specific inorganic salts. A low molar ratio of NH 4 + /RE 3+ induced the production of high-aspect-ratio YF 3 :Yb 3+ /Er 3+ nanocrystals, while a high molar ratio of NH 4 + /RE 3+ induced the formation of irregular nanoplates. The selection of the inorganic salt as an additive is critical in controlling the aspect ratio and crystallinity of YF 3 :Yb 3+ /Er 3+ nanocrystals. The cation showed limited control over the aspect ratio, but the anions, Cland Br -, induced the production of highest aspect ratio for YF 3 :Yb 3+ /Er 3+ nanocrystals. We found that the aspect ratio affected the luminescence properties of YF 3 :Yb 3+ /Er 3+ nanocrystals. The green emission from nanorod structures changed to orange when the morphology is transformed to nanoplates.medium. The nanocrystals were fabricated from nanorods into nanoplates simply by the adjustment of NH 4 + /RE 3+ mole ratio in the range of 2 to 4.61. Furthermore, the aspect ratio of nanocrystals was well controlled by the addition of inorganic salts. Brand Clanions are favorable to obtain nanocrystals with highest aspect ratio. When the added cation radius increased from Li + to K + , the tendency to produce the nanorod morphology increased.Interestingly, the emission colors of nanocrystals were strongly dependent on the aspect-ratio.Nanorod structures exhibited green emission while nanoplate structures showed orange emission.Given the significant controllability of the morphology and luminescence, our synthesis method may contribute to progressive YF 3 :Yb 3+ /Er 3+ UCNPs synthesis methods. In addition, the bright green and orange color emissions from the prepared YF 3 :Yb 3+ /Er 3+ structures have promising applications in color displays, bioimaging, optical communication, efficient energy harvesting, and photocatalysis.

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Uniform Eu3+-doped YF3 microcrystals: inorganic salt-controlled synthesis and their luminescent properties

Cited by 21 publications

References 49 publications

Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

Tuning the crystalline phase and morphology of the YF3:Eu3+ microcrystals through fluoride source

Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF₃:Yb³⁺/Er³⁺ Upconversion Nanocrystals

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Uniform Eu3+-doped YF3 microcrystals: inorganic salt-controlled synthesis and their luminescent properties

Cited by 21 publications

References 49 publications

Regulated morphology/phase structure and enhanced fluorescence in YF3:Eu3+,Bi3+via a facile method

Regulated morphology/phase structure and enhanced fluorescence in YF3:Eu3+,Bi3+via a facile method

Tuning the crystalline phase and morphology of the YF3:Eu3+ microcrystals through fluoride source

Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF3:Yb3+/Er3+ Upconversion Nanocrystals

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Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

Regulated morphology/phase structure and enhanced fluorescence in YF₃:Eu³⁺,Bi³⁺via a facile method

Aspect-Ratio Controlled Synthesis and Tunable Luminescence of YF₃:Yb³⁺/Er³⁺ Upconversion Nanocrystals