Synthesis and sol–gel assembly of nanophosphors

Boilot, Jean‐Pierre; Gacoin, Thierry; Perruchas, Sandrine

doi:10.1016/j.crci.2009.03.008

Cited by 17 publications

(12 citation statements)

References 89 publications

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“…18 Moreover, the quantum yield values of the NPs experience a significant reduction relative to those of the corresponding bulk materials (e.g. 0.20 for YVO 4 : Eu 15 and 0.003 for NaYF 4 : Er,Yb 19 NPs, instead of 0.70-0.90 and 0.03 for the respective bulks). This reduction is ascribed to surface quenching effects (e.g.…”

Section: Hybrids As Phosphorsmentioning

confidence: 99%

“…[2][3][4] Here we will emphasise some illustrative examples in which the hybrid host belongs to one of the following classes: amineand amide-functionalized matrices; 5,6 organosilicas; 7,8 mesostructured materials; 9,10 ionogels; 11,12 and liganddecorated nanoparticles (NPs). [13][14][15] Besides the intra-4f lines, the emission spectra of Ln 3+ -based amine-and amide-functionalized organic-inorganic hybrids display a broad emission in the blue-green spectral region (380-550 nm) ascribed to the hybrid host. This large broad band, already observed in the nondoped matrices, results from a convolution of the emission originated in the cross-linkages between the organic and inorganic counter parts with electron-hole recombinations occurring in the siloxane nanoclusters.…”

Section: Hybrids As Phosphorsmentioning

confidence: 99%

“…12 Embedding Ln 3+ ions in hybrid NPs, rather than incorporating Ln 3+ organic complexes into organicinorganic hybrid hosts, as in the above examples, makes an attractive alternative for developing pure colour (e.g. YVO 4 : Eu, LaPO 4 : Ce and LaPO 4 : Ce,Tb, 15 Fig . 5) and white light efficient phosphors, namely for biomedical applications.…”

Section: Hybrids As Phosphorsmentioning

confidence: 99%

“…Functionalized inorganic Ln 3+ -based NPs have been intensively investigated in the past decade, with most of the work focused on surface modification (readers interested in detailed descriptions can find specific reviews in ref. [13][14][15]. Generally, the surface of the nanocrystals is covered by hydrophobic capping ligands (such as oleic acid, OA), which are not suitable for many biomedical and biological applications.…”

Section: Hybrids As Phosphorsmentioning

confidence: 99%

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Progress on lanthanide-based organic–inorganic hybrid phosphors

et al. 2011

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Research on organic-inorganic hybrid materials containing trivalent lanthanide ions (Ln 3+ ) is a very active field that has rapidly shifted in the last couple of years to the development of eco-friendly, versatile and multifunctional systems, stimulated by the challenging requirements of technological applications spanning domains as diverse as optics, environment, energy, and biomedicine. This tutorial review offers a general overview of the myriad of advanced Ln 3+ -based organic-inorganic hybrid materials recently synthesised, which may be viewed as a major innovation in areas of phosphors, lighting, integrated optics and optical telecommunications, solar cells, and biomedicine.

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Section: Hybrids As Phosphorsmentioning

confidence: 99%

Section: Hybrids As Phosphorsmentioning

confidence: 99%

Section: Hybrids As Phosphorsmentioning

confidence: 99%

Section: Hybrids As Phosphorsmentioning

confidence: 99%

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Progress on lanthanide-based organic–inorganic hybrid phosphors

et al. 2011

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“…[1][2][3][4] Because inorganic nanophosphors do not show any scattering effect in the visible region, transparent luminescent matrices can be fabricated by embedding inorganic nanophosphors on transparent matrices, such as glass and plastics. [5][6][7][8] However, nanophosphors agglomerate easily.…”

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confidence: 99%

Preparation of Transparent Red-Emitting YVO₄:Eu Nanophosphor Suspensions

Cho¹,

Huh²

2011

Bulletin of the Korean Chemical Society

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Inorganic nanophosphors are in high demand for advanced flexible and transparent display devices. [1][2][3][4] Because inorganic nanophosphors do not show any scattering effect in the visible region, transparent luminescent matrices can be fabricated by embedding inorganic nanophosphors on transparent matrices, such as glass and plastics.5-8 However, nanophosphors agglomerate easily. Accordingly, the preparation of monodispersed inorganic nanophosphors is essential for the formation of transparent suspensions.YVO4:Eu is a well-known bright red-emitting phosphor that is used in cathode ray tubes (CRTs) and fluorescent lamps. 9,10Normally, micron-sized YVO 4 :Eu phosphors are prepared by solid state reactions.11-13 Nano-sized YVO4:Eu phosphors have been prepared by sonochemical methods, hydrothermal reactions and polymer complex processing methods.14-19 YVO 4 : Eu thin films have been prepared through various techniques such as pulsed laser deposition (PLD), chemical vapor deposition (CVD), and electrochemical method. [20][21][22] In general, these techniques need expensive and complicated equipment set-ups, and complicated processing. Colloidal YVO 4 :Eu phosphors can be synthesized and stabilized by sodium hexametaphosphate. 23,24The preparation of colloids makes possible an alternative approach to fabrication of YVO 4 :Eu thin films by dispersion of colloidal YVO 4 :Eu phosphors in polymer matrix. 25 However, there are few reports on the preparation of YVO4:Eu nanophosphors for transparent suspensions. This paper reports a simple synthetic method for YVO 4 :Eu nanophosphors and its transparent suspensions. A simple and room temperature processing method for fabrication of the transparent and flexible YVO4:Eu thin film is also reported. Figure 1 shows the powder X-ray diffraction (XRD) patterns of the as-prepared YVO 4 :Eu nanophosphors. A series of Bragg reflections in the XRD pattern can be indexed perfectly as tetragonal YVO 4 (JCPDS 17-0341, a = 0.7119 nm, c = 0.6289 nm). Since the mole fraction of europium to yttrium is only 0.05, the europium ion is expected to occupy the yttrium sites in YVO4. Moreover, the ionic radius of Eu 3+ (0.095 nm) is slightly larger than that of Y 3+ (0.089 nm), allowing easy insertion into the yttrium site in YVO4. 26 No other peaks were observed in the XRD pattern, indicating that YVO 4 :Eu had been successfully synthesized.

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