Fabrication of Y3Al5O12:Eu thin films and powders for field emission display applications

Ravichandran, D.; Roy, Rustum; Chakhovskoi, A.G.; Hunt, Charles E.; White, W.B.; Erdei, S.

doi:10.1016/s0022-2313(96)00137-8

Cited by 157 publications

(73 citation statements)

References 4 publications

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“…These peaks corresponded to an electron transition at 5 D 0 ➝ 7 F 2 and 5 D 0 ➝ 7 F 4 , respectively. In the cubic YAG phase, Y 3+ was coordinated with eight oxygen ions with D 2 point symmetry [4]. Eu 3+ substitutes for Y 3+ and exhibits D 2 point symmetry.…”

Section: -mentioning

confidence: 99%

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Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Lee

Jung

Yoda

et al. 2015

Ceramics International

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Section: -mentioning

confidence: 99%

“…to ensure vitrification [3]. YAG:Eu ceramics, which is YAG doped with Eu 3+ ions, have been investigated with the aim of developing new phosphor materials [4][5][6][7][8][9]. In addition, many studies have focused on the photoluminescence effect of Eu 3+ ions in crystalline YAG powers, not in YAG bulk glass-ceramics.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Lee

Jung

Yoda

et al. 2015

Ceramics International

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“…When properly activated with luminescent centers, the REAG compounds are important inorganic phosphors (such as YAG:Ce), which find applications in cathode ray tubes (CRTs), field emission displays (FEDs), vacuum fluorescent displays, scintillators, electroluminescent materials and so forth [3][4][5][6][7], owing to their high chemical and radiation stabilities, wide bandgap and excellent radiation conversion efficiency. YAG:Tb is a green phosphor used in FEDs [8][9][10][11], while Ce 3+ -activated YAG and LuAG yellow phosphors combined with blue light-emitting diodes (LEDs) are efficient white-light sources [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors

Zhang

et al. 2012

Science and Technology of Advanced Materials

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The metastable garnet lattice of Gd 3 Al 5 O 12 is stabilized by doping with smaller Lu 3+ , which then allows an effective incorporation of larger Eu 3+ activators. The [(Gd 1−x Lu x ) 1−y Eu y ] 3 Al 5 O 12 (x = 0.1-0.5, y = 0.01-0.09) garnet solid solutions, calcined from their precursors synthesized via carbonate coprecipitation, exhibit strong luminescence at 591 nm (the 5 D 0 → 7 F 1 magnetic dipole transition of Eu 3+ ) upon UV excitation into the charge transfer band (CTB) at ∼239 nm, with CIE chromaticity coordinates of x = 0.620 and y = 0.380 (orange-red). The quenching concentration of Eu 3+ was estimated at ∼5 at.% (y = 0.05), and the quenching was attributed to exchange interactions. Partial replacement of Gd 3+ with Lu 3+ up to 50 at.% (x = 0.5) while keeping Eu 3+ at the optimal content of 5 at.% does not significantly alter the peak positions of the CTB and 5 D 0 → 7 F 1 emission bands but slightly weakens both bands owing to the higher electronegativity of Lu 3+ . The effects of processing temperature (1000-1500• C) and Lu/Eu contents on the intensity, quantum efficiency, lifetime and asymmetry factor of luminescence were thoroughly investigated. The [(Gd 0.7 Lu 0.3 ) 0.95 Eu 0.05 ] 3 Al 5 O 12 phosphor processed at 1500• C exhibits a high internal quantum efficiency of ∼83.2% under 239 nm excitation, which, in combination with the high theoretical density, favors its use as a new type of photoluminescent and scintillation material.

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“…Un ejemplo de ello es su aplicación en el campo de la óptica y el tradicional desarrollo de láseres y fósforos en esta estructura (11,12,13,14).…”

Section: Introductionunclassified

Síntesis de nuevos pigmentos cerámicos de color rojo mediante el método de Pechini

Pavlov¹,

Blasco²,

Cordoncillo³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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A través del presente trabajo, se han estudiado la obtención de diferentes disoluciones sólidas en la estructura granate de itrio y aluminio, Y 3 Al 5 O 12 (YAG) sintetizadas vía Pechini y la posibilidad de modificar la intensidad del campo cristalino, D o , que actúa sobre el ion Cr(III), como agente cromóforo, mediante la introducción de cationes divalentes (Mn(II) y Mg(II)) y tetravalentes (Ce(IV), Zr(IV) y Sn(IV)). Los resultados alcanzados han posibilitado comprender que con la introducción de los iones divalentes, éstos no han sido suficientes para intensificar dicho campo del Cr(III), ya que estabilizan al ion Cr(IV) y esto provoca distorsiones estructurales. Con la introducción de los iones tetravalentes, sí que se consigue intensificar el campo que actúa sobre el ion cromóforo, observándose la transición de la tonalidad verde, típica del Cr(III) en un campo débil, a una tonalidad roja, típica para el mismo ion en un campo fuerte. Sin embargo y a través de los estudios estructurales mediante difracción de rayos X, se ha observado que junto con el desarrollo de la estructura granate, disolución sólida, aparecen fases laterales de Y 0,15 Zr 0,85 O 1,93 y Y 2 Sn 2 O 7 , esta última como fase pirocloro. Se ha comprobado la obtención de una tonalidad roja-violácea con la introducción de Cr(III) en dicha estructura pirocloro. Por último, se han probado las fases sintetizadas como pigmentos mediante la utilización de un vidriado (frita) transparente de naturaleza borácica, industrial. Los materiales que contienen estaño en su estructura han mostrado un buen poder pigmentante y estabilidad a 1080ºC. Palabras clave: granates, pigmentos cerámicos, Pechini, síntesis, cristaloquímica. Synthesis of new red coloured ceramic pigments by Pechini methodVarious garnet solid solutions within the structure of the yttrium aluminium garnet, Y 3 Al 5 O 12 (YAG) were sinthesized via Pechini and the possibility for the modification of the crystal field intensity acting on the chromophore Cr(III) ion by means of substitution with divalent (Mn(II) and Mg(II)) and tetravalent (Ce(IV), Zr(IV) and Sn(IV)) cations was studied. The results obtained indicate that the crystal field can not be intensifyed through the introduction of divalent ions since they stabilize the Cr(IV) ion which probably expands the structure by inducing distortions in it. The introduction of tetravalent ions makes possible the intensification of the crystal field acting on the chromium and the change of the typical green colour of Cr(III) in a week field to red which is typical for the same in strong field. However, the structural studies carried out by X-ray diffraction show that together with the garnet fase Y 0,15 Zr 0,85 O 1,93 and Y 2 Sn 2 O 7 are formed, the latter having pyrochlore structure. It was demonstarted that the introduction of Cr(III) in the mantioned pyrochlore structure results in the formation of a redviolet pigment. Finally, the sinthesized fases were checked as pigments using an industrial transparent boron containing frit. The tin containi...

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Fabrication of Y3Al5O12:Eu thin films and powders for field emission display applications

Cited by 157 publications

References 4 publications

Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors

Síntesis de nuevos pigmentos cerámicos de color rojo mediante el método de Pechini

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Fabrication of Y3Al5O12:Eu thin films and powders for field emission display applications

Cited by 157 publications

References 4 publications

Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Microstructure of rapidly quenched YAG-based glass–ceramics prepared by aerodynamic levitation

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu3+doping and development of highly efficient (Gd,Lu)AG:Eu3+red phosphors

Síntesis de nuevos pigmentos cerámicos de color rojo mediante el método de Pechini

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Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors