Facile synthesis of YAG:Ce3+ thick films for phosphor converted white light emitting diodes

Zhao, Yunyun; Xu, Huarui; Zhang, Xiuyun; Zhu, Guisheng; Yan, Dongliang; Yu, Aibing

doi:10.1016/j.jeurceramsoc.2015.05.017

Cited by 56 publications

(17 citation statements)

References 19 publications

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“…Ce 3+ ‐activated yttrium aluminum garnet (Y 3 Al 5 O 12 , YAG) is a well‐known commercial yellow phosphor powder widely used in white light‐emitting diodes (LEDs). The yellow YAG:Ce combined with a blue LED or the bule/red/green phosphors combined with an ultraviolet LED both yield energy‐efficient white light . Along with the advances in particle synthesis and sintering technique, sinterable powders with an isotropic cubic structure can be densified into fully transparent bodies for potential applications in various optical and mechanical systems …”

Section: Introductionmentioning

confidence: 99%

“…9,10 As the relationship among absorption coefficient (η abs ), theoretical density (ρ), and effective atomic number (Z eff ) can be expressed as: η abs = ρZ eff 4 , an effective scintillator should have a high density and a large effective atomic number. 11 Even though a transparent YAG:Ce ceramic nearly possesses all of the above properties, X-ray absorption is generally low because of the relatively low ρ of 4.56 g/cm 3 and the small Z eff of 32.6. 12 As a member of garnet family, green-light-emitting lutetium aluminum garnet (Lu 3 Al 5 O 12 :Ce, LuAG:Ce) has a high ρ of 6.67 g/cm 3 and a large Z eff of 63 with a fast response and a high luminescence efficiency.…”

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confidence: 99%

“…11 Even though a transparent YAG:Ce ceramic nearly possesses all of the above properties, X-ray absorption is generally low because of the relatively low ρ of 4.56 g/cm 3 and the small Z eff of 32.6. 12 As a member of garnet family, green-light-emitting lutetium aluminum garnet (Lu 3 Al 5 O 12 :Ce, LuAG:Ce) has a high ρ of 6.67 g/cm 3 and a large Z eff of 63 with a fast response and a high luminescence efficiency. It is therefore a candidate for scintillation material.…”

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confidence: 99%

“…Our interest in gadolinium aluminum garnet (Gd 3 Al 5 O 12 , GAG) matrix material is based on the following elements: (a) gadolinium compounds for GAG production are cost-effective, similarly to YAG, and are significantly cheaper than LuAG, which provides an essential condition for large-scale industrialization; (b) GAG has a higher theoretical density of ρ = ~5.97 g/cm 3 and a higher atomic number of N = 64 for Gd than YAG (ρ = ~4.55 g/cm 3 and N = 39 for Y), which makes it more suitable for scintillation applications; (c) Gd 3+ has been extensively studied and was proven an effective sensitizer to enhance the photoluminescence (PL) intensity of rare-earth cations activated in garnet and oxide matrixes due to its low electronegativity (1.21). 16,17 In the rare-earth aluminate garnet (Ln 3 Al 5 O 12 , LnAG) family that has 160-atom body centered cubic (bcc) unit cell with space group of Ia3d, the thermodynamic stability depends heavily on the ionic radius of Ln 3+ .…”

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confidence: 99%

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Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

2019

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We first report the novel Ce3+‐activated and Lu3+‐stabilized gadolinium aluminate garnet (GAG) transparent ceramics derived from their precipitation precursors via a facile co‐precipitation strategy using ammonium hydrogen carbonate (AHC) as the precipitant. The resulting precursors in liquid phase were substantially homogeneous solid solutions and could directly convert into sinterable garnet powders via pyrolysis. Substituting 35 at.% of Lu3+ for Gd3+ was effective to stabilize the cubic GAG garnet structure and transparent (Gd,Lu)3Al5O12:Ce ceramics were successfully fabricated by vacuum sintering at 1715°C. The ceramic transparency was improved by optimizing the particle processing conditions and the best sample had an in‐line transmittance of ~70% at 580 nm (Ce3+ emission center) and over 80% in partial infrared region with a fine average grain size of ~4.5 μm. Transparent (Gd,Lu)3Al5O12:Ce ceramics have a short critical wavelength (<200 nm) and a maximal infrared cut‐off at ~6.6 μm. Both the (Gd,Lu)3Al5O12:Ce phosphor powder and the transparent ceramic exhibited characteristic yellow emission of Ce3+ with strong broad emission bands from 490 to 750 nm upon UV excitation into two groups of broad bands around 340 and 470 nm. The photoluminescence and photoluminescence excitation intensities as well as the quantum yield were greatly enhanced via high‐temperature densification. Both the phosphor powder and ceramic bulk had short effective fluorescence lifetimes.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

2019

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“…Sol-gel encompasses hydrolysis and condensation of metal alkoxides or semi-metallic precursors under mild conditions, to generate a polymer network. [13][14][15][16][17][18][19] Alkoxides can form homogeneous sols in various solvents and in the presence of other alkoxides or metal derivatives, to produce homogeneous materials at the molecular level. The sol-gel process uses silicon alkoxides Si(OR) n , where R is an organic group (-CH 3 , -C 2 H 5 , etc.).…”

mentioning

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Calcium Phosphate Coatings by Sol-Gel on Acrylonitrile-butadiene-styrene Substrate

Bandeira¹,

Campos²,

Ciuffi³

et al. 2016

J. Braz. Chem. Soc.

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Additive manufacture is an effective technology to produce complex macrostructures from polymers. Sol-gel is a chemical process that affords multifunctional materials by functionalization of different substrates. This work reports on the use of acrylonitrile-butadiene-styrene polymer (ABS) as starting material to obtain a substrate by additive manufacture. Coating of ABS by the sol-gel methodology generated a multifunctional material. Sols with and without phosphate ions were prepared from silicon and calcium alkoxide. Based on X-ray diffraction patterns, a calcium phosphate crystalline structure emerged on ABS after contact of the substrate with simulated body fluid. Infrared analysis revealed that the peaks of the functionalized substrate shifted, indicating that ABS interacted with the sol-gel coating. According to thermal analysis, the maximum decomposition temperature of the coated samples was 20 °C higher as compared to non-coated ABS. Sol-gel and additive manufacture are important technologies to produce materials with applications in biological medium. Keywords: dip-coating, sol-gel, biomaterials IntroductionAdditive manufacture (AM, also known as rapid prototyping) assembles materials in the powder, filament, liquid, or slide form. The materials consist of successively stacked thin layers, resulting in a three-dimensional structure.AM uses computer-aided design (CAD) software to build a mould for the scaffold. The mould displays a branching network of shafts that will define the microchannels in the scaffold.1-5 The fusion deposition model (FDM) technique helps to structure the acrylonitrilebutadiene-styrene polymer (ABS), a mobile extruder head deposits layers of molten material. The layer-by-layer building approach produces highly complex structures that would be impossible to achieve with technologies based on material subtraction, the most frequently employed procedure nowadays. AM has important applications in several areas, including the aircraft and automobile industries, telecommunications, and medicine. [6][7][8] The sol-gel route is a chemical process that involves formation of a sol, namely a colloidal suspension of particles or molecules with liquid character and measuring between 1 and 1000 nm. The sol later goes through a gel phase, which consists of a colloidal system with solid character. In the gel phase, the molecules form a dispersed, continuous, branched, and interpenetrated structure in a system that is usually liquid. After solvent evaporation, the gel phase becomes a solid material that can be either a xerogel, if the solvent is removed by simple evaporation, or an aerogel, if the solvent is removed above its critical temperature and pressure. 9-12The sol-gel process is widely employed to prepare glasses and oxides and to modify surfaces. Sol-gel encompasses hydrolysis and condensation of metal alkoxides or semi-metallic precursors under mild conditions, to generate a polymer network. [13][14][15][16][17][18][19] Alkoxides can form homogeneous sols in various solvents and in the p...

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Recycled Glass and Ce‐Doped‐Y₃Al₅O₁₂ Nanoparticles Phosphor‐in‐Glass for White Light‐Emitting Diodes Applications

Salazar-Valenzuela

Alvarado-Rivera

González

et al. 2020

Physica Status Solidi (a)

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A series of nanocomposites of recycled soda‐lime glass from a glass container and Y3Al5O12:Ce3+ (YAG:Ce) phosphor nanoparticles are fabricated by the two‐step low‐temperature co‐sintering technology. A transparent glass bottle from a commercial beverage is used as glass frit source and mixed with YAG:Ce nanoparticles. Afterward, the powders are pressed to obtain pellets with phosphor concentrations in the range of 2.5–15 wt%. The pellets are sintered at 800 and 900 °C. X‐ray diffraction (XRD) analysis shows that YAG:Ce nanoparticles are conserved even after sintering at 900 °C. The XRD analysis shows that YAG:Ce nanoparticles are conserved even after sintering at 900 °C. The emission spectra of the Ce3+ ions of yttrium aluminum garnet (YAG) nanoparticles combined with the transmitted blue light exhibit color tuning related to the phosphor concentration and the sintering temperature. A tonality shift from cold‐white light toward yellowish‐green region is observed according to the estimated CIE 1931 chromaticity. Thus, recycled glass from a commercial glass container and YAG:Ce nanoparticles phosphor‐in‐glass (PiG) can be an eco‐friendly and low‐cost alternative as color converters.

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Facile synthesis of YAG:Ce3+ thick films for phosphor converted white light emitting diodes

Cited by 56 publications

References 19 publications

Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

Calcium Phosphate Coatings by Sol-Gel on Acrylonitrile-butadiene-styrene Substrate

Recycled Glass and Ce‐Doped‐Y₃Al₅O₁₂ Nanoparticles Phosphor‐in‐Glass for White Light‐Emitting Diodes Applications

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Facile synthesis of YAG:Ce3+ thick films for phosphor converted white light emitting diodes

Cited by 56 publications

References 19 publications

Production and optical properties of Ce3+‐activated and Lu3+‐stabilized transparent gadolinium aluminate garnet ceramics

Production and optical properties of Ce3+‐activated and Lu3+‐stabilized transparent gadolinium aluminate garnet ceramics

Calcium Phosphate Coatings by Sol-Gel on Acrylonitrile-butadiene-styrene Substrate

Recycled Glass and Ce‐Doped‐Y3Al5O12 Nanoparticles Phosphor‐in‐Glass for White Light‐Emitting Diodes Applications

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Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

Production and optical properties of Ce³⁺‐activated and Lu³⁺‐stabilized transparent gadolinium aluminate garnet ceramics

Recycled Glass and Ce‐Doped‐Y₃Al₅O₁₂ Nanoparticles Phosphor‐in‐Glass for White Light‐Emitting Diodes Applications