Microwave-Induced Combustion Synthesis of Luminescent Aluminate Powders

Potdevin, A.; Pradal, Nathalie; François, Marc; Chadeyron, G.; Boyer, Damien; Mahiou, Rachid

doi:10.5772/34270

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…The phosphors used for simulations are materials whose synthesis processes have been specifically developed in our group [23][24][25][26][27] and which exhibit absorption bands matching well with excitation sources considered in this work. All the selected phosphors were prepared by synthesis routes allowing a control of their morphology with narrow size distribution particles in comparison to those prepared by conventional solid-state reaction.…”

Section: Resultsmentioning

confidence: 99%

Soft-Chemistry Derived Advanced Phosphors for Smart Lighting Devices Based on Blue or UV LEDs

Chadeyron

Pradal

Potdevin

et al. 2012

ECS J. Solid State Sci. Technol.

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This work deals with phosphors suitable for applications in a new generation of Hg-free lamps based on deep ultraviolet (DUV), ultraviolet (UV) and blue light emitting diodes (LEDs). First, two synthesis routes, solid state reaction and Pechini method, have been used for preparing an original red phosphor, Y 3 BO 6 :Eu 3+ . Phase purity was confirmed by XRD analysis for Pechini derived sample after washing the powder with an acidic solution while the synthesis dependence of the morphological and optical characteristics was evidenced by SEM analysis and photoluminescence respectively. Y 3 BO 6 :Eu 3+ powders derived from Pechini process exhibited high photoluminescence quantum efficiency upon excitation at wavelengths corresponding to afore mentioned sources, in comparison with commercial Y 2 O 3 :Eu 3+ red phosphor. Furthermore, the Pechini method was used for elaborating Y 3 BO 6 :Eu 3+ spray-coated thin film. Its structural and optical features were also investigated. Finally, colorimetric simulations have pointed out that Y 3 BO 6 :Eu 3+ could be efficiently combined with blue and green phosphors to produce white light from DUV LEDs. Regarding blue LEDs sources, a mixture constituted of Y 3 Al 5 O 12 :Ce 3+ and Y 3 Al 5 O 12 :Pr 3+ powders has been investigated and resulted in promising results for providing white light with suitable features for indoor or outdoor lighting.

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Section: Resultsmentioning

confidence: 99%

Soft-Chemistry Derived Advanced Phosphors for Smart Lighting Devices Based on Blue or UV LEDs

Chadeyron

Pradal

Potdevin

et al. 2012

ECS J. Solid State Sci. Technol.

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“…Within minutes, flames and combustions were observed due to the dehydration and decomposition of nitrates and urea. Large amount of gases was liberated during the process [14]. The as microwaved powder was then taken out and crushed into fine powders using a mortar and pestle to ensure homogeneity of the mixture.…”

Section: Synthesis Methodsmentioning

confidence: 99%

Synthesis and Characterization of YAG:Ce Phosphor by Microwave Induced Combustion Synthesis with Different Fuel Sources

Lau

Hassan

Lim

et al. 2020

SSP

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White LEDs (WLEDs) have been produced from the combination of blue LED chips and phosphor converter. In the present work, considerable amount of yttrium aluminium garnet (YAG) phosphor powders doped with 0.3 mol% of cerium (Ce) have been synthesized via Microwave Induced Combustion Synthesis (MICS) method with different fuel sources such as urea and mixed fuel of urea and glycine. The effects of different fuel sources on the crystallinity, structure, luminescent properties and Commision International de L’Eclairage (CIE) chromaticity was characterized and studied using high resolution X-ray diffraction (HR XRD), field emission-scanning electron microscopy (FE SEM), energy dispersive X-ray spectroscopy (EDX), electroluminescence (EL) and standard CIE 1931 chromaticity diagram, respectively. The highest EL intensity can be observed from the sample prepared by mixed fuel technique. In contrast, the experimental enhancement in the aforementioned properties was demonstrated by the WLED synthesized using mixed fuel technique. Keywords: White LEDs, phosphor converter, microwave induced combustion, mixed fuel technique.

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“…By using an autoclave for precipitate producer (in hydrothermal condi− tions) solvothermal (co)precipitation method can be sped up. Some possible reactions, which may be involved in the (co)precipitation process for YAG:Ce and YAG:Ce, Re synthesis are presented below [23,36,39,[42][43][44] It is important to keep a constant pH value, which can be done by adding the precipitation agent in excess or by con− trolling the dropwise time of the raw material solution over the precipitant solution. The variation in pH and the concen− tration of [NH 4 + ] and [CO 3 2-] influence the final product.…”

Section: Solid-state Reaction Methods For Phosphor Synthesismentioning

confidence: 99%

“…YAG:Ce and YAG:Ce, Re phosphor showed high photoluminescence quantum yield efficiency (QY) of above 35-70% upon 450-470 nm excitation. The solid state is used to manufac− ture the commercial YAG:Ce powder (Phosphor Tech) with the best QY (about 90%) [43].…”

Section: Fluorescence (Pl) Spectroscopymentioning

confidence: 99%

Synthesis and characterization of YAG:Ce phosphors for white LEDs

Ţucureanu

Matei

Avram

2015

Opto-Electronics Review

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Worldwide commercial interest in the production of cerium doped yttrium aluminium garnet (YAG:Ce) phosphors is reflected in the widespread use of white light emitting devices. Despite of the fact that YAG:Ce is considered a “cool phosphor” it is the most important in white LED technology. This article reviews the developed techniques for producing phosphors with superior photoluminescence efficiency, including solid-state reaction, sol-gel and (co)precipitation methods. Also, by co-doping with rare earth elements, a red/blue shift is reached in the spectrum. The characteristics of YAG:Ce phosphors are investigated because the properties of the phosphors are strongly influenced by the synthesis routes and the sintering temperature treatment. After the phase analysis, morphology and emission studies of the phosphors there may be seen the conditions when the transition from the amorphous phase to the crystalline phase appears, when luminescent properties are influenced by the crystalline form, purity, average size of the particles, co-doping and so on.

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Microwave-Induced Combustion Synthesis of Luminescent Aluminate Powders

Cited by 5 publications

References 32 publications

Soft-Chemistry Derived Advanced Phosphors for Smart Lighting Devices Based on Blue or UV LEDs

Soft-Chemistry Derived Advanced Phosphors for Smart Lighting Devices Based on Blue or UV LEDs

Synthesis and Characterization of YAG:Ce Phosphor by Microwave Induced Combustion Synthesis with Different Fuel Sources

Synthesis and characterization of YAG:Ce phosphors for white LEDs

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