Color tuning of Y3Al5O12:Ce phosphor and their blend for white LEDs

Kottaisamy, M.; Thiyagarajan, P.; Mishra, Jayanta Kumar; Rao, M. S. Ramachandra

doi:10.1016/j.materresbull.2007.09.005

Cited by 130 publications

(55 citation statements)

References 14 publications

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“…For example, CeF 3 and Ce 3þ -doped oxides, such as Y 3 Al 5 O 12 garnet (YAG), are utilized for scintillating and/or white light generating applications because of their characteristic emission properties. [1][2][3][4][5] Ce 2 Zr 2 O 7{8 ordered phases, which have efficient oxygen desorption/absorption properties, are used as catalytic promoters for reactions cleaning automotive exhaust gases. 6) These materials properties are closely related to the configurations of Ce4 f -based states.…”

Section: Introductionmentioning

confidence: 99%

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

2009

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We investigated the local atomic and electronic structure around Ce in CeF 3 and Ce 2 O 3 by the combination analysis of F-and O-K shell electron energy loss near edge structures (ELNES) and first-principles calculations. The energy width of the main edge structure depended on the interaction between Ce5d orbitals and the neighboring F/O atoms. Not only ELNES but also the reported emission and excitation spectra were qualitatively consistent with the electronic structures of density functional theory (DFT) calculations with Hubbard U for the Ce4 f energy correction. Main factors determining the emission wavelength of the fluoride and Ce-doped oxides were discussed.

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Section: Introductionmentioning

confidence: 99%

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

2009

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“…The white light is generated by a combination of the non-absorbed blue emission from the blue LED and the broad yellow emission from Ce:YAG phosphor [2]. However, it inherently suffers from a low colour-rendering index due to the red spectral deficiency [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Armetta¹,

Sibeko

Luyt

et al. 2016

Zeitschrift Für Physikalische Chemie

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Ce:YAG-poly(methyl methacrylate) (PMMA) composites were prepared by using a melt compounding method, adding several amounts of Ce:YAG in the range 0.1-5 wt. %. The optical properties of the obtained composites and of the composites combined with a blue LED were measured to investigate the effect of the amount of Ce:YAG on the resulting emitted light in view of possible application in white LED manufacture. An increase in Ce:YAG amount caused an increase in the emission and a shift of 15 nm, influencing the white LED performance. The structure and morphology of the composites were studied. The results show that the interaction between the two components, observed by using solid state NMR experiments, are the responsible for the observed shift.

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“…12 The second approach to synthesizing nano-sized YAG particles is the bottom-up method, which is a wet-chemical method that utilizes reactions in solution. Since solution-based syntheses can yield better homogeneity, [13][14][15] there have been several investigations regarding the wet-chemical synthesis of nano-sized YAG phosphors that employed sol-gel, 13,[16][17][18] co-precipitation, [19][20][21] homogeneous precipitation, 22 spray pyrolysis, 23,24 hydrothermal reaction, 25 and combustion methods. 14 Although several researchers have previously produced nano-sized YAG phosphors by the simple co-precipitation method, their syntheses often required special equipment such as an autoclave to form the nanoparticles at high temperatures and pressures.…”

Section: Introductionmentioning

confidence: 99%

Template-free Synthesis and Characterization of Spherical Y₃Al₅O₁₂:Ce³⁺(YAG:Ce) Nanoparticles

Kim¹,

Lee²

2014

Bulletin of the Korean Chemical Society

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Cerium-activated yttrium aluminate (Y 3 Al 5 O 12 :Ce 3+ ) exhibiting a garnet structure has been widely utilized in the production of light emitting diodes (LEDs) as a yellow emitting phosphor. The commercialized yttrium aluminum garnet (YAG) phosphor is typically synthesized by a solid-state reaction, which produces irregular shape particles with a size of several tens of micrometers by using the top-down method. To control the shape and size of particles, which had been the primary disadvantage of top-down synthetic methods, we synthesized YAG:Ce nanoparticles with a diameter of 500 nm using a coprecipitation method under the atmospheric pressure without the use of template or special equipment. The precursor particles were formed by refluxing an aqueous solution of the nitrate salts of Y, Al, and Ce, urea, and polyvinylpyrrolidone (55 K) at 100 °C for 12 h. YAG:Ce nanoparticles were formed by the calcination of precursor particles at 1100 °C for 10 h under atmospheric conditions. The phase identification, microstructure, and photoluminescent properties of the products were evaluated by X-ray powder diffraction, scanning electron microscopy, absorption spectrum and photoluminescence analyses.

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Color tuning of Y3Al5O12:Ce phosphor and their blend for white LEDs

Cited by 130 publications

References 14 publications

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Template-free Synthesis and Characterization of Spherical Y₃Al₅O₁₂:Ce³⁺(YAG:Ce) Nanoparticles

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Color tuning of Y3Al5O12:Ce phosphor and their blend for white LEDs

Cited by 130 publications

References 14 publications

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

Local Electronic and Atomic Structure of Ce<SUP>3+</SUP>-Containing Fluoride/Oxide Determined by TEM-EELS and First-Principles Calculations

Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED

Template-free Synthesis and Characterization of Spherical Y3Al5O12:Ce3+(YAG:Ce) Nanoparticles

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Template-free Synthesis and Characterization of Spherical Y₃Al₅O₁₂:Ce³⁺(YAG:Ce) Nanoparticles