Synthesis and characterization of Ce:YAG nano-phosphors and ceramics

Selim, F. A.; Khamehchi, A.; Winarski, David; Agarwal, Sahil

doi:10.1364/ome.6.003704

Cited by 35 publications

(10 citation statements)

References 47 publications

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“…The intensity of diffraction peaks of SiO 2 @YAG:Ce sample slightly increases with increase in the calcination time, inferring that the degree of crystallinity has increased. Meanwhile, this also indicates that mean crystallite size increases with increase in annealing temperature [30,31]. The same is expected when the annealing temperature is increased.…”

Section: Analyses Of Synthesized Phosphor Particlessupporting

confidence: 67%

“…SiO 2 @YAG:Ce nanoparticles doped with 0.25, 0.5, 1, and 2 atomic weight % Ce were prepared by the sol-gel method [29][30][31][32]. Pure Y(NO 3 ) 3 •6H 2 O (Sigma-Aldrich, St. Louis, MO, USA), Al(NO 3 ) 3 •9H 2 O (Sigma-Aldrich, St. Louis, MO, USA), and Ce(NO 3 ) 3 •6H 2 O (Sigma-Aldrich, St. Louis, MO, USA) were used as the cations' sources.…”

Section: Synthesis Of Core-shell Sio 2 @Yag:ce Nanoparticlesmentioning

confidence: 99%

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Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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Section: Analyses Of Synthesized Phosphor Particlessupporting

confidence: 67%

Section: Synthesis Of Core-shell Sio 2 @Yag:ce Nanoparticlesmentioning

confidence: 99%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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“…In many phosphors, dopants are distributed among the crystal matrix in a random fashion to create activation sites. The crystal is then broken into smaller pieces to create a powder via mechanical milling [22], [23]. There is no clear control to maximize the spacing between the emissive points and the defect filled surface.…”

Section: -1 / D Estradamentioning

confidence: 99%

32‐1: On‐chip Red Quantum Dots in White LEDs for General Illumination

Estrada¹,

Shimizu²,

Böhmer³

et al. 2018

Symp Digest of Tech Papers

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We report on white LEDs for the general illumination market with red colloidal quantum dots (QDs) applied in an on-chip configuration. Red QDs, in combination with conventional phosphors, lead to LED conversion efficiency improvements that close the gap between 80 and 90 color rendering indexes (CRI) down to within 6% efficacy on a normalized Lm/W basis. We report on QDs colorcloud distribution compared to commercial phosphors in a large scale LED production and on a 7% performance gain from QDs in a chip on board (COB)LED device architecture.

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“…require a post-synthesis heat-treatment to induce YAG crystallization and obtain pure YAG phase. 16,17 However, it also induces particle sintering, leading to micrometer-sized particles, which cannot be easily welldispersed in a medium.…”

Section: Introductionmentioning

confidence: 99%

A new solvothermal method for the synthesis of size-controlled YAG:Ce single-nanocrystals

et al. 2018

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Ce 3+ -doped Y 3 Al 5 O 12 (YAG:Ce) nanocrystals were synthesized by a unique solvothermal method, under sub-critical conditions. A home-made autoclave was used, operating in a larger pressure and temperature range than that with conventional commercial equipment and allowing direct in situ photoluminescence (PL) and X-ray absorption characterizations. The study of various synthesis conditions (pressure, temperature, precursor concentration, reaction time) allowed the best reaction conditions to be pinpointed to control YAG:Ce nanocrystal size, as well as crystal quality, and to get efficient optical properties. Without any post thermal treatment, we succeeded in obtaining wellcrystallized YAG:Ce nanocrystals (30-200 nm), displaying typical PL properties of YAG:Ce with a maximal emission at 550 nm. The pristine 100 nm-sized YAG:Ce nanoparticles present an internal quantum yield of about 40 AE 5%. In situ X-ray absorption near edge spectroscopy demonstrates the presence of Ce 4+ in nanocrystals elaborated at high temperature, resulting from the oxidation of Ce 3+ during the crystallization process. † Electronic supplementary information (ESI) available: Additional TEM images and nanocrystal size distribution histograms (.pdf le). A movie for the in situ visualization upon YAG nanocrystal synthesis (.mpeg le). SeeFig. 3 TEM images of YAG:Ce nanocrystals synthesized at different pressure with T ¼ 350 C, [Al] ¼ 0.09 mol L À1 and reaction time ¼ 150 min. Some individual nanocrystals are circled with yellow solid lines. An aggregate is circled with a white dashed line.This journal is

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Synthesis and characterization of Ce:YAG nano-phosphors and ceramics

Cited by 35 publications

References 47 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

32‐1: On‐chip Red Quantum Dots in White LEDs for General Illumination

A new solvothermal method for the synthesis of size-controlled YAG:Ce single-nanocrystals

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