Glycothermally synthesized YAG: Ce3+ nanophosphors for blue LEDs

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Abstract

Ce3+-doped yttrium aluminum garnet nanoparticles are prepared from yttrium acetate tetrahydrate, cerium acetate monohydrate, and aluminum isopropoxide by autoclave treatment in 1,4-butanediol at 300°C for 2 h. Optical and structural properties of nanoparticles are characterized as compared to micrometer-sized particles. A transparent film can be produced from the paste of nanoparticles. The back side of the film is excited by blue light and the photoluminescence intensity due to the 5d → 4f transition of Ce 3+ is measured in the front side of the film. The photoluminescence intensity of the film containing nanoparticles is proportional to the film thickness, while that of the film containing micrometer-sized particles reaches a saturated value. This result shows that the transparent film of nanoparticles has markedly low light scattering loss. The gradual decrease in the photoluminescence intensity for nanoparticles is observed under the continuous excitation of blue light. This photobleaching behavior is not observed for micrometer-sized particles. The photobleach is attributed to the photooxidation of Ce3+ to Ce4+ near surface of nanoparticles and can be suppressed for the sealed transparent film containing nanoparticles.

Original languageEnglish
JournalECS Journal of Solid State Science and Technology
Volume2
Issue number2
DOIs
Publication statusPublished - 2013

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Light emitting diodes
Nanoparticles
Photoluminescence
Yttrium
Acetates
Cerium
Aluminum
Photobleaching
Photooxidation
Autoclaves
Garnets
Ointments
Light scattering
Film thickness
Structural properties
Optical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Glycothermally synthesized YAG: Ce3+ nanophosphors for blue LEDs",
abstract = "Ce3+-doped yttrium aluminum garnet nanoparticles are prepared from yttrium acetate tetrahydrate, cerium acetate monohydrate, and aluminum isopropoxide by autoclave treatment in 1,4-butanediol at 300°C for 2 h. Optical and structural properties of nanoparticles are characterized as compared to micrometer-sized particles. A transparent film can be produced from the paste of nanoparticles. The back side of the film is excited by blue light and the photoluminescence intensity due to the 5d → 4f transition of Ce 3+ is measured in the front side of the film. The photoluminescence intensity of the film containing nanoparticles is proportional to the film thickness, while that of the film containing micrometer-sized particles reaches a saturated value. This result shows that the transparent film of nanoparticles has markedly low light scattering loss. The gradual decrease in the photoluminescence intensity for nanoparticles is observed under the continuous excitation of blue light. This photobleaching behavior is not observed for micrometer-sized particles. The photobleach is attributed to the photooxidation of Ce3+ to Ce4+ near surface of nanoparticles and can be suppressed for the sealed transparent film containing nanoparticles.",
author = "Tetsuhiko Isobe",
year = "2013",
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publisher = "Electrochemical Society, Inc.",
number = "2",

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TY - JOUR

T1 - Glycothermally synthesized YAG

T2 - Ce3+ nanophosphors for blue LEDs

AU - Isobe, Tetsuhiko

PY - 2013

Y1 - 2013

N2 - Ce3+-doped yttrium aluminum garnet nanoparticles are prepared from yttrium acetate tetrahydrate, cerium acetate monohydrate, and aluminum isopropoxide by autoclave treatment in 1,4-butanediol at 300°C for 2 h. Optical and structural properties of nanoparticles are characterized as compared to micrometer-sized particles. A transparent film can be produced from the paste of nanoparticles. The back side of the film is excited by blue light and the photoluminescence intensity due to the 5d → 4f transition of Ce 3+ is measured in the front side of the film. The photoluminescence intensity of the film containing nanoparticles is proportional to the film thickness, while that of the film containing micrometer-sized particles reaches a saturated value. This result shows that the transparent film of nanoparticles has markedly low light scattering loss. The gradual decrease in the photoluminescence intensity for nanoparticles is observed under the continuous excitation of blue light. This photobleaching behavior is not observed for micrometer-sized particles. The photobleach is attributed to the photooxidation of Ce3+ to Ce4+ near surface of nanoparticles and can be suppressed for the sealed transparent film containing nanoparticles.

AB - Ce3+-doped yttrium aluminum garnet nanoparticles are prepared from yttrium acetate tetrahydrate, cerium acetate monohydrate, and aluminum isopropoxide by autoclave treatment in 1,4-butanediol at 300°C for 2 h. Optical and structural properties of nanoparticles are characterized as compared to micrometer-sized particles. A transparent film can be produced from the paste of nanoparticles. The back side of the film is excited by blue light and the photoluminescence intensity due to the 5d → 4f transition of Ce 3+ is measured in the front side of the film. The photoluminescence intensity of the film containing nanoparticles is proportional to the film thickness, while that of the film containing micrometer-sized particles reaches a saturated value. This result shows that the transparent film of nanoparticles has markedly low light scattering loss. The gradual decrease in the photoluminescence intensity for nanoparticles is observed under the continuous excitation of blue light. This photobleaching behavior is not observed for micrometer-sized particles. The photobleach is attributed to the photooxidation of Ce3+ to Ce4+ near surface of nanoparticles and can be suppressed for the sealed transparent film containing nanoparticles.

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