Preparation, photoluminescence, and photostability of transparent composite films of glycothermally synthesized YAG: Ce3+ nanoparticles for white LED

Yuta Sasaki, Satoru Takeshita, Tetsuhiko Isobe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The powder of glycothermally synthesized, Ce3+-doped yttrium aluminum garnet (YAG:Ce3+) nanoparticles exhibits decreased green-yellow emission, under continuous blue light excitation. This emission corresponds to the 5d → 4f transition of Ce3+. YAG:Ce3+ nanoparticles were dispersed in polyvinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) matrix films, to improve their photostabilities. The well-dispersed YAG:Ce3+ nanoparticles were confirmed from transmission electron microscopy observations. The emission and excitation spectra of the composite films were comparable to those of the YAG:Ce3+ nanoparticle powder. The photoluminescence (PL) intensity of the YAG:Ce3+/PVP film gradually decreased to 35% of its initial PL intensity, upon exposure to excitation at 450 nm. The PL intensity of the YAG:Ce3+/PVA film recovered to 95%, after initially decreasing to 82%. The differing photostabilities of the two composite films are discussed.

Original languageEnglish
Pages (from-to)R3049-R3054
JournalECS Journal of Solid State Science and Technology
Volume5
Issue number1
DOIs
Publication statusPublished - 2016

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Composite films
Light emitting diodes
Photoluminescence
Nanoparticles
Polyvinyls
Pyrrolidinones
Polyvinyl Alcohol
Polyvinyl alcohols
Powders
Garnets
Yttrium
Transmission electron microscopy
Aluminum

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Preparation, photoluminescence, and photostability of transparent composite films of glycothermally synthesized YAG: Ce3+ nanoparticles for white LED",
abstract = "The powder of glycothermally synthesized, Ce3+-doped yttrium aluminum garnet (YAG:Ce3+) nanoparticles exhibits decreased green-yellow emission, under continuous blue light excitation. This emission corresponds to the 5d → 4f transition of Ce3+. YAG:Ce3+ nanoparticles were dispersed in polyvinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) matrix films, to improve their photostabilities. The well-dispersed YAG:Ce3+ nanoparticles were confirmed from transmission electron microscopy observations. The emission and excitation spectra of the composite films were comparable to those of the YAG:Ce3+ nanoparticle powder. The photoluminescence (PL) intensity of the YAG:Ce3+/PVP film gradually decreased to 35{\%} of its initial PL intensity, upon exposure to excitation at 450 nm. The PL intensity of the YAG:Ce3+/PVA film recovered to 95{\%}, after initially decreasing to 82{\%}. The differing photostabilities of the two composite films are discussed.",
author = "Yuta Sasaki and Satoru Takeshita and Tetsuhiko Isobe",
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TY - JOUR

T1 - Preparation, photoluminescence, and photostability of transparent composite films of glycothermally synthesized YAG

T2 - Ce3+ nanoparticles for white LED

AU - Sasaki, Yuta

AU - Takeshita, Satoru

AU - Isobe, Tetsuhiko

PY - 2016

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N2 - The powder of glycothermally synthesized, Ce3+-doped yttrium aluminum garnet (YAG:Ce3+) nanoparticles exhibits decreased green-yellow emission, under continuous blue light excitation. This emission corresponds to the 5d → 4f transition of Ce3+. YAG:Ce3+ nanoparticles were dispersed in polyvinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) matrix films, to improve their photostabilities. The well-dispersed YAG:Ce3+ nanoparticles were confirmed from transmission electron microscopy observations. The emission and excitation spectra of the composite films were comparable to those of the YAG:Ce3+ nanoparticle powder. The photoluminescence (PL) intensity of the YAG:Ce3+/PVP film gradually decreased to 35% of its initial PL intensity, upon exposure to excitation at 450 nm. The PL intensity of the YAG:Ce3+/PVA film recovered to 95%, after initially decreasing to 82%. The differing photostabilities of the two composite films are discussed.

AB - The powder of glycothermally synthesized, Ce3+-doped yttrium aluminum garnet (YAG:Ce3+) nanoparticles exhibits decreased green-yellow emission, under continuous blue light excitation. This emission corresponds to the 5d → 4f transition of Ce3+. YAG:Ce3+ nanoparticles were dispersed in polyvinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) matrix films, to improve their photostabilities. The well-dispersed YAG:Ce3+ nanoparticles were confirmed from transmission electron microscopy observations. The emission and excitation spectra of the composite films were comparable to those of the YAG:Ce3+ nanoparticle powder. The photoluminescence (PL) intensity of the YAG:Ce3+/PVP film gradually decreased to 35% of its initial PL intensity, upon exposure to excitation at 450 nm. The PL intensity of the YAG:Ce3+/PVA film recovered to 95%, after initially decreasing to 82%. The differing photostabilities of the two composite films are discussed.

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