A unique photofunction of YVO4: Bi3+,Eu3+ nanophosphor: Photoluminescent indication for photochemical decomposition of polyurethane

Hiroki Hara, Satoru Takeshita, Tetsuhiko Isobe, Tomohiro Sawayama, Seiji Niikura

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We have developed a transparent composite film consisting of YVO 4:Bi3+,Eu3+ nanophosphor and polyurethane resin which exhibits unique photophysicochemical behavior. The nanophosphor shows red photoluminescence through f-f transitions of Eu3+ under near-UV irradiation. The emission intensity drops to half of the initial value after continuous irradiation for 23 h. As shown by electron spin resonance spectroscopy, this decrease in the emission intensity is caused by the formation of V4+ defects. In addition, thermal analysis and Fourier transform infrared spectroscopy show that the amount of the organic species in the film decreases from 58 to 25 wt% after 23 h. These results indicate that the nanophosphor promotes photooxidative decomposition of the polyurethane resin, while some of the V5+ ions in YVO4 are converted to V 4+ ions by photoreduction. Prolonged irradiation for 96 h leads to complete decomposition of the polyurethane and the disappearance of the V 4+ defects, resulting in the recovery of the emission intensity. These findings suggest that the photoluminescence of YVO4:Bi 3+,Eu3+ nanophosphor can be used to detect the photooxidative decomposition of polyurethane.

Original languageEnglish
Pages (from-to)311-315
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume178
Issue number5
DOIs
Publication statusPublished - 2013 Mar 20

Fingerprint

Polyurethanes
polyurethane resins
indication
Irradiation
Decomposition
decomposition
irradiation
Photoluminescence
Ions
Electron spin resonance spectroscopy
photoluminescence
Defects
defects
Composite films
photochemical reactions
resins
Thermoanalysis
electron paramagnetic resonance
thermal analysis
ions

Keywords

  • Nanophosphor
  • Photochemical reaction
  • Photoluminescence
  • YVO:Bi,Eu

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

A unique photofunction of YVO4 : Bi3+,Eu3+ nanophosphor: Photoluminescent indication for photochemical decomposition of polyurethane. / Hara, Hiroki; Takeshita, Satoru; Isobe, Tetsuhiko; Sawayama, Tomohiro; Niikura, Seiji.

In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 178, No. 5, 20.03.2013, p. 311-315.

Research output: Contribution to journalArticle

@article{fcbbbb41ffb84279b33e3f037018715e,
title = "A unique photofunction of YVO4: Bi3+,Eu3+ nanophosphor: Photoluminescent indication for photochemical decomposition of polyurethane",
abstract = "We have developed a transparent composite film consisting of YVO 4:Bi3+,Eu3+ nanophosphor and polyurethane resin which exhibits unique photophysicochemical behavior. The nanophosphor shows red photoluminescence through f-f transitions of Eu3+ under near-UV irradiation. The emission intensity drops to half of the initial value after continuous irradiation for 23 h. As shown by electron spin resonance spectroscopy, this decrease in the emission intensity is caused by the formation of V4+ defects. In addition, thermal analysis and Fourier transform infrared spectroscopy show that the amount of the organic species in the film decreases from 58 to 25 wt{\%} after 23 h. These results indicate that the nanophosphor promotes photooxidative decomposition of the polyurethane resin, while some of the V5+ ions in YVO4 are converted to V 4+ ions by photoreduction. Prolonged irradiation for 96 h leads to complete decomposition of the polyurethane and the disappearance of the V 4+ defects, resulting in the recovery of the emission intensity. These findings suggest that the photoluminescence of YVO4:Bi 3+,Eu3+ nanophosphor can be used to detect the photooxidative decomposition of polyurethane.",
keywords = "Nanophosphor, Photochemical reaction, Photoluminescence, YVO:Bi,Eu",
author = "Hiroki Hara and Satoru Takeshita and Tetsuhiko Isobe and Tomohiro Sawayama and Seiji Niikura",
year = "2013",
month = "3",
day = "20",
doi = "10.1016/j.mseb.2012.12.011",
language = "English",
volume = "178",
pages = "311--315",
journal = "Materials Science and Engineering B: Solid-State Materials for Advanced Technology",
issn = "0921-5107",
publisher = "Elsevier BV",
number = "5",

}

TY - JOUR

T1 - A unique photofunction of YVO4

T2 - Bi3+,Eu3+ nanophosphor: Photoluminescent indication for photochemical decomposition of polyurethane

AU - Hara, Hiroki

AU - Takeshita, Satoru

AU - Isobe, Tetsuhiko

AU - Sawayama, Tomohiro

AU - Niikura, Seiji

PY - 2013/3/20

Y1 - 2013/3/20

N2 - We have developed a transparent composite film consisting of YVO 4:Bi3+,Eu3+ nanophosphor and polyurethane resin which exhibits unique photophysicochemical behavior. The nanophosphor shows red photoluminescence through f-f transitions of Eu3+ under near-UV irradiation. The emission intensity drops to half of the initial value after continuous irradiation for 23 h. As shown by electron spin resonance spectroscopy, this decrease in the emission intensity is caused by the formation of V4+ defects. In addition, thermal analysis and Fourier transform infrared spectroscopy show that the amount of the organic species in the film decreases from 58 to 25 wt% after 23 h. These results indicate that the nanophosphor promotes photooxidative decomposition of the polyurethane resin, while some of the V5+ ions in YVO4 are converted to V 4+ ions by photoreduction. Prolonged irradiation for 96 h leads to complete decomposition of the polyurethane and the disappearance of the V 4+ defects, resulting in the recovery of the emission intensity. These findings suggest that the photoluminescence of YVO4:Bi 3+,Eu3+ nanophosphor can be used to detect the photooxidative decomposition of polyurethane.

AB - We have developed a transparent composite film consisting of YVO 4:Bi3+,Eu3+ nanophosphor and polyurethane resin which exhibits unique photophysicochemical behavior. The nanophosphor shows red photoluminescence through f-f transitions of Eu3+ under near-UV irradiation. The emission intensity drops to half of the initial value after continuous irradiation for 23 h. As shown by electron spin resonance spectroscopy, this decrease in the emission intensity is caused by the formation of V4+ defects. In addition, thermal analysis and Fourier transform infrared spectroscopy show that the amount of the organic species in the film decreases from 58 to 25 wt% after 23 h. These results indicate that the nanophosphor promotes photooxidative decomposition of the polyurethane resin, while some of the V5+ ions in YVO4 are converted to V 4+ ions by photoreduction. Prolonged irradiation for 96 h leads to complete decomposition of the polyurethane and the disappearance of the V 4+ defects, resulting in the recovery of the emission intensity. These findings suggest that the photoluminescence of YVO4:Bi 3+,Eu3+ nanophosphor can be used to detect the photooxidative decomposition of polyurethane.

KW - Nanophosphor

KW - Photochemical reaction

KW - Photoluminescence

KW - YVO:Bi,Eu

UR - http://www.scopus.com/inward/record.url?scp=84872842153&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872842153&partnerID=8YFLogxK

U2 - 10.1016/j.mseb.2012.12.011

DO - 10.1016/j.mseb.2012.12.011

M3 - Article

AN - SCOPUS:84872842153

VL - 178

SP - 311

EP - 315

JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

SN - 0921-5107

IS - 5

ER -