Evaluation of Dy-doped phosphors (YAG: Dy, Al2O3:Dy, and Y2SiO5:Dy) as thermographic phosphors

Naohiro Ishiwada, Eri Fujii, Takeshi Yokomori

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Phosphor thermometry has been viewed as a promising method for non-contact temperature measurement. This article explores the temperature dependence of the Dy-doped phosphors: YAG: Dy, Al2O3:Dy, and Y2SiO5:Dy. The phosphors were energized at 355nm from a 3rd-harmonic-generation Nd:YAG laser. The intensity of YAG:Dy was much stronger than the other phosphors, and the I 458nm /I 497nm intensity ratios had high temperature resolution over a wide range of temperatures. Although Al2O3:Dy and Y2SiO5:Dy had weaker intensity, the temperature resolution of intensity ratios was as substantial as YAG:Dy. The uncertainty in measured temperature of Dy-doped phosphors was evaluated using linearized error propagation theory, based on the noise-to-signal ratio and temperature sensitivity, revealing that the measurement uncertainty of YAG:Dy was less than the other two phosphors, and thus was the most reliable thermographic phosphor. In addition, the optimization of the bandpass filter combination was explored at each temperature range with YAG:Dy phosphor. Consequently, each temperature can be precisely measured by dividing the integrated intensity between 441 and 475nm as a counter peak range and 476-500nm as a main peak range. Thus, ideal bandpass filters are relatively constant throughout all temperatures.

Original languageEnglish
JournalJournal of Luminescence
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Phosphors
yttrium-aluminum garnet
phosphors
Temperature
evaluation
temperature
bandpass filters
Bandpass filters
temperature measurement
Uncertainty
Thermometry
Harmonic generation
Solid-State Lasers
YAG lasers
Signal-To-Noise Ratio
Temperature measurement
harmonic generations
counters
signal to noise ratios
Signal to noise ratio

Keywords

  • Intensity ratio method
  • Non-contact temperature measurement
  • Phosphor thermometry

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

Cite this

Evaluation of Dy-doped phosphors (YAG : Dy, Al2O3:Dy, and Y2SiO5:Dy) as thermographic phosphors. / Ishiwada, Naohiro; Fujii, Eri; Yokomori, Takeshi.

In: Journal of Luminescence, 01.01.2018.

Research output: Contribution to journalArticle

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