Precision evaluation of phosphors for the lifetime method in phosphor thermometry

Kazuki Tsuchiya, Kento Sako, Naohiro Ishiwada, Takeshi Yokomori

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The precision of the lifetime method in phosphor thermometry was examined in terms of the uncertainty in temperature prediction. Such uncertainty can be estimated using the rate of change in lifetime with temperature (lifetime sensitivity) and the uncertainty in measured lifetime. This uncertainty depends on phosphorescence characteristics such as phosphorescence intensity and lifetime decay shape. In this study, we proposed a method of calculating uncertainties in measured lifetimes by the estimated regression coefficients in measured decay signals of phosphors. To demonstrate this evaluation, the uncertainties in the predicted temperatures of some common phosphors (MFG, GGG:Cr, Y2O3:Eu) were calculated. Consequently, the temperature predictions by the lifetime method with MFG, GGG:Cr, and Y2O3:Eu showed high precision at about 800 K, 700 K, and 900 K, respectively. This method of evaluating precision by using both lifetime sensitivity and uncertainty in lifetime helps to improve the appropriate use of phosphors for the lifetime method in phosphor thermometry.

Original languageEnglish
Article number065005
JournalMeasurement Science and Technology
Issue number6
Publication statusPublished - 2020 Jun


  • lifetime method
  • noncontact temperature measurement
  • phosphor thermometry
  • thermographic phosphor

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics


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