On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL10O17:Eu

Álvaro Yáñez-González, Berend van Wachem, Stephen Skinner, Frank Beyrau, Andrew Heyes

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Decreased photoluminescence of the phosphor BaMgAL10O17:Eu due to oxidation of the europium dopant at high temperatures has been a subject of study for many years in relation to its use in lighting applications. However, understanding of the underlying effects that cause this reduction in photoluminescence remains incomplete and some of the mechanisms proposed in the literature are contradictory. Recent use of this phosphor as a thermal history sensor has extended the range of exposure conditions normally investigated in lighting applications to higher temperatures and multiple exposure times. The kinetics of the process were investigated by means of spectroscopy and material characterisation techniques. It was found that changes in the luminescence are the result of two simultaneous processes: the oxidation of Eu2+ ions (through a process of diffusion) and a phase transition. The level of degradation of the phosphor is suggested to follow the Kolmogorov-Johnson-Mehl-Avrami (KJMA) model above 900 °C and thus can be predicted with knowledge of the exposure time and temperature. This is useful in applications of the phosphor as a temperature sensor.

LanguageEnglish
Pages145-150
Number of pages6
JournalMaterials and Design
Volume108
Early online date24 Jun 2016
DOIs
Publication statusPublished - 15 Oct 2016

Fingerprint

Phosphors
Oxidation
Kinetics
Photoluminescence
Lighting
Europium
Temperature sensors
Temperature
Luminescence
Phase transitions
Doping (additives)
Spectroscopy
Ions
Degradation
Hot Temperature
Sensors

Keywords

  • BAM:Eu
  • oxidation
  • phosphorescence
  • temperature sensor
  • thermal paint
  • thermographic phosphor
  • optical spectroscopy
  • photoluminescence

Cite this

Yáñez-González, Á., van Wachem, B., Skinner, S., Beyrau, F., & Heyes, A. (2016). On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL10O17:Eu. Materials and Design, 108, 145-150. https://doi.org/10.1016/j.matdes.2016.06.097
Yáñez-González, Álvaro ; van Wachem, Berend ; Skinner, Stephen ; Beyrau, Frank ; Heyes, Andrew. / On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL10O17:Eu. In: Materials and Design. 2016 ; Vol. 108. pp. 145-150.
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Yáñez-González, Á, van Wachem, B, Skinner, S, Beyrau, F & Heyes, A 2016, 'On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL10O17:Eu' Materials and Design, vol. 108, pp. 145-150. https://doi.org/10.1016/j.matdes.2016.06.097

On the kinetics of thermal oxidation of the thermographic phosphor BaMgAL10O17:Eu. / Yáñez-González, Álvaro; van Wachem, Berend; Skinner, Stephen; Beyrau, Frank; Heyes, Andrew.

In: Materials and Design, Vol. 108, 15.10.2016, p. 145-150.

Research output: Contribution to journalArticle

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