Optical properties and scattering distribution of thermographic phosphors

Wanxia Zhao, Jan Marti, Aldo Steinfeld, Zeyad T. Alwahabi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The optical properties and scattering distribution of thermographic phosphors have been demonstrated using a combined experimental and numerical method. ZnO:Zn and BaMgAl10O17:Eu2+ (BAM) are two types of widely used phosphors due to their stable physical properties and high-temperature sensitivities. To study their inter-phosphor light transfer, the angular scattering distribution and light propagation of these two phosphor suspensions was measured using a spectro-goniometric system. A collision-based Monte Carlo ray-tracing model was developed to extract their optical properties, including extinction coefficient, scattering albedo, asymmetry factors, and scattering fraction. With the void fraction around 0.98, the extinction coefficient of ZnO:Zn was determined to be 4.719, while that of F grade BAM and N grade BAM were 11.584 and 9.777, respectively. In addition, BAM had a higher scattering fraction (α = 0.99) than ZnO:Zn (α = 0.88). Due to the higher values of extinction coefficient and scattering fraction, BAM demonstrated more significant scattering than ZnO:Zn. Light transmission through phosphor suspensions was predicted along the direction of the light path. For ZnO:Zn, 70% of flux was scattered when the distance increases to 0.5, while for BAM, the distance was 0.15. Furthermore, with the same mass loading, smaller particle sizes can promote scattering and reduce the amount of light transmitted through phosphor suspensions.

Original languageEnglish (US)
Article number111741
JournalOptical Materials
StatePublished - Dec 2021

Bibliographical note

Funding Information:
Support was received from the Australian Research Council ( ARC ) through the Discovery Project DP180102045.

Publisher Copyright:
© 2021 Elsevier B.V.


  • Inter-phosphor light transfer
  • Optical properties
  • Scattering distribution
  • Thermographic phosphors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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