Singapore Institute of Technology

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Up-Conversion of Infrared Spectrum to Visible Spectrum with NaYF4:Yb3+/Er3+ Coated Film for Façade Envelope

Excessive heat build-up in buildings is undesirable and excess infrared (IR) radiation can be attenuated via up-conversion (UC) of IR to visible light. Sodium Yttrium Fluoride co-doped with Ytterbium and Erbium hexagonal micro-prism phosphors were synthesized for the up-conversion of IR to visible wavelengths. These synthesized UC phosphors were uniformly dispersed into an epoxy matrix for application on a transparent laminated film substrate via the Doctor Blade method. This UC phosphor coating reduced thermal irradiance and consequently a much lower interior temperature was achieved compared to a structure envelope without the coated film.


Singapore Food Agency SFS-RND-SUFP-001-09


Journal/Conference/Book title

ECS Journal of Solid State Science and Technology

Publication date



  • Post-print

Corresponding author

Chew Beng Soh

Project ID

  • 8624 (R-SFA-A403-0001) Urban-Metabolic Farming-Module (UmFm): A Novel Farming Module towards Eco-resilient Megacity Farmscape in 2030