Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Roll to Roll fabrication of synthesized Light Conversion Film

Chew Beng Soh1,a, Barbara Wei Ting Ang1, Szu Cheng Chien1, Hui An Chuan Beng Tay1 and Ryan Tay Hong Soon1

1 Engineering Cluster, Singapore Institute of Technology, 10 Dover Drive, S(138683), Singapore


The phase, dimension of synthesized lanthanide-doped nanoparticles dictates the optical properties of these nanoparticles and influence their light conversion properties. A systematic study on the effect of rare earth doping in the formation of NaYF4 upconversion nanoparticles was conducted. The rare earth element doping has a dual function of tuning particle size of hexagonal phase NaYF4 nanoparticles and stabilizing cubic phase NaYF4 nanoparticles as dependent on composition and concentration of the dopant ions of Erbium and Ytterbium. The Lanthanide-based upconversion nanoparticles (UCNPs) are able to convert two or more photons from lower energy levels to a higher energy level. The synthesized solution displayed good transmittance of 80% with significant dip in the transmittance at 980m nm, 1185 nm and 1418 nm. These signature dip of transmittance can be induced by light absorbance for conversion based on the bandgap energy of the NaYF4:Yb,Er. By combining the effects of NaYF4:Yb,Er and NaYF4:Yb,Tm, we are able to achieve the conversion of 980 nm wavelength light into visible light by tuning the composition of the lanthanide molar ratios. These nanoparticles are then dispersed uniformly in ethanol and fluoroethylene vinyl ether (FEVE) fluoropolymer, and then coated onto a polyethylene terephthalate (PET) film using a roll-to-roll film coater for application onto greenhouse facades. The modular acrylic enclosure shows a reduction of thermal radiation from black body positioned in the enclosure by 1.5°C over 1 hour duration under a strong LEDs lamp. The techniques reduced the solar irradiance, reduces the demand for active cooling technique and save the overall cost and yield for operation.

Keywords: Light Conversi3on, Lanthanides, synthesis, roll to roll coating

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