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Updated: Jun 12, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Published on: April 16, 2017

Enhancing the Transparency-Temperature Trade-Off Through Spectral Engineering and Radiative Cooling.

Pharit Gridtayawong1,2, Taweesak Kaewmanee1,2, Wachara Benchaphanthawee1,2

  • 1School of Materials Science and Innovation Faculty of Science Mahidol University Nakhon Pathom Thailand.

Small Science
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

New greenhouse films manage solar heat gain in tropical climates by controlling light spectra and using radiative cooling. This technology reduces daytime temperatures, enhancing crop productivity and greenhouse efficiency.

Keywords:
TiO2–PET multilayer filmsgreenhouse thermal managementpassive daytime radiative coolingspectral engineeringtransparency–cooling trade‐off

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Area of Science:

  • Materials Science
  • Agricultural Engineering
  • Optics

Background:

  • Excess solar heat gain and near-infrared (NIR) transmission in conventional greenhouse films limit productivity in tropical climates.
  • Accumulation of thermal energy by polymer covers exacerbates heat stress for crops.

Purpose of the Study:

  • To develop and evaluate a scalable multilayer greenhouse film for mitigating daytime heat stress in tropical climates.
  • To manage solar radiation through spectral engineering and radiative cooling for improved greenhouse environments.

Main Methods:

  • Fabrication of a multilayer film with a TiO2-embedded PET scattering layer and UV-IR selective films.
  • Design of two film configurations for different crop-dependent light requirements (57% and 37% photosynthetically active radiation transmission).
  • Characterization of spectral properties, including NIR rejection and emissivity in the atmospheric window (8-13 µm).

Main Results:

  • Multilayer films achieved 80-92% NIR transmission suppression and near-unity emissivity (ε¯ ≈ 0.99).
  • Outdoor tests showed daytime temperature reductions of 3-5°C compared to commercial films.
  • The PET-based laminate demonstrated high mechanical robustness (69-92 MPa tensile strength).

Conclusions:

  • Spectral engineering of greenhouse films is a practical strategy for passive cooling in hot climates.
  • The developed films effectively manage the trade-off between transparency and cooling.
  • This technology offers a viable solution for enhancing greenhouse productivity in tropical regions.