Eu3+ / Cu2+ co-doped rice husk ash borate glass: A sustainable material with red luminescence and NIR shielding

초록

In this work, rice husk ash was successfully recycled to be a part of Eu2O3/CuO co-doped borosilicate glass for luminescence and NIR shielding material. Glasses were studied in physical, optical, and luminescence properties to determine the optimal composition for related applications. The density, molar volume, and refractive index of KBa-RHA-B:CuEux glass increase with Eu3+ addition. In optical spectra, there are absorption peaks in visible light and NIR region under Cu2+ and Eu3+ transition. A broad absorption centered around 835 nm is degraded by adding Eu2O3, on a process of Cu2+ -> Cu+ conversion confirmed by XANES. The transmitted solar spectrum and the solar energy transmittance selectivity (SETS) indicates a balance in light transmission and NIR attenuation of KBa-RHA-B:CuEu1 glass which could be further developed for NIR protection windows. For photoluminescence properties, KBa-RHA-B:CuEu5 performs the highest intensity with red emission and similar to 1.5 ms decay time. Its emission peaks well collaborate with a plant action spectrum in moderate photosynthesis efficiency. This glass also allows blue light to drive the plant photosynthesis and attenuates NIR radiation, it can be applied in the greenhouse construction as well as red LED for enhancing the plant growth. Additionally, KBa-RHA-B:CuEu4 glass was found to respond with X-ray in radioluminescence spectrum, which capability was used to capture the plants organ by X-ray imaging technique.

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