This study addresses climate change and agricultural land degradation by introducing an innovative LED technology for sustainable indoor agriculture applications. A novel plant growth LED based on Sm3+ and Tm3+ co-doped luminescent glasses is developed with color-converting properties that emit blue and red light, which enhances photosynthesis and increases radiation reaching for responsible harvesting chlorophyll pigments. The developed LED exhibits a wide range of photoluminescence peak positions (454 to 648 nm), covering 50% and 39% of chlorophyll a and chlorophyll b absorption regions, respectively, with a satisfactory 56% photoluminescence quantum yield (PLQY). It also demonstrates robust performance and is unaffected by temperature variations and extended operation. A comparative study against using a commercial plant growth LED for growing Romaine lettuce reveals significant improvements in plant growth characteristics with the developed LED by increasing plant height, weight, leaf number, and chlorophyll a, chlorophyll b, and carotenoid content. However, the root diameter decreases, and the shoot-to-root ratio diminishes compared to the commercial LED. The study compares the Sm3+ and Tm3+ co-doped luminescent glass-based LED with other designs, exploring the impact of PLQY, photoluminescence position, and growing conditions. These findings highlight the developed LED's efficiency and sustainability for indoor horticulture lighting, crucial for meeting global food demands.
ACKNOWLEDGMENT
This work was supported by Yildiz Technical University Scientific Research Projects Coordination Unit under project number FYL-2022-5156. The first author also would like to acknowledge that this paper is submitted in partial fulfillment of the requirements for MSc degree at Yildiz Technical University. ORCID NO: 0000-0001-5268-7068
Anahtar Kelimeler: Indoor plant growth LED, lanthanide-doped luminescent glass, chlorophyll a/b, sustainable agriculture, photosynthetically active radiation, spectral coverage
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