A Multi‐functional Smart Window for Converting Sunlight into Absorbable Fluctuating Light to Enhance Plant Growth and Stress Tolerance

Abstract Environmental stressors such as environmental changes and UV radiation can significantly hinder plant growth and development. To promote plant growth, phosphors excited by light‐emitting diodes (LEDs) have garnered significant research attention because they can convert the light emitted by LEDs into specific wavelengths that plants can absorb for photosynthesis. However, this approach has some limitations: the phosphors are costly to power continuously, and their fixed luminous intensity creates a static light environment that enhances photorespiration. In this study, Sr ₃ Lu ₂ Ge ₃ O ₁₂ : 0.05%Bi ³⁺ , 0.03%Mn ²⁺ nanophosphors/polydimethylsiloxane multi‐functional smart window is introduced with persistent luminescence and optical stimulated luminescence properties. This window produces red and blue luminescent fluctuating light when excited by sunlight during the day, and emits red and blue PersL fluctuating light at night by releasing the stored light energy continuously. This fluctuating light environment reduces the effects of photorespiration. The red and blue light synergistically enhance photosynthetic efficiency, accelerate plant growth. Testing with peas under salinity, drought, and low temperature stress conditions reveals improved growth and stress tolerance indicators, demonstrating increased plant stress tolerance. This technology enables plants to thrive under stress conditions, addressing yield problems, thereby enhancing the stability and economic efficiency of agricultural production systems.