隨著全球暖化與氣候變遷問題日益嚴峻，發展具潛力的碳中和技術成為當前環境科學領域的重要課題。本研究合成一種具儲能發光特性之長餘輝材料──摻雜銪與鏑之硫化鈣磷光粉（CaS:Eu,Dy），並將其應用於白鶴芋（Spathiphyllum）葉片表面，以探討其對植物光合作用與碳固定能力之影響。該磷光材料能吸收環境光源，將短波長光轉換為長波長紅光，進一步提供植物進行光合作用所需的有效光源，期望藉此增強植物碳匯潛力。
經光致發光特性分析，CaS:Eu,Dy於 514 nm 激發波長下可發出波長 652 nm 之紅光。其中，摻雜比例為 0.5 mol% Eu、0.25 mol% Dy 之樣品具最佳餘輝效能，其螢光弛豫時間為 2.392 秒。為提升其環境穩定性，進一步採用二氧化矽（SiO₂）作為包覆層，以防止材料吸濕分解並延長其功能壽命。
透過葉綠素螢光 OJIP 曲線分析顯示，磷光粉處理並未對植物生理造成負面影響，白鶴芋葉片可維持正常健康狀態，且整體光化學效能PI(abs)和PI(total)有明顯提升。此外，經 CaS:0.5%Eu,0.25%Dy 處理之葉片，其光合作用效率相較控制組提升約 42%，可使每平方米葉面每日額外固定約 0.045 mol 之二氧化碳。值得注意的是，在無光環境下，葉片仍能釋放紅光，不僅增強其固碳機能，亦提高室內植物之觀賞價值。

With the escalating severity of global warming and climate change, the development of potential carbon-neutral technologies has become a critical focus in environmental science. In this study, a long-persistent phosphorescent material with energy-storing capabilities—calcium sulfide phosphor doped with europium and dysprosium, denoted as CaS:Eu,Dy—was synthesized and applied to the surface of Spathiphyllum leaves. This phosphor material can absorb ambient light and convert short-wavelength radiation into long-wavelength red light, thereby providing an additional light source to facilitate photosynthesis in plants and enhance their carbon sequestration potential.
Photoluminescence (PL) analysis revealed that CaS:Eu,Dy emits red light at a wavelength of 652 nm when excited at 514 nm. Among the tested compositions, the sample doped with 0.5 mol% Eu and 0.25 mol% Dy exhibited the most favorable afterglow performance, with a fluorescence decay time of 2.392 seconds. To improve environmental stability, a silica (SiO₂) coating was applied to the particle surface to prevent moisture-induced degradation and extend the material’s functional lifetime.
Analysis of chlorophyll fluorescence using the OJIP transient curve indicated that the application of the phosphor did not adversely affect the physiological condition of the plants, with treated Spathiphyllum leaves remaining healthy. Furthermore, key photochemical performance indices, PI(abs) and PI(total), were significantly enhanced. Leaves treated with CaS:0.5%Eu,0.25%Dy demonstrated approximately 42% higher photosynthetic efficiency compared to the untreated control group, enabling an additional daily carbon fixation of approximately 0.045 mol CO₂ per square meter of leaf area. Notably, the leaves were also capable of emitting red light in the absence of illumination, thereby not only enhancing carbon fixation potential but also improving the ornamental value of indoor plants

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