摘要
摻雜銪和鏑的鋁酸鍶是最廣泛研究的磷光體之一，因為它具有高強度和長持久時間。在這項研究中，使用了基於鋁酸鍶的磷光體，特別是Sr4Al14O25:Eu2+,Dy3+ 的獨特特性，並使用在常見的室內植物Epipremnum aureum（黄金葛）的光源，以觀察其對二氧化碳的影響。在低光照條件下還原CO2 植物的性質。使用溶液燃燒法合成Sr4Al14O25:Eu2+,Dy3+ 磷光體。將化學計量的含水前體溶解在水中，然後置於600 ℃的高溫爐中8小時，得到白色泡沫狀無定形前體粉末。將前體粉末冷卻至室溫，然後研磨。研磨後，將粉末在1300 ℃下煅燒8小時。實驗室合成的螢光體和市售螢光體的粒徑分別為71.9 ± 39.8 μm和90.9 ± 26.5 μm。兩者均表現出不規則形此外，XRD結果表明，成功地形成了所需的正交相，與商業磷光體幾乎沒有差別。 Eu2+ 和Dy3+ 的量在0.25至1.50 mole ％ 之間變化，並且選擇具有最佳光致發光性質的磷光體用於核 - 殼包封實驗。具有最高強度和最長衰減時間的磷光體分別為1.00 mole ％ 和1.50 mole ％ 摻雜的磷光體，其使用光致發光光譜法測定。
然後將粉末用二氧化矽顆粒包封，以防止在煅燒期間沒有還原氣氛的Eu2+ 的進一步氧化和在與水接觸時顆粒的水解。通過使用NH4OH, HCl和UV /臭氧處理來改變包封過程的催化劑。然後使用TEM-EDX和光致發光光譜法表徵所獲得的顆粒。 TEM結果表明，所有三種設置都實現了核 - 殼結構。此外，耐水性測量表明，使用HCl形成的核/殼顆粒具有最有效的塗層。
然後使用天然油和蠟的優化混合物作為黏合劑將核 - 殼顆粒附著到 黄金葛 的表面 。發現黏合劑的最佳組成為蓖麻油中的20％蜂蠟。該組合物在光譜的可見光範圍內表現出最高的透射率。監測添加核/殼螢光體顆粒作為外部光源對植物的二氧化碳還原的影響，並與應用商業螢光體和不含螢光體的對照樣品的參考樣品進行比較。結果表明，磷光體和黏合劑的應用阻礙了植物的有效二氧化碳還原。該結果主要歸因於蠟/油基黏合劑阻塞植物葉子上表面上的氣孔。該結果還妨礙了磷光體 - 植物相互作用的準確表徵。進一步研究的建議包括探索其他類型的黏合劑，並測試具有更有利的氣孔結構的不同植物物種。

Abstract
Strontium Aluminate (SrxAlyOz) doped with Europium (Eu) and Dysprosium (Dy) is one of the most widely studied phosphors because of its high intensity and long persistence time. In this study, the unique characteristics of Strontium Aluminate based phosphors, specifically Sr4Al14O25:Eu2+,Dy3+, was utilized and was used as light source for a common species of house plant called Epipremnum aureum (Money plant) to observe its effect on the carbon dioxide reduction properties of the plant in low light conditions. The Sr4Al14O25:Eu2+,Dy3+ phosphor was synthesized using the solution combustion method. Stoichiometric amounts of aqueous precursors were dissolved in water, then placed in a high temperature furnace at 600 0C for 8 Hours to obtain a white, foamy, amorphous precursor powder. The precursor powder was cooled to room temperature and then ground. After grinding, the powders were calcined for 8 hours at 1300 0C. The particle size of the Lab synthesized phosphor and the Commercial phosphor was found to be 71.9 ± 39.8 µm and 90.9 ± 26.5 µm respectively. Both exhibited irregular morphology. Moreover, the XRD results show that the desired orthorhombic phase was successfully formed with little to no difference with the commercial phosphor. The amount of Eu2+ and Dy3+ was varied from 0.25 to 1.50 mole % and the phosphor with the best photoluminescent properties was selected for the core-shell encapsulation experiments. The phosphor with highest intensity and longest decay time was the 1.00 mole % and the 1.50 mole % doped phosphor, respectively, which was determined using Photoluminescence Spectroscopy.
The powders were then encapsulated with silica particles to prevent the further oxidation of Eu2+ without a reducing atmosphere during calcination and the hydrolysis of the particles when in contact with water. The catalysts of the encapsulation process were varied by using NH4OH, HCl, and UV/Ozone Treatment. The obtained particles were then characterized using TEM-EDX, and Photo Luminescence Spectroscopy. The TEM results show that the Core-shell structure was achieved for all three settings. Moreover, water resistance measurements show that the core/shell particle formed using HCl has the most effective coating.
The core-shell particles were then attached to the surface of the Money plant using an optimized mixture of natural oils and waxes as adhesive. The optimal composition of the adhesive was found to be 20% Beeswax in Castor Oil. This composition exhibited the highest transmission in the visible range of the spectrum. The effect of the addition of the core/shell phosphor particles as an external light source on the carbon dioxide reduction of the plant was monitored and compared to a reference specimen applied with commercial phosphor and a control specimen without the phosphor. Results show that the application of the phosphor and adhesive impeded the effective carbon dioxide reduction of the plant. This result is mainly attributed to the blockage of the stomata on the upper surface of the plant leaves by the wax/oil based adhesive. This result also prevents the accurate characterization of the phosphor light – plant interaction. Recommendations for further studies include exploring other types of adhesives, and testing different plant species with more favorable stomatal structures.

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