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摘要:以正硅酸四乙酯為硅源（TEOS），用溶膠凝膠法制備了SiO2干凝膠和粉體，研究了鹽酸（HCL）與醋酸（HAc）、錳離子以及熱處理溫度對其光致發(fā)光性能的影響。結果表明：激發(fā)光為210nm時，隨熱處理溫度的增加，SiO:HCL干凝膠發(fā)光強度先下降，后上升，而 SiO:HAc發(fā)光強度為先上升，后下降。熱處理溫度為300°C時，發(fā)光強度II，升高至500°C、700°C 時，I﹤I。SiO:HCL的發(fā)光峰位為341nm、423nm，而SiO:HAc的為360nm、435nm。摻雜錳離子后，隨熱處理溫度的升高，樣品的發(fā)光強度均逐漸降低，而發(fā)光峰位沒有變化，位于341nm，423nm處。 關鍵詞：二氧化硅；光致發(fā)光；催化劑；激活劑；溫度
Abstract:Using TEOS as the silica source, SiO2 xerogel and powder are prepared by sol-gel techniques. We have studied the hydrochloric acid (HCL) and acetic acid (HAc), manganese ions and heat treatment temperature on the light-induced luminescent properties. The results showed that when the excitation light is 210nm, with the increase of annealing temperature, SiO2: HCL luminous intensity of the first drop of dry gel, and then increased, while the SiO2: HAc luminous intensity is first increase and then decreased. When heat treatment temperature is 300°C, the luminous intensity II, rising to 500°C, 700°C while, I﹤I. SiO2: HCL emission peak position for the 341nm, 423nm, and SiO2: HAc for 360nm, 435nm. Doped with manganese ions, with the heat treatment temperature, the sample of luminous intensity decreased gradually, while the emission peak position does not change, at 341nm, 423nm. Keywords: Silica; Photoluminescence; Catalyst; Activator; Temperature |
