矽酸鍶螢光粉Sr(subscript 1.93-x)MxSiO4: Eu^(2+)(subscript 0.07)摻雜鹼土離子（M=Ba^(2+)、Mg^(2+)、Ca^(2+)）製備及其性質研究

Preparation and Study of Characteristics for Sr(subscript 1.93-x)MxSiO4:Eu^(2+)(subscript 0.07) (M=Ba^(2+), Mg^(2+), Ca^(2+))

翁菁穗(Ching-Sui Weng)；傅彥培(Yen-Pei Fu)

鹼土矽酸鹽螢光粉 ； 溶膠凝膠法 ； 發光性質 ； silicate phosphor ； sol-gel method ； photoluminescence properties

臺灣鑛業

66卷1期（2014 / 03 / 01）

41 - 53

繁體中文

Sr2SiO4:Eu^(2+)螢光粉近期有許多文獻研究應用在LED（Light-Emitting Diode），是由於矽酸鹽螢光粉具有較好的結構穩定性及較高的熱穩定性，且可以在紫外光的範圍下被激發。故本研究藉由溶膠凝膠法製備矽酸鹽類螢光粉，觀察摻雜不同鹼土金屬（M=Ba、Mg、Ca）之矽酸鹽螢光粉對於其發光特性的影響。根據XRD的結果，摻雜3種不同鹼土離子之螢光粉體主要結構都為α-Sr2SiO4，但是同時具有SrCO3的雜相生成。根據FT-IR圖譜中，也可以觀察到具有α-Sr2SiO4及SrCO3的鍵結存在，對照兩種分析結果是相符合的。利用SEM觀察螢光粉體之表面形貌，可以發現螢光粉的顆粒大小不均，呈不規則形狀，且有明顯的團聚堆積現象產生。比較PL圖譜結果，分別以370nm及410nm波長激發下，Ba^(2+)離子摻雜的比例為0.3、0.4、0.5mole的時候，在516nm的位置有一明顯的綠光的放射光產生；摻雜Mg^(2+)離子之螢光粉在616nm的位置有一橘紅色放射光產生；在410nm波長激發下在610nm位置有一波長產生，隨著Ca^(2+)摻雜量的變化，會造成放射波長位移。比較3種不同鹼土元素的摻雜，由於Ca^(2+)離子的摻雜會造成放射波長位移，且其發光性質不佳；而摻雜Mg^(2+)離子雖然在616nm的位置有一橘紅色放射光產生，但由於Mg^(2+)離子與Sr^(2+)離子的半徑差距太大，造成其晶格嚴重變形；故認為摻雜Ba^(2+)離子的螢光粉體之螢光性質較其他兩者佳。

Alkaline earth silicate phosphor was reported to used in LEDS for improving the problems of lightness and efficiency. Sr2SiO4:Eu^(2+) phosphor have advantages of stable crystal structure and high thermal stability and emitted under ultraviolet (UV).In this study, It was synthesized by sol-gel method, and add alkaline earth elements (M= Ba, Mg, Ca) to replace Sr in the lattice, and observed the influence between different morphology of phosphor.(Sr,M)1.93SiO4:Eu^(2+)0.07 (M=Ba, Mg, Ca) phosphor had two phase, main phase α-Sr2SiO4 and impurity phase SrCO3, from X-ray diffraction spectrum. The same result can observed from FT-IR spectrum, and it also showed the bonds of α-Sr2SiO4 and SrCO3. The micrographs was shows that phosphor had different grain sizes and aggregated by scanning electron microspectrum. From the emission spectrum in 370nm and 410nm excitation wavelengths by Fluorescence Spectroscopy, the phosphors which doped Ba2+ ions showed a peak on 516nm when the amount of Ba^(2+) ions were 0.3mole to 0.5mole, the phosphors which doped Mg^(2+) ions showed a peak on 616nm, and the phosphors which doped Ca^(2+) ions showed a peak on 610nm.Comparison of results which doped three different alkaline earth elements, Sr(subscript 1.93-x)CaxSiO4:Eu^(2+)(subscript 0.07) phosphors will cause wavelength displacement, and had poor luminescence properties, and Sr(subscript 1.93-x)MgxSiO4:Eu^(2+)(subscript 0.07) phosphors at 616nm had an orange radiation wavelength, but because of radius between Mg^(2+) ions and Sr^(2+) ion is different to cause lattice deformation, so it showed Sr(subscript 1.93-x)BaxSiO4:Eu^(2+)(subscript 0.07) phosphors fluorescence properties was better than other two.