以溶膠凝膠法製備Zn2SiO4:Tb3+螢光體之研究

Phosphor Studies of Terbium(Ⅲ) Doped Zinc Silicate by Sol-Gel Method

朱凱偉(Kai-Wei Chu)

指導教授 ： 徐開鴻

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2005年)

摘要

本研究以溶膠凝膠合成法製備Zn2SiO4:Tb3+螢光體，探討燒成溫度、粉體結晶性、顆粒大小以及活化劑離子濃度等合成參數對螢光強度的影響。再藉由添加助熔劑B2O3，探討其對螢光體燒成溫度及發光性質之影響。再以傳統固態反應法製備Zn2SiO4:Tb3+，並以其作為對照組，比較以溶膠凝膠法與固態反應法製備Zn2SiO4:Tb3+兩者的差異所在並對其進行討論。實驗結果發現在溶膠凝膠法製備Zn2SiO4:Tb3+螢光體中，Tb3+離子最佳的摻雜濃度為5mol%，呈現543nm、588nm、614nm、621nm，5D4→7FJ(J=5、4、3、2)放射峰值，隨者燒成溫度的昇高，晶粒成長母體結晶性增高，螢光體所呈現的激發及放射光譜強度亦隨之增加，於1150℃持溫12小時燒成條件下，可得最強的激發及放射光譜。
另一方面在溶膠凝膠法製程中加入助熔劑B2O3=1、3、5wt%，發現對α−Zn2SiO4成相溫度的降低以及母體結晶性之增高並無助益。在溶膠凝膠法與固態反應法製備Zn2SiO4:Tb3+螢光體比較中，由實驗結果可得知，溶膠凝膠法相較於固態反應法有較均勻的元素分布情形，並具有較高的發光強度。

關鍵字

螢光體 ； 溶膠凝膠法 ； Zn2SiO4 ； Tb

並列摘要

This research is attempted to synthesize Zn2SiO4:Tb3+ phosphor by sol-gel route. To study the effect of firing temperature, crystalline, particle sizes and activator concentration on the photoluminescence (PL). Furthermore, look into the influence of flux B2O3 on firing temperature and PL. Lastly we synthesize Zn2SiO4:Tb3+ phosphor by the traditional solid-state method, as a comparison group to compare with sol-gel method in PL property.We observed that the luminescence intensity of Zn2SiO4:Tb3+ prepared from sol-gel route was found the best PL intensity when Tb3+=5mol%, appears the emission peaks 543nm、588nm、614nm、621nm which are correspond to the 5D4→7FJ(J=5、4、3、2) transition, respectively. The luminescence intensity increase with the firing temperature and crystalline rise. We can get the best luminescence intensity at firing temperature 1150℃ for 12hr.
Furthermore, we have also investigated the flux B2O3 influence luminescence and phase transform properties of Zn2SiO4.The result shows that B2O3 useless to make the α−Zn2SiO4 temperature down in sol-gel route.Compare the sol-gel method with the solid-state method to synthesize Zn2SiO4:Tb3+ phosphor, we observed that the sol-gel method have the better element spread and PL intensity than the solid-state method.

並列關鍵字

Phosphor ； Sol-Gel ； Zn2SiO4 ； Tb

參考文獻

[1]李碩重，照明設計學，全華科技股份有限公司 (1994)

Brinker George W. Scherer Harcourt Brace Jovanovich, Publishers

[25]Tae Hwan Choa, Ho Jung Chang Ceramics International 29 pp.611–618 (2003)

[2]D. A. Skoog, D. M. West, “Principles of Instrumental Analysis”, New York, Holt,

Reinhart ＆ Winstin, (1971)