攙雜銪Ca2SiO4螢光體之發光特性研究

The photoluminescence studies of europium doped Ca2SiO4 phosphor

歐世傑(Shih-Chieh Ou)

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(2006年)

摘要

本實驗以固態反應法製備攙雜Eu的Ca2SiO4系螢光體；並探討燒成溫度、燒成時間、攙雜Eu濃度以及添加助熔劑等參數對其發光特性的影響；結果顯示，在燒成溫度1200℃，燒成時間8hrs，攙雜Eu濃度3.0~4.5mol%以及助熔劑B2O3 5wt%等燒成參數下，可以得到最佳的發光特性。
　　在大氣環境中燒成的Ca2SiO4:Eu3+螢光體，在製程中添加助熔劑B2O3，其結果發現可以小幅的增強結晶性；也可以增強其放射峰的強度，並發現隨著活化劑濃度的增加，發光強度也跟著變強。以624nm波長監測下，得到在395nm處有最強的吸收峰，再以395nm激發得到紅光範圍的582nm、587nm、589nm、595nm、613nm、624nm、650nm、683nm、686nm、703nm等放射峰，各別符合5D0→ 7F0、5D0→7F1、5D0→ 7F2、5D0→ 7F3和5D0→ 7F4等電子躍遷。
　　在還原氣氛下燒成的Ca2SiO4:Eu2+螢光體，以接近紫外光波長340nm激發得到發射峰505nm的4f65d1→ 4f7遷移的藍綠光放射。在最佳條件下燒成的螢光體可以觀察到當燒成溫度越高及助熔劑添加量提高時粉末粒徑有遞增的趨勢；但結果顯示粒徑嚴重缺乏均一性，粒徑從2μm~12μm不等。

關鍵字

矽酸鹽 ； 螢光體 ； 固態反應法 ； Ca2SiO4:Eu3+

並列摘要

The research is attempted to synthesize Ca2SiO4:Eu phosphors by using solid-state reaction method. Furthermore,Also to study Several controlling factors that could affect the phosphor’s luminescence characteristics, such as firing temperature, firing time, doped with different amounts of the activator(Eu) and the amount of B2O3 flux added were evaluated. The results appeared at firing temperature 1200℃, firing time 8hrs,the molar fraction of Eu from 3.0 to 4.5mol% and amount of B2O3 flux wt%,we could obtain the best photoluminescence characteristics.
Under air atmosphere to synthesize Ca2SiO4:Eu3+ phosphors,The process with B2O3 flux added,it could observe the intensity of crystallization was enhanced；also could enhance the intensity of emission peak and we could observe the intensity of emission spectrum would trend to increase when the molar fraction of Eu was enhanced. The excitation spectrum monitored at 624nm,obtained the strongest excitation peak at 395nm,and the emission spectrum excited by 395nm, showed redlight wavelength range that were 582nm、587nm、589nm、595nm、613nm、624nm、650nm、683nm、686nm、703nm, they were correspond to 5D0→ 7F0、5D0→7F1、5D0→ 7F2、5D0→ 7F3 and 5D0→ 7F4 transitions, respectively.
Under reducing atmosphere to synthesize Ca2SiO4:Eu2+ phosphors, the emission spectrum excited by 340nm,showed greenish emission peak at 505nm that due to 4f65d1→ 4f7 transition of Eu2+.
In the best condition of controlling factors, it could observe Ca2SiO4:Eu phosphors when the higher the firing temperature and the higher the flux added, particle size having more and more larger.but the results observed the particle size lacked without proportion seriously,and the average particle from 2μm to 12μm.

並列關鍵字

ortho-silicates ； phosphor ； solid-state reaction method ； Ca2SiO4:Eu3+

參考文獻

[1] H. Wei and I. Batarseh, “Comparison of basic converter topologies for power factor correction,” in Proc. IEEE Southeastcon '98,pp.348 –353, 24-26 Apr. 1998.

[6] David Green, Ph.D., P.Eng. Miruska Milanovic, B.Eng. Carmanah

[9] G.R.Fonda and F.SeitzJohn,“Preparation and Characteristics of Solid Luminescent Materials,”Wiley,Sons,Inc.,Chapman,Hall,LTD.,1948.

[10] G. Blasse and B.C Grabmaier, “Luminescent Materials”, Springer

Verlag, Berlin Heidelberg, Germany,1994.