YInGe2O7共摻Pr3+,Sc3+螢光粉之光致發光特性研究

Synthesis and Photoluminescence Properties of Pr3+ and Sc3+ co-doped YInGe2O7 phosphors

蘇彥璋(Yan-Jhang Su)

指導教授 ： 張益新

國立虎尾科技大學/電機資訊學院/電子工程系碩士班/碩士(2016年)

摘要

本研究以溶膠-凝膠法製備YInGe2O7作為螢光粉主體，並摻雜不同濃度之稀土金屬離子Pr3+作為發光中心，共摻Sc3+離子觀察摻雜濃度對螢光粉之晶體結構與發光特性之影響。
在由YInGe2O7摻雜Pr3+離子螢光粉系列，XRD分析結果顯示，在煆燒溫度1200 oC，持溫6小時條件下，可得到單斜晶系YInGe2O7之結構。且隨著Pr3+離子摻雜濃度增加至20 mol%皆為單一相，並無二次相生成。而在SEM分析方面，YInGe2O7:Pr3+螢光粉表面型態皆為不規則形狀，隨著Pr3+離子濃度增加，螢光粉顆粒尺寸有逐漸增加之趨勢。在主體248 nm激發下，其放射由主體本身發光及Pr3+離子的3P03H4,5,6、3F2和1D23H4之電子躍遷所造成，發光帶分佈於350 ~ 450 nm、480 ~ 510 nm、530 ~ 560 nm、600 ~ 620 nm、625 ~ 640 nm、645 ~ 660 nm中。當Pr3+離子濃度為0.5 mol%時有最佳放射，CIE色度座標隨摻雜濃度增加由橘紅光區偏移至近白光區再偏移至藍光區。在451 nm直接激發下，其主要放射光波長坐落於480~510 nm和600~620 nm之間屬於Pr3+離子之3P03H4和1D23H4之電子躍遷所造成，當Pr3+離子濃度為10 mol%時，發生濃度淬滅效應有最強的綠光放射，CIE色度座標隨摻雜濃度增加由黃綠光區偏移至綠光區。
此外在YInGe2O7共摻Pr3+,Sc3+螢光粉系列中，固定Pr3+離子濃度為3 mol%，共摻不同濃度的Sc3+離子。在248激發下，當Sc3+離子摻雜濃度為3 mol%時，發光能帶1D2→3H4能階躍遷強度有明顯增強，發光峰值為608 nm，CIE色度座標隨摻雜濃度增加會先偏移至粉色區偏移回近白光區。

關鍵字

螢光粉 ； 溶膠凝膠法 ； Pr3+離子

並列摘要

In this study, YInGe2O7 phosphor was selected as the host material, doped with different Pr3+ ion concentrations, co-doped with Sc3+ ion, and the crystal structure, photoluminescence properties were then investigated.
For Pr3+ ion-doped YInGe2O7 phosphors, the XRD results show that the crystal structure can be attributed to the monoclinic YInGe2O7 structure calcined 1200 oC for 6 h. The peaks are single phase and no secondary phases appear when the Pr3+ ions concentrations increase to 20 mol%.The SEM results show that there are irregular shapes for surface morphology and the grain size become bigger as the Pr3+ concentration increased. By host 248 nm excitation, the emission band appear in the range of 350 ~ 450 nm, which is attributed to the YInGe2O7 host.A series of sharp emission band appear in the range of 480 ~ 510 nm、530 ~ 560 nm、600 ~ 620 nm、625 ~ 640 nm、645 ~ 660 nm, respectively corresponding to the 3P03H4,5,6、3F2 and 1D23H4 electron transition of the Pr3+ ion.By 451 nm direct excitation, the main emission band appear in the range of 480~510 nm, 600~620 nm, respectively corresponding to the 3P03H4 and 1D23H4 electron transition of the Pr3+ ion.The strongest green emission appear when the Pr3+ ion concentrations increase to 10 mol%, the CIE chromaticity coordinates shift to the green region from yellowish-green region appear with concentration increased.
In addition, in order to enhance the photoluminescence properties of YInGe2O7: Pr3+ phosphors, the Pr3+ ion concentrations was fixed for 3 mol% and doped with different Sc3+ ion concentrations. By 248 nm excitation, the 1D23H4 emission intensities were enhanced for Pr3+ ion concentrations is 3 mol%, the CIE chromaticity coordinates shift to the white light region from pink region appear with concentration increased.

並列關鍵字

phosphor ； sol-gel method ； Pr3+ ion

參考文獻

[4] Y. S. Chang, H. J. Lin, Y. L. Chai, Y. C. Li, “Preparation and luminescent properties of europium-activated YInGe2O7 phosphors” J. Alloy. Compd. 460 (2008) 421.

[5] Z. Liu, Y. Li, Y. Xiong, D. Wang, Q. Yin, “Electroluminescence of SrAl2O4:Eu2+ phosphor”, Microelectronics Journal 35 (2004) 375.

[6] W. T. Hsu, W. H. Wu, C. H. Lu, ” Synthesis and luminescence properties of nano-sized Y3Al5O12:Eu3+ phosphors ” Mater. Sci. Eng. B104 (2003) 40.

[7] S. D. H., S. P. Khatkar, V. B. Taxak, G. S., D. K., “Synthesis, luminescence and effect of heat treatment on the properties of Dy3+-doped YVO4 phosphor” Mater. Sci. Eng. B 129 (2006) 126.

[8] Y. C. Li, Y. H. Chang. Li, Y. F. Lin, Y. S. Chang, Y. J. Lin, “Synthesis and luminescent properties of Ln3+( Eu3+, Sm3+, Dy3+)-doped lanthanum aluminum germinate LaAlGe2O7 phosphors” J. Alloy. Compds. 439 (2007) 367.