YVO4:Pr3+螢光粉之合成及光致發光特性研究

Synthesis and Photo-Luminescent Properties of YVO4:Pr3+ Phosphors

王祐銘(Yu-Ming Wang)

指導教授 ： 林蕙琪

共同指導教授 ： 張益新(Yee-Shin Chang)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所在職專班/碩士(2013年)

https://doi.org/10.6827/NFU.2013.00149

摘要

本研究是利用固態反應法製備YVO4作為螢光粉主體材料，並以添加不同濃度之三價稀土金屬元素Pr3+離子作為發光中心，利用X光粉末繞射(XRD)、掃描式電子顯微鏡(SEM)、紫外可見光全反射光譜與光激發光光譜儀進行其結構與發光特性鑑定。探討YVO4主體材料的煆燒溫度、摻雜濃度、及電荷補償後對主體晶格和螢光性質的影響。
於YVO4:Pr3+之螢光粉系列，由XRD結果顯示，在煆燒溫度1100℃持溫8小時的條件下，可得到斜方晶系YVO4之結晶結構，而其粉體表面形態並不會因Pr3+離子摻雜濃度的多寡而有所影響。激發光譜顯示YVO4: Pr3+螢光粉體於250~350 nm 間出現寬廣的激發帶是由於Pr3+-O2-間電荷轉移躍遷所造成，而於450~500 nm 區間的激發峰是來自於Pr3+離子4f內層軌域的電子躍遷；在324 nm 的激發下，其放射光譜由Pr3+離子的3P0→3H4,3H5,3H6和1D2→3H4電子躍遷所構成，分佈於460-490 nm、560-580 nm、590-620 nm範圍中； Pr3+離子添加濃度增加到0.3 mol%時，可得最佳的發光強度，臨界距離(Rc)為18.51Å，CIE色度座標為(X=0.272, y=0.188)。

關鍵字

螢光粉 ； 固態反應法 ； YVO4 ； 臨界距離 ； 色度座標

並列摘要

In this study, YVO4 was selected as the host material and doped with different concentrations of Pr3+ ions which were synthesized using solid-state reaction method. The structure, micrographics and photoluminescence properties of the synthesized phosphors were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer, respectively.
The XRD results showed that the crystal structure of YVO4:Pr3+ phosphors calcined 1100℃for 8 hr can be attributed to the Orthorhombic structure for YVO4. The SEM images show the particles are irregular, but more uniform distribution for Pr3+ ion concentration is 0.3 mol%. The excitation spectra of YVO4:Pr3+ shows a broad excitation band in the wavelength range of 250-350 nm resulting from the charge transfer transition of Pr3+-O2-. In the wavelength region of 450-500 nm, originates from the f-f transition of 3H4-3P2 within Pr3+ 4f electron configuration. The emission spectra for YVO4:Pr3+ phosphor show that there are the 3P0→3H4, 3H5, 3H6 and 1D2→3H4 transition of Pr3+ ion under an excitation wavelength of 458 nm. The maximum emission intensity is obtained for YVO4 doped with 0.3 mol% Pr3+ ions with a CIE chromaticity coordinates of (x=0.272, y=0.188) and Rc=18.51Å.

並列關鍵字

Phosphor ； Solid-stste reaction ； Oxygen vacancy ； YVO4 ； XRD ； SEM

參考文獻

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