光子学报
光子學報
광자학보
ACTA PHOTONICA SINICA
2009年
10期
2624-2628
,共5页
SrTiO_3:Pr~(3+)%溶胶-凝胶%第一性原理计算%共掺杂%发光效率
SrTiO_3:Pr~(3+)%溶膠-凝膠%第一性原理計算%共摻雜%髮光效率
SrTiO_3:Pr~(3+)%용효-응효%제일성원리계산%공참잡%발광효솔
SrTiO_3:Pr~(3+)%Sol-gel method%First principles calculation%Co-doping%Luminescence efficiency
采用溶胶凝胶法成功制备了SrTiO_3:Pr~(3+)、SrTiO_3:Pr~(3+), Mg~(2+)及SrTiO_3:Pr~(3+),Al~(3+)荧光粉.通过XRD、PL谱及第一性原理计算对样品的晶体结构、光谱特性及发光增强机制进行了研究.研究结果表明:共掺杂后,SrTiO_3:Pr~(3+)荧光粉为单一组成的SrTiO_3立方相,主发射锋位于617 nm,对应于Pr~(3+)离子的1D2→3H4跃迁发射.SrTiO_3:Pr~(3+),Mg~(2+) 及SrTiO_3:Pr~(3+), Al~(3+)荧光粉的发光强度分别是SrTiO_3:Pr~(3+)荧光粉发光强度的7倍和2倍,但主要发光机制没有改变.Mulliken布局分析表明,Mg~(2+)、Al~(3+)离子的掺入使SrTiO_3:Pr~(3+)荧光粉中Ti-O及Pr-O键的化学键增强、键长变短,SrTiO_3:Pr~(3+)基质向Pr~(3+)离子发光中心的能量传递效率提高,导致SrTiO_3:Pr~(3+),Mg~(2+) 及SrTiO_3:Pr~(3+),Al~(3+)荧光粉的发光效率提高.
採用溶膠凝膠法成功製備瞭SrTiO_3:Pr~(3+)、SrTiO_3:Pr~(3+), Mg~(2+)及SrTiO_3:Pr~(3+),Al~(3+)熒光粉.通過XRD、PL譜及第一性原理計算對樣品的晶體結構、光譜特性及髮光增彊機製進行瞭研究.研究結果錶明:共摻雜後,SrTiO_3:Pr~(3+)熒光粉為單一組成的SrTiO_3立方相,主髮射鋒位于617 nm,對應于Pr~(3+)離子的1D2→3H4躍遷髮射.SrTiO_3:Pr~(3+),Mg~(2+) 及SrTiO_3:Pr~(3+), Al~(3+)熒光粉的髮光彊度分彆是SrTiO_3:Pr~(3+)熒光粉髮光彊度的7倍和2倍,但主要髮光機製沒有改變.Mulliken佈跼分析錶明,Mg~(2+)、Al~(3+)離子的摻入使SrTiO_3:Pr~(3+)熒光粉中Ti-O及Pr-O鍵的化學鍵增彊、鍵長變短,SrTiO_3:Pr~(3+)基質嚮Pr~(3+)離子髮光中心的能量傳遞效率提高,導緻SrTiO_3:Pr~(3+),Mg~(2+) 及SrTiO_3:Pr~(3+),Al~(3+)熒光粉的髮光效率提高.
채용용효응효법성공제비료SrTiO_3:Pr~(3+)、SrTiO_3:Pr~(3+), Mg~(2+)급SrTiO_3:Pr~(3+),Al~(3+)형광분.통과XRD、PL보급제일성원리계산대양품적정체결구、광보특성급발광증강궤제진행료연구.연구결과표명:공참잡후,SrTiO_3:Pr~(3+)형광분위단일조성적SrTiO_3립방상,주발사봉위우617 nm,대응우Pr~(3+)리자적1D2→3H4약천발사.SrTiO_3:Pr~(3+),Mg~(2+) 급SrTiO_3:Pr~(3+), Al~(3+)형광분적발광강도분별시SrTiO_3:Pr~(3+)형광분발광강도적7배화2배,단주요발광궤제몰유개변.Mulliken포국분석표명,Mg~(2+)、Al~(3+)리자적참입사SrTiO_3:Pr~(3+)형광분중Ti-O급Pr-O건적화학건증강、건장변단,SrTiO_3:Pr~(3+)기질향Pr~(3+)리자발광중심적능량전체효솔제고,도치SrTiO_3:Pr~(3+),Mg~(2+) 급SrTiO_3:Pr~(3+),Al~(3+)형광분적발광효솔제고.
Al~(3+) and Mg~(2+)-doped SrTiO_3:Pr~(3+) phosphors are synthesized by a new sol-gel method and the mechanism on the enhancement of red luminescence intensity of SrTiO_3:Pr~(3+) by Al~(3+) and Mg~(2+) additions are investigated. From the photoluminescence (PL) spectra, X-ray diffraction patterns and Mulliken population analysis, it is speculated that one of the origins of the enhancement is the intensified Pr-O and Ti-O bonds by addition of Al~(3+) and Mg~(2+) in SrTiO_3:Pr~(3+). Because the Pr-O and Ti-O bonds are intensified and the corresponding bond lengths are reduced by addition of Al~(3+) and Mg~(2+) in SrTiO_3:Pr~(3+), the host to activator energy transfer efficiency is improved, leading to the enhancement of luminescence efficiency of SrTiO_3:Pr~(3+). And the fundamental excited mechanism in SrTiO_3:Pr~(3+) is not changed by addition of Al~(3+) and Mg~(2+).
