稀有金属与硬质合金
稀有金屬與硬質閤金
희유금속여경질합금
RARE METALS AND CEMENTED CARBIDES
2009年
4期
1-6
,共6页
李锋锋%张明熹%沈毅%王少燕%Charles Christopher Sorrell
李鋒鋒%張明熹%瀋毅%王少燕%Charles Christopher Sorrell
리봉봉%장명희%침의%왕소연%Charles Christopher Sorrell
溶胶-凝胶%YAG:Ho~(3+)%Yb~(3+)%纳米晶%上转换发光
溶膠-凝膠%YAG:Ho~(3+)%Yb~(3+)%納米晶%上轉換髮光
용효-응효%YAG:Ho~(3+)%Yb~(3+)%납미정%상전환발광
sol-gel%YAG:Ho~(3+),Yb~(3+)%nanocrystal%upconversion luminescence
以稀土氧化物和硝酸铝为原料,采用溶胶-凝胶法合成了YAG:1%Ho~(3+),1%Yb~(3+)纳米晶,并通过正交试验法确定其干凝胶的合成条件.采用DTA-TG、XRD及TEM对干凝胶的合成过程、纳米晶的晶相组成及形貌进行了研究,表明干凝胶经1 200 ℃煅烧后形成了结晶完全的YAG相,无中间相产生.吸收光谱和上转换发射光谱分析表明,Yb~(3+)在材料的发光过程中具有传递能量的作用,Ho~(3+)在跃迁过程中发射出中心波长为650 nm的红色上转换荧光及540 nm的绿色上转换荧光.
以稀土氧化物和硝痠鋁為原料,採用溶膠-凝膠法閤成瞭YAG:1%Ho~(3+),1%Yb~(3+)納米晶,併通過正交試驗法確定其榦凝膠的閤成條件.採用DTA-TG、XRD及TEM對榦凝膠的閤成過程、納米晶的晶相組成及形貌進行瞭研究,錶明榦凝膠經1 200 ℃煅燒後形成瞭結晶完全的YAG相,無中間相產生.吸收光譜和上轉換髮射光譜分析錶明,Yb~(3+)在材料的髮光過程中具有傳遞能量的作用,Ho~(3+)在躍遷過程中髮射齣中心波長為650 nm的紅色上轉換熒光及540 nm的綠色上轉換熒光.
이희토양화물화초산려위원료,채용용효-응효법합성료YAG:1%Ho~(3+),1%Yb~(3+)납미정,병통과정교시험법학정기간응효적합성조건.채용DTA-TG、XRD급TEM대간응효적합성과정、납미정적정상조성급형모진행료연구,표명간응효경1 200 ℃단소후형성료결정완전적YAG상,무중간상산생.흡수광보화상전환발사광보분석표명,Yb~(3+)재재료적발광과정중구유전체능량적작용,Ho~(3+)재약천과정중발사출중심파장위650 nm적홍색상전환형광급540 nm적록색상전환형광.
YAG:1%Ho~(3+),1%Yb~(3+) nanocrystal was synthesized by a sol-gel process from the mixed solution containing aluminum nitrate and rare earth oxide.The technological conditions to synthesize its xerogel were determined by orthogonal tests. DTA-TG,XRD and TEM techniques were used to study the synthesis process of the xerogel and characterize the crystal structure and morphology of the prepared YAG:1%Ho~(3+),1%Yb~(3+).The results show that monophase YAG crystallite can be formed without any intermediate phase after calciningthe xerogel at 1 200 ℃.Absorption spectrum and upconversion emission spectrum of YAG:1%Ho~(3+),1%Yb~(3+)nanocrystal were investigated.Yb~(3+)ions have the function of transferring energy in the luminescence process.Contributed to the Ho~(3+)transition,strong red and green upconversion fluorescence can be observed centered at 650 nm and 540 nm,respectively.
