化工新型材料
化工新型材料
화공신형재료
NEW CHEMICAL MATERIALS
2010年
1期
41-43
,共3页
李锋锋%王少燕%董翠芝%张明熹%杨瑜%沈毅
李鋒鋒%王少燕%董翠芝%張明熹%楊瑜%瀋毅
리봉봉%왕소연%동취지%장명희%양유%침의
溶胶-凝胶%YAG%Yb~(3+)%Tm~(3+)%上转换发光
溶膠-凝膠%YAG%Yb~(3+)%Tm~(3+)%上轉換髮光
용효-응효%YAG%Yb~(3+)%Tm~(3+)%상전환발광
sol-gel process%YAG%Yb~(3+)%Tm~(3+)%upeonversion luminescence
以稀土氧化物、硝酸铝为原料,采用溶胶-凝胶法合成了Yb~(3+)、Tm~(3+)共掺的钇铝石榴石(Y_3Al_5O_(12),YAG)纳米晶粉体.采用X射线衍射(XRD)确定了1200℃煅烧后的晶体粉为纯YAG结构,无杂质相,晶体尺寸约为90nm;该粉体在波长为980nm的半导体激光器激发下发射出中心波长为487nm的蓝色上转换荧光,对应于Tm~(3+)离子的~1G_4→~3H_6的跃迁.发光强度和激发功率关系的研究揭示了其为双光子过程,Tm~(3+)的激发态吸收及Tm~(3+)、Yb~(3+)间的交叉驰豫型能量传递和是该上转换发光的主要机制.
以稀土氧化物、硝痠鋁為原料,採用溶膠-凝膠法閤成瞭Yb~(3+)、Tm~(3+)共摻的釔鋁石榴石(Y_3Al_5O_(12),YAG)納米晶粉體.採用X射線衍射(XRD)確定瞭1200℃煅燒後的晶體粉為純YAG結構,無雜質相,晶體呎吋約為90nm;該粉體在波長為980nm的半導體激光器激髮下髮射齣中心波長為487nm的藍色上轉換熒光,對應于Tm~(3+)離子的~1G_4→~3H_6的躍遷.髮光彊度和激髮功率關繫的研究揭示瞭其為雙光子過程,Tm~(3+)的激髮態吸收及Tm~(3+)、Yb~(3+)間的交扠馳豫型能量傳遞和是該上轉換髮光的主要機製.
이희토양화물、초산려위원료,채용용효-응효법합성료Yb~(3+)、Tm~(3+)공참적을려석류석(Y_3Al_5O_(12),YAG)납미정분체.채용X사선연사(XRD)학정료1200℃단소후적정체분위순YAG결구,무잡질상,정체척촌약위90nm;해분체재파장위980nm적반도체격광기격발하발사출중심파장위487nm적람색상전환형광,대응우Tm~(3+)리자적~1G_4→~3H_6적약천.발광강도화격발공솔관계적연구게시료기위쌍광자과정,Tm~(3+)적격발태흡수급Tm~(3+)、Yb~(3+)간적교차치예형능량전체화시해상전환발광적주요궤제.
Yb~(3+) ,Tm~(3+) co-doped Yttrium aluminum gamet(Y_3Al_5O_(12), YAG) nanocrystal powders were synthe-sized by a sol-gel process from a mixed solution containing aluminum nitrates and rare-earth oxides. XRD technique was used to characterize struetures of sample and precursor. It was found that Mono-phase YAG crystallites were formed at 1200℃ without formation of any intermediate phase. Blue upconversion emission which centered at 487nm was detected under excitation of a 980nm diode laser. The blue emission was indicated to a two-photon processes and the upconversion mechanisms are determined to excited state absorption (ESA) of Tm~(3+) and cross relaxation (CR) between Yb~(3+) and Tm~(3+).
