大连民族学院学报
大連民族學院學報
대련민족학원학보
JOURNAL OF DALIAN UNIVERSITY FOR NATIONAL MINORITIES
2012年
3期
235-238
,共4页
曹保胜%魏清荷%李玲玲%何洋洋%董斌
曹保勝%魏清荷%李玲玲%何洋洋%董斌
조보성%위청하%리령령%하양양%동빈
Tm^3+-Yb^3+共掺杂Y2Ti2O7%溶胶-凝胶法%上转换发光
Tm^3+-Yb^3+共摻雜Y2Ti2O7%溶膠-凝膠法%上轉換髮光
Tm^3+-Yb^3+공참잡Y2Ti2O7%용효-응효법%상전환발광
Tm^3+ - Yb^3+ co - doped Y2Ti2O7%sol - gel method%up - conversion emission
采用溶胶-凝胶(Sol—gel)法制备1mol%Tm^3+、1mol%Tm^3+和10mol%Yb^3+共掺杂Y2Ti2O7粉末。Tm^3+掺杂Y2Ti2O7为Y2Ti2O7相和微量TiO2相的混合结构,Yb^3+共掺杂不改变Tm^3+掺杂Y2Ti2O7相结构。在976nm半导体激光器(LD)激发下,在430~500nm和620—750nm波长范围内获得了蓝色和红外上转换发光,分别对应于Tm^3+的^1G4→^3H6和^3H4→^3H6跃迁。Yb^3+共掺杂显著提高了Tm^3+掺杂Y2Ti2O7的上转换发光强度。研究表明:随着LD激发电压增大,Tm^3+-Yb^3+共掺杂Y2Ti2O7上转换发光强度逐渐增大,且上转换发光强度随LD激发功率增大呈现两阶段变化规律;随着温度升高,Tm^3+-Yb^3+共掺杂Y2Ti2O7上转换发光强度逐渐降低,这是由无辐射弛豫速率随着温度升高而增加所致。
採用溶膠-凝膠(Sol—gel)法製備1mol%Tm^3+、1mol%Tm^3+和10mol%Yb^3+共摻雜Y2Ti2O7粉末。Tm^3+摻雜Y2Ti2O7為Y2Ti2O7相和微量TiO2相的混閤結構,Yb^3+共摻雜不改變Tm^3+摻雜Y2Ti2O7相結構。在976nm半導體激光器(LD)激髮下,在430~500nm和620—750nm波長範圍內穫得瞭藍色和紅外上轉換髮光,分彆對應于Tm^3+的^1G4→^3H6和^3H4→^3H6躍遷。Yb^3+共摻雜顯著提高瞭Tm^3+摻雜Y2Ti2O7的上轉換髮光彊度。研究錶明:隨著LD激髮電壓增大,Tm^3+-Yb^3+共摻雜Y2Ti2O7上轉換髮光彊度逐漸增大,且上轉換髮光彊度隨LD激髮功率增大呈現兩階段變化規律;隨著溫度升高,Tm^3+-Yb^3+共摻雜Y2Ti2O7上轉換髮光彊度逐漸降低,這是由無輻射弛豫速率隨著溫度升高而增加所緻。
채용용효-응효(Sol—gel)법제비1mol%Tm^3+、1mol%Tm^3+화10mol%Yb^3+공참잡Y2Ti2O7분말。Tm^3+참잡Y2Ti2O7위Y2Ti2O7상화미량TiO2상적혼합결구,Yb^3+공참잡불개변Tm^3+참잡Y2Ti2O7상결구。재976nm반도체격광기(LD)격발하,재430~500nm화620—750nm파장범위내획득료람색화홍외상전환발광,분별대응우Tm^3+적^1G4→^3H6화^3H4→^3H6약천。Yb^3+공참잡현저제고료Tm^3+참잡Y2Ti2O7적상전환발광강도。연구표명:수착LD격발전압증대,Tm^3+-Yb^3+공참잡Y2Ti2O7상전환발광강도축점증대,차상전환발광강도수LD격발공솔증대정현량계단변화규률;수착온도승고,Tm^3+-Yb^3+공참잡Y2Ti2O7상전환발광강도축점강저,저시유무복사이예속솔수착온도승고이증가소치。
The 1 mol% Tin^3+, 1 mol% Tm^3+ and 10 tool% Yb^3+ co -doped Y2Ti2O7 powders were prepared by sol- gel method. The Tm^3+ doped Y2Ti2O7 was composed of mixture of Y2Ti2O7 and tiny TiO2 phases. Yb^3+ co - doping had no effect on the phase structure of Tm^3+ doped Y2Ti2O7. The blue and infrared up -conversion emissions in the wavelength range of 430 - 500 nm and 620 - 750 nm were detected by a 980 - nm semiconductor laser diode (LD) excitation, which corresponding to the ^1G4→^3H6 and ^3H4→^3H6 transitions of Tm^3+. The up -conversion emissions intensity of Tm^3+ doped Y2Ti2O7 powders was enhanced by Yb^3+ co -doping. The up -conversion emissions intensity of Tm^3+ -Yb^3+ co -doped Y2Ti2O7 increased gradually with increasing the excitation voltage of LD. The two step process was observed for the up - conversion emission intensity with increasing the excitation power of LD. The up - conversion emissions intensity of Tm^3+ -Yb^3+ co- doped Y2Ti2O7 was decreased with increasing the temperature, which caused by the increase of rate of nonradiative relaxation rate with temperature.