α-TeO2∶Tm^(3＋),Ho^(3＋),Yb^(3＋)纳米材料的红绿蓝色上转换发光(英文)  

Controllable Red,Green and Blue Upconversion Luminescence of α-TeO_2∶Tm^(3+),Ho^(3+),Yb^(3+) Nanoparticles

作　　者：方增滨[1] 涂阳墨[1] 胡辉[1] 白燕[1] 

机构地区：[1]暨南大学化学系,广东广州510632

出　　处：《发光学报》2012年第10期1060-1067,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(21075053)资助项目

摘　　要：利用简单的水热合成法成功制备出α-TeO2∶Ho3+,Yb3+、α-TeO2∶Tm3+,Yb3+和α-TeO2∶Tm3+,Ho3+,Yb3+纳米材料,用980 nm的近红外光作为激发光源测定了样品的室温上转换发射光谱。结果表明:样品α-TeO2∶Ho3+,Yb3+分别发射绿光(545 nm)和红光(651 nm),分别对应于Ho3+离子的5S2→5I8和5F5→5I8能级跃迁。随着Yb3+的摩尔分数从5%增加到15%,样品在545 nm处的绿光强度明显变大,发光颜色由黄光向绿光转变。样品α-TeO2∶Tm3+,Yb3+在476 nm处发射出蓝光,对应于Tm3+离子的1G4→3H6能级跃迁,两个弱红光峰(651,675 nm)分别对应于Tm3+离子的1G4→3F4和3F2→3H6能级跃迁。随着Yb3+离子浓度的提高,蓝光与红光的相对强度也在显著提高。基于可调控性蓝光、绿光和红光的产生,α-TeO2∶Tm3+,Ho3+,Yb3+纳米材料能产生不同颜色的光,包括白光。α-TeO 2 ∶ Ho 3 ＋,Yb 3 ＋,α-TeO 2 ∶ Tm 3 ＋,Yb 3 ＋ and α-TeO 2 ∶ Tm 3 ＋,Ho 3 ＋,Yb 3 ＋ nanoparticles were prepared via a hydrothermal process.Under 980 nm excitation,α-TeO 2 ∶ Ho 3 ＋,Yb 3 ＋ nanoparticles showed green（545 nm） and red（651 nm） emission,which were attributed to the 5 S 2 → 5 I 8 and 5 F 5 → 5 I 8 transitions,respectively.The upconversion emission color changed markedly from yellow to green when the mole fraction of Yb 3 ＋ ions changed from 5% to 15% due to the green emission at 545 nm increased.The α-TeO 2 ∶ Tm 3 ＋,Yb 3 ＋ sample showed blue emission at 476 nm,which was attributed to the 1 G 4 → 3 H 6 transition,and two weak red（651,675 nm） emissions,which were attributed to the 1 G 4 → 3 F 4 and 3 F 2 → 3 H 6 transitions,respectively.The relative intensity ratio of the blue emission to the red emissions increased gradually with increasing Yb 3 ＋ concentration.Based on the generation of blue,green and red emissions,the α-TeO 2 ∶ Tm 3 ＋,Ho 3 ＋,Yb 3 ＋ nanoparticles could compose different color,including white,by controlling the doping concentration of rare earths in the α-TeO 2 nanoparticles.

关 键 词：上转换 白光 Tm^3+ Ho^3+ Yb^3+ α-TeO2纳米粒子 

分 类 号：O482.31[理学—固体物理]