ZrO_2∶Er^(3+),Yb^(3+)纳米晶的制备及Er^(3+)离子能级在晶体场中的分裂  

Preparation of ZrO_2∶Er^(3+), Yb^(3+) Nanocrystals and Split of Er^(3+) Energy Level in Crystalline Field

作　　者：贾若琨[1] 刘艳梅[1] 和东亮[1] 吕强[1] 单桂晔[1] 刘兆阅[1] 白玉白[1] 李铁津 

机构地区：[1]吉林大学化学学院,长春130023

出　　处：《高等学校化学学报》2004年第7期1306-1309,MJ04,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 0 73 0 16;60 2 710 2 0 )资助 .

摘　　要：采用 1 ,3 -丁二醇低热结晶法制备了 Zr O2 ∶ Er3+ ,Yb3+ 纳米晶 .常温下 ,用 980 nm的红外激光激发可以观察到很强的 Zr O2 ∶ Er3+ ,Yb3+ 纳米晶红光发射 ,用荧光光谱仪记录了该上转换光谱 .X射线粉末衍射( XRD)结果表明 ,Zr O2 ∶ Er3+ ,Yb3+纳米晶属于立方晶系 .研究了纳米晶的上转换发光机理 ,根据晶体场理论对 Er3+ 的 2个上转换能级进行了 Stark分裂计算 ,对 2个能级之间的谱线进行了归属 ,进一步证实了980 nm激发 Er3+离子的上转换经历两个过程 :一是连续吸收 2个 980 nm光子的过程 ,二是吸收 980 nm光子 ,电子转移到亚稳态能级后 ,再吸收 980The ZrO 2∶Er 3+, Yb 3+ nanocrystals were prepared by low temperature crystallizing in 1,3-butadinol. Red upconversion emission at 660 nm was observed from ZrO 2∶Er 3+, Yb 3+ nanocrystals with 980 nm excitation. The X-ray diffraction patterns confirm that the nanocrystals are cubic. The mechanism of nanocrystals upconvertion was studied. The Stark splits of the two excited states of Er 3+ were calculated based on the theory of crystallization. The results confirm that the upconverted mechanisms in the ZrO 2∶Er 3+, Yb 3+ nanocrystals are due to the two processes, one is a consecutive absorption of two 980 nm photons process, and the other process is that electrons transfer to substeady states after absorption of 980 nm photons, then absorb 980 nm photons.

关 键 词：上转换发光材料 丁二醇低热结晶法 纳米晶 氧化锆 铒 镱 制备 能级分裂 

分 类 号：TB383[一般工业技术—材料科学与工程] TN104.3[电子电信—物理电子学]