ns脉冲激光诱导制备铬掺杂ZnSe纳米粒子独特的生长以及光学特性  

Unique Growth and Optical Behaviors of Chromium Doped ZnSe Nanoparticles Induced by Ns Laser Pulse

作　　者：易家玉[1] 冯国英[1] 杨超[1] 张弘[1] 姚轲[1] 周寿桓[1,2] 

机构地区：[1]四川大学电子信息学院,四川成都610065 [2]华北光电技术研究所,北京100015

出　　处：《纳米科技》2014年第5期37-42,共6页

摘　　要：在液相环境中，利用纳秒（ns）脉冲激光器轰击消融铬掺杂ZnSe（Cr^2＋：ZnSe）微米颗粒，制备出Cr^2＋：ZnSe纳米粒子，扫描电镜以及X射线衍射检测，结果显示，制备所得的粒子为平均尺寸为50nm的ZnSe闪锌矿结构纳米粒子。基于Cr^2＋：ZnSe纳米粒子，观察到中心波长为2180nm、阈值为0．4mJ／pulse的随机激光效应。相比于Cr^2＋：ZnSe晶体激光器，纳米粒子随机激光的中心波长发生了约170nm的蓝移，Cr^2＋：ZnSe纳米粒子的光致发光寿命也比Cr^2＋：ZnSe晶体要短。Synthesized chromium doped ZnSe nanocrystalline particles （Cr^2＋： ZnSe NCPs） by using nanosecond pulsed laser ablation of polyerystalline Cr^2＋： ZnSe micron-sized powder in liquid environment. The scanning electron micrseope and X-ray diffraction results revealed that the products were ZnSe cubic sphalerite structure with an average size around 60nm. Based on the Cr^2＋： ZnSe nanoparticles, typical random laser emissions centering at 2175 nm with a threshold of 0.4 m J/pulse were observed. Compared to the Cr^2＋： ZnSe bulk laser, the central wavelength showed about 175nm blue-shift. The photoluminescence lifetime of Cr^2＋： ZnSe NCPs was shorter than that of Cr^2＋： ZnSe bulk.

关 键 词：Cr^2+:ZnSe 随机激光 纳米材料 中红外激光 

分 类 号：TB33[一般工业技术—材料科学与工程]