【作者】 王晓芳； 邱若沂； 谢平波； 赵福利； 许宁生； 汪河洲；

【Author】 WANG Xiao-fang1,QIU Ruo-yi1,XIE Ping-bo2,ZHAO Fuli1,XU Ning-sheng1,WANG He-zhou 1(1.National Key Lab for Opto-electronic Material and Technology,School of Physics and Engineering,Zhongshan University,Guangzhou 510275,China;2.College of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)

【机构】 中山大学理工学院光电材料与技术国家重点实验室； 华南理工大学材料科学与工程学院；

【摘要】 以尿素为沉淀剂,采用均匀沉积法与硝酸锌反应获得了ZnO的纳米多晶颗粒。在飞秒脉冲激光激发下,观察到了ZnO纳米多晶颗粒的受激辐射现象,并从频域和时域两方面研究了ZnO纳米多晶的室温激射特性。氧化锌多晶颗粒中出现激子-激子散射导致的激射阈值为7.2 GW?cm?2,激射模式类似于F-P谐振腔模式,时域谱表现为寿命曲线中出现快速衰减成分。P带时间衰减具有对称结构,高斯拟合结果只有几个皮秒。更多还原

【Abstract】 The detailed room-temperature stimulated emission for nanosized polycrystalline ZnO prepared by homogenous precipitation method is investigated by time-resolved spectroscopy.The threshold excitation intensity is 7.2 GW ? cm?2and muti-mode lasing behavior is observed which is due to an exciton-exciton collision recombination.And the emission lifetime is drastically reduced.Time-resolved spectrum of P band suggest a Gaussianlike decay time with only a few tens of picoseconds,2 ps,which is the limit of streak camera time resolution.更多还原