Random Lasing Action from Randomly Assembled ZnS Nanosheets
1 School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore
2 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 230031, Heifei, China
Nanoscale Research Letters 2010, 5:809-812 doi:10.1007/s11671-010-9563-8Published: 9 March 2010
Lasing characteristics of randomly assembled ZnS nanosheets are studied at room temperature. Under 266-nm optical excitation, sharp lasing peaks emitted at around 332 nm with a linewidth less than 0.4 nm are observed in all directions. In addition, the dependence of lasing threshold intensity with the excitation area is shown in good agreement with the random laser theory. Hence, it is verified that the lasing characteristics of randomly assembled ZnS nanosheets are attributed to coherent random lasing action.