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Optical Properties of Single CdS Nanosheets
Heesuk Rho,Kyoung-Yeon Lee,Thang B. Hoang,Lyubov V. Titova,Ashu Mishra,Leigh M. Smith,Howard E. Jackson,Jan M. Yarrison-Rice,최영진,최경진,박재관 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We study the optical properties of single CdS nanosheets using micro-photoluminescence and time-resolved photoluminescence (PL) techniques. At low temperature, we observe high quantum efficiency and strongly polarized PL emission, indicating high-quality single-crystal nanosheet growth. Photoluminescence from A and B exciton states is observed with different spatial distributions, suggesting the existence of a variation in strain in the nanosheets. Time-resolved photoluminescence measurements show the exciton lifetime to be 230 ps, longer than that of the near-band-edge emission, but shorter than the lifetime of defect-related emission in single CdS nanowires.