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|Title:||High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copper-doped ZnSe/ZnS quantum dots|
|Source:||Xing, G.,Ji, W.,Zheng, Y.,Ying, J.Y. (2008-04-14). High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copper-doped ZnSe/ZnS quantum dots. Optics Express 16 (8) : 5710-5715. ScholarBank@NUS Repository.|
|Abstract:||Three-photon absorption (3PA) and three-photon-excited photoluminescence (3PE-PL) of ZnSe/ZnS and copper-doped ZnSe/ZnS core-shell quantum dots (QDs) in aqueous solutions have been unambiguously determined by Z-scan and 3PE-PL measurements with 200-fs laser pulses at 1000 nm. The 3PA cross-section is as high as 3.5 × 10-77 cm6 s2 photon -2 for 4.1 nm-sized, copper-doped ZnSe/ZnS QDs, while their below-band-edge PL is found to be nearly cubic dependent on the excitation intensity, with efficiency enhanced by ∼20 fold compared to the undoped ZnSe/ZnS QDs. © 2008 Optical Society of America.|
|Source Title:||Optics Express|
|Appears in Collections:||Staff Publications|
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