High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copperdoped ZnSe/ZnS Quantum dots | Zendy

Guichuan Xing | Zendy; Wei Ji | Zendy; Yuangang Zheng | Zendy; Jackie Y. Ying | Zendy

Open Access

High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copperdoped ZnSe/ZnS Quantum dots

Author(s) -

Guichuan Xing,

Wei Ji,

Yuangang Zheng,

Jackie Y. Ying

Publication year - 2008

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.16.005715

Subject(s) - photoluminescence , quantum dot , materials science , absorption edge , optoelectronics , copper , absorption (acoustics) , excited state , doping , optics , excitation , laser , band gap , molecular physics , atomic physics , physics , quantum mechanics , metallurgy , composite material

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 x 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 approximately 20 fold compared to the undoped ZnSe/ZnS QDs.

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