High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copper-doped ZnSe/ZnS quantum dots.
作者： Guichuan Xing , Wei Ji , Yuangang Zheng , Jackie Y. Ying
DOI: 10.1364/OE.16.005715
关键词: Quantum dot 、 Laser 、 Optics 、 Doping 、 Copper 、 Photoluminescence 、 Absorption spectroscopy 、 Zinc selenide 、 Materials science 、 Excitation 、 Optoelectronics
摘要: Three-photon absorption (3PA) and three-photon-excited photoluminescence (3PE-PL) of ZnSe/ZnS copper-doped ZnSe/ZnS core-shell quantum dots (QDs) in aqueous solutions have been unambiguously determined by Z-scan 3PE-PL measurements with 200- fs laser pulses at 1000 nm. The 3PA cross-section is as high 3.5 × 10-77 cm6 s2 photon-2 for 4.1 nm-sized, QDs, while their below-band-edge PL found to be nearly cubic dependent on the excitation intensity, efficiency enhanced ~ 20 fold compared undoped ZnSe/ZnS QDs.
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W. Z. Wu, Z. R. Zheng, W. L. Liu, J. P. Zhang, Y. X. Yan, Q. H. Jin, Y. Q. Yang, W. H. Su, Upconversion luminescence of CdTe nanocrystals by use of near-infrared femtosecond laser excitation Optics Letters. ,vol. 32, pp. 1174- 1176 ,(2007) , 10.1364/OL.32.001174
Jun He, Yingli Qu, Heping Li, Jun Mi, Wei Ji, Three-photon absorption in ZnO and ZnS crystals. Optics Express. ,vol. 13, pp. 9235- 9247 ,(2005) , 10.1364/OPEX.13.009235
Narayan Pradhan, David Goorskey, Jason Thessing, Xiaogang Peng, An alternative of CdSe nanocrystal emitters : Pure and tunable impurity emissions in znse nanocrystals Journal of the American Chemical Society. ,vol. 127, pp. 17586- 17587 ,(2005) , 10.1021/JA055557Z
Daniel R Larson, Warren R Zipfel, Rebecca M Williams, Stephen W Clark, Marcel P Bruchez, Frank W Wise, Watt W Webb, Water-Soluble Quantum Dots for Multiphoton Fluorescence Imaging in Vivo Science. ,vol. 300, pp. 1434- 1436 ,(2003) , 10.1126/SCIENCE.1083780
Marius A. Albota, Chris Xu, Watt W. Webb, Two-photon fluorescence excitation cross sections of biomolecular probes from 690 to 960 nm Applied Optics. ,vol. 37, pp. 7352- 7356 ,(1998) , 10.1364/AO.37.007352
H S Brandi, C B de Araujos, Multiphonon absorption coefficients in solids: a universal curve Journal of Physics C: Solid State Physics. ,vol. 16, pp. 5929- 5936 ,(1983) , 10.1088/0022-3719/16/30/022
Narayan Pradhan, David M. Battaglia, Yongcheng Liu, Xiaogang Peng, Efficient, stable, small, and water-soluble doped ZnSe nanocrystal emitters as non-cadmium biomedical labels. Nano Letters. ,vol. 7, pp. 312- 317 ,(2007) , 10.1021/NL062336Y
D. J. Norris, M. G. Bawendi, MEASUREMENT AND ASSIGNMENT OF THE SIZE-DEPENDENT OPTICAL SPECTRUM IN CDSE QUANTUM DOTS Physical Review B. ,vol. 53, pp. 16338- 16346 ,(1996) , 10.1103/PHYSREVB.53.16338
Jun He, Wei Ji, Jun Mi, Yuangang Zheng, Jackie Y. Ying, Three-photon absorption in water-soluble ZnS nanocrystals Applied Physics Letters. ,vol. 88, pp. 181114- ,(2006) , 10.1063/1.2198823
James W. M. Chon, Min Gu, Craig Bullen, Paul Mulvaney, Three photon excited band edge and trap emission of CdS semiconductor nanocrystals Applied Physics Letters. ,vol. 84, pp. 4472- 4474 ,(2004) , 10.1063/1.1755420