Synthesis of highly luminescent wurtzite CdSe/CdS giant-shell nanocrystals using a fast continuous injection route

被引:82
作者
Christodoulou, S. [1 ]
Vaccaro, G. [2 ]
Pinchetti, V. [2 ]
De Donato, F. [1 ]
Grim, J. Q. [1 ]
Casu, A. [1 ]
Genovese, A. [1 ]
Vicidomini, G. [1 ]
Diaspro, A. [1 ]
Brovelli, S. [2 ]
Manna, L. [1 ]
Moreels, I. [1 ]
机构
[1] Ist Italiano Tecnol, IT-16163 Genoa, Italy
[2] Univ Milano Bicocca, Dipartimento Sci Mat, IT-20125 Milan, Italy
关键词
AMPLIFIED SPONTANEOUS EMISSION; COLLOIDAL QUANTUM DOTS; LIGHT-EMITTING-DIODES; IN-BULK NANOCRYSTALS; QUASI-TYPE-II; AUGER RECOMBINATION; SEEDED GROWTH; NANOROD HETEROSTRUCTURES; ELECTRONIC-STRUCTURE; EXCITON DYNAMICS;
D O I
10.1039/c4tc00280f
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We synthesized CdSe/CdS giant-shell nanocrystals, with a CdSecore diameter between 2.8 nm and 5.5 nm, and a CdS shell thickness of up to 7-8 nm (equivalent to about 20 monolayers of CdS). Both the core and shell have a wurtzite crystal structure, yielding epitaxial growth of the shell and nearly defect-free crystals. As a result, the photoluminescence (PL) quantum efficiency (QE) is as high as 90%. Quantitative PL measurements at various excitation wavelengths allow us to separate the nonradiative decay into contributions from interface and surface trapping, giving us pathways for future optimization of the structure. In addition, the NCs do not blink, and the giant shell and concurring strong electron delocalization efficiently suppress Auger recombination, yielding a biexciton lifetime of about 15 ns. The corresponding biexciton PL QE equals 11% in 5.5/18.1 nm CdSe/CdS. Variable-temperature time-resolved PL and PL under magnetic fields further reveal that the emission at cryogenic temperature originates from a negative trion-state, in agreement with other CdSe/CdS giant-shell systems reported in the literature.
引用
收藏
页码:3439 / 3447
页数:9
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