Suppressed blinking and auger recombination in near-infrared type-II InP/CdS nanocrystal quantum dots.
Suppressed blinking and auger recombination in near-infrared type-II InP/CdS nanocrystal quantum dots.
复制标题
在近红外II INP/CDS纳米晶量点中抑制眨眼和螺旋钻的重组。
DOI:
10.1021/nl302453x
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发表时间:
2012-11-14
期刊:
影响因子:
10.8
通讯作者:
Hollingsworth JA
中科院分区:
文献类型:
--
作者:
Dennis AM;Mangum BD;Piryatinski A;Park YS;Hannah DC;Casson JL;Williams DJ;Schaller RD;Htoon H;Hollingsworth JA
Non-blinking excitonic emission from near-infrared and type-II nanocrystal quantum dots (NQDs) is reported for the first time. To realize this unusual degree of stability at the single-dot level, novel InP/CdS core/shell NQDs were synthesized for a range of shell thicknesses (~1–11 monolayers of CdS). Ensemble spectroscopy measurements (photoluminescence peak position and radiative lifetimes) and electronic structure calculations established the transition from type-I to type-II band alignment in these heterostructured NQDs. More significantly, single-NQD studies revealed clear evidence for blinking suppression that was not strongly shell-thickness dependent, while photobleaching and biexciton lifetimes trended explicitly with extent of shelling. Specifically, very long biexciton lifetimes—up to >7 ns—were obtained for the thickest-shell structures, indicating dramatic suppression of non-radiative Auger recombination. This new system demonstrates that electronic structure and shell thickness can be employed together to effect control over key single-dot and ensemble NQD photophysical properties.
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影响因子:
17.1
作者:
Hamada, Morihiko;Nakanishi, Shunsuke;Biju, Vasudevanpillai
通讯作者:
Biju, Vasudevanpillai
影响因子:
15
作者:
Ivanov, Sergei A.;Piryatinski, Andrei;Klimov, Victor I.
通讯作者:
Klimov, Victor I.
影响因子:
10.8
作者:
Kuno, M;Fromm, DP;Nozik, AJ
通讯作者:
Nozik, AJ
影响因子:
64.8
作者:
Dickson, RM;Cubitt, AB;Moerner, WE
通讯作者:
Moerner, WE
影响因子:
8.6
作者:
Ryu, Euidock;Kim, Sungwoo;Kim, Sang-Wook
通讯作者:
Kim, Sang-Wook