Compact high-quality CdSe-CdS core-shell nanocrystals with narrow emission linewidths and suppressed blinking.
Compact high-quality CdSe-CdS core-shell nanocrystals with narrow emission linewidths and suppressed blinking.
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DOI：
10.1038/nmat3539
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发表时间：
2013-05
期刊：
影响因子：
41.2
通讯作者：
Bawendi MG
中科院分区：
文献类型：
--
作者：
Chen O;Zhao J;Chauhan VP;Cui J;Wong C;Harris DK;Wei H;Han HS;Fukumura D;Jain RK;Bawendi MG
高颗粒均匀性、高光致发光量子产率、窄且对称的发射光谱线形以及最小的单点发射间歇性（称为闪烁）已被认为是胶体量子点（QD）在几乎所有光学应用中成功使用的普遍要求。然而，合成同时满足所有这四个标准的样品已被证明具有挑战性。在这里，我们报告的合成这样的高品质的CdSe/CdS核/壳量子点在一个优化的过程中，保持缓慢的增长速度的壳通过使用辛烷乙撑和油酸镉作为前体。与以前的观察结果相比，单量子点闪烁显着抑制只有一个相对较薄的外壳。此外，我们证明了消除的合奏发光光暗化，这是一个内在的后果量子点闪烁统计老化。此外，与常规QD相比，这些新颖QD的小尺寸和高光致发光量子产率使它们成为上级体内成像剂。我们预计，这种新一代的量子点也将导致量子点在其他应用，如固态照明和照明的性能显着改善。
High particle uniformity, high photoluminescence quantum yields, narrow and symmetric emission spectral lineshapes and minimal single dot emission intermittency (known as blinking) have been recognized as universal requirements for the successful use of colloidal quantum dots (QDs) in nearly all optical applications. However, synthesizing samples that simultaneously meet all these four criteria has proven challenging. Here, we report the synthesis of such high-quality CdSe/CdS core/shell QDs in an optimized process which maintains a slow growth rate of the shell through the use of octanethiol and cadmium oleate as precursors. In contrast with previous observations, single-QD blinking is significantly suppressed with only a relatively thin shell. In addition, we demonstrate the elimination of the ensemble luminescence photodarkening that is an intrinsic consequence of QD blinking statistical aging. Furthermore, the small size and high photoluminescence quantum yields of these novel QDs render them superior in vivo imaging agents compared to conventional QDs. We anticipate that this new generation of QDs will also result in significant improvement in the performance of QDs in other applications such as solid-state lighting and illumination.
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