Photoluminescence properties of CdSe/ZnS/TOPO nanocrystals in full-and half-microcavity structures
Photoluminescence properties of CdSe/ZnS/TOPO nanocrystals in full-and half-microcavity structures
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全微腔和半微腔结构中CdSe/ZnS/TOPO纳米晶的光致发光特性
DOI：
10.1002/pssc.201000526
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Yuki Obara and Toshiro Tani
中科院分区：
文献类型：
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作者：
Masaru Oda;Hiroyuki Kazita;Yuki Obara and Toshiro Tani
我们报告了最近关于 CdSe/ZnS/TOPO 纳米晶体 (NC) 在由顶部和底部两个金属 (Ag) 镜组成的平面全微腔以及类似结构但没有顶部镜（即半微腔）中的光致发光 (PL) 特性的研究。测量了 PL 光谱和 PL 衰减曲线的角度依赖性，以研究微腔中光物质耦合引起的 PL 变化。获得的结果表明，PL 动力学根据微腔结构而发生巨大变化。在全微腔中，PL发射以特定角度定向，并且其衰减时间缩短，这两者都可以用所谓的珀塞尔效应来描述，即NC中光子模式与受限激子之间的相互作用。对于半微腔，反常PL带出现在与受限激子相关的主PL带的低能量侧。反常PL的起源将被解释为由于半微腔结构中的特定光子模式与与表面态相关的激子之间的相互作用。 （© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
We report a recent study on photoluminescence (PL) properties of CdSe/ZnS/TOPO nanocrystals (NCs) in a planar full microcavity composed of top and bottom two metal (Ag) mirrors, and also in a similar structure but without top mirror, i.e. half‐microcavity, respectively. Angular‐dependencies of PL spectra and PL decay curves have been measured to investigate PL modifications due to light‐matter coupling in the microcavities. Obtained results indicate that PL dynamics are drastically changed depending on the microcavity structures. In the full‐microcavity, PL emission is directed at particular angles and its decay‐time is shortened, both of which can be described in terms of so‐called Purcell effect, i.e. the interaction between photon‐modes and confined excitons in the NCs. As for the half‐microcavity, anomalous PL band appears at low energy side of a main PL band associated with the confined excitons. The origin of the anomalous PL will be interpreted as due to the interaction between specific photon‐modes in the half‐microcavity structure and excitons associated with surface states. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)