金属纳米杂化物的异常光致发光猝灭,The Journal of Physical Chemistry C

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金属纳米杂化物的异常光致发光猝灭
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-04-10 , DOI: 10.1021/acs.jpcc.9b00352
Mahi R. Singh ₁ , Jiaohan Guo ₁ , Elisabetta Fanizza _{2,

3} , Madan Dubey ₄

Affiliation

我们已经开发出一种理论，用于由金属纳米颗粒和核-壳量子发射体的集合构成的纳米杂化物中的光致发光和吸收系数。核-壳量子发射器由量子发射器核和介电壳组成。当探测激光照射到金属纳米颗粒上时，会在集合体中感应出电偶极子。因此，这些偶极子通过偶极子-偶极子相互作用而相互作用。表面等离子体激元极化子也存在于金属纳米粒子中。量子发射器中的激子与这些表面等离激元极化子以及偶极-偶极子相互作用电场相互作用。使用量子力学密度矩阵方法，我们为光致发光猝灭和增强，非辐射衰减率，以及金属纳米粒子集合中量子发射体的吸收系数。我们证明了非辐射能量损失主要是由于激子与偶极-偶极相互作用所引起的，它是量子发射器中功率损失的原因。继而产生异常的光致发光增强和猝灭。我们已经将我们的理论与嵌入在Au纳米粒子集合中的核壳CdSe / ZnS量子点的实验数据进行了比较。在理论和实验之间找到了很好的一致性。我们表明，由于偶极-偶极相互作用，存在能量转移和吸收峰的增强。最后，我们发现嵌入在Au纳米粒子集合中的CdSe / ZnS量子点的光致发光光谱存在异常猝灭和增强。这种现象也主要是由于金纳米颗粒的集合体中的偶极-偶极相互作用引起的。这些是有趣的结果，可用于制造用于纳米医学和纳米技术的纳米传感器。

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Anomalous Photoluminescence Quenching in Metallic Nanohybrids

We have developed a theory for the photoluminescence and absorption coefficient in nanohybrids made of an ensemble of metallic nanoparticles and the core–shell quantum emitter. The core–shell quantum emitter is made of a quantum emitter core and a dielectric shell. When a probe laser light falls on metallic nanoparticles, electric dipoles are induced in the ensemble. Hence, these dipoles interact with each other via the dipole–dipole interaction. The surface plasmon polaritons are also present in metallic nanoparticles. Excitons in the quantum emitter interact with these surface plasmon polaritons and the dipole–dipole interaction electric fields. Using the quantum mechanical density matrix method, we have developed a theory for the photoluminescence quenching and enhancement, the nonradiative decay rate, and the absorption coefficient for the quantum emitter in the ensemble of metallic nanoparticles. We showed that the nonradiative energy loss is mainly due to the exciton coupling with the dipole–dipole interaction and it is responsible for the power loss in the quantum emitter. This in turn produces anomalous photoluminescence enhancement and quenching. We have compared our theory with experimental data of core–shell CdSe/ZnS quantum dots embedded in an ensemble of Au nanoparticles. A good agreement between theory and experiment is found. We showed that there are an energy shift and an enhancement in the absorption peak due to the dipole–dipole interaction. Finally, we showed that there is the anomalous quenching and enhancement in the photoluminescence spectrum of the CdSe/ZnS quantum dot embedded in the ensemble of Au nanoparticles. This phenomenon also occurs mainly due to the dipole–dipole interaction in the ensemble of Au nanoparticles. These are interesting results and can be used to fabricate nanosensors for applications in nanomedicine and nanotechnology.

更新日期：2019-04-10

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