We demonstrate, experimentally and theoretically, that the photon emission from gold nanorods can be viewed as a Purcell effect enhanced radiative recombination of hot carriers. By correlating the single-particle photoluminescence spectra and quantum yields of gold nanorods measured for five different excitation wavelengths and varied excitation powers, we illustrate the effects of hot carrier distributions evolving through interband and intraband transitions and the photonic density of states on the nanorod photoluminescence. Our model, using only one fixed input parameter, describes quantitatively both emission from interband recombination and the main photoluminescence peak coinciding with the longitudinal surface plasmon resonance.

中文翻译：

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金纳米棒的光致发光：赛塞尔效应增强了热载体的发射

我们从实验和理论上证明，金纳米棒的光子发射可以看作是珀塞尔效应增强的热载流子的辐射重组。通过关联在五个不同的激发波长和变化的激发功率下测得的金纳米棒的单粒子光致发光光谱和量子产率，我们说明了通过带间和带内跃迁演化的热载流子分布以及状态的光子密度对纳米棒光致发光的影响。我们的模型仅使用一个固定的输入参数，定量描述了带间重组的发射以及与纵向表面等离子体激元共振相吻合的主光致发光峰。