I have seen in several publications that an extremely sharp/narrow photoluminescence peak is attributed to some defect such as Nitrogen interstitials. However, the peaks appear to be far too narrow to be defect related. My understanding is that carrier-lattice coupling should broaden defect related peaks which means sharp peaks are typically from intracenter transitions in something such as an Eu dopant. Are there any mechanisms or examples of where defect related photoluminescence peaks can appear as sharp as intracenter transitions?
Ma, C., Xiao, Z., Puretzky, A.A., Wang, H., Mohsin, A., Huang, J., Liang, L., Luo, Y., Lawrie, B.J., Gu, G. and Lu, W., 2020. Engineering Edge States of Graphene Nanoribbons for Narrow-Band Photoluminescence. ACS nano, 14(4), pp.5090-5098.
A defect can be as small as an isolated single atom. If it IS a single atom then it behaves as a matrix-isolated atom. Then the collisions that broaden the spectral lines in a gas of atoms are absent. If it is a hole then, below a certain size, it behaves like an isolated quantum dot or atom. In both cases the linewidth will be extremely sharp as there is no mechanism of energy transfer and lifetime is large.
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