The possibility of mechanism i) is underlined by the fact that interband emission of smooth gold layers is known to have notoriously low PLQYs (around 10 -10 ) 1,32 while PLQYs in the order of 10 -5 were reported for the emission from gold nanoparticles. The in-creased PLQY is commonly assigned to plasmon enhancement. We determined the PLQY for the emission from the AuNF film in Figure Figure , as well (see SI for details). The value of 3 • 10 -5 , agrees well with these reports of enhanced PL. Hence, one might conclude that the interband PL spectrally overlapping with LSPR is simply five orders of magnitude stronger than the PL without plasmon enhancement.