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Rare‐earth doped III‐N semiconductors have been studied for decades on account of their possible application in visible light‐emitting diodes (LED) with built‐in utility as red (e.g. Eu), green (Er) and blue (Tm) monochromatic sources (O'Donnell and Dierolf (eds.), Topics in Applied Physics, Vol. 124 (Springer, Dordrecht, 2010) [1]). However, to date, no commercial devices have been introduced on...
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