{HEAD ~ The semiconductor active layer} includes {TAIL ~ activator ions} preferably selected from among Eu3+, Tb3+, Dy3+, Pr3+, Tm3+, and Mn2+ 
{ HEAD ~ The semiconductor active layer } includes { TAIL ~ activator ions } preferably selected from among Eu3 + , Tb3 + , Dy3 + , Pr3 + , Tm3 + , and Mn2 +
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