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Gagliano, L. (author), Kruijsse, M. (author), Schefold, J. D.D. (author), Belabbes, A. (author), Verheijen, M.P.A.M. (author), Meuret, S. (author), Kölling, S. (author), Polman, A. (author), Bechstedt, F. (author), Haverkort, J. E.M. (author), Bakkers, E.P.A.M. (author)Direct band gap III-V semiconductors, emitting efficiently in the amber-green region of the visible spectrum, are still missing, causing loss in efficiency in light emitting diodes operating in this region, a phenomenon known as the "green gap". Novel geometries and crystal symmetries however show strong promise in overcoming this limit. Here...journal article 2018