The University of New Mexico (UNM) has fabricated triangular-nanostripe core–shell semi-polar III–nitride light-emitting diodes (TLEDs) on c-plane sapphire [Ashwin K. Rishinaramangalam et al, Appl. Phys. Express, vol9, p032101, 2016]. The performance results are described as “preliminary”.  By using triangular nanostripes with semi-polar sidewalls, the UNM researchers hope to access the advantages for light-emission without the non-commercial costs of free-standing substrates and at a lower cost, which could accelerate commercial adoption.