Computational nano-materials design for circularly polarized luminescence in (Eu,Mg,O)-codoped GaN

We describe the production of circularly polarized luminescence from a luminescent center, which is generated by the spontaneous spinodal nano-decomposition of Eu, Mg, and O impurities doped into GaN. In this material, Zener's p-f exchange interaction creates an electronic structure suitable for the production of circularly polarized luminescence. Moreover, the P-7(2) ground state causes finite magnetic moments due to the reduction of the local symmetry around the Eu atom. These factors provide us with an expectation of not only circularly polarized luminescence but also potential control of the lifetime, color, and intensity, using the self-organized magnetic nano-structures. (C) 2014 The Japan Society of Applied Physics