Appication of crystallophysic principles to optoelectronic problems

Authors: Davydov V. N., Oleynik V. L.

Annotation: In the article we considered the problem of the efficiency of luminescence LED heterostructures with multiple quantum well (MQW) by eliminating (reorientation) of the vector of spontaneous polarization in InGaN/GaN crystals of 6mm point symmetry, which are used in optoelectronics for creating LEDs. We propose to use the principles of crystal physics, which are based on symmetry laws of crystalline solids and allow to predict the observability of physical properties at a given point symmetry. In theory we show that the application of constant magnetic field in certain crystallographic directions detaches vector of the spontaneous polarization from the main axis of symmetry, allowing an arbitrary orientation in the crystallophysical coordinates. Experimentally we detected the increase of emission power in LEDs to a few percent by means of the magnetic field action of a certain configuration and size on the crystal.

Keywords: point symmetry group, neumann principle, curie principle, led heterostructure, magnetic field, spontaneous polarization, piroelectric effect, piezoelectric effect