Patent ID: 8129738
Filing Date: 2012-03-06
Classification: H01L,Y02E

Abstract:
1. An optoelectronic device comprising: at least one luminescent layer of dielectric material or semiconductor material, first and second electrodes sandwiching the at least one luminescent layer, wherein at least one of the electrodes is of semitransparent metal covering and separating said layer from air; and wherein the semitransparent metal electrode has two surfaces, each of which includes a periodic grating type microstructure, wherein the structure and positioning of the periodic microstructure is such that surface plasmon (SP) polariton modes are supported predominantly at an interface between the at least one luminescent layer and the metal electrode and are substantially Bragg scattered into light propagating out of the plane of the at least one luminescent layer and the metal electrode, and the optoelectronic light emitting device having a luminescence emission spectrum exhibiting: i) light from a first SP polariton mode which is associated with constructive interference corresponding to two Bragg scattering processes, and ii) light from a second SP polariton mode corresponding to one Bragg scattering process, the microstructures being out of phase by π radians or substantially π radians.