An electrophosphorescent organic light emitting concentrator

摘要

We demonstrate threefold directional light concentration from an organic light-emitting diode luminaire for use in spot lighting and other applications where high intensity illumination is required.The concentrating luminaire comprises four triangular,large-area green electrophosphorescent organic light emitting diodes(PHOLEDs)deposited on plastic substrates and assembled into a pyramidal structure with an open base that serves as the light exit aperture.The PHOLED surfaces are highly reflective to direct the emission from the devices to the aperture independent of the original emission position within the pyramid.The far-field intensity profile of the concentrator has a‘batwing’distribution that meets the requirements for general lighting for uniform illumination of planar surfaces.