Components for Optical Information Output

摘要

Properties influencing the external efficiency of light emitting diodes were investigated. Specifically, the diffusion technique, the diffusion depth, and the reflectivity of the contacts are causually related to low or high efficiency. Design and characteristics of high radiance emitters without heterostructure are described. Measurements, and in some cases calculations, of the heat conductance, switching times, efficiency, phase homogeneity, and linearity of the diodes are presented. The degradation of the different types of diodes is investigated. Results show that no single degradation mechanism for each type of diode can be identified. In application, monolithic integration of linear LED arrays (up to 60 elements) and discrete seven segment displays are characterized.