An optical sensing approach based on light emitting diodes

Optical switching in midinfrared light-emitting diodes

Many types of optical switching devices have been studied and demonstrated using nonlinear effects in a variety of semiconductor materials and more recently in optical fibers. Light-controlled switches have a wide variety of potential applications in optical communications and high-speed optoelectronic systems. Optically controlled, fiber-based switches such as loop mirrors or soliton gates can...

ZnO - Based Light - Emitting Diodes

Optical Simulation of Top-emitting Organic Light Emitting Diodes

An optical model based on classical electrodyanmics has beeb exploited to simulate the optical effects for the top-emitting organic light emitting diodes. The optical performance of the devices can be obtained through calculation of the power density in each planar thin film. The far field emission profile and spectrum are derived base on this model. Predicated optical performance is compared w...

InP-Based Cylindrical Microcavity Light-Emitting Diodes

We have investigated the properties of InP-based microcavity light-emitting diodes ( = 1 6 m). Our objective was mainly to study the effects of lateral confinement of optical modes, which was achieved by the wet oxidation of double In0 52Al0 48As layers. The smallest devices had a cavity radius of 0.5 m, which becomes comparable to where is the effective refractive index of the photon emitting ...

10 GaN - based Light - Emitting Diodes

Light-emitting diodes (LEDs) offer several advantages over traditional light sources, such as smaller size, longer lifetime, higher efficiency, and greater mechanical ruggedness. Continuing developments in LED technology are producing devices with increased output power and efficiency as well as a wider range of colors [1]. Recent progress in the fabrication of GaN-based compound semiconductors...