A single-tap concentric photogate pixel of 28 μm pitch is developed for application to time-of-flight (ToF) three dimension (3D) image sensors. The 198×108 ToF pixel array exhibits demodulation contrast higher than 50% and distance error less than 1%, over 1 to 7 m range using 20MHz modulation of 850 nm light emitting diode (LED) illumination.

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 s...

lectrophosphorescent copolymers have been synthesized by covalent bonding of a red-emitting osmium complex Os(bpftz), hich contains two 3-trifluoromethyl-5-(4-tert-butyl-2-pyridyl)triazolate (bpftz) cyclometalated ligands, into the backbone of a ipolar polyfluorene (PF) copolymer. Employing these copolymers, a highly efficient red polymer light-emitting diode has been ealised that has an extern...

This paper proposes a novel indoor positioning algorithm using visible light communications (VLC). The algorithm is implemented by preinstalled light-emitting diode illumination systems. It recovers the VLC channel features from illuminating visible light and estimates receiver locations by analytically solving the Lambertian transmission equation group. According to our research, the algorithm...

The results of studies the influence thicknesses electron-blocking, hole-conducting and recombination layers on luminance-voltage other electrophysical characteristics a multilayer light-emitting diode with an active layer based semiconductor quantum dots are presented. Optimized voltages determined to achieve maximum efficiency electroluminescence diode. Keywords: dots, diode, blocking layer.

A 'turn-on' fluorescent colorimetric device for Hg(2+) sensing was built using a dual light-emitting diode system. Fluorescence generated from a rhodamine derivative (RHD), an indicator for Hg(2+) sensing, was combined with a background red light, and the complex light was captured by a commercial charge coupled device camera or by the naked eye.

This thesis details the design, execution and evaluation of a new type of display technology, known as Display Blocks. Display Blocks are a response to two major limitations of current displays: visualization and interaction. Each device consist of six organic light emitting diode screens, arranged in a cubic form factor. I explore the possibilities that this type of display holds for data visu...

We have designed and fabricated two-color infrared light emitting diode (LED) emitting in the wavelength regions of 3–4 lm and 5–10 lm. The interband cascade (IC) LED device was grown on n-type GaSb substrate and has 30 cascaded stages for the long-wave infrared (LWIR) and 15 cascaded stages for the mid-wave infrared (MWIR) emission bands. The two active regions are separated by a 0.5 lm thick ...