High Brightness Full Color LEDs.

Photon-Recycling for High Brightness LEDs

humble status indicators for domestic and industrial appliances. However, in the last ten years, the emergence of blue and violet emitters from the development of GaN, AlGaN, and InGaN materials [1] and improvements in efficiencies have led to high brightness LEDs suitable for a range of indoor and outdoor applications [2]. These devices have a significant advantage compared to conventional lig...

High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System

Determining contrast sensitivity functions for monochromatic light emitted by high-brightness LEDs

Light-emitting diode (LED) technology is becoming the choice for many lighting applications that require monochromatic light. However, one potential problem with LED-based lighting systems is uneven luminance patterns. Having a uniform luminance distribution is more important in some applications. One example where LEDs are becoming a viable alternative and luminance uniformity is an important ...

Integrated Off-Line Ballast for High Brightness LEDs with Dimming Capability

This paper presents an off-line integrated full ballast to supply a 35 W assembly of Power LEDs. The proposed solution integrates an input PFC stage (a flyback converter operating in DCM) and a DC-DC output converter (a buck converter) into a single switch power stage, operating with peak current control. As it will be shown, this control scheme maintains the current through the load constant, ...

Color-saturated green-emitting QD-LEDs.

Semiconductor nanocrystals (NCs) or quantum dots (QDs) show great promise for use in QD-LED (quantum dot lightemitting device) displays, owing to their unique optical properties and the continual development of new core and core–shell structures to meet specific color needs. This in combination with the recent development of more efficient and saturated QD-LEDs as well as new QD-LED fabrication...