Displaying items by tag: LEDhttp://sixsigma-tools.comTue, 31 May 2016 04:06:00 +0200Joomla! - Open Source Content Managementde-deBetter LEDs for surgeryhttp://sixsigma-tools.com/index.php/get-in-contact/item/1523-better-leds-for-surgeryhttp://sixsigma-tools.com/index.php/get-in-contact/item/1523-better-leds-for-surgeryBetter LEDs for surgery

Better LEDs for surgery

ID: F1512-09

Solid-state illumination utilizing LEDs has taken a major market share from standard fluorescent lighting in current years. LEDs provide higher power effectiveness and rapid start-up at a reasonable expense. However, poor color making resulting in a bluish production can be unpleasant, stressful and tiring for the eyes. Whenever used for medical lights, they can impair the capability to discern skin, structure and organ details, impacting the quality of surgery. This brand new task sought major improvements in LED-based lighting with a key target being the health sector. Scientists focused on increasing the efficiency, brightness and colour of a health luminaire (total illumination unit) while making sure that it can be disinfected. Efficiency depends on LED selection, colour mixing, the electronic driving circuitry and the thermal design. An advanced lighting system that combines light from various LED sources to create near-perfect color rendition across the complete noticeable range at extremely large efficiency has been created. Scientists showcased the technology in two demonstrators: a sleep mind light and an examination light. The sleep light has controllable color temperature to match the normal circadian rhythms of day and evening. It comes with a committed programmer, but can also be programmed and managed from a smartphone. The examination light is equipped with five color settings ranging from cold to hot white light. The high R9 (saturated red) colour rendition allows greater resolution of tissue distinctions for surgical procedures, whereas the cold white environment aids general examinations and is particularly good for visualising veins, needed for safe and painless drawing of blood. The technology will significantly enhance the competitive position of related small and medium-sized enterprises (SMEs).



  • LED
  • Surgery
  • color
  • Temperature
    grond@numberland.de (Administrator)Get in ContactWed, 23 Dec 2015 09:48:14 +0100
    Better materials for better LEDshttp://sixsigma-tools.com/index.php/get-in-contact/item/1505-better-materials-for-better-ledshttp://sixsigma-tools.com/index.php/get-in-contact/item/1505-better-materials-for-better-ledsBetter materials for better LEDs

    Better materials for better LEDs

    ID: F1510-01

    Keeping great promises for reduced energy usage and high conversion efficiencies, lighting fixtures with solid-state light sources have the possible to revolutionise the lighting industry. Additional improvements in light-emitting efficiency at high currents, with excellent color making at low expense would considerably speed up the widespread uptake of the technology. A new project is investigating the materials for these improved lighting products by developing new large-area semi-polar templates utilizing sapphire and silicon substrates. These semipolar templates help reduce the inbuilt electric fields in LEDs which affect their color security and effectiveness and supply a big area, low cost platform for the growth of the LED levels. The task is additionally making use of the indium aluminium gallium nitride (InAlGaN) material for the light-emitting layers, focusing on blue and yellow emission. A major challenge is patterning of the wafer to produce and coalesce semi-polar planes on the structured sapphire substrate. To this end, experts are assessing the impact of substrate fine orientation and growth parameters through X-ray measurements, luminescence and atomic-scale imaging. Metalorganic and hydride vapour phase epitaxy are used to develop levels on the substrates. The active light-emitting material comprises of quantum wells that have actually large optical efficiency and excellent color purity. Project partners used the HVPE technique to overgrow GaN on top of a GaN layer grown by MOVPE that had been at first prepared on pre-structured sapphire. InGaN layers had been then grown on semi-polar GaN templates with various growth conditions. Semi-polar InGaN structures with different thicknesses had been optimised, reaching large transformation light-emitting efficiencies in the blue and yellow spectra. A move from growing products on semi-polar substrates is assisting to overcome issues related to decrease in LED light-emitting efficiency. Changing present lighting technologies with solid-state lighting based on InGaN LEDs should enable a decrease in electrical energy by up to 5 %.



    • Energy
    • LED
    • Light
    • Source
    • Optics
      grond@numberland.de (Administrator)Get in ContactSat, 03 Oct 2015 22:07:04 +0200