Electroluminescent Devices – From an Industrial Perspective

what are electroluminescent lamps - Linepro Controls Pvt Ltd

What is Electroluminescence?

Electroluminescence is the Optical and Electrical phenomenon wherein a material transmits light when current flows through it. This phenomenon is completely unique in relation to the emission of light from bulbs and other light producing gadgets. Electroluminescence occurs because of the radiative recombination of electrons and holes in a semi-conductor material. The excited electrons then, at that point, create Photons which show up as light. LEDs and Phosphor displays are common examples of electroluminescent lighting.

In LED, the electrons and Holes are isolated by a doping material to form a p-n junction. In this way, LEDs are commonly known as Semiconductor Electroluminescent or EL Devices. However, the high energy electrons are accelerated by a strong electric field to deliver light in Phosphor displays.

Design of EL Device

Electroluminescent gadgets or EL Lamps are made of thin film of organic or inorganic material containing semiconductor and a material called Dopant to give color tone. The various materials used to make electroluminescent gadgets incorporate Zinc Sulfide doped with Copper or Silver, Blue diamond doped with boron, Gallium Arsenide, Gallium Nitride and so on. The Zinc Manganese material produces yellow orange color tone. These organic and inorganic materials might be utilized as powder as on account of lighting gadgets or as thin films in display gadgets.

The EL lamp has the light radiating material encased between two electrodes. One electrode is transparent to permit the light to go through it, in and out. Glass electrode covered with Indium oxide or Tin oxide is normally utilized as the front transparent terminal. The back electrode is normally covered with a reflective metal.

Uses of EL lighting

electroluminescent for cars
Emerald Blue EL effects on car dashboard

Electroluminescent light is currently utilized in automotive dash board, CD players and so forth. Powder phosphor board is utilized as the backlight illumination in Laptops, PC monitor screen and in LCD. The advantage of electroluminescent light is low energy utilization and great lighting display.

industrial electroluminescent
EL Lamp Panel in application for a Graphic Overlay Keypad

The utilization of electroluminescent lighting is widely used in backlighting illumination. It is utilized as backlight for liquid crystal display (LCD), keypads illumination, watches, handheld remote controlled gadgets, thermostats, clocks, calculators and cell phones among others. The upside of EL is that it consumes very little power in comparison to the LEDs. Accordingly, it is utilized generally in handheld gadgets where batteries are utilized to drive up the gadget. It is typically used to illuminate displays or keypads in dark rooms and spaces for limited instance of time. Additionally, it helps to light up a space uniformly and looks great when compared with LEDs. EL lights are available in different shades of color and the normal ones are greenish and pale blue, and largely depend upon the materials that are chosen.

Electroluminescence Detectors

Electroluminescence detectors have become more and more popular with the advancement of low cost CCD silicon arrays. They are identical to the ones used in digital cameras but with optimization for sensitivity in the near-infrared and cooled to reduce the thermal noise. Similar to the digital cameras, there are detectors with multiple mega pixels resolution of 2048 * 4096 pixels which enables high resolution images for the entire modules. One of the significant drawbacks of a silicon detector is that they have a poor response beyond 1000 nm level because of the low absorption coefficient of silicon. An alternative detector to silicone is the InGaAs photodiodes array having higher response over the 1000 to 1300 nm wavelength range thus enabling a much faster data acquisition rate but with a considerably higher cost. Resolution typically is in the sub-megapixel range with 640 × 512 pixels as the most common.

Properties of EL Devices

  • In contrast to filament lights or LEDs, in EL Devices, the brightness of the emitting surface seems something very similar from all points of view.
  • EL light isn’t directional and could not be measured like the light sources measured in lumens.
  • The EL light is homogenous and can be recognized well by a normal human sight.
  • The Monochromatic light from these gadgets has exceptionally low bandwidth and is noticeable from significant distance. The intensity of light transmitted from the EL source relies upon the voltage and the frequency that are applied to it. As the voltage and frequency increase, the light output increases proportionally. Notwithstanding, one should abide by the standard voltage and frequency that are to be utilized or probably the lifespan of the light will reduce drastically.

The Linepro EL Advantage

Linepro produces electroluminescent lamps. Linepro offer the following advantages:

  • El lamps can be used to illuminate the most complex aircrafts and other instruments, displays (including LCD panel) as well as keypads.
  • EL lamps are flexible and flat.
  • Light sources that cool; EL bulbs produce virtually zero heat.
  • Variety of colors available to fulfill specific color specifications.
  • EL lamps offer efficient, economical lighting due to the low energy consumption.
  • Linepro can manage both large and small quantities.
  • The complete systems approach. Linepro can supply the essential power sources needed for EL lamps.
  • The highest level of quality control; Linepro tests every lamp separately to ensure that it meets the requirements for performance and compliance.

Integrating Electroluminescence Lamp into your device entails a number of risks, but no more than you could expect from any other kind of backlighting. With an expert like Linepro on your side, you can avoid technical glitches and reach new potentials in terms of product enhancement. Start by sharing your project requirements and we will start guiding you upon the best EL Lamp solutions suitable for your application!

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