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LUXLED (tm)  electro luminescence technique

The development of electro luminescence goes back to the year 1936, however, until the early sixties it did not exceed laboratory stadiums. Among others the general reason was that then people had the idea for the "electro luminescent surface lamp" to compete with the common bulb and its derivatives.

This idea was to fail especially because of the limited efficiency and the technological possibilities of those days.

Today the electro luminescence (EL) technique becomes more and more a supplement, in some cases an alternative, to the common light techniques. For applications which need to be illuminated by a shadowless, non dazzling, and homogenous light, often combined with the requests for minimal space, given complex shapes or outlines, cold illumination, limited power consumption, and may be insensitive to shock and temperature influences, the electro luminescence technique becomes the perfect choice.

Thus, for example EL devices are used for backlighting transparent films that may have any motives, logos, signs, or texts printed on.

electro luminescence cell

Basically, luminescence results from the characteristics of certain substances emitting absorbed energy (day-, UV-light, X-radiation). The stimulation of luminescence by electricity is called electro luminescence, which converts electrical energy into light. Substances used are fluorescent pigments, luminophores or phosphor compounds.

Using the so-called thick-film-technology, the pigments, binary compounds, are enclosed in certain organic, or ceramic, transparent media, which again are enclosed in structured electrodes - a transparent front electrode and a vacuum metallized rear electrode. Similar to the capacitor technology, the enclosed pigments can be described as the non-conductor of a capacitor - or in total - as a "light-capacitor".

life time

The life time of an EL cell in general depends on the following influences:
  • UV light
  • temperature
  • humidity
  • voltage
  • frequency
Influenced by these factors the cell's brightness will decrease more or less steadily, therefore the life time of an EL cell is generally defined by its half-life value, which again defines the time it takes for the brightness to decrease to 50% of its original value. Modern EL technologies allow half-life values between 5,000 to 10,000 hours, however, as stated above, it depends on the application respectively its operating and environmental conditions.

colours

LUXLED (tm) offers a wide range of colours according to the customers' demands. For example: white, yellow, green, blue-green, blue, violet, etc.

power supply unit

Adapted to the size of the related EL surface special power supply units have to be developed which have to convert any DC or AC primary voltage into AC current of 70 Veff to 140 Veff and 400 Hz to 800 Hz on the secondary voltage side. Under this conditions the brightness ranges between 60 cd/m² to 120 cd/m². The luminance of an EL is ruled by either the setting of the input voltage, which de- or increases brightness, or a change of frequency, which alters the colour - up to a certain extend, that is.

We at LUXLED (tm) have developed a number of power supply units adapted to different EL types and sizes and matching various input conditions.

amcon (tm)
C. I. Wittke gmbh phone: +49 7943 2023
D-74249 Jagsthausen fax: +49 7943 8021
Germany / Europe info@amcon-luxled.com


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URL: http://amcon-luxled.com/luxled/technic1.html
last modified on 17-Feb-2001