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Science Technology

EL Material Can Generate Both Red and Green Light 21

Posted by timothy from the stop-no-go-no-stop dept.
Burstwave writes "According to this story, investigators at Philips, in collaboration with researchers at the University of Amsterdam, have developed the first electrochemiluminescent material that can generate both red and green light, an effect that depends on current flow. The full report will appear in Nature on Monday. This significant advance in ECL technology will lead to smaller and brighter full-color LED displays."
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EL Material Can Generate Both Red and Green Light More

EL Material Can Generate Both Red and Green Light

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  • Report from amsterdam. (Score:3, Funny)

    by Anonymous Coward on Saturday January 04, 2003 @05:19PM (#5015888)
    The scientists are reported to have said "whoa, look at the colours!!"

  • Spanish-speaking? (Score:3, Funny)

    by agdv ( 457752 ) on Saturday January 04, 2003 @05:29PM (#5015933)
    Ok, who else thought this was about something in Spanish, reading "el material"?

  • And As Usual... (Score:3)

    by Cyno01 ( 573917 ) <Cyno01@hotmail.com> on Saturday January 04, 2003 @05:36PM (#5015958) Homepage
    Blue lags behind. Whats with that? Blue LEDs, blue Lasers, Blue OLEDs, all took so much longer after green ones compared to green ones after red ones.

    • Re:And As Usual... (Score:2, Informative)

      by joebp ( 528430 )
      Blue wavelength < Red wavelength

      Shorter wavelengths are significantly harder to produce using *LED technology because the... [should have listened in Physics classes].

      • I think it was Max Planck who realized that the shorter the wavelength of the radiation, the more energy it takes to produce it. Combine that with the eye's reduced sensitivity to blue light (as compared to most other visible frequencies) and it follows that blue LEDs have to produce wicked-high photon energies to look comparable to their red and amber counterparts.
        Also, see this link [ledproductstore.com].
    • Blue EL have been out for years. But only as a single colour.

      The material in the article is capable of two colours, i.e. the news is the two colour part, not the colours themselves.
  • As long as they dont put them in traffic lights!

  • Yellow? (Score:5, Interesting)

    by cdaley ( 528940 ) <slashdot@notdoneyet.net> on Saturday January 04, 2003 @06:46PM (#5016272)
    THey say they can make screens better by having only 2 elements per pixel, since this serves the function of two.....but if they have the same element making either red or green, depending on current direction, how do they make yellow, which is a combination of red and green light?

    • Re:Yellow? (Score:3, Insightful)

      by jman11 ( 248563 )
      I'm no material scientist, but you could try putting an AC current through it at a rate that is higher than the eye could distinguish the two colours.

      Now, I'll add here that I am no expert on any of these things and this post is just me speaking through my arse.
      • I thought about that too, but what if the material is too slow to keep up? They must have solved this problem otherwise they wouldn't brag about this new material.
        • If the material is too slow to keep up, then we'd probably have problems using it in a screen at all. Very interesting question, though, and interesting solutions. I too, am speaking out of my arse, even in that limited first sentence of mine.
  • Alright! EL Christmas lights can't be far behind.

    --riney

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