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OLEDs May Generate Electricity

Posted by timothy on from the another-step-toward-off-grid-computing dept.

NewmansDaddy writes: "According to a PCMag article, 'When the OLEDs are working as a display, you apply electricity to the materials and they emit light. It turns out, however, that if you apply light to these devices, you can get them to produce electricity; in other words, they will run backward...'"

12 of 43 comments (clear)

  1. Renewable lighting? by darylp · · Score: 3, Interesting

    How well do these work when compared to traditional Solar Cell based components? With the addition of a few capacitors, it would be nice to have OLED lighting which would recharge during the day.

  2. finally by tps12 · · Score: 3, Funny

    The solar-powered flashlight is finally a reality.

    --

    Karma: Good (despite my invention of the Karma: sig)
  3. So??? by ka9dgx · · Score: 4, Informative
    LEDs are also photoelectric. I built a sensor with two of them, one as a photodiode. I did this 8 years ago, for fun while visiting my friend in Florida.

    --Mike--

  4. OLED's have signifigantly shorter lifespans by Hadlock · · Score: 4, Interesting

    LED's have supposedly 100,000 hours of use in them. of course, that's at about half intensity, and they still dim over time, and it's not been fully proved (LED's haven't been mainstream for 10 years really)....

    OLED's supposedly have somthing like a maximum of 30,000 hours of life.... would using them as primitive "solar cells" decrease their lifespan considerably? or is this a possible reason as to why they have such a short lifespan?

    on a somewhat completely unrelated topic, if increasing battery life is so damn important, why haven't they started including $3 radio shack 3v solar panels on everything in existance? or does the voltage/amperage have to be >= standard voltage of the battery? we have a 200mA trickle charger for our 12v deep cycle boat battery...

    would i be able to run/charge my m100 off a $3 3v solar cell? if i underclocked it? yes, i realize it's usually in my pocket....but it does sit underneath a hallogen light when i'm @ the computer...

    --
    moox. for a new generation.
    1. Re:OLED's have signifigantly shorter lifespans by Yarn · · Score: 3, Informative

      Lifetime is longer for solar cells as the electric fields are lower.

      I doubt that a $3 solar cell would provide enough current to run a palmtop. Find the wattage requirements, solar cells are approx £10 per watt.

      --
      -Yarn - Rio Karma: Excellent
  5. Ah, photonics by Yarn · · Score: 5, Informative

    A friend of mine has been working on organic solar cells for the last 4 months (MSc Project), he's hoping to reach 4% efficiency. Last time I spoke to him he was just about to put the ITO transparent contacts on, then test it with different wavelengths of light.

    The possibilities of making organic solar cells have been considered almost as long as organic LEDs have been known (one of my professors was in the Cambridge group who discovered the effect) but the efficiency will probably never be near that of good polycrystaline silica.

    To power my laptop I'd need half a metre square of high grade solar cell, about £500...

    --
    -Yarn - Rio Karma: Excellent
  6. not both by bearbones · · Score: 3, Insightful

    Read the article

    It says that to generate electricity it needs to be formulated differently.

    So you get a display or a solar cell, not both.

    But, maybe they can work on an new proccess that does both.

  7. Remind anyone else of... by Zarquon · · Score: 3, Informative

    Douglas-Martin sunscreen's from Heinlein's stories?
    IIRC, their functionality was based upon the firefly's light reaction.

    --
    "'Tis great confidence in a friend to tell him your faults, greater to tell him his." --Poor Richard's Almanac
  8. Fun with LEDs, not just OLEDs by JUSTONEMORELATTE · · Score: 3, Informative

    Take a yellow or green LED and shine your handy-dandy green laser pointer ($150 @ thinkgeek, support your sponsors!) directly into the lens. You get a little over 1VDC output from the LED, but only a few milliamps of current.
    I learned this trick from this page at the LED Museum. Theres a picture of this stunt there as well.

    This story seems newsworthy because it's nifty new OLED properties, but it's not really news that you can get an LED to rectify some electrons out of a light source.

  9. Bah humbug by BoBaBrain · · Score: 3, Insightful

    In the same way that a speaker will work as a microphone?

    Just because it's possible doesn't make it a good idea or even news...

    --
    I am a Karma Library.
  10. Bad Consequences? by SanLouBlues · · Score: 3, Insightful

    Hopefully they don't work too well. Otherwise a flash photograph could fry the display chip on OLED using pdas. I guess they might need to start surge supressing the display.

  11. photoelectric LEDs by ka9dgx · · Score: 4, Informative
    LEDs are clearly PhotoElectric. They do generate measureable (but only slightly useful) amounts of current in response to incident light.

    They are also spectrum sensitive, picking up only equal or higher energy photos. This can be verified with a microAmp meter, and a set of various high-brightness LEDs. You'll observe that a red LED will pick up red or shorter wavelengths, green only detects green and shorter wavelengths, etc.

    (Red has the longest wavelength (and smallest energy per photon) of visible light, violet is the shortest wavelength, and highest energy photon.) The high energy of blue is why it's been so hard to make a blue LED for years.

    Put them face to face, run the source LED at its rated current, and expect a few microAmps out of the other LED..

    --Mike--