I was surfing for info on Apple's new tablet and found a reference to OLEDs and ...
>And you didn't have a clue what they were, right?
|Uh ... right.
But, since curiosity is my forte, I looked about and larned that OLEDs can be used in a neat variety of ways:
- Generate a display that you can fold up and stick in your pocket.
- Paste to a wall, like wall paper ... and they can display moving images.
- Provide bendable and very thin PC monitors.
- Folding newspapers ... with a PC brain.
- Make lighting fixtures that ...
>Wait! What's OLED mean?
I though you'd never ask.
Remember that a Light Emitting Diode (LED) is a material that emits light when a voltage is applied.
Remember, too, that a source of voltage has two polarities: A negative cathode which ejects electrons and a positive anode which sucks up electrons.
Here's what I larned.
- There are organic (carbon-based) molecules (like polyaniline), that have the property that
- You apply a voltage across a layer of molecules.
- Electrons get dragged out of the atoms.
- They leave a "hole".
- If you allow the electrons to plop back into the holes, light is emitted.
- Various organic molecules provide various frequencies of visible light.
>And emit light!
- In OLEDs, there are (typically) two layers: Emmisive & Conductive.
- The Emmisive layer is supplied with electrons by a Cathode.
- The Anode sucks electrons from the Conductive layer, leaving holes.
- Electrons in the Emmisive layer are attracted to the Anode and travel across the Emmisive/Conductive boundary.
- They drop into the holes in the Conductive layer and ...
You got it.
However, I think the holes in the Conductive layer actually migrate to the Emmisive layer and inkjet technology can be used to deposit OLED material and ...
>So why are you writing about this stuff? Isn't it explained elsewhere? Can't I just google?
Uh ... yes. That's where I get it, but I read stuff like:
"polyaniline (PANI) and Indium/tin oxide (ITO) as the transparent anode of a polymer light emitting diode with poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene), (MEH-PPV), as the active layer"
And the diagrams are too complicated for me ... my eyes glaze over,
so I'm hoping to understand just enough without overtaxing these grey cells.
>That'll be difficult.