Let's Make Robots!

i dont know what this LED is ... any ideas ?

ok i have a few of these LEDs and i dont know what they are for i think they might be IR LED, i have tried putting a power source through them from 3-9V and it does nothing. any ideas at all i have about 500 of these my friend gave me and not a clue what they do... 

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*Dark Emitting Diodes

if you put 9 volts through that LED it is probably not an LED anymore because it has leaked its magic smoke

It is a 3mm version of the phototransistor.

yes i think this might be thank you, i couldnt tell from the hand writing on that piece of paper. 

 

thank you tired my phone on a tv remote, then tired it on the LED nothing isnt IR then 

Did you try looking at them using a camera when they are powered on ? If they are IR they will glow a purple whiteish colour. Use the camera on your phone and test with a TV remote (some cameras might have filters that block out IR light).  

Try hooking them up and look at them via a digital camera, if they are IR you will see the light. You really should have a resistor in series to limit the current.

Sorry didn't see your post before posting.