Old 10-20-2011, 05:38 AM #1
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Default laser pointer turned on LEDs while it was pointed at them

okay so i was bored and decided to point my laser (1000w 447nm) at an LED flashlight, i always wondered what would happen but was afraid that the laser would burn out the LED or something. I tried it and when the laser got closer to the LED i could see the light turning higher until it was fully on when the laser shined on it. I took the batteries out and the same effect happened, and was just wondered if anyone had an explanation for this? thanks



Last edited by petters; 10-20-2011 at 05:41 AM.
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Old 10-20-2011, 05:41 AM #2
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Default Re: laser pointer turned on LEDs while it was pointed at them

What you are seeing is the fluorescence of the phosphor in the white LED. Remember, white LEDs are just blue LEDs with a phosphor coating to make an even spectrum of light. When you shine your blue laser on the LED, you are exciting the phosphor in a similar way that will appear to make the LED turn on. Remember, however, that this process is nowhere near 100% efficient, so you must be careful to not shine the laser on the LED for too long or you will burn the LED out. On a side note, I remember FireMyLaser has a video of a blue laser burning out an LED.
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Old 10-21-2011, 06:05 AM #3
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Default Re: laser pointer turned on LEDs while it was pointed at them

i have learned something new today that i will probably never forget, thanks
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Old 10-21-2011, 03:00 PM #4
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Default Re: laser pointer turned on LEDs while it was pointed at them

You can make red leds look like they are on bu shining 1mW red laser on them. I like it very much ..
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Old 10-26-2011, 09:52 PM #5
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Default Re: laser pointer turned on LEDs while it was pointed at them

LEDs can work backwards too, just not very efficiently. light in = current out.
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