LEDs and Lasers in Liquid Nitrogen!!
Like and subscribe. This is an archive channel, i'm not the owner of the content, check the link in the end. Here my labmates and I change the color of LEDs and lasers by freezing them with liquid nitrogen!!
This experiment works by utilizing liquid nitrogen to cool the semiconductor to -196ºC, robbing it of much of its thermal energy. This causes the "bandgap" energy to increase, thereby increasing the emitted photon energy and decreasing the emission wavelength.
Oodles of liquid nitrogen definitely is a perk of working in a NMR lab. :D
Regarding laser safety...This laser was run at just above its threshold current, putting it at 5mW of output power according to my own measurements on an OPHIR laser power meter. At 5mW, this laser is classified as FDA "eye safe" meaning that the blink reflex will prevent any damage from this laser, even from a direct hit. I ALWAYS wear laser goggles when working with lasers over 5mW!!
https://rumblevideoarchive.wordpress.com/
-
12:23
Styropyro Archive channel
1 year ago100% Invisible IR death ray laser!
313 -
LIVE
Steven Crowder
1 hour ago🔴 Iran's President Dead in Helicopter Crash: Everything You Need to Know
39,504 watching -
17:29
Breaking Points
1 hour agoBREAKING: Iran President DEAD In Helicopter Crash, What's Next?
23 -
LIVE
Rethinking the Dollar
12 minutes agoGold Surges 23% in 3 Months! Outperforming S&P 500
411 watching -
LIVE
Wendy Bell Radio
5 hours agoTrump's Play for New York
13,796 watching -
LIVE
Matt Kohrs
13 hours agoTrump BODIES Biden, The Fall of Memes & The Week Ahead || The MK Show
2,098 watching -
LIVE
jeffahern
1 hour agoMonday Madnes with Jeff Ahern (6AM Pacific)
1,174 watching -
29:57
Cody and Kellie
16 hours agoWhy a Truck Camper? Honest Six Month Review, Living in a Truck Camper
10.1K23 -
9:50
DepressedGinger
17 hours agoBiden *DENIES* polls, somehow thinks he's beating Trump
18.9K69 -
6:42
Vehicles Unlimited
20 hours ago2024 Chevrolet Trax Activ // The Best Compact SUV This Year?
25.8K6