X-Ray IR Glasses!...NOT

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Well i dont know how but they use it as IR indictators.The remote had to be pointed right on the phosphor and in a darker room.
 
visible light has more energy than IR ? Where does the phosphor get the necessary energy from ? Is it a sort of cascade effect ?
 
[...] Up-conversion materials are a very rare class of inorganic crystals that can absorb multiple photons at a lower energy level and emit one photon at a higher energy level [...]
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As I assumed - sort of cascade effect ... great!
 
Hey _nox_ , I think the crystals you're talking about are known as NLO (Non-Linear Optic) crystals. They use them in laser systems to generate harmonics of laser wavelengths. For instance, the green laser pointers you can buy actually have a solid-state infrared laser diode operating at 808nm pumping a crystal of Nd:YV04 as the laser generator. Then they send the 1064nm IR beam produced through the NLO (usually made of a material called KTP). That doubles the frequency (halves the wavelength) to generate the green beam at 532nm. Here's a link to wiki regarding the Non-Linear Optics. Interesting stuff.
JB
 
I've heard somewhere that blue LEDs have been around as early as the mid 70s, I wonder if they were just IR LEDs with phosphors or harmonic crystals.
 
dknguyen said:
1. Don't post COMPLETELY unrelated questions on someone else's thread
2. Make your own posts for your own questions.
3. Do your own damn homework.
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ROFLMAO! This place has both ends of the spectrum: intelligent, insightful people and the completely cluless, helpless ones.
 
HiTech said:
ROFLMAO! This place has both ends of the spectrum: intelligent, insightful people and the completely cluless, helpless ones.
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Yes, I have also noticed.
Since school recently started again, this place is getting more of the latter.
Sometimes I help school kids.
 
I'll also help out some of the kids here as well..... that is by directing them to the "short bus".
 
Indeed! Very interesting! Thanks for this enlightenment!
 
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shortbus=
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