New white LED technology

LowBat

LowBat

Flashlight Enthusiast
Joined
Jan 4, 2005
Messages
2,527
Location
San Jose, CA
I thought it was the phosphor that changed a blue LED to emit white. Is this supposed to be a stand alone phosphor that emits white light?
 
Szemhazai

Szemhazai

Enlightened
Joined
Jan 1, 2006
Messages
835
Location
Wroclaw - Poland
I am not sure if it is something new... :thinking: After small research in google.
From http://www.physorg.com/news109848190.html :
The researchers report the first success in developing a new LED based on a new phosphor from semiconductor nanocrystals of cadmium sulfide mixed with manganese. It produces a stable shade of white light that remains constant over time and appears superior in overall performance in comparison to previous generations of white LEDs.

And here is link to the old patent filled more than 30 years ago :
http://www.freepatentsonline.com/3970582.html
Alpha barium zinc cadmium sulfide phosphors and method
New phosphors which may be activated to luminesce in the red to green portion of the spectrum have an alpha crystal structure isostructural with Ba.sub.2 MnS.sub.3 and the composition Ba.sub.2 Zn.sub.1.sub.-y Cd.sub.y S.sub.3 : A.sub.w.sup.. zZnS wherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1. Methods of making these phosphors are described.
 
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