Pink and phosphor purple diffused.

Joshua

Newly Enlightened
Joined
Sep 12, 2002
Messages
53
Location
LA.
Hey guys!
Thought I would tell you some of my experiments with ETG's Pink and Purple phosphor model 5mm LEDs. After I had gotten these little babys from Lloyd at ETG I was amazed at these babys and how stable the phosphor is. If you take a 400nm-405nm near UV LED to them, you can see the the inside of the die cup glow hot pink. And in a dark room they will continue to glow for about 2 seconds after you stop shining the UV LED down the barrel. But that was just a side note. Not what main point.
I am sure that some of you have noticed that the 15 degree viewing angle is a bit too narrow for such aplications as a power on indicator or anything required for a PCB purpose. And if you view the Pink or Purple LEDs from a distance you get this odd blue fuzzy ring that your eyes pick up. ( I'm gussing this because the the blue wavelength is going farther than the red or orange wavelengths because of the LED using a blue chip.) I found a way to reduce this affect on a large scale and actually make this LED represent a truer color. If you take a sandpaper like nailfile and take the tip of the nail file which has been worn out the most by use, you can, very carefully, rub the epoxy case untill it has a diffused case. This also has to be done when the LED is lit also so it it better to see to finish up and places that may be scrtched more than others. When you do this EVENLY an with a VERY fine nailfile, you get a factory looking difussed T1 5mm case. I lit up a purpe phosphor model next to another one I had which was a homemade diffused one, and not only was the color rendering better, but those annoying blue oter region beams were cut down DRAMATICLY! AND it gives you a MUCH geater viewing angle. I recently fixed a guys Ham radio AMP with this that had 3 old 1970s red LEDs in them as indicator lights. Then I fixed up his AMP and took out the old crappy 70s LED. And put the diffused Pink, Purple, and 405nm diffused one in there place. He went gaga after he saw it. Not only are they great looking and not blinding, but when he 'keys up' the 405nm UV lights up. The others stay on all the time. Just thought I pass that along to guys! Have a great day!
Joshua Fuller
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camisdad

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Aug 4, 2002
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123
HI Joshua - great tip and congrats on first post! I am definitely going to try this out. Best - Michel
 

Joshua

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Joined
Sep 12, 2002
Messages
53
Location
LA.
Thanks for the warm welcome Michel! I am so glad to be posting here now!
On a related note does anyone know where I can buy some other phospher purple LEDs, other than ETG? I collect these too and it would be great to get another model. Craig has one on the bottom of his purple violet page but got it from Ebay back in 2001 and was not sure who made it. If anyone knows where to find some non UV, purple phosphor LEDs please respond to this thread or e-mail me. Thanks!
-----Joshua-----
 

The_LED_Museum

*Retired*
Joined
Aug 12, 2000
Messages
19,414
Location
Federal Way WA. USA
Just a note... ETG now sells a DIFFUSED pink LED.
Part numb er is ETG-SAX440-45-D.
Color ranges from a slightly bluish or purplish or magenta-ish hot pink color at higher current, to a more mellow, less hot pink at lower current. Estimated usable viewing angle exceeds 45°.
Pictures as time permits.
 

Doug S

Flashlight Enthusiast
Joined
Jun 20, 2002
Messages
2,712
Location
Chickamauga Georgia
Originally posted by Joshua:
If anyone knows where to find some non UV, purple phosphor LEDs please respond to this thread or e-mail me. Thanks!
-----Joshua-----
<font size="2" face="Verdana, Arial">All Electronics
 

Joshua

Newly Enlightened
Joined
Sep 12, 2002
Messages
53
Location
LA.
Thanks for the link. Gotta check that one out. I wonder how close it is to ETGs model looks wise.
 

Joshua

Newly Enlightened
Joined
Sep 12, 2002
Messages
53
Location
LA.
Thanks Craig for the info. Now I got another LED on my 'to get list'. : )
 
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