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
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