red leds
red leds
I am looking for some red light emitting diodes. I need a wavelength of 680nm can anyone guid me in the right direction.Thanks
AceeZ71
- Dave Dixon
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Re: red leds
Digi-Key, Mouser, Newark-In-One, Chicago Miniature, Ledtronics, Allied Electronics to name a few.
Can you be a little more specific? Surface mount? Through hole? Diffused or Clear, Round or Rectangular? Quantity required?
Good luck,
Dave
BTW 700nm seems more common..
Is that close enough???<p>[ December 02, 2004: Message edited by: Dave Dixon ]</p>
Can you be a little more specific? Surface mount? Through hole? Diffused or Clear, Round or Rectangular? Quantity required?
Good luck,
Dave
BTW 700nm seems more common..
Is that close enough???<p>[ December 02, 2004: Message edited by: Dave Dixon ]</p>
- Chris Smith
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Re: red leds
680 NM is closer to the IR spectrum, than the visual.
640 is the typical RED led.
640 is the typical RED led.
Re: red leds
I agree with the other posters, please be more specific. Particlularly, what is the application? With out this its basically impossible to help you other than pointing you to the obvious places.<p>Things to consider when selecting LEDs: color (wavelength), brightness (candella rating), power consumption (If, Vf too but red is usually about 2V), size and shape (many many many to choose from), mounting, viewing angle (lens focus), diffused/clear. did I forget anything? Needless to say, this is a lot more complex than one would think... And I haven't even broached driving methods.
Re: red leds
680nm is the only requirment that i have the other parameters could be anything you name it!!!! Again 680nm is all you need to know. Thanks
AceeZ71
- Chris Smith
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Re: red leds
What’s your plus or minus parameter?
- Chris Smith
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Re: red leds
Example <p>http://ledmuseum.home.att.net/ledred.htm<p>Unfortunately, LEDs have a wide spectral response, and its never exact. <p>For that you have to go Laser, and then the NMs are down to plus or minus two or three.
Re: red leds
Have you ever heard of a 680nm led by design anyway? Some said they read an articale about one but i have yet to find one myself.
AceeZ71
- dacflyer
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Re: red leds
Hmmm , wonders what they will be used for..
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Re: red leds
Some kind of colorimetry or absorbtion measurement would be my guess, but the OP seems unwilling to share more info. <p>Anyway, if he's that set on a particular wavelength he might be better off with a white LED and a precision color filter.<p> <blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by dacflyer:
Hmmm , wonders what they will be used for..<hr></blockquote>
Hmmm , wonders what they will be used for..<hr></blockquote>
Re: red leds
Thanks for the pointers guys i am going to do a little more research and i will get back to you all
AceeZ71
- Chris Smith
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- Joined: Tue Dec 04, 2001 1:01 am
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Re: red leds
You need to check out the specially or exoticly "doped" LEDS. <p>They add in small trace elements to increase the current flow, while either gaining a color shift, or out put intensity from this process. <p>The only places to look for these types of Led, or at least the info, is the universities [web pages] in China, Japan, India, Germany and the US. The Japs and Germans seem to have the most. <p>Phillips, Siemens [AG] group, and Hitachi might be a good starting point also?
Re: red leds
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>
...The Japs and Germans seem to have the most.
<hr></blockquote><p>sorry if I sound politically correct but could we not use racial slurs around here? even innocently. Some of us take offense to that term.<p>Phil
...The Japs and Germans seem to have the most.
<hr></blockquote><p>sorry if I sound politically correct but could we not use racial slurs around here? even innocently. Some of us take offense to that term.<p>Phil
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