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Old 04-04-2017, 01:46 AM #1
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Default raw led die

hey everyone, im looking for a supplier for bare LED dies (dice?) a strange request, i know.

obviously, as a home gamer, i dont need 50,000 a month. and i need more than one or two, so requesting samples is out.

specifically i am looking for infrared GaAs chemistry. roughly the ones used in the 5mm size. i had no luck with hours of filtering and different phrasing on alibaba.

the other option i have been considering is to buy a cheap lot off fleabay, mount them carefully, and dissolve the resin to harvest the die. a considerable amount of research indicated methylethyl ketone soak for about a week might do the trick, but i dont want to get into anything more toxic.


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Old 04-04-2017, 02:34 AM #2
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Default Re: raw led die

Curious as to why you need bare LED dies?
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Old 04-04-2017, 02:53 AM #3
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Default Re: raw led die

Yes, i knew it would come up, and you're all going to laugh. I want to use them as solar panels of sorts for a wearable. Surprisingly, they put out a fair voltage, but not so much current in sunlight.
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Old 04-04-2017, 02:55 AM #4
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Default Re: raw led die

Same question as Diachi---why?

Why so lazy? Google "bare led die" you will get thousands of possilbe suppliers. Here are two.

See: White LED-Chips LIGHT AVENUE

Digi-Key sells them--See https://www.electronicsweekly.com/ne...sites-2015-03/
"As part of its plan to to support prototype and production order quantities the online distributor will work with die processing firm Minco Technology Labs to offer semiconductor bare die products in minimum waffle pack quantities of 25 pieces online."
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Old 04-04-2017, 02:56 AM #5
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Default Re: raw led die

Now you've done it, here comes the why use and LED, use something designed to convert sunlight into DC power...
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Old 04-04-2017, 03:19 AM #6
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Default Re: raw led die

I contacted minco, who is now owned by another company, and they told me they no longer supply to non business individuals. I thought i hit the jackpot, because they are located here in my hometown.

Ill use a solar panel, if soneone can find me a mono cell small enough for my application, or a supplier for the GaAs cells that nasa uses. You know, the ones that'll cost me an arm and first born child.
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Old 04-04-2017, 03:30 AM #7
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Default Re: raw led die

What is the largest size you can use?
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

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Old 04-04-2017, 03:43 AM #8
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Default Re: raw led die

1mm square is the largest i want to go, thats leaving enough room for me.
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Old 04-04-2017, 03:45 AM #9
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Default Re: raw led die

Wearable --meaning what?

That you can't find anything to suit your application tells you what?
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Old 04-04-2017, 03:55 AM #10
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Default Re: raw led die

Guess I can't understand why so small, not sure what you want this to go into, but if you wanted to share more detail, you probably would have by now. I found a small device which can be used as a solar cell at this URL, seems plenty small enough to me.

https://www.sparkfun.com/products/9541
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 04-04-2017, 10:45 AM #11
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Default Re: raw led die

Thanks Alaskan. Ill look into photodiodes a bit more. When i was messing with the leds, they produced triple that voltage, and almost the same current. With the active area being, a 10th that size?

Encap, man. I dont know if i pissed you off at some point, or what. If i did, im sorry. I posted to the forum for help. I understand the premise of this idea is out there, but the ridicule you're giving me is unreal. I'm not lazy. I have been googling this specific topic for a few weeks now. I have been on this specific project, on and off for 2 years.

This site used to be so much more. I understand there's kids on here now, noobies coming in and not even making an attempt at looking through the forum. But, damn, you know. This is a pretty out there question.I asked for help. If you dont have an answer for me, dont reply. Thats fine to do.
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Old 04-04-2017, 11:33 AM #12
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Default Re: raw led die

i will be testing diodes in bright sunlight now to see what they do, see what you did!
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 04-04-2017, 02:43 PM #13
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Default Re: raw led die

There are very small LED packages out there.
This one is 0.65mm X 0.35mm. Less than the
1mm square area you were looking for....

https://www.digikey.ca/product-detai...7-1-ND/5848474

Took like 10 seconds to hunt it down..


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Old 04-04-2017, 02:57 PM #14
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Default Re: raw led die

Yeah i was looking at those 0201 leds. The problem is the die is physically smaller. And if i had the die from a 5mm led, it would be bigger.
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Old 04-04-2017, 03:05 PM #15
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Default Re: raw led die

Then go to the next larger footprint or larger.
If you go to raw dies then you will need equipment
to attach connections to the dies.

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Old 04-04-2017, 03:33 PM #16
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Default Re: raw led die

Ill look back over the data sheets and see if the die is on there.

I recall reading an article a couple years ago, linked off this forum, of a guy that did some home die wire bonding. I remember he burned his first die, and used, i believe pure indium for the second. Since these dies (dice?) Are only collecting, there wont be power dissipation or heating to worry about
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