Don’t worry no one will get mad for a bit off topic talk here.
And if we all consider just a bit on that it is not off topic at all…
Making our own leds out of mixture of recycled leds is an interesting idea and of course we would need to de dome them for scraping and phosphor collecting.
I like your idea and I hope you’ll manage to crack it out. It will sure be hard… For example here we have interesting pic from Djozz:
So it would be really interesting to know how to put phosphor back on scraped dedomed emitter. My guess is that it should be melted somehow and than poured thinly on emitter surface?…
For that some kind of mold should be used around emitter cube and then when we pour hot phosphor in it and then it should probably be evenly spread under pressure?(some kind of glass above mold which will push off excess phosphor away?)
The thing that I would be concerned in mentioned method is how to scrape and put phosphor back around those tiny + wires on lets say XP-G2 emitter scrape.
I have read this whole thread. Some parts multiple times and I’m still afraid to ruin my xpl2.2 leds. I might need to just such it up and try it like I did when doing my first xml2. My hesitation is that my results are never like those I see here even after practice and doing everything right. I’m using hot MEK. maybe it’s a weak batch?
Never mind Mitko. I found a way. And just for the record it doesn’t contain any of the chemicals you were using. Does this count as a perfect XHP35 dedome?
I’ll be honest with you. I’m not 100% there but as of now the best I have achieved is attempting to keep the phosphor completely intact. Even just the act of scraping the phosphor off damages the phosphor. I developed a way to do it without scraping.
Buuuut. I still have issues when it comes to transplanting it to the new die. If not perfect thermal quenching kicks in hard. Also on even my best transplant it doesn’t perform quite as good. Been trying to nail down why.
I’m about to do my first dedome. It will be an XM-L2 U2 1A. What would be the easiest method to do? I’d like it to be a bit warmer but hopefully without the green tint shift…
That dedomed XHP35 looks fantastic! I can't tell, but is the phosphor surface ok? Looks softened up or something, maybe a result of chemical treatments?
Hopefully it's not too labor intensive. Guess that's the ultimate thing we want to achieve - not just one offs that take hours of work, but a repeatable, predictable process. The process can take hours, but if we had to spend hours to do one with high risks, it's not very practical to make in batches.
I’m gunna be using MEK for a dedome but I just need something answered.
I see you all dedome on the board. Do you then reflow onto a fresh board afterwards or is an alcohol rinse sufficient!
Excellent Mitko, is the most XP cleanest eh seen, what recommendation can you give me to clean the remaining silicone surplus after putting it in gas to dedomar it? Eh used a toothpick but in several occasions eh cut the 2 wires that go to the phosphorus of the led. I have been told to try compressed air, but I doubt the out of the air will lift the phosphorus of the led. Thank you!
Mitko's chemical may not leave silicone residues - not sure. For me, I don't consider it necessary or worth the risk to get every trace of silicone off. I'll try to be sure loose pieces are removed, but I won't risk removing stuck silicone around the wires.
So… I wonder if anyone in the us or? Would be willing to purchase these items and then distribute them so they could be attainable and affordable on a small scale. I’m guessing there would be a lot of problems that would keep this from happening? Don’t know about shipping chemicals let alone multiple chemicals in the same shipment and … I’m sure this is not possible or yes?
Why bother with the IPA, though? MEK evaporates with 0 residue; should be able to even just dribble some MEK over any loose bits instead of using IPA. Even 95% IPA has that nasty remainder of water…
Had to look, you’re a Yooper, not overseas or anything, right?
Yesterday I stopped off at my local hole-in-the-wall hardware store to see if I can get some nice powerful solvent. Didn’t make my weekend trip where I could’ve stopped off at Lowes and pick up a gallon of MEK or xylene (the latter which can be used as an octane booster if yer so inclined), so didn’t want to wait another week…
Anyway, I go looking for “some nice powerful solvent that’d eat silicone… something like MEK, xylene, Stoddard’s solvent, whatever you got”. So, I get pointed to the little spray-bottles of “organic” this and “green” that, some crap that doesn’t even list the chemicals and probably doesn’t work that well anyway. Finally, I’m eyeballing the rest of the aisle, and right opposite it are maybe pint cans of both MEK and xylene! Sold! (Well, yah, probably 5× the price-per-gallon as the actual gallon, but…)
Anyway, if I can get it pretty easily in a hw store that carries maybe a half-dozen of each item because of limited space, you should be able to get some fairly easily, too.
“Big” stores like Lowes and Home Despot should have it for sure.
Thanks for the reply. I forgot an important part of my post. :person_facepalming: so, ya, I can get MEK. actually that’s what I’ve been using with ok results but nothing like this thrower potion I am reading about
Ya… da UP eh! How you know a’boot dem dare Yoopers?
Before anyone goes ordering anything, get the spellings right!! -phosphate vs -phosphite is a huge difference, and goggle doesn’t have a clue what’s “coresiline”. And I’m assuming benzene?
