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Topic: BLUE led TO wHITE? (Read 1 time) previous topic - next topic

alah

Hi ALL; I have a bunch of blue LEDs which I would prefer to turn white . Possible?
Thanks, Alberto.

GrooveFlotilla

Some people are like Slinkies.

Not really good for anything, but they bring a smile to your face when pushed down the stairs.

larryd

You want to take a manufactured blue LED and remanufacture it into a white LED?


Google phosphorus coating white LED.





No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

PaulRB

#3
Mar 09, 2018, 11:13 pm Last Edit: Mar 09, 2018, 11:21 pm by PaulRB
@larryd, you're explaining too well. The OP won't be able to understand!
Hi ALL; I have a bunch of blue LEDs which I would prefer to turn white . Possible?
Thanks, Alberto.
Fish, banana, Wednesday. I hope that makes things suitably un-clear for you.

(Oops. I shouldn't have mentioned the bananas)

GrooveFlotilla

#4
Mar 10, 2018, 12:09 am Last Edit: Mar 10, 2018, 12:10 am by GrooveFlotilla
@larryd, you're explaining too well. The OP won't be able to understand!Fish, banana, Wednesday.
sp. "Forceps, banana, Wednesday, "

Sheesh, some people.
Some people are like Slinkies.

Not really good for anything, but they bring a smile to your face when pushed down the stairs.

INTP

Sell blue LEDs, use money to buy white LEDs?

Qdeathstar

or buy red and green leds and turn them all on...
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

INTP

I think with enough current, a white light will appear when the leads start to arc. Assuming nothing else in the system starts making white light or smoke or an orangish plasma like substance.

ChrisTenone

Hi Alberto, the first answer was the best one - the answer is no, you cannot turn a blue LED white (Larryd's remanufacturing scheme not-with-standing - that would work, but ... it would be somewhat complicated.) You can get a 3 color LED, which has red, green and blue LEDs in a single package. Then you can make it blue by energizing only the blue portion, or white by turning them all on. Google "tricolor led".
What, I need to say something else too?

larryd

No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

ChrisTenone

Now I want a brown LED.
What, I need to say something else too?

Grumpy_Mike

Now I want a brown LED.
Yes, you can't even make brown with an RGB LED.

6v6gt

#12
Mar 11, 2018, 09:16 pm Last Edit: Mar 11, 2018, 09:21 pm by 6v6gt
I solve all these problems by buying assortment kits where possible. Only specialist items are bought separately. This applies to resistors, variable resistors, capacitors, leds, general purpose transistors, nuts, bolts duPont connectors, etc. etc.
So, for example, instead of buying separate leds, I'd get this.
My local supplier cannot even send me one led for the price that I pay for a 300 piece assortment kit. The disadvantage is that I have to wait 2 or 3 weeks if I order from China.

alah

Understood; just thought that someone knew about a paper filter, paint, whatever. THANKs.

Grumpy_Mike

It's physics, you can use a blue filter on a white LED because white light contains all wavelengths of light and a filter can remove specific wavelengths. Where as a blue LED only contains blue light and to make white light you also need red and green light.

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