LED - color & fabrication | Semiconductors | Physics | Khan Academy

Let's explore the fabrication considerations of making LEDs. We will also explore why LEDs are not made of silicon or germanium but of semiconductor compounds like GaAs, GaPh, GaN, GaAsPh, etc.
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Created by Mahesh Shenoy

[@jemsncrystals]

*these type of channels beed tobcome on top like 10 million. Not somone playing videogames. This channel is sooooo underrated thankyou so much*

[@shivambaghel7991]

Really explanation is too good I don't know why this channel is underrated thanks a lot ❤❤

[@yashwantsaini6028]

I am an electrical engineer.
I can surely say that, this type of explanation i never seen.
I knew the concepts but implementation..........

[@williamfame4261]

Very easy to understand, thanks for sharing this knowledge.

[@08athakwaninandish16]

इतने अच्छे विवरण के लिए शुक्रिया!

[@user-db4sv6fb9n]

What elements do we use to dope gallium arsenide,gallium phosphide & gallium Nitride Into p-type & n-type semiconductors

[@smartgamer4203]

Mind-blowing explanation sirr....

[@sfchannel3319]

No words! Fantastic explanation!!

[@querysnthoughts1518]

Thank you sir❤❤

[@shaikrafik6300]

U r superb sir... i love uu

[@KrrishNandrajog07]

Loved the last part 🙂🔥

[@gnanaprasuna8131]

Very well presented

[@syedaltaf109]

This is best lecture i have ever watched regarding led's

[@ayushbhalerao9980]

That was cool sir

[@mimomimo6994]

I am from ethiopia 🙏 for sharing knowledge. አመሰግናለሁ

[@roshinipalanisankar6656]

Is the color of light from LED dependent on the nature of gas like argon / neon ? It would be great if you could reply sir . Thanks for this great video as always.

[@shotoniphone13]

There are no gases in a LED.
The inert gases you are talking about in the bulb are true, there are gases in 'Filament bulbs' to reduce evaporation of the filament and prevent its oxidation.

[@vivekthumu8992]

@@shotoniphone13 Thanks sir

[@dr.devdeganeshn1162]

Excellent

[@vdevapriyavenkatesan5084]

Very great explanation. Thank u so much sir

[@parthivreddy7989]

Great explanation

[@Sylvanexo]

This is amazing. Thanks a lot

[@vroom2009]

I love you sir ❣️❣️

[@rayocaballo6122]

You are one fantastic teacher

[@s.3421]

Just luved it!!!! ❤❤

[@jubayerhasan3091]

This is so nice

[@shaikrafik6300]

Tq sir

[@rubabayesha6625]

Superb

[@khushisingh2163]

Thanks sir ☺️

[@sia7317]

Sir can you please do pyq as well❤️🥺

[@anandsp1179]

Awsome

[@lewtube6436]

What puzzles me is how you get a PN junction with a single material, that is to say, the mixture of group 13 and 15 elements. I am guessing this. That mixing groups 13 and 15 gives you both free electrons and holes, and thus a conducting material. So the result is not a diode, but a conductor in both directions. The free electrons then drop into the holes, and give off EM waves as they would at a PN junction. Anyone agree or disagree?

[@ShawnDypxz]

My question is: How the phosphor layer reflects yellow light when they are being bombarded by blue light? For eg, leaves appear green because other colored photons are absorbed by them but they reflect green. Please clarify. This is the biggest misunderstanding I have about light.

[@ShawnDypxz]

It absorbs the light from the blue LED and emits in a broad range from greenish to reddish, with most of its output in yellow. This yellow emission combined with the remaining blue emission gives the "white" light, which can be adjusted to color temperature as warm (yellowish) or cold (bluish) white.

[@adwaithjayasankar3985]

@@ShawnDypxz Did you just answer your own question
Also I thought chlorophyll gave leaves it's characteristic green color

[@RajuSharma-fz2tp]

On further increasing the current the intensity of the light reduces in led , why ?

[@amanbajracharya7403]

Increasing the current increases the temperature thus reducing the efficiency

[@NOOBgamer-dn9zl]

Why we need blue light just use yellow led and coat it with blue,
i.e just reverse coating and led

[@rbkstudios2923]

Why do the videos have no speed control these days
Can you please fix that

[@shotoniphone13]

You can control "playback speed" by clicking on the the three dots in top right corner

[@rbkstudios2923]

@@shotoniphone13 Yep
Seems like they finally have fixed that

[@mrvivek4746]

This is different from last video

[@vandanatripathi4828]

Can't we just put blue colour on a yellow led

[@tihomirraicevic4761]

How do you mean there was no blue leds before 2014 makes no sense to me cause there were obviously.

[@KhanAcademyIndiaEnglish]

No, apparently they invented it in the 90s but won the Noble prize for it in 2014.

[@manmohanbisht69]

But neither of them are semiconductor..

[@necbd8893]

Great explanation

[@runzit2007]

Excellent