LED to produce RF. Does it exist?

[neazoi]

Hello, this is a question that comes in mind when thinking about leds.
Why we do not use LEDs to produce RF as well? the lowst frequency is IR

 

[betwixt]

There is a HUGE jump in frequency between 'RF' and IR. The main problem though is an LED produces photons (light) which isn't much use in conventional circuits. Also, the main reason for using high frequency is to allow wider bandwidth transmissions and the junction capacitance of an LED is relatively high. This means it would take considerable electrical power to drive the junction and control the light output at high speed.

Brian.

 

[jeffrey samuel]

frequency gap is almost incompassible as of now

but future can't be said accurately if we make devices that can facilitate it then it may be possible in the future

but now there is very mild probability of this to happen

 

[dick_freebird]

Some of the first solid state oscillators were tunnel diodes.
But not LEDs.

To get a RF "photon", even if such a thing is possible, would
need so low a bandgap that the device would probably be
unrealizable or uselessly noisy (RF quantum energy less than
thermal energy anywhere north of absolute zero - LWIR
detectors need cryogenic cooling).

 

[jeffrey samuel]

Some of the first solid state oscillators were tunnel diodes.
But not LEDs.

To get a RF "photon", even if such a thing is possible, would
need so low a bandgap that the device would probably be
unrealizable or uselessly noisy (RF quantum energy less than
thermal energy anywhere north of absolute zero - LWIR
detectors need cryogenic cooling).

aka a feat as of date is impossible then my friend

 

[neazoi]

Ok, If I have understood well, the bandgap should be huge to produce RF, just like the bandgap is smaller when producing UV?
It would be interesting to see how future goes on these devices... already the first UV-C LEDs are made

 

[FvM]

Translating the characteristic of a LED "EM source" into RF domain, you have band pass noise with limited AM capability. Which purpose do you imagine for it? The idea seems to have no use at all.

 

[jeffrey samuel]

the draw backs here are more reaching than the advantages better not to try doing it now

the flaws to be rectified a large amount of power is lost that makes it more costlier the price factor also will be really high

 

[neazoi]

Translating the characteristic of a LED "EM source" into RF domain, you have band pass noise with limited AM capability. Which purpose do you imagine for it? The idea seems to have no use at all.

A quick think is making antennas producing long wavelengths with small physical size. Who knows what else. I would never say "no use at all" until one finds a use

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the draw backs here are more reaching than the advantages better not to try doing it now

the flaws to be rectified a large amount of power is lost that makes it more costlier the price factor also will be really high

Thank you I understand the obstacles now. Nevertheless back in 60s noone could think about a practical solid state laser or a UV led. We will see how the future goes
Thanks all for the help

 

[jeffrey samuel]

A quick think is making antennas producing long wavelengths with small physical size. Who knows what else. I would never say "no use at all" until one finds a use

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Thank you I understand the obstacles now. Nevertheless back in 60s noone could think about a practical solid state laser or a UV led. We will see how the future goes
Thanks all for the help

future is beyond us but we can just predict our near future that is the next 2 or 3 years

unless a more drastic change in system brought out the probability of achieving this is almost impossible

 

[FvM]

A quick think is making antennas producing long wavelengths with small physical size.

Wavelength matters for light emitting semiconductors, why shouldn't it matter for your hypothetical RF emitting devices?

 

[jeffrey samuel]

with out considering the wave length how will you tune your reciever then

 

[FvM]

I'm quite sure that wavelength is a fundamental property for transmission and reception of electromagnetical waves. The idea of "making antennas producing long wavelengths with small physical size" seems to ignore it however.