low voltage LED...

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https://www.photonicsonline.com/doc/solving-the-mystery-of-ultralow-voltage-leds-0001?vm_tId=2432568&vm_nId=74070&user=e390bfd9-8068-4614-b36c-19ba190f3646&gdpr=0&vm_alias=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&utm_source=mkt_PHOTO&utm_medium=email&utm_campaign=PHOTO_07-13-2022&utm_term=e390bfd9-8068-4614-b36c-19ba190f3646&utm_content=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&mkt_tok=MDc1LU5WQy0wODYAAAGFllmkmkM7HPaz47kleFiOxZq7XKM-EQEROtCQcwmSHeQ2L31lEIiEsDc5LqR_-vzAd874yAhEo1XFBRqT_6qifkf_w9p7Y1PkOe8gYNpaOoH-iA

Wow, light emission at 36% of bandgap voltage.

I have speculated here about that, how low a current and voltage can
make light. I should have run that experiment.
 
jlarkin@highlandsniptechnology.com Wrote in message:r
> https://www.photonicsonline.com/doc/solving-the-mystery-of-ultralow-voltage-leds-0001?vm_tId=2432568&vm_nId=74070&user=e390bfd9-8068-4614-b36c-19ba190f3646&gdpr=0&vm_alias=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&utm_source=mkt_PHOTO&utm_medium=email&utm_campaign=PHOTO_07-13-2022&utm_term=e390bfd9-8068-4614-b36c-19ba190f3646&utm_content=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&mkt_tok=MDc1LU5WQy0wODYAAAGFllmkmkM7HPaz47kleFiOxZq7XKM-EQEROtCQcwmSHeQ2L31lEIiEsDc5LqR_-vzAd874yAhEo1XFBRqT_6qifkf_w9p7Y1PkOe8gYNpaOoH-iAWow, light emission at 36% of bandgap voltage.I have speculated here about that, how low a current and voltage canmake light. I should have run that experiment.

Let\'s. Have come a long way. Today\'s LEDs at 5ma are insane in
brightness.

Cheers
--


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On Wed, 13 Jul 2022 14:44:00 -0400 (EDT), Martin Rid
<martin_riddle@verison.net> wrote:

jlarkin@highlandsniptechnology.com Wrote in message:r
https://www.photonicsonline.com/doc/solving-the-mystery-of-ultralow-voltage-leds-0001?vm_tId=2432568&vm_nId=74070&user=e390bfd9-8068-4614-b36c-19ba190f3646&gdpr=0&vm_alias=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&utm_source=mkt_PHOTO&utm_medium=email&utm_campaign=PHOTO_07-13-2022&utm_term=e390bfd9-8068-4614-b36c-19ba190f3646&utm_content=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&mkt_tok=MDc1LU5WQy0wODYAAAGFllmkmkM7HPaz47kleFiOxZq7XKM-EQEROtCQcwmSHeQ2L31lEIiEsDc5LqR_-vzAd874yAhEo1XFBRqT_6qifkf_w9p7Y1PkOe8gYNpaOoH-iAWow, light emission at 36% of bandgap voltage.I have speculated here about that, how low a current and voltage canmake light. I should have run that experiment.

Let\'s. Have come a long way. Today\'s LEDs at 5ma are insane in
brightness.

Cheers
Click to expand...

A decent LED is visible in room light at 1 uA. I have seen a green LED
at 1 nA. I didn\'t measure the voltage.

One could drive an LED with a square wave and detect with a PMT, do a
lockin thing to get the statistics down to sub-photon resolution.

Below bandgap emission voltage is interesting physics. If the energy
is electrical+thermal, does an emitted photon make the chip colder?

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon
 
On Wed, 13 Jul 2022 15:27:28 -0700, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Wed, 13 Jul 2022 14:44:00 -0400 (EDT), Martin Rid
martin_riddle@verison.net> wrote:

jlarkin@highlandsniptechnology.com Wrote in message:r
https://www.photonicsonline.com/doc/solving-the-mystery-of-ultralow-voltage-leds-0001?vm_tId=2432568&vm_nId=74070&user=e390bfd9-8068-4614-b36c-19ba190f3646&gdpr=0&vm_alias=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&utm_source=mkt_PHOTO&utm_medium=email&utm_campaign=PHOTO_07-13-2022&utm_term=e390bfd9-8068-4614-b36c-19ba190f3646&utm_content=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&mkt_tok=MDc1LU5WQy0wODYAAAGFllmkmkM7HPaz47kleFiOxZq7XKM-EQEROtCQcwmSHeQ2L31lEIiEsDc5LqR_-vzAd874yAhEo1XFBRqT_6qifkf_w9p7Y1PkOe8gYNpaOoH-iAWow, light emission at 36% of bandgap voltage.I have speculated here about that, how low a current and voltage canmake light. I should have run that experiment.

Let\'s. Have come a long way. Today\'s LEDs at 5ma are insane in
brightness.

Cheers

A decent LED is visible in room light at 1 uA. I have seen a green LED
at 1 nA. I didn\'t measure the voltage.

One could drive an LED with a square wave and detect with a PMT, do a
lockin thing to get the statistics down to sub-photon resolution.

Below bandgap emission voltage is interesting physics. If the energy
is electrical+thermal, does an emitted photon make the chip colder?
Click to expand...

So, what voltage is 36% of bandgap voltage ? Or, what is the
comparative bandgap voltage ?

We use some LEDs running at around 300 nA

boB
 
On 2022-07-13, John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Wed, 13 Jul 2022 14:44:00 -0400 (EDT), Martin Rid
martin_riddle@verison.net> wrote:

jlarkin@highlandsniptechnology.com Wrote in message:r
https://www.photonicsonline.com/doc/solving-the-mystery-of-ultralow-voltage-leds-0001?vm_tId=2432568&vm_nId=74070&user=e390bfd9-8068-4614-b36c-19ba190f3646&gdpr=0&vm_alias=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&utm_source=mkt_PHOTO&utm_medium=email&utm_campaign=PHOTO_07-13-2022&utm_term=e390bfd9-8068-4614-b36c-19ba190f3646&utm_content=Solving%20The%20Mystery%20Of%20Ultralow-Voltage%20LEDs&mkt_tok=MDc1LU5WQy0wODYAAAGFllmkmkM7HPaz47kleFiOxZq7XKM-EQEROtCQcwmSHeQ2L31lEIiEsDc5LqR_-vzAd874yAhEo1XFBRqT_6qifkf_w9p7Y1PkOe8gYNpaOoH-iAWow, light emission at 36% of bandgap voltage.I have speculated here about that, how low a current and voltage canmake light. I should have run that experiment.

Let\'s. Have come a long way. Today\'s LEDs at 5ma are insane in
brightness.

Cheers

A decent LED is visible in room light at 1 uA. I have seen a green LED
at 1 nA. I didn\'t measure the voltage.

One could drive an LED with a square wave and detect with a PMT, do a
lockin thing to get the statistics down to sub-photon resolution.

Below bandgap emission voltage is interesting physics. If the energy
is electrical+thermal, does an emitted photon make the chip colder?
Click to expand...

That depends on how efficient the laser is.



--
Jasen.
 
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