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Is the LED drop voltage difference between colors linked to the different wavelength energy?
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To me appears that LEDs that emitt light with less energy (e.g. IR and red) have less voltage forward drop than the ones with more energy associated to their wavelength (such as blue or UV).
That would be fascinating.
Is this a true correlation or is it dependent solely on the technology available?
led
asked 48 mins ago
valerio_new
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To me appears that LEDs that emitt light with less energy (e.g. IR and red) have less voltage forward drop than the ones with more energy associated to their wavelength (such as blue or UV).
That would be fascinating.
Is this a true correlation or is it dependent solely on the technology available?
led
asked 48 mins ago
valerio_new
33311
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
To me appears that LEDs that emitt light with less energy (e.g. IR and red) have less voltage forward drop than the ones with more energy associated to their wavelength (such as blue or UV).
That would be fascinating.
Is this a true correlation or is it dependent solely on the technology available?
led
asked 48 mins ago
valerio_new
33311
To me appears that LEDs that emitt light with less energy (e.g. IR and red) have less voltage forward drop than the ones with more energy associated to their wavelength (such as blue or UV).
That would be fascinating.
Is this a true correlation or is it dependent solely on the technology available?
led
led
asked 48 mins ago
valerio_new
33311
asked 48 mins ago
valerio_new
33311
asked 48 mins ago
valerio_new
33311
asked 48 mins ago
valerio_new
33311
asked 48 mins ago
valerio_new
33311
33311
add a comment |Â
add a comment |Â
2 Answers
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It's true (with small exceptions).
The energy needed to create a photon of any particular wavelength sets the absolute minimum Vf that a diode requires when running. In addition to that, there are further small voltage drops dependent on the particular technology.
IIRC, yellow and green require a very similar voltage, which is probably technology dependent. But red and IR do require much less, and blue and UV much more, due to photon energy requirement.
answered 35 mins ago
Neil_UK
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The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 360 to 950 nm. Each wavelength range is made from a specific semiconductor material family, regardless of the manufacturer. Source: Photonics - Light-Emitting Diodes: A Primer.
The article is worth a read.
Figure 1. The LED color guide from Lumex gives a good overview of the various LED types, chemistry and wavelengths. For some explanation, if required, see LEDs and colour (mine).
Like all diodes (the D of LED), a certain voltage is required for the electrons to get them across the depletion region. The electron releases its energy as a photon. Your hunch is correct and the bandgap of the material gives the characteristic wavelength. Higher bandgaps give shorter wavelengths.
Figure 2. The forward voltage drops vary with current. What is an LED?.
This data for this graph was taken from various datasheets and carefully plotted. The LEDs, however, were from different manufacturers and there is some variation in the forward voltages. The white LEDs, for example, are usually blue with phosphors added so the white curve should overlap the blue curve. I'm still working on this.
answered 26 mins ago
Transistor
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
It's true (with small exceptions).
The energy needed to create a photon of any particular wavelength sets the absolute minimum Vf that a diode requires when running. In addition to that, there are further small voltage drops dependent on the particular technology.
IIRC, yellow and green require a very similar voltage, which is probably technology dependent. But red and IR do require much less, and blue and UV much more, due to photon energy requirement.
answered 35 mins ago
Neil_UK
69.5k272152
add a comment |Â
up vote
2
down vote
It's true (with small exceptions).
The energy needed to create a photon of any particular wavelength sets the absolute minimum Vf that a diode requires when running. In addition to that, there are further small voltage drops dependent on the particular technology.
IIRC, yellow and green require a very similar voltage, which is probably technology dependent. But red and IR do require much less, and blue and UV much more, due to photon energy requirement.
answered 35 mins ago
Neil_UK
69.5k272152
add a comment |Â
up vote
2
down vote
up vote
2
down vote
It's true (with small exceptions).
The energy needed to create a photon of any particular wavelength sets the absolute minimum Vf that a diode requires when running. In addition to that, there are further small voltage drops dependent on the particular technology.
IIRC, yellow and green require a very similar voltage, which is probably technology dependent. But red and IR do require much less, and blue and UV much more, due to photon energy requirement.
answered 35 mins ago
Neil_UK
69.5k272152
It's true (with small exceptions).
The energy needed to create a photon of any particular wavelength sets the absolute minimum Vf that a diode requires when running. In addition to that, there are further small voltage drops dependent on the particular technology.
IIRC, yellow and green require a very similar voltage, which is probably technology dependent. But red and IR do require much less, and blue and UV much more, due to photon energy requirement.
answered 35 mins ago
Neil_UK
69.5k272152
answered 35 mins ago
Neil_UK
69.5k272152
answered 35 mins ago
Neil_UK
69.5k272152
answered 35 mins ago
Neil_UK
69.5k272152
69.5k272152
add a comment |Â
add a comment |Â
up vote
2
down vote
The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 360 to 950 nm. Each wavelength range is made from a specific semiconductor material family, regardless of the manufacturer. Source: Photonics - Light-Emitting Diodes: A Primer.
The article is worth a read.
Figure 1. The LED color guide from Lumex gives a good overview of the various LED types, chemistry and wavelengths. For some explanation, if required, see LEDs and colour (mine).
Like all diodes (the D of LED), a certain voltage is required for the electrons to get them across the depletion region. The electron releases its energy as a photon. Your hunch is correct and the bandgap of the material gives the characteristic wavelength. Higher bandgaps give shorter wavelengths.
Figure 2. The forward voltage drops vary with current. What is an LED?.
This data for this graph was taken from various datasheets and carefully plotted. The LEDs, however, were from different manufacturers and there is some variation in the forward voltages. The white LEDs, for example, are usually blue with phosphors added so the white curve should overlap the blue curve. I'm still working on this.
answered 26 mins ago
Transistor
72.7k569152
add a comment |Â
up vote
2
down vote
The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 360 to 950 nm. Each wavelength range is made from a specific semiconductor material family, regardless of the manufacturer. Source: Photonics - Light-Emitting Diodes: A Primer.
The article is worth a read.
Figure 1. The LED color guide from Lumex gives a good overview of the various LED types, chemistry and wavelengths. For some explanation, if required, see LEDs and colour (mine).
Like all diodes (the D of LED), a certain voltage is required for the electrons to get them across the depletion region. The electron releases its energy as a photon. Your hunch is correct and the bandgap of the material gives the characteristic wavelength. Higher bandgaps give shorter wavelengths.
Figure 2. The forward voltage drops vary with current. What is an LED?.
This data for this graph was taken from various datasheets and carefully plotted. The LEDs, however, were from different manufacturers and there is some variation in the forward voltages. The white LEDs, for example, are usually blue with phosphors added so the white curve should overlap the blue curve. I'm still working on this.
answered 26 mins ago
Transistor
72.7k569152
add a comment |Â
up vote
2
down vote
up vote
2
down vote
The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 360 to 950 nm. Each wavelength range is made from a specific semiconductor material family, regardless of the manufacturer. Source: Photonics - Light-Emitting Diodes: A Primer.
The article is worth a read.
Figure 1. The LED color guide from Lumex gives a good overview of the various LED types, chemistry and wavelengths. For some explanation, if required, see LEDs and colour (mine).
Like all diodes (the D of LED), a certain voltage is required for the electrons to get them across the depletion region. The electron releases its energy as a photon. Your hunch is correct and the bandgap of the material gives the characteristic wavelength. Higher bandgaps give shorter wavelengths.
Figure 2. The forward voltage drops vary with current. What is an LED?.
This data for this graph was taken from various datasheets and carefully plotted. The LEDs, however, were from different manufacturers and there is some variation in the forward voltages. The white LEDs, for example, are usually blue with phosphors added so the white curve should overlap the blue curve. I'm still working on this.
answered 26 mins ago
Transistor
72.7k569152
The wavelength range of commercially available LEDs with single-element output power of at least 5 mW is 360 to 950 nm. Each wavelength range is made from a specific semiconductor material family, regardless of the manufacturer. Source: Photonics - Light-Emitting Diodes: A Primer.
The article is worth a read.
Figure 1. The LED color guide from Lumex gives a good overview of the various LED types, chemistry and wavelengths. For some explanation, if required, see LEDs and colour (mine).
Like all diodes (the D of LED), a certain voltage is required for the electrons to get them across the depletion region. The electron releases its energy as a photon. Your hunch is correct and the bandgap of the material gives the characteristic wavelength. Higher bandgaps give shorter wavelengths.
Figure 2. The forward voltage drops vary with current. What is an LED?.
This data for this graph was taken from various datasheets and carefully plotted. The LEDs, however, were from different manufacturers and there is some variation in the forward voltages. The white LEDs, for example, are usually blue with phosphors added so the white curve should overlap the blue curve. I'm still working on this.
answered 26 mins ago
Transistor
72.7k569152
edited 12 mins ago
answered 26 mins ago
Transistor
72.7k569152
answered 26 mins ago
Transistor
72.7k569152
answered 26 mins ago
Transistor
72.7k569152
72.7k569152
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