Re: New industrial metals
Hmmm... it probably matters which LEDs, and how much.
The inorganic LEDs presently used for lighting applications are largely made from gallium nitride (GaN). Emission from GaN is in the ultraviolet, and a phosphor coating is used to down-convert to white light, similar to a fluorescent lamp. Inclusion of indium in the alloy (InGaN) will shift the LED's emission from ultraviolet to longer wavelengths (redder light), and I gather that blue InGaN LEDs are more commonly used to pump the phosphors in a white light than pure GaN. Even so, the relative fraction of indium to gallium is probably under 20% or so.
The bigger question I have is whether organic LEDs are going to take over in lighting applications, and how soon. No indium (or gallium) there.
Originally posted by qwerty
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The inorganic LEDs presently used for lighting applications are largely made from gallium nitride (GaN). Emission from GaN is in the ultraviolet, and a phosphor coating is used to down-convert to white light, similar to a fluorescent lamp. Inclusion of indium in the alloy (InGaN) will shift the LED's emission from ultraviolet to longer wavelengths (redder light), and I gather that blue InGaN LEDs are more commonly used to pump the phosphors in a white light than pure GaN. Even so, the relative fraction of indium to gallium is probably under 20% or so.
The bigger question I have is whether organic LEDs are going to take over in lighting applications, and how soon. No indium (or gallium) there.
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