For Students · LED Band Gap
LED Band Gap for a photonic crystal
Built for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition. Simulate a photonic crystal live below — adjust the inputs and watch it respond, right in your browser.
LED Band Gap & ColorLive
from energy gap to photon
590 nm
2.10 eV band gap
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An LED emits light when electrons drop across the semiconductor's band gap, each releasing a photon of energy equal to that gap. Since photon energy fixes wavelength (λ = 1240/Eg in nm), the band gap directly sets the color — which is why blue LEDs needed a whole new material (gallium nitride) and a Nobel Prize to achieve.
Data Inspector
Wavelength590 nm
Regionvisible
MaterialGaP/AlInGaP (green-red)
Governing equation
Reading this result: λ = 1240/Eg puts this 2.10 eV gap at 590 nm — a wider gap means a bluer photon, which is exactly why blue LEDs needed the high-gap GaN family.
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