Diodes and electromagnetic emmission Help?

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    Diodes Electromagnetic
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SUMMARY

Determining the appropriate dopants for a diode's pn junction to achieve a specific electromagnetic wavelength is not straightforward, as no accurate model exists for this process. Industry practices involve extensive experimentation, where graduate students create numerous batches with varying dopants and concentrations, subsequently measuring the emitted spectrum of the resulting LEDs. The resulting data is compiled into tables that serve as references for LED colors. While selecting a dopant can approximate a desired color by targeting specific energy levels, an exact formula for color prediction remains elusive.

PREREQUISITES
  • Understanding of semiconductor physics and pn junctions
  • Familiarity with LED technology and its color emission principles
  • Knowledge of doping materials and their effects on semiconductor properties
  • Experience with experimental data analysis and interpretation
NEXT STEPS
  • Research the various dopants used in semiconductor manufacturing and their impact on LED color
  • Explore the relationship between substrate materials and emitted LED wavelengths
  • Study the experimental methods for measuring LED spectra and data compilation
  • Investigate recent advancements in modeling semiconductor behavior and color prediction
USEFUL FOR

Electrical engineers, materials scientists, and researchers involved in semiconductor technology, particularly those focusing on LED development and color optimization.

radaballer
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How would one go about figuring out what to dope a diodes pn junction with in order to create a desired electromagnetic wavelength ?
 
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You don't. My solid state professor told me that no one ever came up with an accurate model for this. He did his grad work on LED's.

What the industry did is to have grad students cook up thousands of batches with different dopants and concentrations. They then measured the spectrum of the resulting LED's and stored the data in tables. Somewhere there must be a book filled with tables for LED colors.

Edit:

You can get close to the color you want by selecting a dopant which creates an ion center at a specific energy level but there is no formula for getting an exact color.

My information may be out of date though. I took solid state physics about 10 years ago.
 
Last edited:
Hey, I found a nice pdf on LED's with some basic tables for LED colors. The color largely depends on the LED substrate material itself.

Check it out here
 
@Okefenokee Great thank you, exactly what i was looking for
 

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