Diodes and electromagnetic emmission Help?

  • Context: Graduate 
  • Thread starter Thread starter radaballer
  • Start date Start date
  • Tags Tags
    Diodes Electromagnetic
Click For Summary

Discussion Overview

The discussion centers around the doping of a diode's p-n junction to achieve a specific electromagnetic wavelength, particularly in the context of light-emitting diodes (LEDs). It explores the challenges and methodologies involved in this process, including industry practices and empirical data collection.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about methods to determine appropriate dopants for achieving desired electromagnetic wavelengths in diodes.
  • Another participant asserts that no accurate model exists for this process, citing their professor's experience and the reliance on empirical data from numerous experiments with various dopants and concentrations.
  • This participant mentions that while it is possible to select dopants to approximate a desired color by targeting specific energy levels, there is no formula for achieving an exact wavelength.
  • A third participant shares a resource with tables for LED colors, noting that the substrate material significantly influences the resulting color.
  • A later reply expresses gratitude for the shared resource, indicating it met their needs.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a definitive method for doping diodes to achieve specific wavelengths, with multiple views on the effectiveness of empirical approaches versus theoretical models.

Contextual Notes

Limitations include the potential obsolescence of the information shared by one participant, as they mention their solid state physics knowledge is about 10 years old, and the reliance on empirical data rather than a theoretical framework for precise outcomes.

radaballer
Messages
86
Reaction score
0
How would one go about figuring out what to dope a diodes pn junction with in order to create a desired electromagnetic wavelength ?
 
Physics news on Phys.org
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
 

Similar threads

Undergrad What Happens to Voltage in a Zener Diode Above Breakdown Voltage?
  • · Replies 6 ·
Replies
6
Views
2K
How do copper oxide solar cells work?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Photoelectric effect in the study of a luminous diode (LED)
  • · Replies 2 ·
Replies
2
Views
2K
I have a question about diodes and the PN junction
  • · Replies 2 ·
Replies
2
Views
2K
Understanding PV Cell Modeling: Single vs Double Diode
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Electromagnetic Waves and different energy manifestations
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Two ways of constructing electromagnetism, which is correct?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Parameters of the rough surface (for electromagnetic scattering)
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Permanent Magnetic Dipole in an electromagnetic field
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Voltage and current waves in a transmission line
  • · Replies 4 ·
Replies
4
Views
3K