# I have the eV values of two different materials that are being used for a high speed LEDs. I am in the dark on how to combine the two eVs.

eV=6.2 for AIN and eV=3.4 for GaN.

Any help would be appreciated.

## To combine the eV values of the two materials, you need to understand their relationship. The eV value represents the energy difference between two energy levels in a material. When combining different materials, the energy levels align based on their common reference level, usually the vacuum level.

To combine the eV values, you should use the concept of energy level alignment. Here's how you can do it:

1. Identify the common reference level: In this case, it is the vacuum level.

2. Subtract the eV value of the common reference level (vacuum level) from each material's eV value. This will give you the energy difference between the material's energy level and the common reference level.

eV_diff(AIN) = eV(AIN) - eV(vacuum) = 6.2 eV - 0 eV = 6.2 eV

eV_diff(GaN) = eV(GaN) - eV(vacuum) = 3.4 eV - 0 eV = 3.4 eV

3. Combine the energy differences by adding them together.

Combined eV_diff = eV_diff(AIN) + eV_diff(GaN) = 6.2 eV + 3.4 eV = 9.6 eV

4. Finally, add the combined energy difference to the eV value of the common reference level (vacuum level) to obtain the combined eV value.

Combined eV = eV(vacuum) + Combined eV_diff = 0 eV + 9.6 eV = 9.6 eV

Therefore, the combined eV value of AIN and GaN is 9.6 eV.

Note that this process assumes that the energy levels of the materials are aligned vertically, with the vacuum level as the reference. In practice, the alignment may vary depending on the interface and other factors.