If the energy band gap is observed to be increased then can we call it as blue shifted?.
If I understood your question correctly, the answer is yes. This is because, as the energy gap increases, the energy required for excitation increases. Since energy is inversely related to wavelength (E=hc/lambda), a shorter wavelength (higher energy) light will be required for photo-excitation from its ground to the excited state. Thus we can say that the absorption wavelength for the material has blue shifted or shifted towards lower wavelength or higher energy.
Dear Mallika,
Yes, it is called a blue-shift. Because as the band gap increases, the absorption shifts towards lower wavelength region, i.e., blue-region. The opposite to this is called the red-shift.
Good luck!
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Energy