You will usually have defect states in your material, particularly for polycrystalline samples, the random distribution of defects will lead to band tailing, which can be observed in PL.BelNaz said:hi,
i did an experiment of photoluminescence in the lab and i was wondering about the spectrum of emission.
why we get emission of photons with energies below the energy gap of the semiconductor?
thanks
The spectrum of emission in photoluminescence refers to the range of wavelengths of light that are emitted by a material after it has been excited by a light source. This emission can be in the form of fluorescence, phosphorescence, or other types of luminescence.
The spectrum of emission in photoluminescence is typically measured using a spectrometer, which separates the different wavelengths of light emitted by the material and detects them using a detector. The resulting data is then plotted to create a spectrum of emission.
The spectrum of emission in photoluminescence can be affected by various factors, including the composition and structure of the material, the excitation source, the temperature, and any impurities or defects present in the material.
The spectrum of emission in photoluminescence is used in many scientific fields, including materials science, chemistry, and biology. It can provide valuable information about the properties and behavior of materials, such as their energy levels, composition, and purity.
Yes, the spectrum of emission in photoluminescence has many practical applications, such as in LED technology, solar cells, and medical imaging. It is also used in quality control and characterization of materials in various industries.