Qingqing Ji exactly indicates difference between bound and free excitons.
If you want to know more and more reasonably, I advise you to read the following information which is attached.
bound exciton is usually an e-h pair bound to a defect such as a lattice atom vacancy, this offers additional coulomb energy to make the bound exciton energy lower than that of the free neutral exciton, giving redshifted PL peak and broadened peak width.
Qingqing Ji exactly indicates difference between bound and free excitons.
If you want to know more and more reasonably, I advise you to read the following information which is attached.
Dear Yuriy.
The pdf file you uploaded is not working. May you please upload it again?
Thank you very much!
Is it possible to see exciton peak in Cathodoluminescence at room temperature
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