For annealed nanoparticles Peak is shifting with as-synthesized nanoparticles. Why does this happen?
While annealing, NP-s coupled together - forms either aggregates or fused together and forms bigger size - it'll alters the surface plasmon eventually wich leads to peak shift
First of all after annealing grain size or particle size increases it alter the energy band gap. the reason of system of emission peak shift depends on system to system but overall annealing affects the surface states of nanoparticles that results in shift in emission spectra.
There are many factor related to this, however it also depends upon material you anneal. here is one of my paper you can find some detail about how annealing affect PL of sol gel synthesized SnO2
http://www.researchgate.net/profile/Vijayarangamuthu_Kalimuthu2/publication/256471239_Modification_of_the_structural_and_optical_properties_of_tin_oxide_nanoparticles_by_Co_doping_and_thermal_annealing/links/0f317535a877aa1e7c000000.pdf
Article Modification of the structural and optical properties of tin...
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