We are observing a very good pattern of decreasing of band gap of the luminescent composite materials with increasing of the emission intensity.
Hi Aneliya,
May be, you are doping or modifying your composites using dopants or modifiers. Modifying or doping can increase or decrease band gap of a material with either increase or decrease of emission intensity. Increase in emission intensity generally occurs due to the passivation of surface or reduction of trap states within bandgap of an emissive material. Defect states within bandgap generally decreases when passivation/doping of an emissive material works. We also observed similar patterns for CsPbBr3 nanocrystals during their anion exchange and modification. You can look at this article: 10.1039/C8NR04763D
Thanks,
Aslam
Aneliya,
I believe it is because when decreasing the bandgap, the excitons are more likely to recombine with each other (e.g., excited electrons can jump back to recombine with the holes). I don't know the details of your experiment but the increase in recombination probability might be due to the more excited electrons.
I agree with Dr. Liu. Recombination at either the back end or front glazing could be one of the reasons here
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