The photoluminescence peak of PbS is found to be at 3000 nm. However, the peak is observed to be at 1200 nm when the size of the PbS is reduced to 20 nm. Explain the difference in the photoluminescence peak of the sample material but with altered size. (ii) The ionization potential of the same quantum dot is found to be higher as compared to bulk size PbS. Why is it so? Explain

Answer rating: 100% (QA)

ANSWER The photoluminescence PL peak shifts exist between the samples before and after etching By th... View the full answer