Tin sulphide nanoparticles showing optical absorption at the 900nm and 1100nm but in the photoluminescence instrument it is not showing any emission why?
Are these dried films ? we have seen strong PL from PbS nanoparticles. It could be because of the defects associated with the nanocrystals. Is the surface of the nanocrystal passivated?
Hi. It is true that one can match the Eg values from absorption and PL peak, but for that the material needs to be of very high quality. For e.g. CdSe quantum dots. If material is defective, then PL shows that band and not band edge emission. On the other hand, if you are seeing multiple absorption peaks as in this publication (http://www.sbfisica.org.br/bjp/files/v36_1046.pdf), then consider first peak edge only as band edge, rest all are due to interference between film and substrate and its not inherent to the material.
Best luck.
Chatan, with agreement of above answers, I also believe that you have not observed PL due to impurity/defects in your SnS. Hence, you have to review your synthesis process.
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