|
Second, when water is added, the solute molecules can aggregate into two kinds of nanoparticle suspensions: crystal particles and amorphous particles. The former leads to an enhancement in the intensity of photoluminescence emission, while the latter leads to a reduction in intensity. 7 Thus, the measured overall PL intensity data depends on the combined actions of the two kinds of nanoparticles. However, it is hard to control the formation of nanoparticles in high water content. Thus, the measured photoluminescence intensity often shows no regularity in high water content |