Generating Blue and Red Luminescence from ZnO/Poly (ethylene glycol) Nanocomposites Prepared Using an In-Situ Method

摘要

The peak of the luminescence spectrum of zinc oxide (ZnO) is usually observed above 500 nm (yellow region). By in-situ growth of ZnO nanoparticles in a poly (ethylene glycol) (PEG) matrix, we have succeeded in producing ZnO/polymer composites with stable luminescence peaks down to 465 nm (blue region). The unbalanced precursor morality approach, where the morality of one precursor (LiOH) is several times larger than the morality represented by a chemical reaction balance, was used. The blue luminescence, which was accompanied by an enhancement of luminescence intensity, was observed at very high LiOH concentrations. This was probably due to the simultaneous reduction in the crystalline size and improvement in the crystallinity. Doping ZnO nanoparticles with europium also generated a red luminescence at 616 nm, due to the ~5D_0→~7F_2 transition of Eu ions.