| 초록 |
Fluorescent semiconductor nanocrystals, or quantum dots (QDs), are promising color converting materials that will be useful in next-generation devices because QDs exhibit unique optical properties. In optoelectric devices, QDs are usually embedded in polymer matrix, known as polymer nanocomposite, in order to protect QDs from harsh environment. However, in QD/polymer nanocomposites, QDs surface property have an effect on the efficiency of nanocomposites. When QDs are incoporated in polymer composite, ligand detach and aggregation of QDs could occurs because of low compatability between QDs and polymer matrix. To enhance inter particle distance and protect QD surfaces, we introduced polymer mediated particle crosslinking system. First, we coated QD surface with amphiphilic polymer ligands to minimize quantum yield reduction and crosslinked between QDs by adding crosslinkable end-functionalized polymer. And we investigated optical properties of prepared QD/polysiloxane nanocomposite such as quantum yield, transparency. Also, it exhibited higher stability under UV irradiation and high temperature because of high QD surface coverage and dispersion enhancement. |
