Synt hesis and Photoluminesc ence Properties of Silica Capped Z nO Quantum Dots

ZnO Quantum Dots (QDs) can potentially be used as photoluminescence (PL) materials because of their w ide direct band gap, easy availability, and cost effectiveness. Recently, these materials have be en shown t o be applic able in the manufactu re of Light Emitting Diodes (LED s), optical de vices, and b iological cell labeling applications [۱].In this work, ZnO quantum dots were sy nthesized by using a sol gel method and the effect of base catalysis (Li OH) concentration and reaction tem perature on the PL and a bsorption s pectra of sa mples were examined. To stabilize photoluminescence, Silica (SiO۲) were used as a matrix for ZnO QDs because it is chemically stable e xcept in a strong acid o r base, and has a low refractive index, which ca n contribute to effective excitation by ultraviole t light[۲,۳].

کلیدواژه ها:

Quantum Dots ، S ol Gel ، Phot oluminescen ce ، ZnO