| 초록 |
Upconversion phosphors can emit visible light under the excitation of near-infrared light, and they are attractive materials for applications in bio-imaging, security ink, 3D display, and solar cell. The upconversion intensity is mainly affected by the host materials. Thus, many efforts have been dedicated to seek a proper host materials and a synthetic method in order to achieve high upconversion as well as preparing nano-sized particles. CeO2 host has several advantages such as good chemical stability and low phonon frequency. In this work, Ho3+/Yb3+-codoped CeO2 nanoparticles were synthesized by spray pyrolysis. The resulting particles showed intensive green emission. The concentrations of activators were optimized in terms of achieving the highestluminescence. Also, the emission intensity was further improved by introducing monovalent metal ions for the charge compensation between Ce4+ and Ho3+/Yb3+. |
