Tuning the Upconversion Efficiency and Spectrum of Upconversion Nanoparticles through Surface Decorating of an Organic Dye
journal contributionposted on 10.10.2019 by Meng Xue, Cong Cao, Xiaobo Zhou, Ming Xu, Wei Feng, Fuyou Li
Any type of content formally published in an academic journal, usually following a peer-review process.
In this paper, we utilized the energy-transfer process between upconversion nanoparticles (UCNPs) and organic dye molecules to enhance the upconversion quantum yield (UCQY) of a UCNPs–dye system and tune the luminescence output color. The results indicate that adding an energy dissipation pathway to the energy donor through an energy-transfer process can decrease the ratio of nonradiative transition and cause a new radiative pathway. Through calculation of the rate equations, we studied the effects of the energy-transfer efficiency and activator type on the UCQY enhancement. On the basis of calculations of the CIE color coordinates, tunable color from Er3+, Tm3+, Ho3+, and Tb3+ ions was generated by surface decorating of an organic dye. The approach described here provides a new way to optimize the UCQY and manipulate the emission through energy transfer in a nanoscopic region.