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Tuning the Upconversion Efficiency and Spectrum of Upconversion Nanoparticles through Surface Decorating of an Organic Dye

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journal contribution
posted on 10.10.2019 by Meng Xue, Cong Cao, Xiaobo Zhou, Ming Xu, Wei Feng, Fuyou Li
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.