Tuning the Upconversion Efficiency and Spectrum of Upconversion Nanoparticles through Surface Decorating of an
Meng Xue1, Cong Cao1,2, Xiaobo Zhou1
1Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, Institute of Biomedicine Sciences, and Collaborative Innovation Center of Chemistry for Energy Materials , Fudan University , 220 Handan Road , Shanghai 200433 , P. R. China.
Abstract:
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.
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