Nonlinear optical properties of Er3+/Yb3+-doped NaYF4 nanocrystals

作者：Komarala Vamsi K^*; Wang Yunjun; Xiao Min

来源：Chemical Physics Letters, 2010, 490(4-6): 189-193.

DOI：10.1016/j.cplett.2010.03.041

Nonlinear optical properties of NaYF4 nanocrystals (NCs) doped with Er3+ and Yb3+ ions are investigated. The upconverted luminescence spectra show blue, green and red color emissions from the NaYF4: Er3+/Yb3+ NCs. The color output can be tuned with Yb3+ ion concentration, which is due to the modifications in excited-state absorption and energy transfer process between the Er3+ and Yb3+ ions. The increase of Yb3+ ion concentration in NaYF4: Er3+/Yb3+ NCs causes accompanied increase of nonlinear absorption, as well as nonlinear refractive index, values. The generated electrons with increased Yb3+ concentration in the samples lead to the increased nonlinearities from enhanced multi-photon absorption process.

• 出版日期2010-4-26