Energy transfer and photoluminescence modification in Yb-Er-Tm triply doped Y2Ti2O7 upconversion inverse opal

摘要

In this article, we fabricated Y2Ti2O7: Yb, Er, Tm upconversion inverse opal photonic crystals with energy transfer between Er~(3+) and Tm~(3+), and investigated the influence of the photonic band gap on the energy transfer between Tm~(3+) and Er~(3+). It is interesting that strong modification of the steady state upconversion emission spectra is observed, and the green or red upconversion emission from Er~(3+) was suppressed in the inverse opal. More significantly, the energy transfer between Tm~(3+) and Er~(3+) is enhanced by suppression of the red upconversion emission of Er~(3+), thus the blue upconversion emission from Tm~(3+) is considerably improved in the inverse opals. Additionally, the mechanisms for upconversion emission of the Y2Ti207: Yb, Er, Tm inverse opal are discussed. We believe that the present work will be valuable for the foundational study of upconversion emission modification and the application of upconversion displays and short wavelength upconversion lasers.