Large enhancement in upconverted green emission intensity from Ho3+/Yb3+ co-doped Y2Ti2O7 phosphor in the presence of Zn2+

Publication date: Available online 1 April 2019Source: Materials Research BulletinAuthor(s): P.K. Vishwakarma, A. Bahadur, Akanksha Maurya, S.B. RaiAbstractThe Ho3+, Yb3+ co-doped Y2Ti2O7 phosphor samples have been synthesized through solid state reaction method in the absence and presence of Zn2+ ions. The X-ray diffraction (XRD) analysis show that the phase of the crystal is face centered cubic. The zinc free phosphor shows weak upconversion emission in green region due to 5S2, 5F4 →5I8 transition of Ho3+ ion on excitation with 980 nm radiation. The emission intensity is enhanced significantly in the presence of Zn2+ ions due to increase in crystallinity, particle size and asymmetry in the crystal field. We are reporting ˜92 times enhancement in the green emission intensity for 30 mol% co-doping of Zn2+ ions. The lifetime of 5S2 level of Ho3+ ion increases by increasing the concentration of Zn2+ ions. The intense green emission in this material may be suitable for display and other fluorescence based devices.Graphical abstract

Source: Materials Research Bulletin - April 2, 2019 Category: Materials Science Source Type: research