The 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 S-5(2), F-5(4)-> I-5(8) 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 (similar to)92 times enhancement in the green emission intensity for 30 mol% co-doping of Zn2+ ions. The lifetime of S-5(2) 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.