We synthesized polymorphs of Y2-xSi2O7:Eu-x by a solid-state reaction and then examined the red-emitting Y2-xSi2O7:Eu-x (0 <= x <= 2) phosphors for their potential use in cold-cathode fluorescent lamps (CCFLs). The ultimate goal was to use polymorphs of Y2Si2O7 to generate an emission shift to a deep red color. We found that all the crystalline phases of Y2-xSi2O7:Eu-x (alpha, beta, gamma, and delta) could be made by the solid-state reaction. They are adjusted by changing the concentration of Eu ions and altering the annealing temperature. The D-5(0)-> F-7(2) transition (peak wavelength of 626 nm) of Eu3+ ion in the Y2Si2O7 lattice is desirable for CCFL application. The maximal luminance at 626 nm was obtained with Y1.84Si2O7:Eu-0.16 in the alpha phase. However, for the CCFL application, it is necessary to solve the side peak resulting from the D-5(0)-> F-7(1) transition. (c) 2008 The Electrochemical Society. [DOI: 10.1149/1.2993156] All rights reserved.