In this letter, a yellow-emitting ${\mathrm{Sr}}_3\mathrm{Si}{\mathrm{O}}_5:{\mathrm{Ce}}^{3+},{\mathrm{Li}}^{+}$ phosphor is reported. Through transitions of $5d\to 4f$ (${}^{2}F_{7∕2}$ and ${}^{2}F_{5∕2}$ ) in ${\mathrm{Ce}}^{3+}$ , the phosphor showed a very broad and strong yellow emission under near ultraviolet (UV) or blue light excitation. The energy levels of ${\mathrm{Ce}}^{3+}$ in ${\mathrm{Sr}}_3\mathrm{Si}{\mathrm{O}}_5$ were suggested from its absorption and excitation spectra. White light could be obtained by combining this phosphor with 460 or $405\mathrm{nm}$ light-emitting diodes (LEDs) [$(x,y)=(0.3086,0.3167)$ or (0.3173, 0.3103)]. Additionally, a yellow LED was fabricated using a near-UV LED ($380\mathrm{nm}$ chip) with ${\mathrm{Sr}}_3\mathrm{Si}{\mathrm{O}}_5:{\mathrm{Ce}}^{3+},{\mathrm{Li}}^{+}$ .