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The cyan SrLaGa 3 O 7 :Bi3+ phosphors were prepared via the solid state sintering processes at 1400 °C. The optical performance was characterized and researched based on the theory calculation and experimental results. The phase and constitution of the prepared SrLaGa 3 O 7 :Bi3+ phosphors were ascertained by the X-ray diffraction and elemental composition analyses. The theory calculations were carried out based on the state density function. Upon the ultraviolet light excitation, SrLaGa 3 O 7 :Bi3+ phosphors yield broadband emission in 380–600 nm relating to the 3P 1 →1S 0 transitions of Bi3+. The full width of the half-maximum of emission band reaches ∼130 nm. Tunable light was achieved by adjusting the content of Bi3+ or changing the excitation wavelength. [Display omitted] • Synthesis of disordered SrLaGa 3 O 7 :Bi3+ phosphor with a wide cyan emission band. • Dependence of emission on excitation wavelength and doping concentration. • Influence of disordered structure on the luminescence of the phosphor. [ABSTRACT FROM AUTHOR]