Red phosphors, Li2Sr0.996SiO4: Pr3+0.004, with different hydrothermal conditions were prepared via hydrothermal synthesis and then heat-treatment. The chemical structures of the phosphors were identified with X-ray diffraction (XRD). Surface morpho-logical features were observed by scanning electron microscopic (SEM) investigation. Spectra of excitation and emission for the phosphors were also obtained by a spectrophotometer. Results showed that the optimum conditions were as follows: pH value of so-lution was 1–2, reaction temperature was at 180 oC for 24 h. The as-prepared phosphors exhibited two excitation dominant peaks at 451 and 486 nm, attributed to transitions of3H4→3P2 and3H4→3P0 of Pr3+, respectively. A narrow emission peak at 610 nm corre-sponded to the energy level transition of3P0→3H6 of Pr3+ under excitation of light at 451 nm, which indicated promising candidate red phosphors for blue LED chips.
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