Novel Reddish-Orange Emitting Phosphor K2Al2B2O7:Sm3+

K_2–xSm_xAl₂B₂O₇ (0.0025 ≤ x ≤ 0.04) phosphors were synthesized by a solution combustion method. The X-ray powder diff raction (XRD) method was used to study the phase formation of K₂Al₂B₂O₇. The bond structure of the K₂Al₂B₂O₇ was obtained by using infrared spectrum measurements. In order to investigate the photoluminescence characteristics of the K₂Al₂B₂O₇:Sm³⁺ phosphors, measurements of the excitation and emission spectra were made. The standard 4f–4f electronic transitions of Sm³⁺ were seen in the excitation spectrum at ambient temperature. The emission spectrum of K₂Al₂B₂O₇:Sm³⁺ exhibited four emission peaks corresponding to ⁴G_5/2 → ⁶H_5/2 (564 nm), ⁴G_5/2 → ⁶H_7/2 (600 nm), ⁴G_5/2 → ⁶H_9/2 (646 nm), and ⁴G_5/2 → ⁶H_11/2 (706 nm) transitions of Sm³⁺. Lastly, the correlation between emission intensity and Sm³⁺ content was thoroughly investigated.