The Luminescence Properties of the Interstitial Eu2+ in SrB2O4 for UV Light‐Emitting Diode

SrB 2 O 4 :Eu 2+ is prepared by the high‐temperature solid‐phase method. The structure is characterized by X‐ray diffraction, and the luminescence properties are analyzed using fluorescence spectroscopy and decay curves. SrB 2 O 4 :Eu 2+ has strong absorption in the UV region and two broadband emissions in the 350–550 nm, located at 374 and 458 nm. The broadband emission around 374 nm belongs to Eu 2+ emission at the Sr lattice position, and the emission around 458 nm belongs to interstitial Eu 2+ ions. At low concentrations, Eu 2+ replaces the position of Sr 2+ first, and the emission peak of 374 nm is stronger than that of 458 nm in the emission spectrum. The luminescence at 458 nm enhances significantly as the concentration of Eu 2+ ions increases. The fluorescence lifetime confirms the presence of two luminescent centers, the Eu Sr and the interstitial Eu 2+ ions. The temperature dependence luminescence of SrB 2 O 4 :Eu 2+ is explored, and the activation energy is calculated to be Δ E a = 0.3622 eV. The Commission Internationale de l'Éclairage (CIE) chromaticity coordinates of SrB 2 O 4 :Eu 2+ are in the blue area. The results indicate that the interstitial Eu 2+ benefits the color‐rendering index when SrB 2 O 4 :Eu 2+ is used as a blue phosphor in UV light‐emitting diode (LED).