Synthesis and characterizations of novel Ba2La8(SiO4)6O2: Eu3+ oxyapatite phosphors

Abstract A novel red-emitting phosphor Ba 2 La 8 (SiO 4 ) 6 O 2 :Eu 3+ has been synthesized by a high-temperature solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the phase formation of Ba 2 La 8 (SiO 4 ) 6 O 2 :Eu 3+ materials. The photoluminescence excitation and emission spectra, and the concentration dependence of the emission intensity of the phosphor were investigated. The results showed that the phosphor could be efficiently excited by the near ultraviolet (NUV) light and blue light, and it exhibited red light emission. The fundamental band gap energy (absorption edge) of Ba 2 La 8 (SiO 4 ) 6 O 2 , Ba 2 La 4.8 (SiO 4 ) 6 O 2 :3.2Eu 3+ and Ba 2 Eu 8 (SiO 4 ) 6 O 2 to be approximately 4.05 eV, 3.60 eV and 3.54 eV. The calculated color coordinates lies in the red region. Therefore, these obtained results suggest that the prepared phosphors exhibit great potential for use as red emitting phosphor for near ultraviolet white light emitting diodes (NUV WLEDs).