Synthesis and photoluminescence properties of novel CaB6O10:RE3+ (RE=Ce, Tb, Dy, Eu) phosphors under ultraviolet excitation

Abstract Novel phosphors CaB 6 O 10 :RE 3+ (RE = Ce, Tb, Dy, Eu) were successfully developed by solid-state reaction method. Spectroscopic properties of CaB 6 O 10 :RE 3+ (RE = Ce, Tb, Dy, Eu) under ultraviolet (UV) light excitation were investigated. Under UV excitation, CaB 6 O 10 :Ce 3+ , CaB 6 O 10 :Tb 3+ , CaB 6 O 10 :Dy 3+ phosphors show strong blue, green and yellowish-white emission, respectively. The CaB 6 O 10 :Eu 3+ phosphor shows a bright red emission, and the integral emission intensity of CaB 6 O 10 :0.2Eu 3+ is 4.31 times of the Y 2 O 3 :Eu 3+ under 392 nm excitation. In addition, CaB 6 O 10 : 0.2Eu 3+ has a better red color purity with CIE (0.658, 0.342) and similar thermostability with Y 2 O 3 :Eu 3+ under UV excitation. These results show that CaB 6 O 10 :RE 3+ could be promising phosphors for light emitting diodes.