Photoluminescence, transmittance and electrical properties of Eu3+-doped Al2O3-SrO glasses synthesized by an aerodynamic levitation technique

Abstract A series of light green and transparent Eu 3+ -doped Al 2 O 3 -SrO glasses were synthesized by an aerodynamic levitation technique. The amorphous natures of the as-prepared glasses were confirmed by X-ray diffraction. The fluorescence excitation spectra of Al 2 O 3 -(3- x )SrO: x Eu 3+ glass phosphors showed an intense O 2- -Eu 3+ charge transfer band at 268 nm. Under the excitation of 268 and 392 nm, these glasses phosphors emitted dominant red emission of Eu 3+ ( 5 D 0 – 7 F 2 transition) at 615 nm. The chromaticity coordinates were found to be (x = 0.64, y = 0.36), which were corresponding to the red emission. The decay lifetime in the range of 1.228–1.250 ms hardly changed, indicating the concentration quenching effects were not obvious and Eu 3+ activators barely underwent the energy migration. Furthermore, Eu 3+ -doped Al 2 O 3 -SrO glasses exhibited high transmittance of around 90% in the VIS–NIR region. They also had remarkable electric insulation performance ( J up to 10 −10 –10 –11 A/cm 2 ), excellent stable frequency of e′ and low dielectric loss (10 −4 −10 −3 ). These findings show Eu 3+ -doped Al 2 O 3 -SrO glasses are multifunctional materials potentially applicable to near UV-based white LEDs as red-emitting components, optical devices and electronic packaging materials.