Abstract
The Sr(1-x)Al2O4: xEu3+ (0 ≤ x ≤ 5.0%) phosphors were synthesized by solid state reaction method. They crystallized in monoclinic structure and well consistent with that of JCPDS No.34–0379. Thermal and compositional analysis was described in detail. The photoluminescence excitation spectra were recorded monitoring the emission at 612 nm corresponding to the Eu3+: 5D0 → 7F2 transition. The photoluminescence excitation spectrum of undoped SrAl2O4 consists of a broad band with maximum at 278 nm, while the Eu3+ -doped phosphors contain similar broad band of lower intensity and Eu3+ characteristic bands. The photoluminescence properties were analyzed by exciting the studied phosphors at 278 nm (within the host) and at 395 nm (within the Eu3+) wavelengths. The SrAl2O4:Eu3+ phosphors show bluish-pink luminescence at 278 nm excitation and concentration dependent luminescence at 395 nm excitation. The local site symmetry of the host material around the Eu3+ ions was studied by calculating the Judd-Ofelt intensity parameters using the Eu3+: 5D0 → 7FJ (J = 1, 2 and 4) transitions. The experimental results show that the SrAl2O4: Eu3+ phosphors are potential for solid state lighting and display devices.
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