Cerium ion activated ZnAl2O4 phosphors were first time prepared by efficient and simple biogenic synthesis approach using aloe vera extract. The prepared samples were characterized by x-ray diffraction (XRD), ultraviolet visible spectroscopy (UV), and photoluminescence technique (PL). From XRD technique, the crystal structure of the prepared Ce3+ doped ZnAl2O4 phosphors was calculated and it was a cubic structure. The optical band gap energies of ZnAl2O4 host and Ce3+ doped ZnAl2O4 were calculated using the UV spectroscopy technique. The PL spectra were showed the maximum intensity for Ce3+ doped ZnAl2O4 at 530 nm and 598 nm under 398 nm excitation wavelength. The CIE color co-ordinates of the Ce3+ doped ZnAl2O4 are calculated using radiant imaging color calculator program refer to the 1931 CIE Standard Source C (illuminant Cs (0.3101, 0.3162)).
The present communication is strongly focused on the investigation of synthesis, structural and luminescence properties of cerium (Ce 3+ )-and europium (Eu 3+ )activated Zn 4 Al 22 O 37 phosphors. Ce 3+ -and Eu 3+ -doped Zn 4 Al 22 O 37 novel phosphors were prepared using a solution combustion synthesis route. Structural properties were studied using powder X-ray diffraction and high-resolution transverse electron microscopy. The optical properties were studied using ultraviolet-visible light spectroscopy and Fourier transform infrared spectroscopy; luminescence properties were studied using a photoluminescence (PL) technique. The crystal structure of the prepared Zn 4 Al 22 O 37 host and Ce 3+ -and Eu 3+ -activated Zn 4 Al 22 O 37 phosphors was investigated and was found to have a hexagonal structure. The measured PL emission spectrum of the Ce 3+ -doped Zn 4 Al 22 O 37 phosphor showed an intense and broad emission band centred at 421 nm under a 298 nm excitation wavelength. By contrast, the Eu 3+ -doped Zn 4 Al 22 O 37 phosphor exhibited two strong and intense emission bands at approximately 594 nm (orange) and 614 nm (red), which were monitored under 395 nm excitation. The Commission Internationale de l'Eclairage
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