Abstract
Samarium (Sm)-doped Ca12Al14O33 (CAO) phosphors were synthesized using solid-state reaction method. Crystal structure of Sm3+-doped CAO was investigated using X-ray diffraction and Raman spectroscopy analysis. Raman active peaks at 320 cm−1, 512 cm−1 and 754 cm−1 and 773 cm−1 were attributed to Ca–O, vibration between Al–O–Al, and ν3 mode of AlO45− groups, respectively. The optical band-gap for pure and Sm3+ ion-doped CAO was calculated to be 4.55 eV and 4.50 eV, respectively. Field emission scanning electron microscope (FESEM) image of synthesized phosphors exhibited agglomerated coin-like structure spread with voids. Luminescence properties were analyzed by photoluminescence (PL) spectra. The emission of reddish-orange light due to transition of 4G5/2- 6H7/2 was observed, which was confirmed by the Commission Internationale de l’Eclairage (CIE) chromatic coordinate graph. The maximum intensity of orange-red light was observed in 0.5% Sm3+-doped CAO, and the calculated color purity was 95.2%.
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Kumar, K.G., Bhargav, P.B., Aravinth, K. et al. Reddish-orange-emitting Ca12Al14O33: Sm3+ phosphors with high color purity. Chem. Pap. 76, 1147–1155 (2022). https://doi.org/10.1007/s11696-021-01915-1
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DOI: https://doi.org/10.1007/s11696-021-01915-1