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Updated: Jan 9, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Insight Into Synthesis, Temperature-Dependent Photoluminescence, and the Judd-Ofelt Analysis on the Red-Emitting Eu3+
Jayasree Jayaraman1, V Rathina Mala1, S Masilla Moses Kennedy1
1Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, India.
None:
A thermally stable Eu3+-activated Na2CaMg(PO4)2 (NCMP) phosphor was synthesized via a conventional solid-state reaction method for potential white LED applications. The brianite phase of NCMP was confirmed using PXRD, while its morphology and elemental composition were studied through FE-SEM and EDAX mapping. Diffuse reflectance spectra revealed wide band gaps of 3.87 eV (pure) and 3.99 eV (9 mol% Eu3+), with refractive indices of 2.01 and 2.02, respectively. Under 396 nm excitation, strong red emission at 616 nm was observed, attributed to a dipole-dipole transition. Judd-Ofelt analysis indicated a higher Ω2 than Ω4, suggesting strong covalent interaction between Eu3+ and ligands. The CIE chromaticity coordinates confirmed a red hue with high color purity (91.17%) and warm color temperature. The photoluminescence lifetime decreased with higher doping, whereas thermal stability was maintained at 74%. These findings demonstrate the suitability of NCMP:9 mol% Eu3+ phosphors for solid-state lighting and multifunctional applications.
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