Influence of asymmetry around Eu3+ ion on luminescence behaviours of ZnO-Na2O-B2O3 glasses synthesized by microwave and conventional melting methods: Red emitting material application

초록

The new comparison techniques using the microwave-assisted (MW) and conventional melt-quench (EF) were studied on Eu3+-doped B2O3-ZnO-Na2O glasses. The optical and structural properties were examined to understand the effect of Eu3+ local environment on luminescence properties. The XRD pattern exhibits characteristic signature of an amorphous structure. The dominant emission peak at 614 nm (5D0 -> 7F2 transition) under excitation at 395 nm shows a greater intensity with the MW_Eu technique. These results are supported by analyses using EXAFS and JO parameters to confirm the asymmetrical structure. The higher Debye-Waller factor (sigma 2) and Judd-Ofelt parameter (Omega 2) show in MW_Eu than EF_Eu techniques. The MW_Eu glass also displayed a higher ED/MD ratio (R = 3.2667), confirming stronger Eu-O covalent bonding. Radioluminescence measurements showed that MW_Eu had a scintillation efficiency of 58 %, outperforming EF_Eu (48 %) relative to BGO standards. CIE chromaticity analysis confirmed red emission from the glasses, with MW_Eu exhibiting coordinates of (x = 0.61, y = 0.38) and a low correlated color temperature (CCT) of 1660 K, indicating its suitability for red light-emitting applications. Combined results from the CIE diagram and X-ray imaging further demonstrated that the MW technique is more favorable than the EF method for use in red-emitting photonic and X-ray imaging applications.

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