Enhanced Mn2+ emission from cation disordered substitution in Ba6CaNaYAl2Si6O24:Eu2+, Mn2+ phosphors

• Published in: Journal of materials science. Materials in electronics Vol. 35; no. 5; p. 343
• Main Authors: Ha, Heonji, Yang, Sungjun, Park, Sangmoon
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2024; Springer Nature B.V
• Subjects: Barium; Cations; Characterization and Evaluation of Materials; Chemistry and Materials Science; Color temperature; Emission spectra; Energy transfer; Europium; Light emitting diodes; Materials Science; Optical and Electronic Materials; Optical materials; Phosphors; Photoluminescence; Polyhedra; Quantum efficiency; Synchrotron radiation; Tetrahedra; X ray powder diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-12091-9

The emission of Mn 2+ in an orange hue within cation-disordered optical materials, consisting of Ba 6 CaNaYAl 2 Si 6 O 24 :Eu 2+ , Mn 2+ , was significantly enhanced through efficient energy transfer, when compared to the performance of Eu 2+ , Mn 2+ -doped Ba 6 Ca 3 Al 2 Si 6 O 24 phosphors. The degree of polyhedral distortions within the Ba 6 CaNaYAl 2 Si 6 O 24 structure was ascertained using synchrotron X-ray powder diffraction. The cation-disordered host structure incorporates 12-, 9-, and 10-coordinated polyhedra involving Ba(I), Ca/Y(II), and Ba/Na(III) ions, along with AlO6 octahedra and isolated SiO4 tetrahedra. Photoluminescence emission spectra of the cation-disordered Ba 5.9- q Eu 0.1 Mn q CaNaYAl 2 Si 6 O 24 ( q  = 0–0.4) phosphors were examined, along with the energy-transfer process from Eu 2+ to Mn 2+ according to Förster’s theory, both occurring under 365-nm excitation. White and orange electroluminescent emission spectra, color rendering index, correlated color temperature, Commission Internationale de l’Eclairage coordinates, and internal/external quantum efficiency were measured for Ba 5.5 Eu 0.1 Mn 0.2 CaNaYAl 2 Si 6 O 24 phosphors, both with and without commercial phosphors on a 365-nm LED chip. Moreover, the activation energy of thermal quenching for Ba 5.9- q - Eu 0.1 Mn q CaNaYAl 2 Si 6 O 24 ( q  = 0.2, 0.4) phosphors within the temperature range of 298–448 K was determined when illuminated by a 365-nm light-emitting diode (LED).