On the combination of praseodymium and cerium, a new concept of improving orange-red luminescence

• Published in: Journal of alloys and compounds Vol. 848; p. 156228
• Main Authors: Kowalski, Robert M., Komar, Jarosław, Solarz, Piotr
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25-12-2020; Elsevier BV
• Subjects: Cerium; Decay; Emission; Energy transfer; Enhanced red emission; Gadolinium-gallium garnet; Garnet; Luminescence; Praseodymium; Quadrupoles; Red phosphor; Energy-transfer; Red phosphor; Cerium; Garnet; Enhanced red emission; Praseodymium
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.156228

A new concept of obtaining red emission in solid-state LED devices based on material composition was proposed. Gd3Ga5O12 (GGG) luminescent compounds doped with both Pr3+ and Ce3+ ions were synthetized. Positions of f-d bands were assigned. Increase of the 1D2 praseodymium red luminescence intensity following the increase of Ce3+ concentration was observed. However, participation of the energy transfer from d levels of Ce3+ to Pr3+ was ruled out. Decay curves of the luminescence originating from the 1D2 and 3P0 multiplets in both GGG:Pr and GGG:Pr + Ce were analyzed as the function of dopants concertation. For diluted Pr3+ they reach ca. 230 and 24 μs Nonexponential character of Pr3+ decay curves was observed. The concentration quenching mechanisms were determined. The quadrupole-quadrupole mechanism of changing the emission color to orange-red in Ce + Pr system may suggest that in this process, more than one of cerium ions take part simultaneously.
A new concept of low cost improving of orange-red luminescence has been presented. Ce3+ concentrations were changed in the range of 0–4.9 at.%. The concentration of Pr3+ is 0.1 at.%. [Display omitted]
•Novel orange-red phosphor has been synthesized.•Energy transfer processes and quenching mechanism have been appointed.•The influence of concentration on the transition ratio has been given.•The energy transfer from Ce3+ to Pr3+ has been excluded.