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Interaction between the exchanged Mn 2+ and Yb 3+ ions confined in zeolite-Y and their luminescence behaviours

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ABSTRACT

Luminescent zeolites exchanged with two distinct and interacted emissive ions are vital but less-studied for the potential applications in white light emitting diodes, solar cells, optical codes, biomedicine and so on. Typical transition metal ion Mn2+ and lanthanide ion Yb3+ are adopted as a case study via their characteristic transitions and the interaction between them. The option is considered with that the former with d-d transition has a large gap between the first excited state 4T1 and the ground state 6A1 (normally >17,000 cm−1) while the latter with f-f transition has no metastable excited state above 10,000 cm−1, which requires the vicinity of these two ions for energy transfer. The results of various characterizations, including BET measurement, photoluminescence spectroscopy, solid-state NMR, and X-ray absorption spectroscopy, etc., show that Yb3+ would preferably enter into the zeolite-Y pores and introduction of Mn2+ would cause aggregation of each other. Herein, cation-cation repulsion may play a significant role for the high valence of Mn2+ and Yb3+ when exchanging the original cations with +1 valence. Energy transfer phenomena between Mn2+ and Yb3+ occur only at elevated contents in the confined pores of zeolite. The research would benefit the design of zeolite composite opto-functional materials.

No MeSH data available.


SEM images of some typical samples.(a,c) zeolite-Y calcined at 800 °C; (b,d) 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C.
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f2: SEM images of some typical samples.(a,c) zeolite-Y calcined at 800 °C; (b,d) 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C.

Mentions: Since the immersion of zeolite-Y in the Yb3+ and Mn2+ solutions makes the Yb3+ and Mn2+ ions as well as the anion ions (such as Cl−) absorbed not only in the zeolite pores but also on the zeolite surface, which might result in unsmooth surface after the annealing treatment. Figure 2 displays the SEM images of some typical samples of zeolite-Y and 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C. Apparently, the particles of the samples are angular with irregular shape and smooth surface, suggesting that the exchanged-ions may be mostly located inside the pores of zeolite-Y. Further evidences will be listed below.


Interaction between the exchanged Mn 2+ and Yb 3+ ions confined in zeolite-Y and their luminescence behaviours
SEM images of some typical samples.(a,c) zeolite-Y calcined at 800 °C; (b,d) 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5385532&req=5

f2: SEM images of some typical samples.(a,c) zeolite-Y calcined at 800 °C; (b,d) 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C.
Mentions: Since the immersion of zeolite-Y in the Yb3+ and Mn2+ solutions makes the Yb3+ and Mn2+ ions as well as the anion ions (such as Cl−) absorbed not only in the zeolite pores but also on the zeolite surface, which might result in unsmooth surface after the annealing treatment. Figure 2 displays the SEM images of some typical samples of zeolite-Y and 0.2Yb, 0.8Mn/zeolite-Y calcined at 800 °C. Apparently, the particles of the samples are angular with irregular shape and smooth surface, suggesting that the exchanged-ions may be mostly located inside the pores of zeolite-Y. Further evidences will be listed below.

View Article: PubMed Central - PubMed

ABSTRACT

Luminescent zeolites exchanged with two distinct and interacted emissive ions are vital but less-studied for the potential applications in white light emitting diodes, solar cells, optical codes, biomedicine and so on. Typical transition metal ion Mn2+ and lanthanide ion Yb3+ are adopted as a case study via their characteristic transitions and the interaction between them. The option is considered with that the former with d-d transition has a large gap between the first excited state 4T1 and the ground state 6A1 (normally >17,000 cm−1) while the latter with f-f transition has no metastable excited state above 10,000 cm−1, which requires the vicinity of these two ions for energy transfer. The results of various characterizations, including BET measurement, photoluminescence spectroscopy, solid-state NMR, and X-ray absorption spectroscopy, etc., show that Yb3+ would preferably enter into the zeolite-Y pores and introduction of Mn2+ would cause aggregation of each other. Herein, cation-cation repulsion may play a significant role for the high valence of Mn2+ and Yb3+ when exchanging the original cations with +1 valence. Energy transfer phenomena between Mn2+ and Yb3+ occur only at elevated contents in the confined pores of zeolite. The research would benefit the design of zeolite composite opto-functional materials.

No MeSH data available.