Interaction between the exchanged Mn²⁺ and Yb³⁺ ions confined in zeolite-Y and their luminescence behaviours.

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.

SUBMITTER: Ye S 

PROVIDER: S-EPMC5385532 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature