4f → 3d sensitization: a luminescent EuII-MnII heteronuclear complex with a near-unity quantum yield

Gang Yu; Huanyu Liu; Wenchao Yan; Ruoyao Guo; Aoben Wu; Zifeng Zhao; Zhiwei Liu; Zuqiang Bian

doi:10.1039/d2mh01123a

4f → 3d sensitization: a luminescent Eu^II-Mn^II heteronuclear complex with a near-unity quantum yield

Mater Horiz. 2023 Feb 6;10(2):625-631. doi: 10.1039/d2mh01123a.

Authors

Gang Yu¹, Huanyu Liu¹, Wenchao Yan¹, Ruoyao Guo¹, Aoben Wu¹, Zifeng Zhao¹, Zhiwei Liu¹, Zuqiang Bian¹

Affiliation

¹ Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China. zwliu@pku.edu.cn.

PMID: 36515011
DOI: 10.1039/d2mh01123a

Abstract

A new heteronuclear Eu^II-Mn^II complex [Eu(N2O6)]MnBr4 (N2O6 = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane) is designed and synthesized, which shows an intense green emission from Mn^II with a near-unity photoluminescence quantum yield. Measurement of excited-state dynamics demonstrated the sensitization process from Eu^II to Mn^II, which represents the first example of f → d molecular sensitization. Due to the large optical absorption cross-section of the Eu^II center, [Eu(N2O6)]MnBr4 shows an emission intensity 7 to 2500 times stronger than that of the Sr^II-Mn^II control complex [Sr(N2O6)]MnBr4 upon the excitation of near ultraviolet to blue light.