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4f → 3d sensitization: a luminescent EuII-MnII heteronuclear complex with a near-unity quantum yield
Gang Yu1, Huanyu Liu1, Wenchao Yan1
1Beijing 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.
Abstract:
A new heteronuclear EuII-MnII 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 MnII with a near-unity photoluminescence quantum yield. Measurement of excited-state dynamics demonstrated the sensitization process from EuII to MnII, which represents the first example of f → d molecular sensitization. Due to the large optical absorption cross-section of the EuII center, [Eu(N2O6)]MnBr4 shows an emission intensity 7 to 2500 times stronger than that of the SrII-MnII control complex [Sr(N2O6)]MnBr4 upon the excitation of near ultraviolet to blue light.
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