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4f → 3d sensitization: a luminescent EuII–MnII heteronuclear complex with a near-unity quantum yieldYu, Gang; Liu, Huanyu; Yan, Wenchao; Guo, Ruoyao; Wu, Aoben; Zhao, Zifeng; Liu, Zhiwei; Bian, Zuqiang
Materials horizons, 02/2023, Letnik: 10, Številka: 2Journal Article
A new heteronuclear EuII–MnII complex Eu(N2O6)MnBr4 (N2O6 = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo8.8.8hexacosane) 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.
