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

• Published in: Materials horizons Vol. 1; no. 2; pp. 625 - 631
• Main Authors: Yu, Gang, Liu, Huanyu, Yan, Wenchao, Guo, Ruoyao, Wu, Aoben, Zhao, Zifeng, Liu, Zhiwei, Bian, Zuqiang
• Format: Journal Article
• Language: English
• Published: 06.02.2023
• ISSN: 2051-6347; 2051-6355
• DOI: 10.1039/d2mh01123a

A new heteronuclear Eu II -Mn II complex [Eu(N2O6)]MnBr 4 (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)]MnBr 4 shows an emission intensity 7 to 2500 times stronger than that of the Sr II -Mn II control complex [Sr(N2O6)]MnBr 4 upon the excitation of near ultraviolet to blue light. A new heteronuclear Eu II -Mn II complex with high photoluminescence quantum yield is designed and synthesized, which represents the first example of f → d molecular sensitization.