Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202216269
Keywords
Cooperative Luminescence; Energy Transfer; Lanthanides; Metal-Organic Frameworks; Upconversion Luminescence
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Lanthanide-doped metal-organic frameworks (Ln-MOFs) with upconversion luminescence were successfully synthesized by doping Yb-BTC MOF 1D microrods with Er3+, Ho3+, Tb3+, and Eu3+ ions. The MOFs exhibited both cooperative luminescence from Yb3+ and characteristic emission bands of the dopant ions. In contrast, the MOFs doped with Tm3+, Pr3+, Sm3+, and Dy3+ ions only showed the 497 nm upconversion emission band from Yb3+.
Lanthanide-doped metal-organic frameworks (Ln-MOFs) have versatile luminescence properties, however it is challenging to achieve lanthanide-based upconversion luminescence in these materials. Here, 1,3,5-benzenetricarboxylic acid (BTC) and trivalent Yb3+ ions were used to generate crystalline Yb-BTC MOF 1D-microrods with upconversion luminescence under near infrared excitation via cooperative luminescence. Subsequently, the Yb-BTC MOFs were doped with a variety of different lanthanides to evaluate the potential for Yb3+-based upconversion and energy transfer. Yb-BTC MOFs doped with Er3+, Ho3+, Tb3+, and Eu3+ ions exhibit both the cooperative luminescence from Yb3+ and the characteristic emission bands of these ions under 980 nm irradiation. In contrast, only the 497 nm upconversion emission band from Yb3+ is observed in the MOFs doped with Tm3+, Pr3+, Sm3+, and Dy3+. The effects of different dopants on the efficiency of cooperative luminescence were established and will provide guidance for the exploitation of Ln-MOFs exhibiting upconversion.
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