Tunable Emission in Heteroepitaxial Ln-SURMOFs
Chen, D.- H. / Haldar, R. / Neumeier, B. / Fu, Z.- H. / Feldmann, C. / Wöll, C. / Redel, E. (2019)
Adv. Funct. Mater., 2019, 1903086, DOI: 10.1002/adfm.201903086
- Date: Juli 2019
By using a layer-by-layer (LbL) approach, lanthanide-based, monolithic metal–organic framework (MOF) thin films are fabricated for optical applications. In particular, the LbL approach allows manufacturing of heteroepitaxial Tb(III)-Eu(III)(BTC) coatings with precise thickness control. Adjusting the Tb(III)-to-Eu(III) ratio allows tuning of the emission color. The hetero-multilayer architecture makes it possible to suppress the direct Tb(III)-to-Eu(III) energy transfer, an unwanted phenomenon present in the corresponding mixed-metal bulk MOF structures. The resulting Ln-MOF thin films, or Ln-surface-anchored MOFs (SURMOFs), are characterized by X-ray diffraction, infra-red reflection absorption spectroscopy, UV–vis, and photoluminescence measurements. The results demonstrate that the heteroepitaxial SURMOF architectures carry huge potential for fabricating optical coatings for a wide range of applications.