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A ratiometric fluorescent sensor based on luminescent bio-metal-organic framework was prepared by exchanging both Tb3+ and Eu3+ cations into anionic bio-MOF-1. Due to a highly efficient energy transfer from Tb3+ to Eu3+ (>89%), emission color of Tb/Eu@bio-MOF-1 was orange-red even though Tb3+ was the dominant content in this Tb/Eu co-doping material. More interestingly, this energy transfer process...
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