Host Differential Sensitization toward Color/Lifetime‐Tuned Lanthanide Coordination Polymers for Optical Multiplexing

Abstract

Optical multiplexing based on luminescent materials with tunable color/lifetime has potential applications in information storage and security. However, the available tunable luminescent materials reported so far still suffer from several drawbacks of low efficiency or poor stability, thus restraining their further applications. Herein, we demonstrate a strategy to develop efficient and stable lanthanide coordination polymers (LCPs) with tunable luminescence as a new option for optical multiplexing. Their multicolor emission from green to red and naked‐eye‐sensitive green emission with tunable lifetime (from ca. 300 to ca. 600 μs) can be controlled by host differential sensitization and energy transfer between lanthanide ions. The quantum efficiencies of developed samples range from around 20 % to 46 % and the luminescence intensity/lifetime appear quite stable in polar solvents up to ten weeks. Furthermore, with the aid of inkjet printing and concepts of luminescence lifetime imaging and time‐gated imaging, we illustrate their promising applications of information storage and security in spatial and temporal domains.

Pyrazine functionalization to boost the antenna effect in rare-earth metal–organic frameworks for tetracycline detection

“…This process of RE sensitization for their characteristic emission is known as the "antenna effect". [34][35][36] Herein, we report a generalizable strategy for the synthesis of highly stable RE-MOFs with shp topology and 12-connected RE 9 clusters. By adjusting the dosage of the modulating reagent (2-fluorobenzoic acid), a total of 26 isostructural RE-MOFs, JNU-205-RE and JNU-206-RE (JNU = Jinan University; RE = Eu, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y), were obtained with X-shaped tetracarboxylate linkers, 4,4′,4″,4′′′-benzene-2,3,5,6-tetrayl-tetrabenzoate (BTEB) and 4,4′,4″,4′′′-pyrazine-2,3,5,6-tetrayl-tetrabenzoate (BTTB).…”

Construction of multi-hydroxyl/ketone lanthanide metal–organic frameworks for understanding mechanochromic luminescence and high proton conductivity

“…[4][5][6][7] Lanthanide metal-organic frameworks (LnMOFs) have emerged as an excellent class of luminescent MOFs because of their unique luminescence characteristics, such as sharp line emission bands, a long luminescence lifetime, large Stokes shifts, and incredible emission change behavior in response to a variety of external stimuli. 8,9 Carlos' group was the first to find that the fluorescence intensity of EuMOFs enhanced with increasing pH in the range of 5-7.5. Zhang et al found that the emission intensity of EuMOFs decreased sharply with time under UV lamp irradiation.…”

Orthogonal luminescence lifetime encoding by intermetallic energy transfer in heterometallic rare-earth MOFs

“…For example, organic compounds with variable lifetime have been reported, including thermally activated delayed fluorescence materials 2,27 . However, the challenges associated with controlling the material structure, have limited the rational design of materials with potential for lifetime-encoding 2,3,8,11,28,29 .…”