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.

Laterally Engineering Lanthanide‐MOFs Epitaxial Heterostructures for Spatially Resolved Planar 2D Photonic Barcoding

“…The synthesized MOFs microparticles display almost the same Fourier‐transform Infrared (FTIR) spectra with the initial microrods (Figure S9), suggesting that these MOFs have the similar chemical composition and coordination structures. The as‐prepared Ln‐MOFs demonstrate excellent thermostability and high stability under various environments (Figure S10,11), which endow them with practical applications abilities for security labels [16, 17] …”

“…As shown in the scanning electron microscopy (SEM) images in Figure 2a-c, the developed Ln-MOF MOFs microrods and microplates have smooth surfaces,w hich exhibit clear 1D morphology and regular rectangular or square shapes,r espectively.T he synthesized MOFs microparticles display almost the same Fourier-transform Infrared (FTIR) spectra with the initial microrods (Figure S9), suggesting that these MOFs have the similar chemical composition and coordination structures.T he as-prepared Ln-MOFs demonstrate excellent thermostability and high stability under various environments (Figure S10,11), which endow them with practical applications abilities for security labels. [16,17]…”

Europium(III) Complex-Functionalized SiO2@mTiO2 Nanospheres for Al3+-Modulated Multicolor Emission

“…Lanthanide-based luminescent hybrid materials have sharp emission bands, high color purity, long luminescent lifetime and high quantum efficiency. They can also act as excellent candidates for multicolor luminescent materials, and further are applied in many fields, such as bio-imaging and bioanalytical detection [1,2], luminescent probes and sensors [3][4][5], tunable luminescence [6][7][8], and optoelectronic devices and displays [9][10][11]. In the past years, color-tunable lanthanide-based materials usually control the stoichiometric ratios of doped ions in the same material to realize multicolor emission (containing white-light emission) [12][13][14][15].…”

Encoding Multilayer Complexity in Anti‐Counterfeiting Heterometallic MOF‐Based Optical Tags

“…Additionally, the inherent porosity in MOFs has been utilized via the inclusion of photoswitchable quenching molecules, allowing the tag features to be selectively revealed [22] . In this context, only a single study has focused on the design of multilayered encoding in MOFs via emission color and lifetime in the visible range [23] . Additionally, fundamental understanding of the specific structure–function relationships underlying the photoluminescent properties used for encoding are lacking.…”