Two Series of Lanthanide Coordinated Compounds and Novel Three-Component Near-White Light Emission

Xin, Ling-Yun; Ju, Feng-Yang; Li, Yun-Ping; Li, Xiaoling; Liu, Guang‐Zhen

doi:10.1007/s10904-019-01396-6

“…RE‐based nanomaterials have been thoroughly explored for use as photoluminescent tags, owing to their resistance to photobleaching, long fluorescent lifetimes, and narrow, non‐overlapping emission bands over a wide range of visible and nonvisible wavelengths [7] . By combining multiple RE metals with different emission features in a single structure or alloy, a complex signature can be created based on the emission peaks and their ratios [8] . However, one significant drawback of RE metals is that they do not efficiently absorb light.…”

Section: Introductionmentioning

confidence: 99%

“…[7] By combining multiple RE metals with different emission features in asingle structure or alloy, ac omplex signature can be created based on the emission peaks and their ratios. [8] However,one significant drawback of RE metals is that they do not efficiently absorb light. Without apowerful excitation source,they require sensitizers in order to produce emissions bright enough to detect.…”

Section: Introductionmentioning

confidence: 99%

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

Deneff

¹

,

Butler

²

,

Rohwer

³

et al. 2020

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Optical tags provide away to quickly and unambiguously identify valuable assets.C urrent tag fluorophore options lackt he tunability to allowc ombined methods of encoding in as ingle material. Herein we report ad esign strategy to encode multilayer complexity in af amily of heterometallic rare-earth metal-organic frameworks based on highly connected nonanuclear clusters.T oi mpart both intricacy and security,asynergistic approach was implemented resulting in both overt (visible) and covert (near-infrared, NIR) properties,w ith concomitant multi-emissive spectra and tunable luminescence lifetimes.T ag authentication is validated with av ariety of orthogonal detection methodologies.I mportantly, the effect induced by subtle compositional changes on intermetallic energy transfer,a nd thus on the resulting photophysical properties,i sd emonstrated. This strategy can be widely implemented to create alarge library of highly complex, difficult-to-counterfeit optical tags.

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Enhancement of Luminescence from Lanthanide Metal–Organic Frameworks by Ytterbium and Calcium Doping: Application to Photonic Barcodes and Fingerprint Detection

Chen,

Li,

Sun

et al. 2024

Adv Funct Materials

11

0

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Emission from metal–organic frameworks (MOFs) made from Eu3+ and 1,3,5‐benzenetricarboxylic acid (BTC) is enhanced eightfold by doping with Y3+ and Ca2+ ions. The Ca2+ ions are shown to substitute into the MOFs, and the MOFs structure is shown to be retained at high Y3+ doping levels. The emission enhancement is shown to be associated with variations in the local electric field at the Eu3+ centers in the MOFs. Calculations indicate that the HOMO and LUMO levels vary considerably with both Y3+ doping and with low‐level Ca2+ doping. These then modulates Eu3+ concentration quenching, ligand‐metal energy transfer processes, and the local electric field at the Eu3+ centers, qualitatively accounting for the primary observed features. For UV excitation (250, 295, and 393 nm, respectively), the greatest emission enhancement comes from the doped MOFs with 10% Eu3+, 89% Y3+, and 1% Ca2+. In a photonic barcode application, the doped MOFs are shown to facilitate increased information storage density, and in a fingerprinting application, they are displayed to lead to higher photostability and reduced materials demand.

show abstract

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

Deneff

¹

,

Butler

²

,

Rohwer

³

et al. 2020

View full text Add to dashboard Cite

Optical tags provide away to quickly and unambiguously identify valuable assets.C urrent tag fluorophore options lackt he tunability to allowc ombined methods of encoding in as ingle material. Herein we report ad esign strategy to encode multilayer complexity in af amily of heterometallic rare-earth metal-organic frameworks based on highly connected nonanuclear clusters.T oi mpart both intricacy and security,asynergistic approach was implemented resulting in both overt (visible) and covert (near-infrared, NIR) properties,w ith concomitant multi-emissive spectra and tunable luminescence lifetimes.T ag authentication is validated with av ariety of orthogonal detection methodologies.I mportantly, the effect induced by subtle compositional changes on intermetallic energy transfer,a nd thus on the resulting photophysical properties,i sd emonstrated. This strategy can be widely implemented to create alarge library of highly complex, difficult-to-counterfeit optical tags.

show abstract

Two Series of Lanthanide Coordinated Compounds and Novel Three-Component Near-White Light Emission

Cited by 3 publications

References 32 publications

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

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

Enhancement of Luminescence from Lanthanide Metal–Organic Frameworks by Ytterbium and Calcium Doping: Application to Photonic Barcodes and Fingerprint Detection

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

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