White Light and Color‐Tuning Long Persistent Luminescence from Metal Halide Based Metal‐Organic Frameworks

Wang, Zheng; Mo, Jingshan; Pan, Junjie; Pan, Mei

doi:10.1002/adfm.202300021

Cited by 29 publications

(20 citation statements)

References 25 publications

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“…[ 1–6 ] Many efforts have been contributed to the design of materials with highly efficient RTP via the strategy of enhancing the intersystem crossing (ISC) rate and stabilizing triplet excitons for long‐lived lifetimes, especially in the molecular crystalline materials due to their highly ordered structures. [ 7–12 ] In this respect, many families of crystalline systems, including one‐component organic crystals, [ 13–16 ] hybrid halides, [ 17–20 ] and metal‐organic complexes, [ 21–24 ] have been developed with efficiently persistent emission and prolonged lifetimes. More recently, stimuli‐responsive RTP complexes are attracting more attention for their importance in constructing smart luminescent switches and developing optical logical gates.…”

Section: Introductionmentioning

confidence: 99%

Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Feng

et al. 2023

Adv Funct Materials

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Photoswitchable room temperature phosphorescence (RTP) materials are of great interest due to their potential applications in optical devices and switches. Herein, two Zn‐based coordination polymers (CPs) (H3‐TPB)·[Zn6(H‐HEDP)(HEDP)3(H2O)2]·5H2O (complex 1; HEDP = hydroxyethylidene diphosphonate; TPB = 1,3,5‐tris(4‐pyridyl)benzene) and (H‐TPB)·[Zn3(H‐HEDP)(HEDP)(H2O)]·2H2O (complex 2) with distinguishable photochromism and tunable RTP are synthesized involving photoactive TPB molecules with different packing modes. Complex 1 exhibits bidirectionally on/off RTP regulation via on‐switch with excitation of 250−330 nm light and off‐switch with 350−380 nm, and the “turn‐on” behavior can be attributed to the advance of Förster resonance energy transfer‐assisted intersystem crossing (ISC) process while “turn‐off” process due to the transformation from H3‐TPB cations to H3‐TPB· radicals. Complex 2 exhibits photoswitchable RTP accompanied with reversible photochromism by leveraging the self‐absorption and RTP emission. Two demos based on the above compounds are further applied to demonstrate the application in information recording and encryption fields. This work supplies a strategy toward the design of switchable RTP systems using electron transfer photochromism, shedding light on broadening the frontiers of photoresponsive materials.

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Section: Introductionmentioning

confidence: 99%

Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Feng

et al. 2023

Adv Funct Materials

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“…The lifetime of Ag 6 –NCs/NMP/H 2 O powder at f NMP = 90% was 11.77 μs, 21 times longer than that of Ag 6 –NCs, with a QY of 17.6%, 7.7 times higher than Ag 6 –NCs (Table and Figure e). The microsecond lifetime and large Stokes shift of Ag 6 –NCs/NMP/H 2 O powder indicated that its luminescence is essentially phosphorescence emission …”

Section: Resultsmentioning

confidence: 99%

Solvent-Induced Self-Assembly of Silver Nanoclusters for White-Light-Emitting Diodes and Temperature Sensing

Xie,

Wang,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Silver nanoclusters (Ag NCs), as a kind of luminescent material, have been widely studied due to their advantages of precise atomic structure, low toxicity, excellent photostability, and biocompatibility. However, studies on the preparation of hydrophilic Ag NCs with a strong fluorescence intensity and high quantum yield (QY) are rare. In this study, the atomically precise Ag NCs with six silver atoms as core (Ag 6 −NCs) were self-assembled under the induction of a good solvent (water) and a poor solvent N-methyl-2-pyrrolidone (NMP). By limiting the rotation and vibration of Ag 6 −NCs ligands, and accompanied by the ligand-to-metal charge transfer (LMCT), aggregation-induced emission (AIE) occurred, and the strong fluorescence emission of Ag 6 −NCs/NMP/H 2 O assembly was realized through solvophobic interactions and noncovalent interactions, such as hydrogen-bonding interactions and π−π staking. Compared with the original Ag 6 −NCs, the fluorescence lifetime of Ag 6 −NCs/NMP/H 2 O was extended from 0.56 to 11.77 μs, the QY was increased from 2.3 to 17.6%, and its photoluminescence (PL) intensity was enhanced 37-fold to the order of 10 7 . Long lifetime and large Stokes shift (∼165 nm) indicate that the Ag 6 −NCs/NMP/H 2 O assembly was a phosphorescent emitter. This research demonstrates that the excellent optical properties and regular response to temperature of the Ag 6 −NCs/NMP/H 2 O assembly make it possible to fabricate white-light-emitting diodes (WLEDs) or temperature sensing materials.

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“…On the one hand, they can increase the spin–orbit coupling of the system through the heavy-atom effect to promote the efficiency of intersystem crossing from the singlet to the triplet state. On the other hand, they can restrict the vibration and rotation of the molecule through coordination interactions to suppress the nonradiative transition of the triplet excitons. , Despite this, there are limited reports on functional MOF materials that integrate LPL and the stimulus response.…”

Section: Introductionmentioning

confidence: 99%

Reversible Acid–Base Long Persistent Luminescence Switch Based on Amino-Functionalized Metal–Organic Frameworks

Wang,

Chen,

Wang

et al. 2024

Inorg. Chem.

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Metal−organic frameworks (MOFs) with long persistent luminescence (LPL) have attracted extensive research attention from researchers due to their potential applications in information encryption, anticounterfeiting technology, and security logic. In contrast to short-lived fluorescent materials, LPL materials offer a visible response that can be easily distinguished by the naked eye, thereby facilitating a much clearer visualization. However, there are few reports on functional LPL MOF materials as probes. In this article, two amino-functional LPL MOFs (VB4−2D and VB4−1D) were synthesized. They both exhibited adjustable fluorescence and phosphorescence from blue to green and from cyan to green, respectively. Notably, the MOFs emitted bright and adjustable LPL upon the removal of the different radiation sources. The basic amino functional groups in the MOFs exhibited acid and ammonia sensitivity, and fluorescence and phosphorescence emission intensities can be burst and restored in two atmospheres, respectively, which can be cycled multiple times. Furthermore, LPL intensity undergoes switching between two different conditions as well, which can be visually discerned by the naked eye, enabling visual sensing of volatiles by LPL. This combination of photoluminescence and the visual LPL switching behavior of acids and bases in functional MOFs may provide an effective avenue for stimulus response, anticounterfeiting, and encryption applications.

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White Light and Color‐Tuning Long Persistent Luminescence from Metal Halide Based Metal‐Organic Frameworks

Cited by 29 publications

References 25 publications

Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Light‐Induced Electron Transfer Toward On/Off Room Temperature Phosphorescence in Two Photochromic Coordination Polymers

Solvent-Induced Self-Assembly of Silver Nanoclusters for White-Light-Emitting Diodes and Temperature Sensing

Reversible Acid–Base Long Persistent Luminescence Switch Based on Amino-Functionalized Metal–Organic Frameworks

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