Time-resolved fluorescence measurements on solutions of dimethyl-2,6-naphthalenedicarboxylate

Spies, C.; Gehrke, Rainer

doi:10.1016/s0022-2313(99)00054-x

Cited by 6 publications

(19 citation statements)

References 16 publications

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“…Based on our reported assignment, the 2.9 and 11.2 ns components are attributed to the lifetimes of naphthalene monomer and excimer‐like species, respectively. It is well known that naphthalene molecules exhibit long lifetimes (15–30 ns) due to excimers emission in high concentrated solutions or in polymeric matrixes . The 610 ps component, having the largest contribution, is attributed to the decay of different populations of linkers in a monomer‐like environment.…”

Section: Resultsmentioning

confidence: 99%

New OLEDs Based on Zirconium Metal‐Organic Framework

Gutiérrez

Martín

Kennes

et al. 2018

Advanced Optical Materials

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The search for new smart‐materials in solid‐state light‐emitting applications, like hybrid organic–inorganic light‐emitting devices (OLEDs), has seen an intense growth in the recent years. Among all the possibilities, metal‐organic frameworks (MOFs) have emerged as promising smart materials due to their chemical and structural properties. Herein, for the first time, the use of a Zr‐based MOF (Zr‐NDC, NDC = dimethyl 2,6‐naphthalenedicarboxylate) as electroluminescent active material in OLED devices is reported. The results indicate that, independently of the properties of the polymer used to form the emissive layer, the OLED emission is due to radiative electron and hole recombination in the MOF. A tuning of the optoelectronic properties of the device by incorporating Coumarin 153, (C153) and 4‐(Dicyanomethylene)‐2‐methyl‐6‐(4‐dimethylaminostyryl)‐4H‐pyran, into the MOF pores is demonstrated. Using different MOFLED architectures, and MOF composition, it is possible to elucidate the photoluminescence and electroluminescence mechanisms, providing the clues for further improvements. It is observed that the current density as well as the electroluminescent behavior depends on the dopant fluorophores. It is also shown that defects within the Zr‐MOF play a role in the OLED optoelectronic properties. The results clearly demonstrate the potential of MOFs as new tunable electroluminescent materials for OLED applications.

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Section: Resultsmentioning

confidence: 99%

New OLEDs Based on Zirconium Metal‐Organic Framework

Gutiérrez

Martín

Kennes

et al. 2018

Advanced Optical Materials

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“…[11] The fluorescence lifetime measured at 15 8C is 12.7 ns. [11] With increasing concentration excimer formation of DMN molecules is observed by an increasing fluorescence intensity in the long wavelengths range (curve d). The recorded fluorescence decay curves are double exponential and follow Birks kinetics model.…”

Section: Resultsmentioning

confidence: 98%

“…The recorded fluorescence decay curves are double exponential and follow Birks kinetics model. [11,23] The two fluorescence decay times of a 2.5 Â 10 À2 M DMN solution at 15 8C are 10 and 18 ns. This is the DMN concentration which is realized in the more highly concentrated mixture.…”

Section: Resultsmentioning

confidence: 99%

“…2,6-naphthoate was chosen because the excimer [9][10][11][12] and ground-state stable dimer [13] formation of dimethyl-2,6-naphthalenedicarboxylate is well characterized. In this paper we will also report on the fluorescence of 2,6-naphthoate and N-(4-carboxyphenyl)trimellitimide containing aromatic ester groups, analogous to certain copoly(ester-imide)s. [2] The fluorescence behavior of the model substances is analyzed and compared with the fluorescence of the copoly(ester-imide).…”

Section: Introductionmentioning

confidence: 99%

“…Intermolecular complex formation is caused by interactions between sandwich like arrangements of aromatic rings, which supposedly take place between different chains, or when a chain forms a loop. 2,6‐naphthoate was chosen because the excimer9–12 and ground‐state stable dimer13 formation of dimethyl‐2,6‐naphthalenedicarboxylate is well characterized. In this paper we will also report on the fluorescence of 2,6‐naphthoate and N ‐(4‐carboxyphenyl)trimellitimide containing aromatic ester groups, analogous to certain copoly(ester‐imide)s 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluorescence of Copoly(ester‐imide)s Containing 2,6‐Naphthoate Units

Spies

Lorenc

Gehrke

et al. 2003

Macro Chemistry & Physics

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The intrinsic fluorescence of copoly(ester‐imide)s is used to obtain information about the existence of sandwich like arrangement of aromatic units. The copoly(ester‐imide) investigated herein contains tert‐butylhydroquinone, N‐(4‐carboxyphenyl)trimellitimide and 2,6‐naphthoate moieties. Depending on the excitation wavelength, different sandwich like arrangements are observed by the change of the fluorescence. Identification of the different interacting units was performed by comparing the copoly(ester‐imide) fluorescence with the fluorescence of different low molecular weight model substances representing different parts of the polymer chain. Ground‐state stable dimer formation between the imide parts and the naphthoate moieties, as well as mixed ground‐state stable complex formation between these parts was observed. All measurements were performed in 1,1,1,3,3,3‐hexafluoro‐2‐propanol (HFIP) solutions.

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Competitive Excimer Formation and Energy Transfer in Zr‐Based Heterolinker Metal–Organic Frameworks

Gutiérrez

Sánchez

Douhal

2016

Chemistry A European J

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The spectroscopy and dynamics of a series of Zr-based MOFs in dichloromethane suspension are reported. These Zr-NADC MOFs were constructed by using different mixtures of 2,6-naphthalenedicarboxylate (NDC) and 4-amino-2,6-naphthalenedicarboxylate (NADC) as organic linkers. The fraction of NADC relative to NDC in these heterolinker MOFs ranges from 2 to 35 %. The results indicate two competitive photoprocesses: NDC excimer formation and an energy transfer (ET) from excited NDC linkers to NADC linkers. Increasing the fraction of NADC linkers in the Zr-NADC nanostructure decreases the mean time constant of NDC excimer formation, while the NADC emission intensity experiences a drop at the highest fraction of this linker in the MOF. The first observation is explained by an increase in the energy-transfer probability between the two linkers, and the second by emission quenching in the NADC linkers due to ultrafast charge transfer assisted by the amino group. Femtosecond time-resolved emission studies showed that the ET process (recorded as decaying and rising components) from excited NDC to NADC takes place in 1.2 ps. Direct excitation of the NADC linkers (at 410 nm) shows a decaying, but not rising, component of 250-480 fs, which could reflect the formation of a nonemissive charge-separation state. The results show that by using MOFs having heterolinkers it is possible to trigger and tune excimer formation and ET processes.

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Time-resolved fluorescence measurements on solutions of dimethyl-2,6-naphthalenedicarboxylate

Cited by 6 publications

References 16 publications

New OLEDs Based on Zirconium Metal‐Organic Framework

New OLEDs Based on Zirconium Metal‐Organic Framework

Fluorescence of Copoly(ester‐imide)s Containing 2,6‐Naphthoate Units

Competitive Excimer Formation and Energy Transfer in Zr‐Based Heterolinker Metal–Organic Frameworks

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