Control of Fluorescence of Organic Dyes in the Solid-State by Supramolecular Interactions

Traven, V. F.; Cheptsov, Dmitrii A.; Lodeiro, Carlos

doi:10.1007/s10895-022-03056-4

Cited by 11 publications

(4 citation statements)

References 198 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The emitters in the solid state have a high probability of a stronger intermolecular interaction, which is quite different from the minimal interaction in a less concentrated solution state (∼10 –5 M), which will lead to distinct photophysical properties between these two states. ,− Most of the emitting materials utilized in OLED devices possess aggregation via strong intermolecular interactions in neat film conditions that often led to concentration quenching resulting in lowering the emission quantum yield. Hence, low wt % emitting materials are typically dispersed in a suitable host matrix to suppress the quenching possibilities and improve the emission quantum yield. − In some materials with the AIE phenomenon, the emission quantum yield is improved in the neat film state compared with the less concentrated state. , As displayed in Figure S6, the fluorophores in the highly concentrated neat film state possess possible intermolecular interactions that led to the aggregated state.…”

Section: Resultsmentioning

confidence: 99%

Impact of Electron-Donating Groups on Attaining Dual-Emitting Imidazole-Based Donor–Acceptor Materials

Ganesan

Zhang

et al. 2023

J. Org. Chem.

View full text Add to dashboard Cite

Imidazole-based donor–acceptor materials are well known for their polarity-controlled trade-off phenomenon between the localized excitation-based short-wavelength (SW) emission in nonpolar solvents and charge transfer dominated long-wavelength (LW) emission in polar solvents. To attain concurrent SW- and LW-based dual-emission characteristics, a series of imidazole-based donor–acceptor fluorophores (CBImDCN, TPImDCN, PZImDCN) possessing different electron-donating groups such as carbazole, triphenylamine, and phenothiazine linked via the N-position of the imidazole core unit were synthesized and verified by NMR and mass spectroscopic techniques. As a result, the strong donating TPImDCN and PZImDCN exhibited dual emission in different solvents of varying polarity, covering the blue (SW) and green/orange (LW) regions. On the other hand, in contrast, only an SW emission band is observed with the weak donating CBImDCN. Moreover, PZImDCN shows panchromatic emission under 365 nm illumination, while only orange color emission is observed under visible light excitation, revealing two different origins of SW and LW emissions, as also evidenced from DFT calculations. Overall, this work reveals a new approach for attaining concurrent SW and LW emission characteristics from imidazole-based D–A materials and sheds light on the design and development of novel panchromatic emitters with intriguing properties for lighting and display applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Impact of Electron-Donating Groups on Attaining Dual-Emitting Imidazole-Based Donor–Acceptor Materials

Ganesan

Zhang

et al. 2023

J. Org. Chem.

View full text Add to dashboard Cite

show abstract

“…As shown in Figure a, purified NR-CD powders are surprisingly able to fluoresce in the visible region when observed under UV irradiation; in contrast, the NR dye powder appears completely dark under the same conditions. For molecular dyes, such as NR, fluorescence loss in the solid state can be attributed to a quenching caused by aggregation by π–π stacking of the dye molecules . Indeed, π–π stacking or other weak intermolecular interactions increase the probability of nonradiative recombination pathways from the excited state, thereby causing the fluorescence to be quenched.…”

Section: Resultsmentioning

confidence: 99%

“…For molecular dyes, such as NR, fluorescence loss in the solid state can be attributed to a quenching caused by aggregation by π−π stacking of the dye molecules. 68 Indeed, π−π stacking or other weak intermolecular interactions increase the probability of nonradiative recombination pathways from the excited state, thereby causing the fluorescence to be quenched. Instead, the radiative decay of excited NR fluorophores is still possible in NR-CDs thanks to the presence of the carbogenic matrix that prevents aggregation of NR molecules at the solid state.…”

Section: Resultsmentioning

confidence: 99%

Dye-Derived Red-Emitting Carbon Dots for Lasing and Solid-State Lighting

Madonia,

Minervini,

Terracina

et al. 2023

ACS Nano

View full text Add to dashboard Cite

Carbon dots are carbon-based nanoparticles renowned for their intense light-emitting capabilities covering the whole visible light range. Achieving carbon dots emitting in the red region with high efficiency is extremely relevant due to their huge potential in biological applications and in optoelectronics. Currently, photoluminescence in such an energy interval is often associated with polyheterocyclic molecular domains forming during the synthesis that, however, present low emission efficiency and issues in controlling the optical features. Here, we overcome these problems by solvothermally synthesizing carbon dots starting from Neutral Red, a common red-emitting dye, as a molecular precursor. As a result of the synthesis, such molecular fluorophore is incorporated into a carbonaceous core while retaining its original optical properties. The obtained nanoparticles are highly luminescent in the red region, with a quantum yield comparable to that of the starting dye. Most importantly, the nanoparticle carbogenic matrix protects the Neutral Red molecules from photobleaching under ultraviolet excitation while preventing aggregation-induced quenching, thus allowing solid-state emission. These advantages have been exploited to develop a fluorescence-based color conversion layer by fabricating polymer-based highly concentrated solid-state carbon dot nanocomposites. Finally, the dye-based carbon dots demonstrate both stable Fabry–Perot lasing and efficient random lasing emission in the red region.

show abstract

“…In the last few decades, small organic molecular dyes have proven to be pivotal for a plethora of optical and photonic applications such as organic light emitting diodes, photovoltaics, sensors, dye mediated phototherapeutics, etc. [1][2][3][4][5][6][7][8][9][10] The economies built around these technologies depend heavily on the discovery and development of new dyes for its sustained growth. For example, there is presently a strong demand for organic phosphor-converted (pc) white-light-emitting-diodes (WLED) in the solid-state lighting industry.…”

Section: Introductionmentioning

confidence: 99%

Correlating structure and photophysical properties in thiazolo[5,4-d]thiazole crystal derivatives for use in solid-state photonic and fluorescence-based optical devices

Shibu,

Jones,

Tolley

et al. 2023

Mater. Adv.

View full text Add to dashboard Cite

show abstract

Control of Fluorescence of Organic Dyes in the Solid-State by Supramolecular Interactions

Cited by 11 publications

References 198 publications

Impact of Electron-Donating Groups on Attaining Dual-Emitting Imidazole-Based Donor–Acceptor Materials

Impact of Electron-Donating Groups on Attaining Dual-Emitting Imidazole-Based Donor–Acceptor Materials

Dye-Derived Red-Emitting Carbon Dots for Lasing and Solid-State Lighting

Correlating structure and photophysical properties in thiazolo[5,4-d]thiazole crystal derivatives for use in solid-state photonic and fluorescence-based optical devices

Contact Info

Product

Resources

About