How to improve circularly polarized luminescence dissymétrie factor?
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To enhance the circularly polarized luminescence (CPL) dissymmetry factor, strategies such as tuning molecular rigidity, enhancing intermolecular interactions, and regulating transition dipole moments have been proposed in recent research. By designing chiral materials with high CPL activities, like double π-helix structures or CPL-active metal-organic frameworks, significant improvements in dissymmetry factors have been achieved . Additionally, the incorporation of Si-heteroannulation in CPL emitters has shown promising results in boosting dissymmetry factors and photoluminescence quantum yields . Furthermore, constructing chiral exciplex systems with a chiral electron acceptor and a regular achiral donor has demonstrated high CPL dissymmetry factors in both photoluminescence and electroluminescence, offering a novel approach to improving CPL performance . These findings collectively contribute to advancing the development of high-performance circularly polarized luminescent materials.
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2 Citations | Enhance circularly polarized luminescence dissymmetry factor by integrating a double π-helix and Si-heteroannulation, achieving high luminescence dissymmetry factor and photoluminescence quantum yield. |
5 Citations | Constructing chiral exciplex systems with a chiral acceptor and achiral donor can enhance circularly polarized luminescence dissymmetry factor by achieving comparable electric and magnetic transition dipole moments. |
| To enhance circularly polarized luminescence dissymmetry factor, modify ligands (e.g., from methyl to ethyl groups) and introduce non-luminescent halogenated aromatics or encapsulate molecules, as demonstrated in the study. | |
21 Mar 2023 | To enhance circularly polarized luminescence dissymmetry factor, restrict molecular motions by increasing intramolecular rigidity and enhancing intermolecular interactions, as demonstrated in the study on bidibenzo[b,d]furan scaffold. |
30 Citations | To enhance circularly polarized luminescence dissymmetry factor, utilize a double π-helix with high barriers for racemization and nitrogen heteroannulation to modulate photoluminescence quantum yield, as demonstrated in the study. |
Related Questions
What is circularly polarized luminescence?5 answersCircularly polarized luminescence (CPL) refers to the emission of light where the electromagnetic waves oscillate in a helical pattern, with the electric field rotating as the light propagates. This phenomenon has been extensively studied in both organic and inorganic materials. Organic CPL-active molecular emitters are synthesized from cyclic(alkyl)(amino) carbenes, exhibiting through-space arene-arene π-delocalization and rapid intramolecular inter-system crossing due to their helical character. In contrast, rare-earth nanowires with intrinsic atomic chirality demonstrate color-tunable CPL emissions, offering thermal stability and potential applications in optoelectronic devices. Additionally, chiral inorganic compounds like (R,R/S,S-DCDA)3Sb2Cl12 exhibit efficient broadband CPL with tunable emission wavelengths, showcasing potential as responsive light sources and PL thermometers. The field of CPL continues to evolve, with advancements in measurement techniques for accurate and fast acquisition of CPL spectra.
What is circularly polarised luminescence?4 answersCircularly polarized luminescence (CPL) refers to the emission of light with a specific polarization state, where the electric field vector of the emitted light rotates in a circular manner. CPL has been extensively studied in both organic and inorganic materials. In organic systems, CPL-active molecular emitters with dynamic propeller-like luminophores have been prepared from cyclic(alkyl)(amino) carbenes (CAACs). Inorganic rare-earth nanowires have also been developed, which exhibit robust and color-tunable CPL emissions. Additionally, CPL has been observed in trans-1,2-di(1-pyrenylamino)cycloxexane, where it is attributed to charge separation symmetry breaking. CPL materials, including polymers, have shown promise for various applications such as organic light-emitting diodes (OLEDs) and chiral sensing. To measure CPL, spectrophotometers using cameras as detectors and space polarization splitting have been developed, allowing for accurate CPL spectra without the need for complex calibration procedures.
How to realize polarization photodetection?4 answersPolarization photodetection can be achieved using various methods. One approach is to use semiconductors with anisotropic geometry or crystal arrangement, such as semiconductor nanowires and 2D materials. Another method involves utilizing topological phenomena, such as the optical Tamm state, in devices based on 2D materials like graphene. Symmetry modulation by heterogeneously integrating large-sized single crystals with other materials, like silicon wafers, can also enable polarization-sensitive photodetection. Additionally, polarization-dependent electric field enhancement can be achieved by combining semiconducting monolayers with polarization-sensitive plasmonic structures. Furthermore, high polarization sensitivity can be realized in photodetectors using single-crystalline 2D/3D perovskite heterostructures, which exhibit ultrahigh polarization selectivity. These different approaches provide a range of options for realizing polarization photodetection in various applications.
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What is circularly polarized Raman used for?5 answersCircularly polarized Raman spectroscopy (CP-Raman) is used for various applications. It has been shown to have unique characteristics compared to linear polarization, allowing for the resolution of vibrational mode symmetry and enhancement of vibrational contrast based on symmetry selectivity. CP-Raman can be used to determine the depolarization ratio and identify overlapping Raman bands, providing more detailed spectroscopic analysis. Additionally, CP-Raman can be used to characterize the excitonic nature and evaluate the relative contribution of electron/exciton-phonon interactions in two-dimensional transition-metal dichalcogenides (TMDCs). CP-Raman has also been used in the development of Raman optical activity (ROA)-circularly polarized luminescence (CPL) spectroscopy, which is useful for measuring weak lanthanide luminescence with circular polarization and examining the structure of biomolecules. Overall, CP-Raman has potential applications in improving chemical selectivity, imaging contrast, spectral resolution, and structural studies.
The structure of transition metal coordination complexes based circularly polarized luminiscence materials ?2 answersCircularly polarized luminescence (CPL) materials based on transition metal coordination complexes have been extensively studied. Chiral metal–organic materials (MOMs) are particularly significant in this field, as they combine coordination-bonded metal centers and organic ligands, allowing for the design of novel structures with molecular or supramolecular-leveled chirality. These chiral MOMs can exhibit CPL properties through strategies such as controlled self-assembly, aggregation of luminogens, charge transfer, and energy transfer. The development and applications of CPL-active aggregates based on metal-ligand coordination materials, known as coordination aggregates, have also been explored. These aggregates include small-molecular metal complexes, metal-ligand coordination helicates, polymers, and frameworks. Additionally, lanthanide complexes have been used in CPL-contrast imaging and as CPL probes. The dissymmetry factor and luminescence efficiency of CPL-active materials are important factors that have been investigated. Overall, there is ongoing research in this field to enhance the dissymmetry factor and luminescent efficiency of CPL materials.