Is there any strategies that can reduce FWHM of photoluminescence of organic materials using intermolecular interactions? 

Yes, several strategies leveraging intermolecular interactions can effectively reduce the full width at half maximum (FWHM) of photoluminescence in organic materials, as evidenced by recent research findings. One approach involves the development of double boron-based emitters with polycyclic heteraborin skeletons, which have shown to achieve extremely narrow FWHM in their emission spectra due to the role-play of the highest occupied molecular orbital (HOMO) energy levels, leading to high color fidelity and efficiency in organic light-emitting diodes (OLEDs) . Additionally, the suppression of molecular vibration through intermolecular hydrogen bonding has been demonstrated to enhance fluorescence quantum yield, which indirectly influences the FWHM by stabilizing the emission characteristics . The design of organic smart fluorophores (OSFs) by balancing the competition between intermolecular interactions and external stimuli via molecular structure design has also been shown to result in tunable photophysical properties, including the potential for reduced FWHM through controlled molecular packing and stimuli-responsive properties . Furthermore, the use of supramolecular complex strategies based on high-efficiency emitting derivatives allows for fine-tuning of emission color and FWHM through different co-former compositions and stacking modes in the crystal, highlighting the role of excited-state characteristics in achieving desired luminescence properties . Moreover, embedding thermally activated delayed fluorescence (TADF) chromophores into the backbone of polymers, thereby suppressing intra- and interchain interactions, has been effective in reducing efficiency roll-offs and potentially influencing FWHM by maintaining high photoluminescence quantum yield . Lastly, chemical modifications of molecules to balance intersystem crossing and fluorescence rates have been explored, with electron donating groups actively restraining fluorescence for efficient ISC to the triplet manifold, which could impact the FWHM of emission . These strategies underscore the significance of intermolecular interactions and molecular design in refining the photoluminescence properties of organic materials, including the reduction of FWHM for enhanced performance in various applications.

Promoting Intersystem Crossing of a Fluorescent Molecule via Single Functional Group Modification.

Not addressed in the paper.

Improving Luminescent Performances of Thermally Activated Delayed Fluorescence Conjugated Polymer by Inhibiting the Intra- and Interchain Quenching

Embedding TADF chromophores into conjugated polymer backbones with "blocking segments" can inhibit intra- and interchain interactions, reducing FWHM of photoluminescence in organic materials.

Magnetophotoluminescence line-shape narrowing through interactions between excited states in organic semiconducting materials

Intermolecular interactions between excited states can reduce the full width at half maximum (FWHM) of photoluminescence in organic materials, leading to line-shape narrowing and decreased spin-exchange interactions.

Suppressing exciton deconfinement and dissociation for efficient thermally activated delayed fluorescence OLEDs

Suppressing exciton deconfinement and dissociation through appropriate host materials can reduce the full width at half maximum (FWHM) of photoluminescence in organic materials by controlling intermolecular interactions.

Hydrogen-Bonding-Mediated Molecular Vibrational Suppression for Enhancing the Fluorescence Quantum Yield Applicable for Visual Phenol Detection.

Hydrogen bonding-mediated suppression of molecular vibrations can enhance fluorescence quantum yield, reducing the full width at half maximum (FWHM) of photoluminescence in organic materials through intermolecular interactions.

Supramolecular complex strategy for pure organic multi-color luminescent materials and stimuli-responsive luminescence switching

The supramolecular complex strategy in the paper can tune emission color but doesn't specifically address reducing FWHM of photoluminescence in organic materials through intermolecular interactions.

Achieving Organic Smart Fluorophores by Controlling the Balance between Intermolecular Interactions and External Stimuli.

Balancing intermolecular interactions and external stimuli in organic smart fluorophores can reduce the full width at half maximum (FWHM) of photoluminescence in organic materials.

Guest Molecules with Amino and Sulfhydryl Groups Enhance Photoluminescence by Reducing the Intermolecular Ligand-To-Metal Charge Transfer Process of Metal–Organic Frameworks

Organic molecules with amino and sulfhydryl groups can reduce the full width at half maximum (FWHM) of photoluminescence by inhibiting intermolecular ligand-to-metal charge transfer (LMCT) processes in metal-organic frameworks.

Tailoring Extremely Narrow FWHM in Hypsochromic and Bathochromic Shift of Polycyclo-Heteraborin MR-TADF Materials for High-Performance OLEDs.

The paper presents a strategy utilizing molecular orbital energy levels to achieve extremely narrow FWHM in hypsochromic and bathochromic shifted emissions of organic materials, enhancing OLED performance.

Effects of Intermolecular Interactions on Luminescence Property in Organic Molecules

Intermolecular interactions can influence the Full Width at Half Maximum (FWHM) of photoluminescence in organic materials by altering excited-state properties, potentially reducing FWHM through strategic design.