Boosting the Efficiency of Organic Solid‐State Lasers by Solvato‐Tailored Assemblies

Abstract

The photophysical properties of pure organic materials in solid-state are widely related to the crystal's arrangements. Herein, 4,6-bis((E)-4-(dibenzothiophene) styryl)-5(ethoxycarbonyl)-2,2-difluoro-2H-1,3,2-dioxaborinin-1-ium-2-uide (BBSF) is employed as a mode molecule to explore the relationship between molecular arrangement and performance. Three elegant crystals (solventfree-J-aggregation of EA-crystal, solvent-J-aggregations of CB-crystal, and FB-crystal) are obtained by solvato-tailored strategy. Detailed single crystal structures and photophysical data reveal that all the three crystals adopt a J-type aggregation model. EA-crystal does not involve solvent molecular while the CB-and FB-crystals involve chlorobenzene (CB) and fluorobenzene (FB) molecules, respectively. Solvent molecules can effectively separate the two columns of BBSF molecules, resulting in high brightness emission. Laser behaviors indicate that the solvent-microcrystals display higher brightness, lower threshold, as well as higher quality factor than solvent-free-microcrystal due to the weakened bimolecular exciton annihilation process. This strategy not only paves an intriguing way to the construction and preparation of pure organic J-aggregation laser materials but also offers a guideline for suppressing bmEA process through introducing solvent molecules.

Unlocking Multicolor Emissions in the Crystalline State through Dimerization and Configurational Transformation of a Single Fluorophore

“…Organic solid-state emissive materials have found extensive applications, such as light-emitting diodes (LEDs), , solid-state lasers, , optical waveguides, , and luminescent sensors. , Among these materials, those with tunable emissions have garnered increasing attention due to their potential in multicolor displays, multiplexed imaging, information encryption, and anticounterfeiting technologies . However, the rational design of such materials based on a single fluorophore remains a formidable challenge.…”

Low-Temperature-Resistant Elastic Organic Crystals with Variable Amplified Spontaneous Emissions

“…Organic crystals have garnered significant attention owing to their inherent advantages of anisotropic properties and well-ordered packing structures. These distinctive characteristics render them promising candidates for optoelectronic applications, such as organic light-emitting diodes, − organic solid-state lasers, − and optoelectronic resonators. − Nevertheless, the superiority of organic crystals over metal or polymer materials remains a topic of debate among researchers. This divergence in opinion is largely attributed to a critical drawback of crystals, namely, their brittleness.…”

Organic Thermally Activated Delayed Fluorescence Host–Guest Nanoparticles for Super‐Resolution Imaging

“…It has been demonstrated that BBSF molecules possess the merits of excellent SE performance, large Stokes’ shift, and high photostability. [ 28 ] CBP is the most widely used host materials for OLEDs with high crystallization. [ 29 ] We first prepared BBSF@CBP microcrystals with a diameter ≈of 5–8 µm by reprecipitation method.…”