A Single‐Benzene‐Based Fluorophore: Optical Waveguiding in the Crystal Form

Abstract

A single‐benzene‐based, blue‐emissive diethyl 2,5‐dihydroxyterephthalate (DDT) was prepared by Fischer esterification of 2,5‐dihydroxyterephthalic acid (DHT) and ethanol. The strong fluorescence in both the solution and the solid state from such a simple framework stemmed from the push‐pull structure of the electron‐donating hydroxy groups and the accepting carbonyl groups, as well as structural planarity from intramolecular hydrogen bonds. The strong intermolecular hydrogen bonds enabled DDT to crystallize easily. The color CCD imaging technique showed efficient 1D optical waveguiding with a large optical loss coefficient of 0.15 dB/μm. DDT has potential application in optical sensors, photonic devices, and optoelectronic communication, because of its highly ordered structure and light‐emitting ability.

Fine Fabrication and Optical Waveguide Characteristics of Hexagonal tris(8-hydroxyquinoline)aluminum(Ⅲ) (Alq3) Crystal

“…From the calculation of the intensity of main PL peaks, the average decay constant for the Alq 3 MCs was estimated to be 0.381 dB/µm. Considering that the propagated optical signal was measured, we suggested that they are a good candidate for potential materials for application in the development of optical communication devices [33,34].…”

A water-soluble copper-immobilized covalent organic framework functioning as an “OFF–ON” fluorescent sensor for amino acids

“…A 100 mL two-neck round-bottom flask was charged with 2,5-dihydroxy-1,4-benzenedicarboxylic acid diethyl ester 68 (2.00 g, 7.86 mmol), EtOH (80 mL), and hydrazine hydrate (10 mL). The mixture was heated under reflux at 90 1C for 20 h, forming a large amount of a pale-yellow precipitate.…”

Micromanipulation of Mechanically Compliant Organic Single‐Crystal Optical Microwaveguides

“…One of the currently most active research directions in the field of adaptive organic crystals is exploring their potentials for application as optical waveguides for passive or active transduction of visible or near‐infrared light at the microscale. The optical waveguiding properties can be readily characterized for organic crystals that are centimeters to millimeters in length.…”

“…The optical waveguiding properties can be readily characterized for organic crystals that are centimeters to millimeters in length. It has been already demonstrated that owing to their high refractive indices (1.6–1.8) single‐component and hybrid organic crystals can be used as transducers of light. Some of these macroscopic crystal waveguides can be deformed—either mechanically, by applying force, or photochemically, by using ultraviolet light—to attain spatial control over their light output .…”

“…[29][30][31][32] One of the currently most active research directions in the field of adaptive organic crystals is exploring their potentials for application as optical waveguides for passive or active transduction of visible or near-infrared light at the microscale.The optical waveguiding properties can be readily characterized for organic crystals that are centimeters to millimeters in length. It has been already demonstrated that owing to their high refractive indices (1.6-1.8) single-component [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] and hybrid [50,51,59] organic crystals can be used as transducers of light. Some of these macroscopic crystal waveguides can be deformed-either mechanically,byapplying force,o rp hotochemically,b yu sing ultraviolet light-to attain spatial control over their light output.…”