Polymorphism and microcrystal shape dependent luminescence, optical waveguiding and resonator properties of coumarin-153

Abstract

C-153 dye, upon self-assembly in mixed acetonitrile and water solvents formed polymorphic tubes, rods, sheets and Japanese twin tubes displaying molecular packing dependent diverse emission colours and a shape-dependent optical cavity effect.

Probing Optical Anisotropy and Polymorph‐Dependent Photoluminescence in [Ln2] Complexes by Hyperspectral Imaging on Single Crystals

“…In this context, crystal packing and molecular arrangement have been recognized as important aspect fort he designo fi nnovative optical devices. [1][2][3][4][5][6][7][8][9][10] Most of these studies focusingo nc orrelations between crystal packing, polymorphism,a nd optical properties are foundw ithin the field of p-conjugated materials foro ptoelectronicd evices, that is, organic light-emitting diodes (OLEDs), organic thin-filmt ransistors, waveguides,r esonators or solar devices.A lternatively, photoluminescent lanthanide (Ln)-based molecules and materials are highly attractive candidates for opto-magnetic applications spanning the broad range from optical sensors, biomedical probesa nd contrast agents to waveguides, and single-molecule magnets, to name af ew. [11][12][13][14][15][16][17][18][19][20][21][22][23] While significant effect of crystal packing on the optical properties of Ln 3 + -based materials has been shown for coordi-nationp olymers and metal-organicframeworks (MOFs), surprisinglyt his has not yet been exploited in molecular species that exhibit polymorphism.…”

“…Solid‐state light emitting materials are highly sought after when it comes to the development of efficient photonic devices for applications ranging from color‐tunable lighting to opto‐electronic and opto‐magnetic systems. In this context, crystal packing and molecular arrangement have been recognized as important aspect for the design of innovative optical devices . Most of these studies focusing on correlations between crystal packing, polymorphism, and optical properties are found within the field of π‐conjugated materials for opto‐electronic devices, that is, organic light‐emitting diodes (OLEDs), organic thin‐film transistors, waveguides, resonators or solar devices.…”

Naturally and Elastically Bent Organic Polymorphs for Multifunctional Optical Applications

“…Indeed, there are some typical organic solids exhibit polymorph‐dependent luminescent properties and also optical modes. [ 9–12 ] These studies have been mainly focused on tuning the emission color and efficiency of organic solids. The report of organic polymorphs aimed at modifying the mechanical properties is rare.…”

“…Additionally, the application of the naturally bent and elastically bent crystals was evaluated by measuring the optical waveguides and amplified spontaneous emissions (ASE). [ 12,39–41 ] This work aims at not only expounding the importance of crystal engineering in designing flexible crystal but also demonstrating the multifunctional applications of organic crystals as flexible waveguiding and lasing media.…”

Self‐Assembled Organic Crystalline Microring Cavities with High Q‐Factors

“…In recent years, optical microstructures of organic materials have received considerable attention for their potential applications in photonic devices such as optical microcavities, optical waveguides,, lasers, modulators, and filters . Such organic materials can self‐assemble through bottom‐up fabrication carried out chemically and physically .…”