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Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Published on: February 27, 2019

Emissive organic crystals and device applications.

Shuai Zhao^1,2, Xue-Dong Wang², Hongbing Fu^3,4

¹School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China.

Chemical Society Reviews

|March 25, 2026

Summary

Emissive organic crystals merge crystalline order with high-efficiency light emission. This review covers design, mechanisms like aggregation-induced emission, and applications in advanced optoelectronics.

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Area of Science:

Materials Science
Optoelectronics
Solid-State Physics

Background:

Emissive organic crystals offer unique optoelectronic properties by combining crystalline order with efficient light emission.
Key photophysical mechanisms driving emission include aggregation-induced emission, thermally activated delayed fluorescence, and room-temperature phosphorescence.

Purpose of the Study:

To provide a comprehensive review of the rapidly advancing field of emissive organic crystals.
To discuss fundamental principles, advanced engineering, and device applications.
To outline current challenges and future opportunities in next-generation photoelectronic technologies.

Main Methods:

Surveying fundamental molecular design principles and photophysical mechanisms.
Analyzing advanced engineering of crystal packing and morphology.
Elaborating on light-matter interactions and device integration.

Main Results:

Detailed discussion of photophysical mechanisms like AIE, TADF, and RTP in organic crystals.
Exploration of crystal engineering for tailored optical properties and light-matter interactions.
Highlighting progress in device applications including OLEDs, sensors, and display arrays.

Conclusions:

Emissive organic crystals are a promising platform for next-generation optoelectronic devices.
Further research into molecular design, crystal engineering, and device integration is crucial.
Significant opportunities exist for advancing photoelectronic technologies using these materials.