Controllable Synthesis of Organic Microcrystals with Tunable Emission Color and Morphology Based on Molecular Packing Mode

Organic microcrystals are of essential importance for high fluorescence efficiency, ordered molecular packing mode, minimized defects, and smooth shapes, which are extensively applied in organic optoelectronics. The molecular packing mode significantly influences the optical/electrical properties of...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2018-01, Vol.14 (1), p.n/a
Main Authors: Li, Zhi‐Zhou, Liao, Liang‐Sheng, Wang, Xue‐Dong
Format: Article
Language:English
Subjects:
Alpha rays
Color
Decay rate
Electrical properties
Evaporation rate
Fluorescence
growth morphology
Microcrystals
molecular packing mode
Morphology
Nanotechnology
Optical properties
Optoelectronics
organic microcrystals
self‐assembly
Stability
Staking
tunable emission color
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Summary:Organic microcrystals are of essential importance for high fluorescence efficiency, ordered molecular packing mode, minimized defects, and smooth shapes, which are extensively applied in organic optoelectronics. The molecular packing mode significantly influences the optical/electrical properties of organic microcrystals, which makes the controllable preparation of organic microcrystals with desired molecular packing mode extremely important. In the study, yellow‐emissive α phase organic microcrystals with rectangular morphology and green‐emissive β phase perylene microcrystals with rhombic morphology are separately prepared by simply controlling the solution concentration. The distinct molecular staking modes of the H/J‐aggregate are found in these two types of perylene microcrystals, which contribute to the different emission color, morphology, and radiative decay rate. What is more interesting, the α‐doped β phase and the β‐doped α phase organic microcrystals can also be fabricated by modulating the evaporation rate from 100 to 10 µL min−1. The findings can contribute to the future development of organic optoelectronics at the microscale. Perylene organic microcrystals with tunable emission color and morphology are achieved by simply controlling the concentration of the perylene solution and the evaporation rate. Specifically, α phase, β phase, α‐doped β phase, and β‐doped α phase organic microcrystals are obtained, whose different optical properties are attributed to significantly different molecular packing modes.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201702952