Issue 1, 2010
From the journal:

Journal of Materials Chemistry

Rubrene micro-crystals from solution routes: their crystallography, morphology and optical properties†

Liwei Huang,ab   Qing Liao,b   Qiang Shi,b   Hongbing Fu,*b   Jinshi Mab  and  Jiannian Yao*b  

* Corresponding authors

a State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China
E-mail: hongbing.fu@iccas.ac.cn, jnyao@iccas.ac.cn
Fax: +86-10-82616517
Tel: +86-10-82616517

b Graduate School of Chinese Academy of Sciences, Beijing, P. R. China

Abstract

A series of rubrene micro-crystals (MCs) with controllable sizes and shapes, ranging from one-dimensional (1D) ribbons to 2D rhombic and hexagonal plates, have bee prepared by employing the reprecipitation method. Based on X-ray diffraction analysis, the crystal structures of 1D ribbons and 2D plates have been identified to be triclinic and monoclinic phases, respectively, rather than the commonly reported orthorhombic phase for vacuum-deposited rubrene crystals. In our system, adjustment of the monomer concentration of rubrene, which in turn determines the supersaturation (β) for crystallization, paved the way for kinetic control over the nucleation and growth processes. Combining with theoretical calculations, we found that transformation from a triclinic phase at low supersaturation to a monoclinic phase at high supersaturation was responsible for the morphology change from 1D ribbons to 2D plates. Both ensemble and single-particle spectroscopy clarifies that 1D ribbons and 2D plates show distinct optical properties, probably related to their different solid-state structures in triclinic and monoclinic crystals. Moreover, scanning near-field optical microscopy reveals that the ribbons show waveguiding along a 1D direction, and the plates in a 2D plane.

Graphical abstract: Rubrene micro-crystals from solution routes: their crystallography, morphology and optical properties

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Article information

DOI
https://doi.org/10.1039/B914334C
Article type
Paper
Submitted
16 Jul 2009
Accepted
11 Sep 2009
First published
06 Oct 2009

J. Mater. Chem., 2010,20, 159-166

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Rubrene micro-crystals from solution routes: their crystallography, morphology and optical properties

L. Huang, Q. Liao, Q. Shi, H. Fu, J. Ma and J. Yao, J. Mater. Chem., 2010, 20, 159 DOI: 10.1039/B914334C

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