Issue 40, 2012
From the journal:

Journal of Materials Chemistry

Simultaneous enhancement of the carrier mobility and luminous efficiency through thermal annealing a molecular glass material and device

Shanfeng Xue,a   Liang Yao,a   Suijun Liu,a   Cheng Gu,a   Fangzhong Shen,a   Weijun Li,a   Hui Zheng,a   Hongbin Wub  and  Yuguang Ma*a  

* Corresponding authors

a State Key Lab of Supramolecular Structure and Materials, Jilin University, 2699 Qianjin Avenue, Changchun, 130012, P. R. China
E-mail: ygma@jlu.edu.cn
Fax: +86 431-85168480
Tel: +86 431-85168480

b State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China

Abstract

The molecule 2,5,2′,5′-tetrakis(2,2-diphenylvinyl)biphenyl (TDPVBi) shows excellent solubility in organic solvents, a fully amorphous (glass state) property and strong blue emission in the solid state, endowing it with potential to fabricate solution-processed small-molecular devices. To further improve the quality of TDPVBi films, thermal annealing of method was performed for the pristine films, as prepared from solution, and proved to be an efficient way to repair the defects (e.g. pinhole) that exist in the pristine films. It is found that the films tend to become compact with level surface morphology after thermal annealing at a temperature around their glass transition temperature (Tg). The device characteristics show that thermal annealing induces a simultaneous enhancement of the hole mobility and luminous efficiency. The luminous efficiency reaches 4.60 cd A−1 (corresponding external quantum efficiency of ∼3.0%) after thermal annealing at a temperature of 120 °C, which is double that of the device without annealing.

Graphical abstract: Simultaneous enhancement of the carrier mobility and luminous efficiency through thermal annealing a molecular glass material and device

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Article information

DOI
https://doi.org/10.1039/C2JM34663J
Article type
Paper
Submitted
16 Jul 2012
Accepted
31 Aug 2012
First published
31 Aug 2012

J. Mater. Chem., 2012,22, 21502-21506

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Simultaneous enhancement of the carrier mobility and luminous efficiency through thermal annealing a molecular glass material and device

S. Xue, L. Yao, S. Liu, C. Gu, F. Shen, W. Li, H. Zheng, H. Wu and Y. Ma, J. Mater. Chem., 2012, 22, 21502 DOI: 10.1039/C2JM34663J

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