Journal
ORGANIC ELECTRONICS
Volume 15, Issue 10, Pages 2264-2269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.06.032
Keywords
Photochromism; Diarylethene; Hole mobility; Photo isomerization; Amorphous film
Funding
- JSPS KAKENHI [23350066]
- Grants-in-Aid for Scientific Research [26107012, 26630349] Funding Source: KAKEN
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Photochromic diarylethenes (DAEs) have gained attention as attractive current switching materials by light irradiation in the organic electronics field. We investigated the hole mobility of amorphous films consisting of three types of DAEs using a space-charge-limited current method and a better chemical structure to achieve high mobility. The hole mobility of open-ring (colorless) DAE having benzothiophene rings substituted with triphenylamine (TPA) as an aryl group was 2 x 10(4) times (2 x 10(-6) cm(2)/V s) larger than that of DAE containing thiophene rings without TPA. When the DAE film was irradiated with ultraviolet (UV) light, the hole mobility decreased temporarily at 4% of closed-ring (colored) isomers and then increased to two-three times of the initial colorless state at 85% of the closed-ring isomers. The temporary decrease in the hole mobility originated in the hole trapping effect of the closed-ring molecules in a matrix consisting of open-ring isomers. (C) 2014 Elsevier B.V. All rights reserved.
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