Unusual Side-Chain Effects on Charge-Carrier Lifetime in Discotic Liquid Crystals

被引：17

作者：

Motoyanagi, Jin ^{[2
]}

Yamamoto, Yohei ^{[2
]}

Saeki, Akinori ^{[3
,4
]}

Alam, Md. Akhtarul ^{[2
]}

Kimoto, Atsushi ^{[2
]}

Kosaka, Atsuko ^{[2
]}

Fukushima, Takanori ^{[1
]}

Seki, Shu ^{[3
,4
]}

Tagawa, Seiichi ^{[3
,4
]}

Aida, Takuzo ^{[2
]}

机构：

[1] RIKEN, Adv Sci Inst, Wako, Saitama 3510198, Japan

[2] Natl Museum Emerging Sci & Innovat, Japan Sci & Technol Agcy, ERATO SORST Nanospace Project, Koto Ku, Tokyo 1350064, Japan

[3] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

[4] Osaka Univ, Grad Sch Engn, Osaka 5670047, Japan

来源：

CHEMISTRY-AN ASIAN JOURNAL | 2009年 / 4卷 / 06期

关键词：

conducting materials; liquid crystals; photolysis; semiconductors; transient conductivity; HEXA-PERI-HEXABENZOCORONENE; MOBILITY; SEMICONDUCTORS; ELECTRONICS; SILICA; ALKYL;

D O I：

10.1002/asia.200800481

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

When hexa-peri-hexabenzocoronene (HBC) carries paraffinic side chains with ester-ether termini (1a-1c), a hexagonal columnar liquid-crystalline (LC) mesophase forms, which is characterized by a very wide temperature range (ca. 0-300 degrees C). The LC materials from these HBC derivatives show characteristic electronic properties with an extremely long photocarrier lifetime. For example, by means of a flash-photolysis time-resolved microwave conductivity technique, the photocarrier lifetime, observed for liquid-crystalline la, is as long as 14 ms, which is four-orders of magnitude longer than that of fully paraffinic HBC 4 (0.0011 ms). The maximum transient photoconductivities of liquid-crystalline 1a-1c are comparable to one another and also to those of HBCs without ester-ether terminals. Liquid-crystalline 1a exhibits an obvious photocurrent generation in response to light illumination.

引用

页码：876 / 880

页数：5

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