Highly efficient photoinduced phase transition in an organic radical crystal via two-photon absorption process

被引：10

作者：

Kon, Toyoki ^{[1
]}

Oguri, Seiji ^{[1
]}

Katayama, Ikufumi ^{[2
]}

Kodaira, Tetsuya ^{[3
]}

Takeda, Jun ^{[1
]}

机构：

[1] Yokohama Natl Univ, Grad Sch Engn, Dept Phys, Hodagaya Ku, Yokohama, Kanagawa 2408501, Japan

[2] Yokohama Natl Univ, Interdisciplinary Res Ctr, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

[3] Natl Inst Adv Ind Sci & Technol, Nanoarchitecton Res Ctr, Tsukuba 3058565, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 03期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

diamagnetism; excited states; magnetic transitions; organic compounds; paramagnetism; photoexcitation; two-photon processes; 1,3,5-TRITHIA-2,4,6-TRIAZAPENTALENYL; TEMPERATURE;

D O I：

10.1103/PhysRevB.79.035106

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied excitation energy dependence of the conversion yield of two-photon-mediated phase transition in organic radical 1,3,5-trithia-2,4,6-triazapentalenyl (TTTA) crystal. Even under photoexcitation far below the lowest charge-transfer absorption edge, the photoinduced phase transition takes place from diamagnetic low-temperature phase to paramagnetic high-temperature phase with threshold excitation density. By comparing the excitation energy dependence of the conversion yield with the two-photon absorption spectrum, we found that the conversion is resonantly enhanced by two-photon absorption process. Because of the strong three-dimensional interaction between the excited states of TTTA molecules, the homogeneous two-photon excitation can induce the phase transition with high efficiency.

引用

页数：4

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