Relaxation Dynamics of Photoexcited Excitons in Rubrene Single Crystals Using Femtosecond Absorption Spectroscopy

被引：27

作者：

Tao, S. ^{[1
]}

Ohtani, N. ^{[1
]}

Uchida, R. ^{[1
]}

Miyamoto, T. ^{[1
]}

Matsui, Y. ^{[1
]}

Yada, H. ^{[1
]}

Uemura, H. ^{[1
]}

Matsuzaki, H. ^{[1
]}

Uemura, T. ^{[2
]}

Takeya, J. ^{[2
]}

Okamoto, H. ^{[1
]}

机构：

[1] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

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

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 09期

关键词：

TETRACENE; TRANSPORT;

D O I：

10.1103/PhysRevLett.109.097403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The relaxation dynamics of an exciton in rubrene was investigated by femtosecond absorption spectroscopy. Exciton relaxation to a self-trapped state occurs via the coherent oscillation with 78 cm(-1) due to a coupled mode of molecular deformations with phenyl-side-group motions and molecular displacements. From the temperature dependence of the decay time of excitons, the energy necessary for an exciton to escape from a self-trapped state is evaluated to be similar to 35 meV (similar to 400 K). As a result, a self-trapped exciton is stable at low temperatures. At room temperature, excitons can escape from a self-trapped state and, subsequently, they are dissociated to charged species. The exciton dissociation mechanism is discussed on the basis of the results.

引用

页数：5

共 27 条

[1] Polarized superradiance from delocalized exciton transitions in tetracene single crystals [J].

Camposeo, A. ;

Polo, M. ;

Tavazzi, S. ;

Silvestri, L. ;

Spearman, P. ;

Cingolani, R. ;

Pisignano, D. .

PHYSICAL REVIEW B, 2010, 81 (03)

[2] Hall-Effect Measurements Probing the Degree of Charge-Carrier Delocalization in Solution-Processed Crystalline Molecular Semiconductors [J].

Chang, Jui-Fen ;

Sakanoue, Tomo ;

Olivier, Yoann ;

Uemura, Takafumi ;

Dufourg-Madec, Marie-Beatrice ;

Yeates, Stephen G. ;

Cornil, Jerome ;

Takeya, Jun ;

Troisi, Alessandro ;

Sirringhaus, Henning .

PHYSICAL REVIEW LETTERS, 2011, 107 (06)

[3] Transport properties in the rubrene crystal:: Electronic coupling and vibrational reorganization energy [J].

da Silva, DA ;

Kim, EG ;

Brédas, JL .

ADVANCED MATERIALS, 2005, 17 (08) :1072-+

[4] TIME-RESOLVED VIBRATIONAL SPECTROSCOPY IN THE IMPULSIVE LIMIT [J].

DHAR, L ;

ROGERS, JA ;

NELSON, KA .

CHEMICAL REVIEWS, 1994, 94 (01) :157-193

[5] LOW-LYING VALENCE BAND STATES AND INTRINSIC PHOTOCONDUCTIVITY IN CRYSTALLINE ANTHRACENE AND TETRACENE [J].

GEACINTOV, N ;

POPE, M .

JOURNAL OF CHEMICAL PHYSICS, 1969, 50 (02) :814-+

[6] Rubrene micro-crystals from solution routes: their crystallography, morphology and optical properties [J].

Huang, Liwei ;

Liao, Qing ;

Shi, Qiang ;

Fu, Hongbing ;

Ma, Jinshi ;

Yao, Jiannian .

JOURNAL OF MATERIALS CHEMISTRY, 2010, 20 (01) :159-166

[7] Direct Imaging of Anisotropic Exciton Diffusion and Triplet Diffusion Length in Rubrene Single Crystals [J].

Irkhin, Pavel ;

Biaggio, Ivan .

PHYSICAL REVIEW LETTERS, 2011, 107 (01)

[8] Oxygen-related band gap state in single crystal rubrene [J].

Mitrofanov, Oleg ;

Lang, David V. ;

Kloc, Christian ;

Wikberg, J. Magnus ;

Siegrist, Theo ;

So, Woo-Young ;

Sergent, M. A. ;

Ramirez, Arthur P. .

PHYSICAL REVIEW LETTERS, 2006, 97 (16)

[9] Primary photoexcitations and the origin of the photocurrent in rubrene single crystals [J].

Najafov, H ;

Biaggio, I ;

Podzorov, V ;

Calhoun, MF ;

Gershenson, ME .

PHYSICAL REVIEW LETTERS, 2006, 96 (05)

[10] Observation of long-range exciton diffusion in highly ordered organic semiconductors [J].

Najafov, H. ;

Lee, B. ;

Zhou, Q. ;

Feldman, L. C. ;

Podzorov, V. .

NATURE MATERIALS, 2010, 9 (11) :938-943

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