In situ study on the reorientation of polymer chains in operating polymer diodes

被引：20

作者：

Guo, TF ^{[1
]}

Yang, Y ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 01期

关键词：

D O I：

10.1063/1.1430503

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A reflection-absorption Fourier-transform infrared spectroscopy experiment has been designed to in situ monitor poly(2-methoxy-5-(2(')-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV)-based polymer light-emitting diodes under stress test. This method enables the in situ study of the co-relation between device performance and the conformational transformation of a conjugated polymer. The experimental results indicate that the plane of the conjugated pi -electron cloud in MEH-PPV tends to align parallel to the substrate. This rearrangement enhances the pi-pi electron coupling and lowers the device operating voltage under high current densities. (C) 2002 American Institute of Physics.

引用

页码：148 / 150

页数：3

共 26 条

[1] VISIBLE-LIGHT EMISSION FROM SEMICONDUCTING POLYMER DIODES [J].

BRAUN, D ;

HEEGER, AJ .

APPLIED PHYSICS LETTERS, 1991, 58 (18) :1982-1984

[2] LIGHT-EMITTING-DIODES BASED ON CONJUGATED POLYMERS [J].

BURROUGHES, JH ;

BRADLEY, DDC ;

BROWN, AR ;

MARKS, RN ;

MACKAY, K ;

FRIEND, RH ;

BURN, PL ;

HOLMES, AB .

NATURE, 1990, 347 (6293) :539-541

[3] RELIABILITY AND DEGRADATION OF ORGANIC LIGHT-EMITTING DEVICES [J].

BURROWS, PE ;

BULOVIC, V ;

FORREST, SR ;

SAPOCHAK, LS ;

MCCARTY, DM ;

THOMPSON, ME .

APPLIED PHYSICS LETTERS, 1994, 65 (23) :2922-2924

[4]

Colthup N.B., 1990, INTRO INFRARED RAMAN

[5] The initial state of dark spots in degradation of polymer lighting-emitting diodes [J].

Do, LM ;

Hwang, DH ;

Chu, HY ;

Kim, SH ;

Lee, JI ;

Park, H ;

Zyung, T .

SYNTHETIC METALS, 2000, 111 :249-251

[6] Device degradation of polymer light emitting diodes studied by electroabsorption measurements [J].

Giebeler, C ;

Whitelegg, SA ;

Lidzey, DG ;

Lane, PA ;

Bradley, DDC .

APPLIED PHYSICS LETTERS, 1999, 75 (14) :2144-2146

[7] Stability and characterization of large area polymer light-emitting diodes over extended periods [J].

Gill, RE ;

van de Weijer, P ;

Liedenbaum, CTH ;

Schoo, HFM ;

Berntsen, A ;

Vleggaar, JJM ;

Visser, RJ .

OPTICAL MATERIALS, 1999, 12 (2-3) :183-187

[8] INFRARED STUDY OF ADSORBED MOLECULES ON METAL SURFACES BY REFLECTION TECHNIQUES [J].

GREENLER, RG .

JOURNAL OF CHEMICAL PHYSICS, 1966, 44 (01) :310-&

[9] Control of conformational and interpolymer effects in conjugated polymers [J].

Kim, J ;

Swager, TM .

NATURE, 2001, 411 (6841) :1030-1034

[10] Improved operational stability of polyfluorene-based organic light-emitting diodes with plasma-treated indium-tin-oxide anodes [J].

Kim, JS ;

Friend, RH ;

Cacialli, F .

APPLIED PHYSICS LETTERS, 1999, 74 (21) :3084-3086

← 1 2 3 →