Electron injection into organic semiconductor devices from high work function cathodes

被引：128

作者：

Hoven, Corey V. ^{[1
]}

Yang, Renqiang ^{[1
]}

Garcia, Andres ^{[1
]}

Crockett, Victoria ^{[2
]}

Heeger, Alan J. ^{[1
]}

Bazan, Guillermo C. ^{[1
]}

Nguyen, Thuc-Quyen ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Dept Chem & Biochem, Dept Mat, Santa Barbara, CA 93106 USA

[2] Jackson State Univ, Dept Chem, Jackson, MS 39217 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2008年 / 105卷 / 35期

基金：

美国国家科学基金会;

关键词：

conjugated polyelectrolytes; ion motion; polymer light-emitting diodes; electron transporting layer; charge injection;

D O I：

10.1073/pnas.0806494105

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We show that polymer light-emitting diodes with high work-function cathodes and conjugated polyelectrolyte injection/transport layers exhibit excellent efficiencies despite large electron-injection barriers. Correlation of device response times with structure provides evidence that the electron-injection mechanism involves redistribution of the ions within the polyelectrolyte electron-transport layer and hole accumulation at the interface between the emissive and electron-transport layers. Both processes lead to screening of the internal electric field and a lowering of the electron-injection barrier. The hole and electron currents are therefore diffusion currents rather than drift currents. The response time and the device performance are influenced by the type of counterion used.

引用

页码：12730 / 12735

页数：6

共 55 条

[1] Transient electroluminescence in multilayer organic light-emitting diodes:: experiment and theory [J].

Book, K ;

Nikitenko, VR ;

Bässler, H ;

Elschner, A .

SYNTHETIC METALS, 2001, 122 (01) :135-139

[2] Role of electron injection in polyfluorene-based light emitting diodes containing PEDOT:PSS -: art. no. 205209 [J].

Brewer, PJ ;

Lane, PA ;

Huang, JS ;

DeMello, AJ ;

Bradley, DDC ;

DeMello, JC .

PHYSICAL REVIEW B, 2005, 71 (20)

[3] Internal field screening in polymer light-emitting diodes [J].

Brewer, PJ ;

Lane, PA ;

deMello, AJ ;

Bradley, DDC ;

deMello, JC .

ADVANCED FUNCTIONAL MATERIALS, 2004, 14 (06) :562-570

[4] POLY(P-PHENYLENEVINYLENE) LIGHT-EMITTING-DIODES - ENHANCED ELECTROLUMINESCENT EFFICIENCY THROUGH CHARGE CARRIER CONFINEMENT [J].

BROWN, AR ;

BRADLEY, DDC ;

BURROUGHES, JH ;

FRIEND, RH ;

GREENHAM, NC ;

BURN, PL ;

HOLMES, AB ;

KRAFT, A .

APPLIED PHYSICS LETTERS, 1992, 61 (23) :2793-2795

[5] Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layer [J].

Brown, TM ;

Kim, JS ;

Friend, RH ;

Cacialli, F ;

Daik, R ;

Feast, WJ .

APPLIED PHYSICS LETTERS, 1999, 75 (12) :1679-1681

[6] 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

[7] The Schottky energy barrier dependence of charge injection in organic light-emitting diodes [J].

Campbell, IH ;

Davids, PS ;

Smith, DL ;

Barashkov, NN ;

Ferraris, JP .

APPLIED PHYSICS LETTERS, 1998, 72 (15) :1863-1865

[8] DIRECT MEASUREMENT OF THE INTERNAL ELECTRIC-FIELD DISTRIBUTION IN A MULTILAYER ORGANIC LIGHT-EMITTING DIODE [J].

CAMPBELL, IH ;

JOSWICK, MD ;

PARKER, ID .

APPLIED PHYSICS LETTERS, 1995, 67 (21) :3171-3173

[9] Ionic space-charge effects in polymer light-emitting diodes [J].

deMello, JC ;

Tessler, N ;

Graham, SC ;

Friend, RH .

PHYSICAL REVIEW B, 1998, 57 (20) :12951-12963

[10] Imaging the structure of the p-n junction in polymer light-emitting electrochemical cells [J].

Dick, DJ ;

Heeger, AJ ;

Yang, Y ;

Pei, QB .

ADVANCED MATERIALS, 1996, 8 (12) :985-987

← 1 2 3 4 5 6 →