Barriers to electron extraction in polymer light-emitting diodes

被引：82

作者：

Murata, K

Cinà, S

Greenham, NC

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Cambridge Display Technol, Cambridge CB3 0HJ, England

来源：

APPLIED PHYSICS LETTERS | 2001年 / 79卷 / 08期

关键词：

D O I：

10.1063/1.1396627

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the performance of single-layer polymer light-emitting diodes based on a polyfluorene derivative. Hole-only devices show low currents; however, double-carrier devices show high currents and high efficiencies, implying that the presence of electrons in the device enhances hole injection. By numerical modeling, we show that this behavior is consistent with the presence of a barrier to electron extraction at the anode which causes an increased field for hole injection due to the buildup of electrons at the barrier. (C) 2001 American Institute of Physics.

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页码：1193 / 1195

页数：3

相关论文

共 14 条

[1] Temperature dependent electron-hole recombination in polymer light-emitting diodes [J].

Blom, PWM ;

deJong, MJM ;

Breedijk, S .

APPLIED PHYSICS LETTERS, 1997, 71 (07) :930-932

[2] Device physics of single layer organic light-emitting diodes [J].

Crone, BK ;

Campbell, IH ;

Davids, PS ;

Smith, DL ;

Neef, CJ ;

Ferraris, JP .

JOURNAL OF APPLIED PHYSICS, 1999, 86 (10) :5767-5774

[3] Enhanced brightness and efficiency in organic electroluminescent devices using SiO2 buffer layers [J].

Deng, ZB ;

Ding, XM ;

Lee, ST ;

Gambling, WA .

APPLIED PHYSICS LETTERS, 1999, 74 (15) :2227-2229

[4] Modification of the hole injection barrier in organic light-emitting devices studied by ultraviolet photoelectron spectroscopy [J].

Ding, XM ;

Hung, LM ;

Cheng, LF ;

Deng, ZB ;

Hou, XY ;

Lee, CS ;

Lee, ST .

APPLIED PHYSICS LETTERS, 2000, 76 (19) :2704-2706

[5] Electroluminescence in conjugated polymers [J].

Friend, RH ;

Gymer, RW ;

Holmes, AB ;

Burroughes, JH ;

Marks, RN ;

Taliani, C ;

Bradley, DDC ;

Dos Santos, DA ;

Brédas, JL ;

Lögdlund, M ;

Salaneck, WR .

NATURE, 1999, 397 (6715) :121-128

[6] Characterization of the PEDOT-PSS system by means of X-ray and ultraviolet photoelectron spectroscopy [J].

Greczynski, G ;

Kugler, T ;

Salaneck, WR .

THIN SOLID FILMS, 1999, 354 (1-2) :129-135

[7] High performance organic polymer light-emitting heterostructure devices [J].

He, Y ;

Gong, S ;

Hattori, R ;

Kanicki, J .

APPLIED PHYSICS LETTERS, 1999, 74 (16) :2265-2267

[8]

Ho PKH, 1998, ADV MATER, V10, P769, DOI 10.1002/(SICI)1521-4095(199807)10:10<769::AID-ADMA769>3.0.CO

[9]

2-3

[10] Molecular-scale interface engineering for polymer light-emitting diodes [J].

Ho, PKH ;

Kim, JS ;

Burroughes, JH ;

Becker, H ;

Li, SFY ;

Brown, TM ;

Cacialli, F ;

Friend, RH .

NATURE, 2000, 404 (6777) :481-484