Barrier-free electron-hole capture in polymer blend heterojunction light-emitting diodes

被引：280

作者：

Morteani, AC

Dhoot, AS

Kim, JS

Silva, C

Greenham, NC

Murphy, C

Moons, E

Ciná, S

Burroughes, JH

Friend, RH

机构：

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

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

来源：

ADVANCED MATERIALS | 2003年 / 15卷 / 20期

关键词：

D O I：

10.1002/adma.200305618

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A novel barrier-free mechanism for electron-hole capture at heterojunctions between two semiconductor polymers is shown to occur in highly efficient light-emitting diodes (LEDs). Electron-hole capture across the heterojunction forms an exciplex-a localized heterojunction state-and subsequent endothermic energy transfer produces highly emissive excitons. This process only requires low charge densities at the interface, enabling excellent LED performance.

引用

页码：1708 / +

页数：6

共 32 条

[1] Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials
Adachi, C
Kwong, RC
Djurovich, P
Adamovich, V
Baldo, MA
Thompson, ME
Forrest, SR
[J]. APPLIED PHYSICS LETTERS, 2001, 79 (13) : 2082 - 2084
[2] Nanolayered heterojunctions of donor and acceptor conjugated polymers of interest in light emitting and photovoltaic devices: Photoinduced electron transfer at polythiophene/polyquinoline interfaces
Alam, MM
Jenekhe, SA
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (13): : 2479 - 2482
[3] [Anonymous], 1975, SINGLET AND TRIPLET
[4] Photovoltaic performance and morphology of polyfluorene blends: A combined microscopic and photovoltaic investigation
Arias, AC
MacKenzie, JD
Stevenson, R
Halls, JJM
Inbasekaran, M
Woo, EP
Richards, D
Friend, RH
[J]. MACROMOLECULES, 2001, 34 (17) : 6005 - 6013
[5] Charge carrier transport and recombination at the interface between disordered organic dielectrics
Arkhipov, VI
Emelianova, EV
Bässler, H
[J]. JOURNAL OF APPLIED PHYSICS, 2001, 90 (05) : 2352 - 2357
[6] Light-emitting electrochemical processes
Armstrong, NR
Wightman, RM
Gross, EM
[J]. ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 2001, 52 : 391 - 422
[7] Degradation mechanism of small molecule-based organic light-emitting devices
Aziz, H
Popovic, ZD
Hu, NX
Hor, AM
Xu, G
[J]. SCIENCE, 1999, 283 (5409) : 1900 - 1902
[8] WHITE-LIGHT FROM AN ELECTROLUMINESCENT DIODE MADE FROM POLY[3(4-OCTYLPHENYL)-2,2'-BITHIOPHENE] AND AN OXADIAZOLE DERIVATIVE
BERGGREN, M
GUSTAFSSON, G
INGANAS, O
ANDERSSON, MR
HJERTBERG, T
WENNERSTROM, O
[J]. JOURNAL OF APPLIED PHYSICS, 1994, 76 (11) : 7530 - 7534
[9] LIGHT-EMITTING-DIODES WITH VARIABLE COLORS FROM POLYMER BLENDS
BERGGREN, M
INGANAS, O
GUSTAFSSON, G
RASMUSSON, J
ANDERSSON, MR
HJERTBERG, T
WENNERSTROM, O
[J]. NATURE, 1994, 372 (6505) : 444 - 446
[10] Device model investigation of bilayer organic light emitting diodes
Crone, BK
Davids, PS
Campbell, IH
Smith, DL
[J]. JOURNAL OF APPLIED PHYSICS, 2000, 87 (04) : 1974 - 1982

← 1 2 3 4 →