Use of cross-linkable polyfluorene in the fabrication of multilayer polyfluorene-based light-emitting diodes with improved efficiency

被引：22

作者：

Charas, A.

Alves, H.

Alcacer, L.

Morgado, J.

机构：

[1] Univ Tecn Lisboa, Inst Telecomunicacoes, Inst Super Tecn, P-1049001 Lisbon, Portugal

[2] Univ Tecn Lisboa, Dept Engn Quim & Biol, Inst Super Tecn, P-1049001 Lisbon, Portugal

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 14期

关键词：

D O I：

10.1063/1.2360243

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors report the use of a cross-linkable polyfluorene to fabricate multilayer light-emitting diodes (LEDs), thereby avoiding the restriction to combine polymeric solutions in different solvents. In particular, we find that for LEDs fabricated with a hole-injection layer of poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonic acid (PEDOT), with magnesium cathodes and with poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), as emissive layer, its electroluminescence efficiency increases from 2 to 5.5 cd/A upon insertion of the cross-linked polyfluorene between PEDOT and F8BT. This efficiency increase is attributed to an improvement of charge carrier balance within the F8BT emissive layer and a reduction of exciton quenching at PEDOT interface. (c) 2006 American Institute of Physics.

引用

收藏

页数：3

相关论文

共 28 条

[1] The contact difference of potential between barium and magnesium [J].

Anderson, PA .

PHYSICAL REVIEW, 1938, 54 (09) :753-757

[2] Photo-cross-linked triphenylenes as novel insoluble hole transport materials in organic LEDs [J].

Bacher, A ;

Erdelen, CH ;

Paulus, W ;

Ringsdorf, H ;

Schmidt, HW ;

Schuhmacher, P .

MACROMOLECULES, 1999, 32 (14) :4551-4557

[3] 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

[4] 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

[5] Efficient green light-emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene) [J].

Cacialli, F ;

Friend, RH ;

Haylett, N ;

Daik, R ;

Feast, WJ ;

dosSantos, DA ;

Bredas, JL .

APPLIED PHYSICS LETTERS, 1996, 69 (25) :3794-3796

[6] Dispersive electron transport in an electroluminescent polyfluorene copolymer measured by the current integration time-of-flight method [J].

Campbell, AJ ;

Bradley, DDC ;

Antoniadis, H .

APPLIED PHYSICS LETTERS, 2001, 79 (14) :2133-2135

[7] Excitation energy transfer and spatial exciton confinement in polyfluorene blends for application in light-emitting diodes [J].

Charas, A ;

Morgado, J ;

Martinho, JMG ;

Fedorov, A ;

Alcácer, L ;

Cacialli, F .

JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (12) :3523-3527

[8] Synthesis and luminescence properties of a new polyfluorene copolymer with regulated solubility [J].

Charas, A ;

Morgado, J ;

Alcácer, L ;

Brogueira, P ;

Cacialli, F .

SYNTHETIC METALS, 2004, 147 (1-3) :275-279

[9] Synthesis and luminescence properties of three novel polyfluorene copolymers [J].

Charas, A ;

Morgado, J ;

Martinho, JMG ;

Alcácer, L ;

Lim, SF ;

Friend, RH ;

Cacialli, F .

POLYMER, 2003, 44 (06) :1843-1850

[10]

CHARAS A, UNPUB