Infrared Organic Light-Emitting Diodes with Carbon Nanotube Emitters

被引：56

作者：

Graf, Arko ^{[1
,2
]}

Murawski, Caroline ^{[2
]}

Zakharko, Yuriy ^{[1
]}

Zaumseil, Jana ^{[1
]}

Gather, Malte C. ^{[2
]}

机构：

[1] Heidelberg Univ, Inst Phys Chem, D-69120 Heidelberg, Germany

[2] Univ St Andrews, Sch Phys & Astron, SUPA, Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland

来源：

ADVANCED MATERIALS | 2018年 / 30卷 / 12期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

emitter orientation; near infrared; organic light-emitting diodes; single-walled carbon nanotubes; trions; SELECTIVE DISPERSION; SP(3) DEFECTS; POLYMER; PHOTOLUMINESCENCE; EFFICIENCY; OLEDS; TRANSPARENT; ORIENTATION; COMPOSITE; TRANSPORT;

D O I：

10.1002/adma.201706711

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

While organic light-emitting diodes (OLEDs) covering all colors of the visible spectrum are widespread, suitable organic emitter materials in the near-infrared (nIR) beyond 800 nm are still lacking. Here, the first OLED based on single-walled carbon nanotubes (SWCNTs) as the emitter is demonstrated. By using a multilayer stacked architecture with matching charge blocking and charge-transport layers, narrow-band electroluminescence at wavelengths between 1000 and 1200 nm is achieved, with spectral features characteristic of excitonic and trionic emission of the employed (6,5) SWCNTs. Here, the OLED performance is investigated in detail and it is found that local conduction hot-spots lead to pronounced trion emission. Analysis of the emissive dipole orientation shows a strong horizontal alignment of the SWCNTs with an average inclination angle of 12.9 degrees with respect to the plane, leading to an exceptionally high outcoupling efficiency of 49%. The SWCNT-based OLEDs represent a highly attractive platform for emission across the entire nIR.

引用

页数：6

共 45 条

[1] Carbon nanotube sheets as electrodes in organic light-emitting diodes [J].

Aguirre, CM ;

Auvray, S ;

Pigeon, S ;

Izquierdo, R ;

Desjardins, P ;

Martel, R .

APPLIED PHYSICS LETTERS, 2006, 88 (18)

[2] Device efficiency of organic light-emitting diodes: Progress by improved light outcoupling [J].

Bruetting, Wolfgang ;

Frischeisen, Joerg ;

Schmidt, Tobias D. ;

Scholz, Bert J. ;

Mayr, Christian .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2013, 210 (01) :44-65

[3] Orientation of emissive dipoles in OLEDs: Quantitative in situ analysis [J].

Flaemmich, Michael ;

Gather, Malte C. ;

Danz, Norbert ;

Michaelis, Dirk ;

Braeuer, Andreas H. ;

Meerholz, Klaus ;

Tuennermann, Andreas .

ORGANIC ELECTRONICS, 2010, 11 (06) :1039-1046

[4] Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer [J].

Fournet, P ;

Coleman, JN ;

Lahr, B ;

Drury, A ;

Blau, WJ ;

O'Brien, DF ;

Hörhold, HH .

JOURNAL OF APPLIED PHYSICS, 2001, 90 (02) :969-975

[5] Lambertian white top-emitting organic light emitting device with carbon nanotube cathode [J].

Freitag, P. ;

Zakhidov, Al A. ;

Luessem, B. ;

Zakhidov, A. A. ;

Leo, K. .

JOURNAL OF APPLIED PHYSICS, 2012, 112 (11)

[6] Efficiency and rate of spontaneous emission in organic electroluminescent devices [J].

Furno, Mauro ;

Meerheim, Rico ;

Hofmann, Simone ;

Luessem, Bjoern ;

Leo, Karl .

PHYSICAL REVIEW B, 2012, 85 (11)

[7] White Organic Light-Emitting Diodes [J].

Gather, Malte C. ;

Koehnen, Anne ;

Meerholz, Klaus .

ADVANCED MATERIALS, 2011, 23 (02) :233-248

[8]

Gong XW, 2016, NAT PHOTONICS, V10, P253, DOI [10.1038/nphoton.2016.11, 10.1038/NPHOTON.2016.11]

[9] Correlating the transition dipole moment orientation of phosphorescent emitter molecules in OLEDs with basic material properties [J].

Graf, A. ;

Liehm, P. ;

Murawski, C. ;

Hofmann, S. ;

Leo, K. ;

Gather, M. C. .

JOURNAL OF MATERIALS CHEMISTRY C, 2014, 2 (48) :10298-10304

[10]

Graf A, 2017, NAT MATER, V16, P911, DOI [10.1038/NMAT4940, 10.1038/nmat4940]

← 1 2 3 4 5 →