A simple device structure (PEDOT-PSS//(PPV + electrolyte)//graphene) emitted yellow light.

Important note is graphene was used as cathode and graphene can be printed.

Although sheen resistance of grpahene was very high (5 k ohm per sq vs. 20 ohm per sq for ITO).

Published in ACSNano. http://pubs.acs.org/doi/pdfplus/10.1021/nn9018569

Views: 233

Tags: LED, devices, emitting, graohene, light, processed, solution

Comment

You need to be a member of The International NanoScience Community to add comments!

Join The International NanoScience Community


Full member
Comment by Debasis on March 10, 2010 at 10:08pm
A solution processed top emission OLED with transparent carbon nanotube electrodes
Work by: Chien et al. (Nanotechnology 21 (2010) 134020 (5pp))
http://iopscience.iop.org/0957-4484/21/13/134020/pdf/0957-4484_21_1...

As an alternative to ITO, CNT/Al is used as anode. The sheet resistance of CNT layer was: 100 Ohm/sq with transmission ~60%. it goes up to 500 Ohm/sq for ~90% transmission. Device structure was: Al/Lif/organic layer/PEDOT-PSS/CNT (Al)

I had an impression that top emission means emission from cathode side. Anyway, I was trying to understand why was the effort on emission from CNT side. Is it due to increase extraction efficiency? Authors didnt mention anything about it. Differnece of refractive indices (ITO ~2.0, glass ~1.52, air 1.0, organic layer ~ 1.7) between organic and ITO is significant. I dont know refractive index of CNT. But I found this article: Nanotechnology 18 (2007) 265706 (5pp), (http://iopscience.iop.org/0957-4484/18/26/265706/pdf?ejredirect=.io...). I assume that refractive index of CNT ~1.1. (not sure, anybody knows about this?). If so, there is less refractive index difference between air and CNT. may be it should help to increase the external efficiency. CNT can also scatter the light. that would also further enhance, I assume.

Any comments from anybody??

Next partner events of TINC

We are Media Partner of:

Welcome - about us

Welcome! Nanopaprika was cooked up by Hungarian chemistry PhD student in 2007. The main idea was to create something more personal than the other nano networks already on the Internet. Community is open to everyone from post-doctorial researchers and professors to students everywhere.

There is only one important assumption: you have to be interested in nano!

Nanopaprika is always looking for new partners, if you have any idea, contact me at editor@nanopaprika.eu

Dr. András Paszternák, founder of Nanopaprika

Publications by A. Paszternák:

The potential use of cellophane test strips for the quick determination of food colours

pH and CO2 Sensing by Curcumin-Coloured Cellophane Test Strip

Polymeric Honeycombs Decorated by Nickel Nanoparticles

Directed Deposition of Nickel Nanoparticles Using Self-Assembled Organic Template,

Organometallic deposition of ultrasmooth nanoscale Ni film,

Zigzag-shaped nickel nanowires via organometallic template-free route

Surface analytical characterization of passive iron surface modified by alkyl-phosphonic acid layers

Atomic Force Microscopy Studies of Alkyl-Phosphonate SAMs on Mica

Amorphous iron formation due to low energy heavy ion implantation in evaporated 57Fe thin films

Surface modification of passive iron by alkylphosphonic acid layers

Formation and structure of alkylphosphonic acid layers on passive iron

Structure of the nonionic surfactant triethoxy monooctylether C8E3 adsorbed at the free water surface, as seen from surface tension measurements and Monte Carlo simulations

Warning: require_once(xn-app://widgetlaboratory/apps/windex.php): failed to open stream: "XN_AppFilesystemStream::stream_open" call failed in /apps/nanoscience/index.php on line 5 Fatal error: require_once(): Failed opening required 'xn-app://widgetlaboratory/apps/windex.php' (include_path='.:/php/includes/XN:/php/includes/PEAR:/php/includes/other') in /apps/nanoscience/index.php on line 5