Light-emitting Electrochemical Cell


Light-emitting Electrochemical Cell

A light-emitting electrochemical cell (LEC or LEEC) is a solid-state devices that generates light from an electric current (electroluminesces). They are usually composed of two metal electrodes connected by (e.g. sandwiching) an organic semiconducting material that contains mobile ions. Aside from the ions, their structure is very similar to that of an Organic light-emitting diode (OLED).

LECs have most of the advantages of OLEDs and several more:
* The device does not depend on the difference in work function of the electrodes, which means that the electrodes can be made of the same material (e.g. Gold), and the device can still be operated at low voltages. [Citation
last1 = Gao | first1 = J.
last2 = Dane | first2 = J.
contribution = Planar polymer light-emitting electrochemical cells with extremely large interelectrode spacing
title = Applied Physics Letters
year = 2003
doi = 10.1063/1.1618948
] [Citation
last1 = Shin | first1 = J.-H.
last2 = Dzwilewski | first2 = A.
last3 = Iwasiewicz | first3 = A.
last4 = Xial | first4 = S.
last5 = Fransson | first5 = A.
last6 = Ankah | first6 = G.N.
last7 = Edman | first7 = L.
contribution = Light emission at 5 V from a polymer device with a millimeter-sized interelectrode gap
title = Applied Physics Letters
year = 2006
doi = 10.1063/1.2219122
]
* The thickness of the active electroluminescent layer is not critical for the device to operate. This means that:
**LECs can be printed [Citation
last1 = Mauthner | first1 = G.
last2 = Landfester | first2 = K.
last3 = Kock | first3 = A.
last4 = Bruckl | first4 = H.
last5 = Kast | first5 = M.
last6 = Stepper | first6 = C.
last7 = List | first7 = E.J.W.
contribution = Inkjet printed surface cell light-emitting devices from a water-based polymer dispersion
title = Organic Electronics
year = 2008
doi = 10.1016/j.orgel.2007.10.007
] with relatively inexpensive printing processes (where control over film thicknesses can be difficult).
**Internal device operation can be observed directly. [Citation
last1 = Gao | first1 = J.
last2 = Dane | first2 = J.
contribution = Visualization of electrochemical doping and light-emitting junction formation in conjugated polymer films
title = Applied Physics Letters
year = 2004
doi = 10.1063/1.1702126
]

History

The invention of the polymer LEC is attributed to Pei et al. [Citation
last1 = Pei | first1 = Q.B.
last2 = Yu | first2 = G.
last3 = Zhang | first3 = C.
last4 = Yang | first4 = Y.
last5 = Heeger | first5 = A.J.
contribution = Polymer Light-Emitting Electrochemical-Cells
year = 1995
title = Science
doi = 10.1126/science.269.5227.1086
] Since then, numerous research groups, and even a few companies, have worked on improving and commercializing the devices.

References


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …   Wikipedia

  • Organic light-emitting diode — Demonstration of a flexible OLED device A green emitting OLED device An …   Wikipedia

  • Organic light-emitting transistor — An organic light emitting transistor (OLET) is a form of transistor that emits light. These transistors have been claimed to have potential for digital displays and on chip optical interconnects.[1] OLET is a new light emission concept, providing …   Wikipedia

  • Flexible organic light-emitting diode — Demonstration of a flexible OLED device Demonstration of a battery driven flexible OLED lamp fr …   Wikipedia

  • electrochemical reaction — ▪ chemistry Introduction       any process either caused or accompanied by the passage of an electric current and involving in most cases the transfer of electrons between two substances one a solid and the other a liquid.       Under ordinary… …   Universalium

  • Digital Light Processing — The DLP Logo Further information: History of display technology Digital Light Processing (DLP) is a trademark owned by Texas Instruments, representing a technology used in some TVs and video projectors. It was originally developed in 1987 by Dr.… …   Wikipedia

  • Quantum dot display — A quantum dot display is a type of display technology used in flat panel displays as an electronic visual display. Quantum dots (QD) or semiconductor nanocrystals are a form of light emitting technology and consist of nano scale crystals that can …   Wikipedia

  • Field emission display — A field emission display (FED) is a display technology that incorporates flat panel display technology that uses large area field electron emission sources to provide electrons that strike colored phosphor to produce a color image as a electronic …   Wikipedia

  • Computer-generated holography — (CGH) is the method of digitally generating holographic interference patterns. A holographic image can be generated e.g. by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by… …   Wikipedia

  • Next generation of display technology — is a term used to describe any display technology that could outperform LCD and Plasma technologies in the future. List of next generation display technologies Display technology Companies involved Status Organic light emitting diode (OLED) Sony …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.