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News Release from: Cambridge Display Technology
Edited by the Electronicstalk Editorial
Team on 22 March 2002
Dendrimers provide alternative OLED
structure
High efficiency organic light emitting diodes (OLEDs) using pioneering dendrimer materials have been developed by scientists sponsored by display technology developer Opsys.
High efficiency organic light emitting diodes (OLEDs) using pioneering dendrimer materials have been developed by scientists sponsored by display technology developer Opsys The results have broad implications for the commercialisation of OLED technology in the flat panel display industry
This article was originally published on Electronicstalk on 15 Nov 2001 at 8.00am (UK)
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The Opsys sponsored teams, led by Dr Paul Burn at the University of Oxford and by Professor Ifor Samuel at the University of St Andrews, have shown that dendrimers can be used to produce efficient solution processed OLED devices with just a single layer of organic material between the electrodes.
In contrast, existing phosphorescent materials require multiple layers of deposition by more expensive evaporation techniques.
Dr Paul Burn of the University of Oxford, and a consultant to Opsys, Explains: "Unlike light emitting polymers (LEPs), dendrimers can incorporate the best features of small molecule materials, such as highly efficient phosphorescent emitting cores, whilst also being solution processable.
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As such dendrimers are a promising alternative to both small molecule and LEP approaches to OLEDs".
The only OLED materials other than dendrimers that can be deposited by solution processing methods are light emitting polymers (LEPs).
However, LEPs are not as versatile, as the same chemical components of an LEP are responsible for both its light emitting features and its processing features.
In dendrimers, the surface groups may be tuned independently of the emitting core, providing flexibility in the processing properties.
Opsys CEO Michael Holmes adds: "Highly efficient single organic layer dendrimer devices could greatly reduce manufacturing costs.
Currently, the most efficient OLEDs require three or more layers, which must be deposited sequentially by thermal evaporation.
Dendrimer materials are set to change this as fabrication of OLEDs via solution processable materials is simple and opens up exciting possibilities such as inkjet printing of displays.
Dendrimers have the potential to make long-term improvements in colour quality, power efficiency, lifetime and processing costs.
These are necessary in order for OLEDs to meet expectations for their growth within the displays sector and to fulfil their transformational potential in general lighting, d?cor and signage applications".
"Opsys is the exclusive licensee of patent applications covering this work.
These additional patent applications will consolidate our position as the key intellectual property holder of light emitting dendrimer technology for OLEDs", concludes Holmes.
The results will be announced by Professor Ifor Samuel at the American Physical Society conference on 22nd March 2002.
They will also be published in Applied Physics Letters on 15th April 2002, under the title "High efficiency green phosphorescence from spin-coated single layer dendrimer LED structures".
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