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Multilayer photopatterned dendrimer LEDs for colour displays

用于彩色显示器的多层光图案化树枝状聚合物 LED

基本信息

批准号：
EP/F032099/1
负责人：
Ifor Samuel
金额：
$ 52.79万
依托单位：
University of St Andrews
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF032099%2F1
关键词：
Multilayer photopatterned dendrimer LEDs colour

项目摘要

The purpose of this proposal is to develop new light-emitting materials for displays, based on recent progress in highly branched molecules called conjugated dendrimers. Conjugated dendrimers are an exciting class of materials that combine the advantages of molecular and polymeric materials and following the work proposed here could be used to make low cost colour displays. They have well defined structures akin to molecular materials, but with the key advantage of having the solution processibility normally associated with polymers. Dendrimers consist of a core, dendrons, and surface groups and the choice of each of these components gives enormous control for optimising the material's opto-electronic properties. We have discovered that when small phosphorescent iridium complexes are encapsulated into a large branched molecule (dendrimer) high efficiencies can be obtained in much simpler device structures than those used for small phosphorescent molecules. We have demonstrated red green and blue dendrimer light-emitting diodes. However, all these devices have been monochrome and the soluble nature of the layers has meant that we have only been able to use two layer devices. We now wish to overcome these limitations by developing methods for photopatterning dendrimers to form a full colour pixellated display. The dendrimers will be patterned in the solid state by incorporating surface groups capable of being cross-linked. This will allow precise patterning of colour displays. In addition these cross-linked materials will enable multilayer devices to be made from solution, giving improvements in efficiency, and providing new ways of studying device physics.

这项提议的目的是开发用于显示器的新的发光材料，基于被称为共轭树枝状大分子的高支化分子的最新进展。共轭树枝状大分子是一类令人兴奋的材料，它结合了分子材料和聚合物材料的优点，根据这里提出的工作，可以用来制造低成本的彩色显示器。它们具有类似于分子材料的定义良好的结构，但关键优势是具有通常与聚合物相关的溶液加工性。树枝状大分子由核心、树枝和表面基团组成，选择这些组件中的每一个都可以极大地控制优化材料的光电性能。我们已经发现，当小的磷光Ir络合物被包裹到一个大的支化分子(树枝状大分子)中时，可以获得比用于小磷光分子的器件结构简单得多的效率。我们已经展示了红色、绿色和蓝色树枝状大分子发光二极管。然而，所有这些器件都是单色的，层的溶解性质意味着我们只能使用两层器件。现在，我们希望通过开发光穿透树枝状大分子的方法来克服这些限制，以形成全色像素化显示器。通过加入能够交联的表面基团，树枝状大分子将在固态中被图案化。这将允许彩色显示器的精确图案化。此外，这些交联材料将使多层器件能够从溶液中制造出来，从而提高效率，并为研究器件物理提供新的方法。