Development of Fully-Printed and Eco-Friendly Light-Emitting Diodes Using Organometal Hybrid Perovskite Emitters

使用有机金属杂化钙钛矿发射体开发全印刷且环保的发光二极管

• 批准号: 1609032
• 负责人: Zhibin Yu
• 金额: $ 30万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1609032&HistoricalAwards=false
• 关键词: Development; Fully; Printed; Eco; Friendly

Abstract:Non-Technical:Light-emitting diodes have evolved as important commercial products. They are believed to replace traditional incandescent and fluorescent light bulbs for displays and lighting luminaires. While the brightness and stability of light-emitting diodes have greatly improved over the past decade, cost per diode still remains relatively high. This has become a bottleneck limiting their wide market penetration. This project aims to develop a revolutionary technology that can employ scalable printing processes to fabricate large area light-emitting diodes with high throughput. No existing light-emitting diodes can be printed due to the demand for a multilayer device architecture. In contrast, the proposed devices utilize an extremely simplified single-layer device structure. Such a distinctive approach opens up a novel path towards obtaining fully printed light-emitting diodes, in which every single fabrication step may be performed by printing. The project will focus on the material chemistry and process development that will eventually lead to the manufacturing of light-emitting diode displays and light panels on both rigid and flexible substrates. Such advancements will greatly reduce the cost of light-emitting diode products, while allowing for greater energy savings in multiple application fields especially where large area and diffused light are both desired such as: solid state lighting, information displays and illuminated wallpapers.Technical:The new generation light-emitting diodes are based on organometal hybrid perovskites, an emerging class of semiconducting materials that can be readily dissolved in an organic solvent and crystalized into luminescent thin films after solvent evaporation. The perovskites are mixed with a polymer to control the crystallization dynamics and morphology of the resulting light-emitting thin films. The first research task is to optimize the nucleation and growth of light-emitting perovskite crystals in polymer matrices, and obtain the optimal perovskite morphology for light-emitting applications. The optimal morphological structure will be determined by measuring the opto-electronic properties of the composite and determining the efficiency and brightness. This will allow the characterization of relationships between different structures and properties of the materials and design scientific models to describe the compositing process. Once the structure property relations between the perovskite materials and polymers have been fully determined the results will be used as a scientific basis to make LEDs of various colors; as well as improving the environmental stability of those devices. The final step of the project will be investigating the rheological behaviors of the perovskite polymer solutions and optimize the processing techniques to produce uniform, large area light-emitting thin films. The process resolution will simultaneously be investigated to allow pixel size features to be created. This work would allow for establishing a novel type of light-emitting technology on the market. In addition the work will enhance the fundamental understanding of the structure-process-property relationship of perovskite emitters. Such knowledge is crucial for the rational design and optimization of perovskite light-emitting diodes for achieving large area and low cost displays and light panels.

摘要：非技术：发光二极管已发展成为重要的商业产品。人们相信它们将取代用于显示器和照明灯具的传统白炽灯泡和荧光灯泡。虽然发光二极管的亮度和稳定性在过去十年中已经大大提高，但每个二极管的成本仍然相对较高。这已成为限制其广泛市场渗透的瓶颈。该项目旨在开发一种革命性的技术，可以采用可扩展的印刷工艺来制造高产量的大面积发光二极管。由于对多层器件架构的需求，现有的发光二极管无法被印刷。相比之下，所提出的器件采用极其简化的单层器件结构。这种独特的方法开辟了一条获得完全印刷的发光二极管的新途径，其中每个制造步骤都可以通过印刷来执行。该项目将重点关注材料化学和工艺开发，最终将在刚性和柔性基板上制造发光二极管显示器和光板。这些进步将大大降低发光二极管产品的成本，同时在多个应用领域实现更大的节能效果，特别是在需要大面积和漫射光的情况下，例如：固态照明、信息显示和发光壁纸。新一代发光二极管基于有机金属杂化钙钛矿，这是一种新兴的半导体材料，可以很容易地溶解在有机溶剂中，并在溶剂蒸发后结晶成发光薄膜。将钙钛矿与聚合物混合以控制所得发光薄膜的结晶动力学和形态。第一个研究任务是优化聚合物基体中发光钙钛矿晶体的成核和生长，并获得适合发光应用的最佳钙钛矿形貌。通过测量复合材料的光电特性并确定效率和亮度来确定最佳形态结构。这将允许表征材料的不同结构和性能之间的关系，并设计科学模型来描述复合过程。一旦钙钛矿材料与聚合物之间的结构性能关系得到充分确定，其结果将作为制造各种颜色LED的科学依据；以及提高这些设备的环境稳定性。该项目的最后一步将研究钙钛矿聚合物溶液的流变行为，并优化加工技术以生产均匀的大面积发光薄膜。将同时研究处理分辨率以允许创建像素尺寸特征。这项工作将有助于在市场上建立一种新型的发光技术。此外，这项工作将增强对钙钛矿发射体的结构-过程-性能关系的基本理解。这些知识对于钙钛矿发光二极管的合理设计和优化以实现大面积和低成本的显示器和光板至关重要。