Stable and efficient blue light-emitting diodes

显示技术已经在从手表到厨房电器的各种设备中变得普遍。溶液处理发光二极管(LED)有望降低成本，提高显示技术的色彩纯度和清晰度。然而，蓝色溶液处理的LED在操作稳定性、颜色纯度和效率方面落后于同类产品。LED在显示技术中的普及为提高功率转换效率(降低能耗)、提高颜色纯度和清晰度、降低材料成本和提高长期运行稳定性提供了必要的研究。 钙钛矿是一类新型材料，已在高效发光和光伏领域得到应用。这些材料在功率转换效率和绿色和红色发射线宽(影响显示器颜色纯度)方面取得了显著进步。然而，蓝色钙钛矿型LED在效率和操作稳定性方面落后。在这个项目中，我们将确定能够实现高性能、稳定、窄线宽、低成本蓝光发射的参数的材料。我们将使用计算化学方法来为这些材料的合成提供信息。我们将对这些材料的发射颜色、线宽和效率以及稳定性进行表征。然后，我们将设计利用这些材料的蓝色发射能力的LED。拟议的研究和开发最终将展示高效、窄线宽和稳定的蓝色LED。 该项目是UFTT与电信和移动设备公司华为加拿大公司的合作伙伴关系。UofT实习生将与他们在华为加拿大的同事密切合作，在获得商业环境下的高级研发经验的同时，实现该项目的目标。

Display technologies have become prevalent in devices from watches to kitchen appliances. Solution-processed light-emitting diodes (LEDs) promise to reduce costs and increase the colour purity and sharpness of display technologies. However, the blue solution-processed LED has lagged behind its counterparts in operational stability, color purity, and efficiency. The pervasiveness of LEDs in display technologies warrants investigations to improve power conversion efficiency (to decrease energy consumption), increase color purity and sharpness, reduce material costs, and increase long-term operational stability. Perovskites are a new class of materials that have found applications in efficient light emission and photovoltaics. These materials have enabled striking advances in power conversion efficiency and narrow emission linewidths (affecting display color purity) in the green and red. Blue perovskite LEDs, however are behind in efficiency and operational stability. In this project, we will identify materials with parameters that enable high performance, stable, narrow linewidth, low-cost blue emission. We will use computational chemistry methods to inform the synthesis of these materials. We will characterize these materials for emission color, linewidth and efficiency, and stability. We will then design LEDs that harness these materials' blue-emitting capability. The proposed research and development will culminate in the demonstration of efficient, narrow-linewidth, and stable blue LEDs. This project is a partnership between UofT and Huawei Canada, a telecommunications and mobile devices company. UofT trainees will work closely with their colleagues at Huawei Canada to realize the goals of the project while gaining experience in advanced R&D in a commercial setting.