Stable and efficient blue light-emitting diodes

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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.