As the Internet of Things and the emergence of smart materials proliferate, the demand for inexpensive, long-lasting, and efficient electroluminescent devices will continue to increase. Perovskites are solution-processible and Earth-abundant crystalline materials exhibiting high efficiency, attracting significant industrial attention. We have recently demonstrated simple light-emitting devices constructed from a single perovskite layer termed light-emitting electrochemical cells, which utilize battery-like charging to achieve high brightness and efficiency. Taking advantage of their simple architecture and facile construction, we will leverage robotic fabrication to rapidly produce arrays of varied perovskite thin film devices for optimized performance. To begin, we will precisely tune the lithium-ion charging of these devices for enhanced efficiency and stability. Next, we will robotically fabricate films and devices with a continuous range of colors, green through red, by tuning the chemical composition of the perovskite crystals. Finally, we will utilize robotic fabrication to tailor the crystal structures of these films, resulting in crystalline sheets that exhibit high-efficiency blue emission. This work will train undergraduate and graduate researchers for competitive careers in semiconductor technologies. The project will develop new technologies suitable for commercialization and provide insight into existing approaches. The program will create a new instrument for h