Fabrication and characterization of electroluminescent devices based on metal chalcogenides and halide perovskites

Light-emitting devices have revolutionized our everyday style of living. Nowadays, we have the ability to use more bright and colorful displays and efficient and brighter white emitter for illumination. However, there is a new generation of emitting devices that is in demand of low-manufacturing costs, especially to upscale the emission areas in self-emitting devices (displays and illumination panels). Therefore, solution-processable methods to synthesize the active materials, namely semiconductors, have recently gained great attention due to their ease of synthesis and upscaling advantage towards larger areas. Despite the significant amount of efforts made towards the forthcoming generation of light-emitting devices, there is still one major issue to be addressed. While red and green-emitting devices have been successfully reached efficiencies comparable to the ones required in the present generation, a blue component is lagging. For the above reasons, intense research is going on to fabricate efficient blue-emitting devices using inorganic and hybrid semiconducting materials that can be processed through solution-based methods. Therefore, this thesis focuses on fabricating two prospective blue-luminescent semiconductors prepared by low-cost techniques and their application in multilayered electroluminescent devices, namely thin-film electroluminescent devices and light-emitting diodes. We used zinc sulfide doped with europium as a blue-bright emitter and incorporated it in thin-film electroluminescent devices. Additionally, we explored hybrid halide perovskites as light emitters by tuning their optical band gap, achieving an efficient blue-emitting diode.