Enhanced Short-Wavelength Perovskite UVLEDs: Fabrication and Optimization of (PEA)₂PbBr₃Cl Devices with Poly-TPD Hole Transport Layers

High Resolution Image Download MS PowerPoint Slide Light-emitting diodes (LEDs) based on 2D perovskites have attracted extensive interest due to their outstanding optical and electronic characteristics and potential applications in lighting, displays, and electronics. However, the development of short-wavelength perovskite UVLEDs remains relatively underexplored, primarily due to material limitations and challenges in process optimization. In this study, we report the fabrication of (PEA) 2 PbBr 3 Cl 2D perovskite ultraviolet-LEDs via a solution-processing approach, with an emphasis on enhancing device efficiency through optimized hole transport. A Poly-TPD interlayer was introduced between the hole injection layer (PEDOT:PSS) and the emissive layer ((PEA) 2 PbBr 3 Cl) at varying concentrations. Comprehensive characterization using photoluminescence, electroluminescence, X-ray diffraction analysis, field-emission scanning electron microscopy, and atomic force microscopy revealed that a Poly-TPD concentration of 2 mg/mL resulted in optimal device performance. The fabricated UV-LED exhibited a maximum luminance of 245.9 cdm –2 and an external quantum efficiency (EQE) of 2.41%, providing valuable insights into the advancement of short-wavelength (401 nm emission) 2D perovskite UVLEDs.