Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO26)
Publication date: 22nd April 2026
Organic–inorganic metal halide perovskites have attracted significant attention as next-generation light-emitting materials owing to their high color purity, tunable emission, high photoluminescence quantum yields (PLQYs), and compatibility with low-cost solution processing. Despite rapid progress in perovskite light-emitting diodes (PeLEDs), several challenges remain, including severe efficiency roll-off, limited operational stability, and poor reproducibility, which restrict their practical applications in lighting and displays. In this work, we systematically investigate the key factors governing the performance of quasi-2D PeLEDs. The study focuses on three main aspects: device architecture optimization, substrate-dependent perovskite crystallization, and organic spacer cation engineering. First, by analyzing charge injection, carrier transport, and interfacial recombination, an optimized device structure was developed to promote balanced charge injection and efficient exciton formation within the emissive perovskite layer, leading to improved device performance and reduced efficiency roll-off [1]. Second, the influence of different organic hole transport layers (HTLs) was examined. The results reveal that, beyond hole mobility and energy-level alignment, the chemical nature and surface properties of the underlying substrate strongly affect the crystallization kinetics, domain distribution, and morphology of solution-processed quasi-2D perovskite films, thereby significantly influencing PeLED performance [2]. Finally, a series of organic spacer cations was explored to regulate quasi-2D perovskite phase distribution and promote efficient cascade energy transfer from low-n to high-n domains, resulting in high quality emissive films with enhanced PLQYs and improved spectral stability [3–6]. Overall, this work provides a comprehensive understanding of how interface engineering, substrate selection, and spacer cation design can be combined to realize efficient, stable, and reproducible quasi-2D PeLEDs. These findings offer useful design guidelines for developing solution-processed perovskite photonic sources for future solid-state lighting and display technologies.
M. U. Ali gratefully acknowledges support from the University Research Committee of The University of Hong Kong for conference participation.
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