Lighting Beyond Blue: Ultraviolet Metal Halide Perovskite Light-Emitting Diodes
ORAL
Abstract
The evolution of ultraviolet (UV) optoelectronics prompts an exploration into high-performance, economically efficient alternatives beyond traditional substrates such as Gallium Nitride (GaN) and Aluminum Gallium Nitride (AlGaN). This study underscores the potential of two-dimensional (2D) metal halide perovskites, which are becoming indispensable due to their stability, tunable bandgap, and potential for scalable applications. Metal halide perovskite LEDs (PeLEDs) in visible wavelength regimes have emerged as formidable counterparts to traditional III-V LEDs, attributed to their high efficiency, tunable emission spectra, and fiscal feasibility. By engineering the perovskite materials and electrical device structures, we have achieved violet PeLEDs with an external quantum efficiency (EQE) peak of 0.41% at an emission wavelength of 408 nm. And ultraviolet PeLEDs with an EQE of 0.10%, emitting at 399 nm. This work not only enriches the scientific community's comprehension of 2D perovskites but also provides a perspective to improve the performance of large bandgap perovskite LEDs and suggest facile methods for the design and development of other large bandgap perovskite LEDs in the future.
*We acknowledge the support of the Department of Electrical Engineering at Stanford University. A portion of this work was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS-2026822.
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Publication:1. Manchen Hu, Sebastian Fernandez, Qi Zhou, Pournima Narayanan, Balreen Saini, Tracy H. Schloemer, Junrui Lyu, Arynn O. Gallegos, Ghada H. Ahmed, and Daniel N. Congreve. "Water additives improve the efficiency of violet perovskite light-emitting diodes." Matter 6, no. 7 (2023): 2356-2367. 2. Manchen Hu, Natalia Murrietta, Junrui Lyu, and Daniel N. Congreve. "Two-dimensional perovskite materials towards violet and ultraviolet light-emitting diodes." In UV and Higher Energy Photonics: From Materials to Applications 2023, vol. 12652, pp. 29-35. SPIE, 2023.
