Microscale Lateral Perovskite Light Emitting Diode Realized by Self-Doping Phenomenon

TL;DR

Researchers developed microscale perovskite light-emitting diodes using a self-doping method, enabling smaller pixel devices for high-definition displays.

Contribution

A novel self-doping approach enables PeLEDs with sub-2 μm pixel sizes, overcoming perovskite solubility challenges in micro/nano fabrication.

Findings

PeLEDs with single pixel sizes below 2 μm were successfully fabricated.

The self-doping method created a PN junction without requiring photoresist processing.

The devices achieved a luminescence lifetime of approximately 3 seconds.

Abstract

High-definition near-eye display technology has extremely close sight distance, placing a higher demand on the size, performance, and array of light-emitting pixel devices. Based on the excellent photoelectric performance of metal halide perovskite materials, perovskite light-emitting diodes (PeLEDs) have high photoelectric conversion efficiency, adjustable emission spectra, and excellent charge transfer characteristics, demonstrating great prospects as next-generation light sources. Despite their potential, the solubility of perovskite in photoresist presents a hurdle for conventional micro/nano processing techniques, resulting in device sizes typically exceeding 50 μm. This limitation impedes the further downsizing of perovskite-based components. Herein, we propose a plane-structured PeLED device that can achieve microscale light-emitting diodes with a single pixel device size < 2 μm and a luminescence lifetime of approximately 3 s. This is accomplished by fabricating a patterned substrate and regulating ion distribution in the perovskite through self-doping effects to form a PN junction. This breakthrough overcomes the technical challenge of perovskite–photoresist incompatibility, which has hindered the development of perovskite materials in micro/nano optoelectronic devices. The strides made in this study open up promising avenues for the advancement of PeLEDs within the realm of micro/nano optoelectronic devices.

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