High-Resolution Perovskite Light-Emitting Touch-Sensitive Device via Trowel-Coating Technique

Document Type : Original Article

Authors

Laser and Plasma research Institute, Shahid Beheshti University

Abstract

There is a growing demand for touch devices, including displays, fingerprint sensors, and other pattern recognition systems. Recent advances in light-emitting diode (LED) materials have opened up new possibilities for developing emissive touch devices. In such systems, touching the LED causes a visible glow in a fine pattern, which can be utilized in various applications. Here, a perovskite LED (PeLED) is turned into a touch device. Such a device, on one hand, needs a uniform and high-resolution emitting layer, and on the other hand, a flexible and thin top electrode. The uniformity, and hence the resolution of the device, is achieved by an innovative coating method. Instead of the conventional spin-coating technique, the emitting layer solution is dropped onto a glass substrate and then uniformly distributed by troweling another glass substrate across it. This process forms a thin, uniform perovskite layer with fine and small microcrystals, which is well-suited for high-resolution touch applications. With this device, we succeeded in recording the pattern of a fingerprint with a resolution of about "100 nm", which was stable after repeatedly touching the device. However, further work is needed to evaluate the reproducibility and scalability of the proposed fabrication method for industrial applications.

Keywords

Pioneering Advances in Materials
Volume 1, Issue 1
January 2026
Pages 48-59

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