Manufacturing a high-transmittance quantum-dot pixel frame using magnetic field and vibration field composite stamping

Abstract

A simple way to complement full-color micro-light-emitting diode (micro-LED) displays is to employ ultraviolet or blue micro-LEDs with quantum dot (QD) converters. A pixel frame is essential for precisely locating the QD converter on a micro-LED chip and to limit the optical cross-talk effect. The limitations of pixel frames prepared by the commonly-used lithography technique, such as shallow depth and high dependence on high-transmittance substrates, have not been resolved in previous studies. In this study, we propose a magnetic-vibration composite stamping (MVCS) process to prepare a high-aspect-ratio and high-transmittance QD pixel frame. Magnetic extinction particles were employed, regulated, and converged into the wall of the pixel frame under the combined function of magnetic and vibration fields. Compared with the pixel frame prepared by the traditional stamping process, the pixelated QD converter achieved a 4.5-fold increase in the maximum photoluminescence intensity. Combining the micro-LED and pixelated QD converters in the pixel frame prepared by MVCS provides an alternative and practical approach for full-color micro-LED displays.