92‐1: Invited Paper: Wide‐Color‐Gamut and Stable MicroLED Displays Using UV‐Pumped Cd‐Free Quantum Dots

Abstract

Applied Materials, Inc. has reported a novel and manufacturable microLED display architecture, featuring UV‐A microLEDs, 4‐subpixel layout, pixel isolation wells filled with inkjetted Cd‐free R/G/B quantum dots (QDs), and a blanket UV blocker on top. A 1.37” smart‐watch active‐matrix display prototype was assembled using such method. Our QDs, including blue QD and the matrix materials exhibit excellent stability under UV excitation, as verified by accelerated lifetime test under higher UV flux and elevated temperature. The emission properties of our R/G/B QDs was further optimized, paving a path to achieve 99% DCI‐P3 color space coverage. Our display demonstrates a highly uniform Lambertian emission pattern with minimal color shift at high viewing angles, attributing to all emissions originating from QD embedded in the same polymer matrix. Furthermore, we can eliminate the QD photon‐brightening effect and demonstrate display with high thermal stability up to 90⁰C.