AlGaN-Based Deep-UV Micro-LED Array for Quantum Dots Converted Display With Ultra-Wide Color Gamut

Abstract

Deep-ultraviolet (Deep-UV) micro light-emitting diodes (Micro-LEDs) array greatly benefits various future applications. In this letter, we fabricated Deep-UV Micro-LEDs with different geometries from <inline-formula> <tex-math notation="LaTeX">$10 \times 10\,\,\mu \text{m}$ </tex-math></inline-formula>² to <inline-formula> <tex-math notation="LaTeX">$200 \times 200\,\,\mu \text{m}$ </tex-math></inline-formula>², and investigated its application on tristimulus quantum dots converted display. As the Micro-LEDs scaling, the smaller-sized devices provided higher brightness under the same injection current density due to the enhanced current spreading uniformity and heat dissipation. For a <inline-formula> <tex-math notation="LaTeX">$10 \times 10\,\,\mu \text{m}$ </tex-math></inline-formula>² device, the maximal optical power density was up to 185 W/cm² at 5 kA/cm², and the peak external quantum efficiency reached 3.43 &#x0025; at 30 A/cm². The device exhibited a minor blue shift phenomenon as the current density increased. Deep-UV Micro-LED stimulated quantum dots display obtained 121&#x0025; of the Rec. 2020 standard in the CIE 1931 color space. This ultra-wide color gamut indicated it as a competitive candidate for future display technology.