Inorganic halide perovskites color-conversion layers fabricated using pulsed laser deposition for microled displays

The fabrication of full color microLED displays with a small pixel pitch represents a technological challenge. Halide perovskites are materials with interesting optoelectronic properties and a higher absorption coefficient, which could in theory address color conversion for pixel pitches of 1 µm. In this study, inorganic halide perovskite thin films are manufactured using Pulsed Laser Deposition. Their potential for use in color conversion layers is investigated. Their optical properties are measured by photoluminescence. The color emitted is pure and the emission is uniform on 200 mm wafers. Photoluminescence under constant optical flux indicates a high stability of the color convertors. The high absorption coefficient measured confirms they could be used for microLED with smaller pixel pitches. These properties indicate that pulsed laser-deposited inorganic halide perovskite thin films are promising candidates for microLED color conversion, especially for pixel pitches of 1 µm or below.