In Situ Patterning Perovskite Quantum Dots by Direct Laser Writing Fabrication

Abstract

Perovskite quantum dots have been attractive building blocks for novel photonic devices development, where patterning is usually one of the most critical steps. We report on the combination of in situ fabrication and direct laser writing based on a 405 nm nanosecond laser, which provides an efficient and simple scheme for patterning perovskite quantum dots during the formation process. The as-fabricated gamma phase CsPbI3 quantum dots patterns show bright photoluminescence emission with a quantum yield up to 92%. By varying the key parameters of the direct laser writing, a minimum line width of 900 nm was achieved. A light-emitting optical grating with a period of 4 μm was fabricated and its polarization and structural color characteristics were discussed. The reported approach offers a route for fabricating patterned perovskite quantum dots with designed structures for photonic applications including micro-LED display, anticounterfeiting, and nanolasers.

Fabrication Technologies for the On‐Chip Integration of 2D Materials

“…Reproduced with permission. [ 395 ] Copyright 2021, American Chemical Society. m) 2D MAPbI 3 flat lens.…”

“…Recently, DLW has been used in the fabrication of MXene and 2D perovskite patterns. [ 394–396 ] Figure 5k shows a microcircuit fabricated from MXenes, as a supercapacitor. [ 394 ] In situ patterning of γ‐CsPbI 3 quantum dot‐based films (Figure 5l) was also achieved, [ 395 ] which exhibited bright red PL with a high quantum yield of up to 92%.…”

“…[ 394–396 ] Figure 5k shows a microcircuit fabricated from MXenes, as a supercapacitor. [ 394 ] In situ patterning of γ‐CsPbI 3 quantum dot‐based films (Figure 5l) was also achieved, [ 395 ] which exhibited bright red PL with a high quantum yield of up to 92%. Finally, ultrathin flat lenses in 2D perovskite (Figure 5m) were fabricated by using a femtosecond laser, [ 258 ] where the feature size of the lens rings was ≈400 nm.…”

Fabrication Methods for Integrating 2D Materials

“…Recently, DLW has been used in the fabrication of MXene and 2D perovskite patterns. [381][382][383] Fig. 5(k) shows a microcircuit fabricated from MXenes, as a supercapacitor.…”

Microscale Perovskite Quantum Dot Light‐Emitting Diodes (Micro‐PeLEDs) for Full‐Color Displays

“…[25,26] Therefore, it is a major challenge to prepare micro-PeLEDs with dimensions down to several tens micrometers, together with uniform and intense luminescence. [27] For micro-PeLED displays, a large number of single PeLED pixels are required to form pixel arrays. Inkjet printing (IJP) technology is considered the first choice to prepare single-and self-luminous PeLED pixels, which also promises large-area production.…”