Quantum Dots Synthesis Through Direct Laser Patterning: A Review

Abstract

In this brief review the advances on Direct Laser Patterning (DLP) for the synthesis of photo-luminescent semiconductor quantum dots (QDs) belonging to II-VI groups, especially in solid state using laser-assisted conversion are reported and commented. The chemistry of the precursor synthesis is illustrated because it is a crucial step for the development of the direct laser patterning of QDs. In particular, the analysis of cadmium (bis)thiolate and cadmium xanthates precursors after thermal and laser treatment is examined, with a special focus on the optical properties of the formed QDs. The second part of the review examines how the laser parameters such as the wavelength and pulse duration may regulate the properties of the patterned QDs. The DLP technique does not require complex laser systems or the use of dangerous chemical post treatments, so it can be introduced as a potential method for the patterning of pixels in quantum dot light emitting diodes (QD-LEDs) for display manufacturing.

In Situ Patterning Perovskite Quantum Dots by Direct Laser Writing Fabrication

“…The practical use of direct laser writing strongly relies on its power threshold. In most cases, direct laser writing using a low power laser is much preferred . We then investigated the influence of precursor concentration on the threshold laser power by monitoring the PL intensity with increasing laser power.…”

“…In most cases, direct laser writing using a low power laser is much preferred. 43 We then investigated the influence of precursor concentration on the threshold laser power by monitoring the PL intensity with increasing laser power. As shown in Figure S6, it is found that the PL intensity of the resulting patterned γ-CsPbI 3 PQDs first increased and then decreased with the laser irradiation power increasing from 1.36 to 3.00 mW.…”

Design of cross-linked polyisobutylene matrix for efficient encapsulation of quantum dots

“…22,24,29 Alternatively, nanoparticles can be synthesized directly in a preformed polymer matrix by decomposing suitable precursors under thermal treatment 30 or light irradiation. 31,32 Formation of both the nanocrystals and polymer matrix can occur at the same time. 22 Nevertheless, irrespective of the preparation method of polymer composites with embedded QDs, there are two critical issues which should be solved.…”

Cadmium Telluride Nanocomposite Films Formation from Thermal Decomposition of Cadmium Carboxylate Precursor and Their Photoluminescence Shift from Green to Red

“…The formation of the cadmium-chalcogenide QDs when activated by an external source of energy in the form of heat or radiation is of particular interest, because it can be localized allowing the patterning of the semiconductor QDs. Recently this basic idea has been shown possible by several authors and it is the basis of the direct laser patterning approach, i.e., the process in which the laser source modifies a material to obtain the desired effect (QDs formation) [17] only in specific area of the sample (patterning) [18,19]. To date, the work showed in these papers is focused mainly on the formation of CdS QDs from the cadmium bis(benzythiolate) precursor [20] and only recently of the CdSe QDs from cadmium 2-(N,N-dimethylamino)ethylselenolate [21,22].…”