Self-Assembled and Wavelength-Tunable Quantum Dot Whispering-Gallery-Mode Lasers for Backlight Displays

Abstract

Thanks to the narrow line width and high brightness, colloidal quantum dot (CQD) lasers show promising applications in next-generation displays. However, CQD laser-based displays have yet to be demonstrated because of two challenges in integrating red, green, and blue (RGB) lasers: absorption from red CQDs deteriorates the optical gain of blue and green CQDs, and imbalanced white spectra lack blue lasing due to the high lasing threshold of blue CQDs. Herein, we introduce a facile surfactant-free self-assembly method to assemble RGB CQDs into high-quality whispering-gallery-mode (WGM) RGB lasers with close lasing thresholds among them. Moreover, these RGB lasers can lase nearly independently even when they are closely integrated, and they can construct an ultrawide color space whose color gamut is 105% of that of the BT.2020 standard. These combined strategies allow us to demonstrate the first full-color liquid crystal displays using CQD lasers as the backlight source.

Multi‐Interfacial Confined Assembly of Colloidal Quantum Dots Quasisuperlattice Microcavities for High‐Resolution Full‐Color Microlaser Arrays

“…[1][2][3][4][5][6] To boost their commercial applications with high performing, the controllable assembly of CQDs is required to construct programmable micro/nanostructure arrays with long-range order. [7][8] In comparison to their organic counterparts, the fabrication of CQDs can only utilize solution processes due to their specific structure composed of an inorganic core and organic ligand shell. [9][10][11][12] For high-resolution assembly of CQD micro/nanostructures, the mainstream strategy is reducing the size of liquid droplets of CQD solution.…”

Waveguide-Integrated Colloidal Nanocrystal Supraparticle Lasers

“…SPs represent a novel family of NC lasers that retain the attractive properties of NCs, while also offering the advantage of combining a microsize resonating structure and straightforward fabrication. SP lasers are being researched as unbound structures in biological and medical applications, but interest in their use when embedded within optoelectronics is now accelerating . Nevertheless, there is a lack of techniques capable of manipulating individual SPs for their deterministic placement on a substrate or within a system, which is a current major obstacle to their implementation in integrated photonics.…”

“…SP lasers are being researched as unbound structures in biological and medical applications, 19 but interest in their use when embedded within optoelectronics is now accelerating. 20 Nevertheless, there is a lack of techniques capable of manipulating individual SPs for their deterministic placement on a substrate or within a system, which is a current major obstacle to their implementation in integrated photonics.…”