Resin-Free Quantum Dot Color Converters—Applications and Challenges to Address

Quantum dot color converters (QDCCs) have emerged as a promising technology for enhancing the color gamut and efficiency of display applications, notably in QD-OLED TVs. Moreover, they offer a potential solution for realizing full-color microLED displays, which are highly sought-after for their superior brightness, contrast, and energy efficiency, particularly in demanding applications like augmented reality (AR). However, the implementation of QDCCs in high-resolution AR displays faces a significant hurdle: the inherently low absorption cross-section of non-cadmium-containing quantum dots (QDs), such as InP. This limitation necessitates thick QDCC layers to achieve sufficient color conversion, which can lead to lower wall plug efficiencies and compromise the optical performance of the display.

In this talk, we demonstrate a novel approach to address this challenge by densely packing InP QDs while preserving their color conversion efficiency. We demonstrate green-emitting InP QDCCs with a photoluminescent quantum yield (PLQY) exceeding 60% (in reflectance configuration) and an optical density of 1 at a thickness of less than 10 µm. This achievement represents a significant advancement towards realizing high-performance, thin-film QDCCs for microLED displays. Furthermore, we outline the reliability challenges associated with high-flux operation, a critical consideration for microLED applications. We highlight the need for further research to address these challenges and enhance the stability of QDCCs under demanding operating conditions. We believe that overcoming these obstacles will solidify the position of QDCCs as a viable and attractive option for commercializing full-color microLED displays across a wide range of applications, from large-format TVs to compact AR devices. This work not only contributes to the development of next-generation display technologies but also underscores the importance of continued research in materials science and engineering to address the evolving needs of the ever-advancing electronics industry.