Publication date: 15th December 2025
Colloidal quantum dots (QDs) have gained significant attention as promising emissive materials due to their outstanding optical properties, including tunable emission wavelengths, narrow spectral bandwidths, and excellent photoluminescence quantum efficiency (PLQE). QDs based on cadmium or lead, such as CdSe, CdS, PbS, and CsPbBr3, have been extensively studied, benefiting from mature synthetic protocols and well-established application techniques. However, concerns over their toxicity, environmental impact, regulatory constraints continue to limit their widespread commercialization., especially in consumer display applications. Consequently, indium phosphide (InP)-based QDs have emerged as an attractive, lower-toxicity alternative for visible-range emitters. Despite this promise, achieving high optical quality in InP QDs remains challenging due to their relatively high covalent bonding nature, which makes them more susceptible to oxidation and complicates to control of structural defects. These intrinsic characteristics have resulted in broader emission linewidths, lower PLQE, and reduced operational stability compared to CdSe-based QDs.
In this talk, I will introduce our advances in the development of InP-based QDs that exhibit nearly unity PLQE and remarkably high stability during both device fabrication and operation. Leveraging these superior optical properties, the InP QDs can be effectively utilized as color-conversion layers for multiple types of blue light sources, including OLEDs and micro-LEDs. In particular, the integration of red-emitting QDs with blue micro-LEDs presents a compelling solution to the long-standing issue of low external quantum efficiency in red micro-LEDs, especially at sub-50-um pixel sizes. This approach enables high-resolution displays with wide color gamut, low energy consumption, and improved manufacturability. Overall, these results highlight the strong potential of QDs to serve as a commercially viable, environmentally responsible, and highly efficient platform for future display technologies.
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