Quantum dot color conversion layers have the potential to greatly improve the efficiency and color performance of displays including and beyond liquid crystal displays. To fully realize these improvements, the quantum dots must be deposited and patterned at high resolution. One promising method for achieving this is through inkjet printing. In this paper we report on the fabrication and characterization of quantum dot inks, as well as films made from inkjet deposition of these materials.
Quantum dot color conversion (QDCC) can enable OLED‐based displays with higher brightness and wider color gamut, and microLEDs with higher efficiencies and manufacturing scalability. Key to employing QDCC is the development of quantum dot (QD) materials with enhanced blue absorption, high quantum yield and narrow, tunable emission. Nanosys has developed new heavy metal‐free QDs that meet all these requirements and enable the fabrication of patternable QDCC films with high (>38%) photon conversion efficiency and gamut coverage.
Quantum dot color conversion technology will lead to displays with higher brightness, color tunability and viewing angles. We have developed Cd‐free QD‐photoresist (QDPR) formulations containing specially designed QDs with enhanced blue absorption and green/red emission to achieve >90% BT.2020 coverage at feature resolution of µ10 mm. QDPR devices can be fabricated on existing lithographic equipment, making this technology attractive for all kinds of displays including LCD, OLED and microLED.
In addition, there is a continued need to develop and apply biomarkers that can be used to provide real-time detection of excessive exposure to hazardous substances in the workplace, especially from unexpected fugitive emissions. These topics are discussed in the review.
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