Dr Xiaoxi He, Research Director at IDTechEx08.09.23
Quantum dots (QDs) are semiconductor nanocrystals ranging from 2-10 nanometers (10-50 atoms) with size-tunable features. They exhibit quantum confinement effects due to their nanoscale dimensions, leading to remarkable optical and electrical characteristics. The quantum dot features can be adjusted by particle size, material, and composition.
QD materials such as Cd-based, In-based, PbS, perovskites, as well as emerging CuInS2, InAs, ZnTeSe QDs have varied bandgap and thus absorption and emission spectra. This fine-tuning ability has resulted in quantum dots' significant application potential, notably in display, image sensors, photovoltaic, lighting, and various other use cases.
Since first discovered in 1980, QDs have demonstrated immense potential in transforming display, image sensor, photovoltaic, lighting and greenhouse film technologies with commercial products.
The new report, "Quantum Dot Materials and Technologies 2024-2034: Trends, Markets, Applications", provides IDTechEx's technology roadmap considering how the technology mix in various applications will be transformed with time.
The evolution of QD integration approaches in displays is examined in the report, highlighting the dominance of the film-type adoption over the obsolete edge optic. Nevertheless, emerging approaches such as QD color filters for OLED and micro-LED (μLED) or on-chip type are gaining momentum, facilitated by material advancements and fabrication technique improvement, which could eventually surpass the film type.
Additionally, this analysis recognizes QDs as the ultimate emissive material for displays, tracking efficiency, and lifetime improvements while delving into persistent challenges regarding performance, lifetime, deposition/patterning, and device design.
An intriguing possibility arises as they can be combined with a silicon Read-Out Integrated Circuit (ROIC) to form a hybrid QD-Si NIR/SWIR image sensor. This innovative integration presents a potential pathway towards achieving high-resolution small-pixel silicon-based NIR/SWIR sensors, eliminating the necessity for heterogeneous hybridization of indium gallium arsenide (InGaAs) sensors with Si ROIC. The low-cost hybrid QD-based image sensors can not only target applications traditionally realized by InGaAs SWIR image sensors but also help to reach new applications.
With the first generation of products already on the market and giants also getting involved in this area, the promise of this technology remains strong. This report explores hybrid QD-Si image sensors that can simultaneously achieve high resolution, low pixel pitch, and global shutter with potentially low costs. Technology analysis and player introductions are provided within the IDTechEx report as well.
QD-based LEDs can achieve excellent color rendering indices (CRI) and color temperatures, making them suitable for a variety of lighting applications, including indoor and automotive lighting. Moreover, the narrow emission spectra of QDs reduce the need for complex filtering, enhancing energy efficiency and reducing light pollution.
By engineering the bandgap of quantum dots to match specific regions of the solar spectrum, these cells can efficiently capture a broader range of light wavelengths, as well as enable multiple exciton generation" (MEG) effect, allowing improved light harvesting, higher conversion efficiencies, and better performance under low-light conditions. They can also offer the potential for flexible and transparent photovoltaic applications.
With in-depth technological research and analysis on the QD topic, the IDTechEx report "Quantum Dot Materials and Technologies 2024-2034: Trends, Markets, Applications" provides data-driven evaluation and insights from years of accumulation on QD topic research. The roadmap comprehensively examines the integration of QDs for various applications with outlook.
Challenges such as toxicity concerns, long-term stability, and large-scale manufacturing techniques and costs must be addressed. Researchers are actively exploring non-toxic and more stable materials to overcome these hurdles. Additionally, advancements in QD synthesis techniques and manufacturing processes are likely to drive down production costs and promote widespread adoption in commercial applications.
QD materials such as Cd-based, In-based, PbS, perovskites, as well as emerging CuInS2, InAs, ZnTeSe QDs have varied bandgap and thus absorption and emission spectra. This fine-tuning ability has resulted in quantum dots' significant application potential, notably in display, image sensors, photovoltaic, lighting, and various other use cases.
Since first discovered in 1980, QDs have demonstrated immense potential in transforming display, image sensor, photovoltaic, lighting and greenhouse film technologies with commercial products.
The new report, "Quantum Dot Materials and Technologies 2024-2034: Trends, Markets, Applications", provides IDTechEx's technology roadmap considering how the technology mix in various applications will be transformed with time.
Display: Successful Application?
In display technology, QDs have found extensive use as a color-enhancing component offering a wider color gamut, higher color accuracy, and increased brightness compared to a traditional liquid crystal display (LCD). The unique photoluminescent property of emitting specific wavelengths of light upon excitation enables QDs to convert blue light from LEDs into pure red and green, thus achieving a more extensive and precise color palette.The evolution of QD integration approaches in displays is examined in the report, highlighting the dominance of the film-type adoption over the obsolete edge optic. Nevertheless, emerging approaches such as QD color filters for OLED and micro-LED (μLED) or on-chip type are gaining momentum, facilitated by material advancements and fabrication technique improvement, which could eventually surpass the film type.
Additionally, this analysis recognizes QDs as the ultimate emissive material for displays, tracking efficiency, and lifetime improvements while delving into persistent challenges regarding performance, lifetime, deposition/patterning, and device design.
Emerging Dominance: Quantum Dots in Image Sensors?
Lead sulfide QDs offer the advantage of tunability across an extensive spectrum of wavelengths, making them suitable for near-infrared (NIR) or short-wave infrared (SWIR) sensing applications.An intriguing possibility arises as they can be combined with a silicon Read-Out Integrated Circuit (ROIC) to form a hybrid QD-Si NIR/SWIR image sensor. This innovative integration presents a potential pathway towards achieving high-resolution small-pixel silicon-based NIR/SWIR sensors, eliminating the necessity for heterogeneous hybridization of indium gallium arsenide (InGaAs) sensors with Si ROIC. The low-cost hybrid QD-based image sensors can not only target applications traditionally realized by InGaAs SWIR image sensors but also help to reach new applications.
With the first generation of products already on the market and giants also getting involved in this area, the promise of this technology remains strong. This report explores hybrid QD-Si image sensors that can simultaneously achieve high resolution, low pixel pitch, and global shutter with potentially low costs. Technology analysis and player introductions are provided within the IDTechEx report as well.
Quantum Dots: Illuminating the Future of Lighting?
Existing commercial products are based on QDs' photoluminescent features and have demonstrated remarkable potential in lighting technologies. They can be integrated into LED lighting systems as color converters, enabling the production of tunable and high-quality white light.QD-based LEDs can achieve excellent color rendering indices (CRI) and color temperatures, making them suitable for a variety of lighting applications, including indoor and automotive lighting. Moreover, the narrow emission spectra of QDs reduce the need for complex filtering, enhancing energy efficiency and reducing light pollution.
Quantum Dots in Photovoltaics: Yes or No?
QDs can be potentially integrated into photovoltaic (PV) devices, leading to the emergence of third-generation solar cells.By engineering the bandgap of quantum dots to match specific regions of the solar spectrum, these cells can efficiently capture a broader range of light wavelengths, as well as enable multiple exciton generation" (MEG) effect, allowing improved light harvesting, higher conversion efficiencies, and better performance under low-light conditions. They can also offer the potential for flexible and transparent photovoltaic applications.
Quantum Dots: Changing and Expanding Applications?
QDs can provide added value to existing technologies in various applications from both their photoluminescent and electroluminescent features. The potential to reshuffle the supply chain for different case cases also brings new opportunities to relevant players.With in-depth technological research and analysis on the QD topic, the IDTechEx report "Quantum Dot Materials and Technologies 2024-2034: Trends, Markets, Applications" provides data-driven evaluation and insights from years of accumulation on QD topic research. The roadmap comprehensively examines the integration of QDs for various applications with outlook.
Challenges such as toxicity concerns, long-term stability, and large-scale manufacturing techniques and costs must be addressed. Researchers are actively exploring non-toxic and more stable materials to overcome these hurdles. Additionally, advancements in QD synthesis techniques and manufacturing processes are likely to drive down production costs and promote widespread adoption in commercial applications.