Publications by authors named "Junhu Cai"
Article Synopsis
- Perovskite light-emitting diodes (PeLEDs) are gaining attention for their potential in advanced displays, with vacuum deposition being a promising manufacturing method due to its efficiency and ease of pixelation.
- A new trisource coevaporation strategy has been introduced to create a specific perovskite structure (MACsPbBr) that enhances carrier confinement and reduces defects, resulting in a significant increase in external quantum efficiency (EQE).
- The study reports the development of the first vacuum-deposited transparent PeLEDs, which feature double-sided emission and a high EQE of 7.6%, and demonstrates their use in a multifunctional intelligent display capable of heart rate detection and imaging.
The growing focus on enhancing color quality in liquid crystal displays (LCDs) and organic light-emitting diodes (OLEDs) has spurred significant advancements in color-conversion materials. Furthermore, color conversion is also important for the development and commercialization of Micro-LEDs. This article provides a comprehensive review of different types of color conversion methods as well as different types of color conversion materials.
View Article and Find Full Text PDFMini-LED backlights energized by quantum-dot color conversion (QDCC) hold great potential for technological breakthroughs of liquid crystal displays. However, luminance uniformity issues should still be urgently solved owing to the large interval of direct-lit mini-LEDs, especially when covering with a QDCC film (QDCCF) with uniform thickness. Herein, we propose a uniformity improvement approach of mini-LED backlights by employing a QDCCF with nonuniform thickness based on the Lambertian distribution of mini-LEDs, which is demonstrated by screen-printing preparation and ray-tracing simulation.
View Article and Find Full Text PDFPerovskite Quantum Dots for Emerging Displays: Recent Progress and Perspectives.
Nanomaterials (Basel)
June 2022
The excellent luminescence properties of perovskite quantum dots (PQDs), including wide excitation wavelength range, adjustable emission wavelength, narrow full width at half maximum (FWHM), and high photoluminescence quantum yield (PLQY), highly match the application requirements in emerging displays. Starting from the fundamental structure and the related optical properties, this paper first introduces the existing synthesis approaches of PQDs that have been and will potentially be used for display devices, and then summarizes the stability improving approaches with high retention of PQDs' optical performance. Based on the above, the recent research progress of PQDs in displays is further elaborated.
View Article and Find Full Text PDFArticle Synopsis
- - The synthesis of all-inorganic perovskite quantum dots (IPQDs) can be improved by using an environmentally friendly ion-exchange method with a low-cost resin, which addresses current sustainability issues in traditional processes.
- - This method enhances the optical performance and surface quality of the IPQDs, allowing for precise control over their emission wavelengths while maintaining their crystal structure.
- - The resulting IPQDs exhibit high photoluminescence quantum yields and improved fluorescence lifetimes, making them suitable for use in high-quality, color-rich light-emitting diodes (LEDs) for display applications.
This Letter proposes the use of atomic layer deposition (ALD) encapsulation as a stability-improving approach for a quantum-dot micro-structural array (QDMA) with a random rough interface. The QDMA is first prepared by screen printing technology on an edge-lit light-guide plate (LGP) for backlight application. A flexible aluminum oxide film is then densely deposited onto the rough surface of the QDMA.
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