High-brightness LEDs have encountered some technical challenges in high-quality, low-cost mass production, which creates good opportunities for breakthrough solutions, especially for start-up companies with “breakthrough thinkingâ€. They are trying some interesting nanotechnology solutions. An important aspect of innovation is that materials, quantum dots and constrained crystal structures in the substrate may have the potential to achieve higher efficiency and lower cost. Of course, some of the more mature companies also have some groundbreaking solutions, such as using RF waves instead of visible light to test the chip for better yield control feedback. One way to obtain more ideal warm white light from a bright LED is to use a quantum dot instead of a red phosphor for light conversion. QD Vision claims that its semiconductor nanocrystals can be tailored to specific narrow-band light waves based on particle size and material, resulting in a 30% increase in lumens per watt of LED light compared to the phosphor conversion scheme. The luminaire manufacturer uses a quantum dot film to cover the LED light to fine tune the color of the light. QD Vision is currently shipping to luminaire manufacturers on a large scale. The company's CTO and co-founder Seth Coe-Sullivan said that the company is also interested in the LED backlight market, and plans to launch related products next year. For backlight products, coatings coated with nanocrystalline ink can be directly used in blue LEDs, replacing phosphors, improving display performance, and allowing more light to pass, improving power efficiency by about one-third. Coe-Sullivan claims to introduce a complete quantum dot series without cadmium, which can continuously emit 20-30mW/cm2 light intensity without change. Start-up company Jingneng Optoelectronics manufactures commercial high-bright blue LEDs on silicon substrates Chinese startup Lattice Power (Nanchang, China) is manufacturing high-brightness LEDs on silicon substrates. Small blue and green LEDs for display devices are in volume production, and general-purpose lighting products for LCD backlights and large-size chips are coming soon. Its unique technology comes from the research results of Professor Jiang Fengyi and his research team at Nanchang University. The deposition of GaN layer on silicon instead of sapphire or SiC can better control thermal mismatch and lattice mismatch. Recently, Lattice obtained some patents and published research progress at some technical conferences. One of the products obtained 100 lumens of cool white light from a 1×1mm blue chip at 350mA, and the substrate was on a (111)2 inch silicon substrate. Upper deposited InGaN/GaN. Researchers say the accelerated life test results show that the reliability of the product is similar to the LED on the sapphire. Lattice Power researchers are also working on larger silicon wafers to further increase cost efficiency. The current 200×200μm blue-green chip products are mainly used on large displays, and the company is also advancing the process of using larger chips for highlighting applications. “We are currently limited by capacity and are increasing our MOCVD capacity,†said Dr. Lu Bo, Executive Vice President of the company. As capacity expands, Crystal Energy plans to sell Blu-ray chips to packaging manufacturers for LCD backlighting and general illumination.
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