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Novel materials can greatly improve the performance and reliability of lighting and display products, and also substantially lower the cost of manufacturing. NAMI has explored the use of innovative materials such as Thermal Interface Materials (TIM), Quantum Dots (QD) and reflective coating for the enhancement of product performance and reliability. We have also developed novel inks for Printed Electronics (PE) as a low cost high volume manufacturing technology for lighting, display and other electronic products.
Lighting accounts for 15-20% of total electricity consumption in urban cities like Hong Kong. Incandescent bulbs and fluorescent lamps are giving way to more energy efficient lighting devices. Solid state lighting, which uses semiconductor light-emitting diodes (LEDs) as the light emission devices, has been enjoying a double-digit growth since 2010. However, widespread use of LED is still limited by its high production cost comparing to that of traditional light sources. Novel nano materials and innovative technologies are being introduced not only to reduce manufacturing costs but also to extend its lifetime to make LED more affordable for mainstream market.

NAMI is expanding the application of our successful thermal interface material (TIM) beyond high brightness LED to high power Plasma Lighting for efficient heat dissipation. Plasma lighting offers a natural light spectrum and utilizes an energy efficient small point source for optimal light distribution and controllability. NAMI's TIM as well as conductive and reflective coatings enable Plasma Lighting to be scaled up to over 1500W and beyond, providing the required reliability and thermal management for applications in street lighting, outdoor stadium lighting, and horticultural growth lighting.

Printed electronics represent a revolutionary technology for fabricating electronic devices on flexible materials such as paper, plastic, and textiles. Low cost and high throughput manufacturing is achieved through large area roll to roll printing processes. The simpler development and manufacturing processes of PE reduce the barrier to entry to market. Flexible lighting, displays, animated signage, smart labels, sensors, disposable diagnostic devices, and printed battery are examples of such applications. NAMI has leveraged its expertise in material and solution processing to develop innovative metal and semiconductor inks for novel printed sensing, memory, logic, lighting and display devices.
LED on Silicon (LEDoS)
NAMI worked with our collaborative partners to integrate high performance MOCVD LED fabrication technology and mature silicon manufacturing technology in LEDoS. The LED arrays are placed directly onto the silicon substrates through flip chip process. Active matrix circuits of transistors which control the light emission of the LEDs individually are fabricated on silicon wafers. The silicon submount provides a short thermal path as it readily conducts heat away from the device. One of the major advantages of LEDoS is to eliminate backlight, color filters and polarization optics that are required by LCD devices. LEDoS is reliable as it is fabricated with long lifetime components. It maintains high brightness even under bright sunlight condition. These advantages render them very attractive for display and personal projector applications.
High Thermal Conductive Die Attach Adhesive
The lifetime of High Brightness LED (HB-LED) is adversely affected by its high power density due to excessive heat generated within a small die. The thermal management of HB-LED becomes very critical. NAMI has developed a low cost one-component Die Attach Adhesive (DAA) using nano conductive filler with high thermal conductivity, low cure temperature, and relatively high storage temperature. We have licensed this novel material to multiple industrial partners for LED applications, and are also working with additional partners to expand its application to high power lighting as well as electronic products where high power devices like RF components are involved.
Quantum Dots
Quantum dots are luminescent compounds with their emission spectra able to be precisely controlled by manipulation of their sizes. NAMI has developed a cost-effective and green process for large scale synthesis of luminescent quantum dots. The QDs are functionalized with a core-shell structure to achieve a precisely controlled luminescence and also to facilitate stable dispersion in suitable application media such as a polymer nanofiber mat. This kind of QD-Mat with precisely tuned emission spectrum can directly replace phosphors in LED, be used to improve the color quality of LCD display, and also be used to target specific plants in growth light applications.
Silicon Nanostructures Inks and Printing Techniques
Semiconductor, like Silicon, is the heart of nearly all electronic devices. NAMI has developed and patented a solution based method to fabricate an innovative Silicon nano ink. This ink, in either nanoparticle or nanowire form, is the key ingredient in many printed electronic devices that NAMI is developing. The application areas of these printed devices include sensing, memory, logic, display and lighting.
Printed Organic LED
Organic LED (OLED) is perceived to be the next generation solid state lighting and display mainly due to its high color quality. At present, OLED cost is still significantly higher than LCD display, and is limiting its use to high end products. NAMI has developed a low cost printing method to fabricate OLED with all solution based processing without the need for costly high vacuum process. Printing techniques can be easily scaled up for large area processing and also applied on flexible substrates in the markets of lighting, display, and projector applications.