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The active layers in a QD laser have a lower threshold current and a higher differential gain, so the laser is much more efficient. Creation of electrons and holes is also much more efficient. QD lasers provide temperature-independent output at above room temperature. They provide optical gain using 10 layers of quantum dots doped with p-type material, and they have low parasitic capacitance. Phosphors A phosphor is made from a host material and an activator; the activator prolongs the emission time.

Com Page 41 © Copyright Pira International Ltd 2007 Advances in Photonics for Lighting and Energy Leading photonics suppliers and users Canon decided to make OLED displays in 2006 as part of a plan to bring more production of key parts in-house and reduce procurement costs. It is planning to replace LCDs with OLED displays in its digital cameras, camcorders and printers. Cotco International 6/F, Photonics Centre, No. com Paul Lo founded Cotco International Ltd in 1982. It has over 10 years’ experience and expertise in high-brightness LED lamps, displays and modules, and has developed strong design and manufacturing capabilities in LED technology.

In a fixed array, latitude plus 15° is widely accepted to give the best mean performance with minimal seasonal variation. Page 34 © Copyright Pira International Ltd 2007 Future trends in photonics 5 This chapter considers future trends in photonic materials such as LEDs, solar LEDs and fibre optics. It covers higher solar conversion efficiencies from new solar cell materials that could one day be mass-produced. It describes advances in solar cells such as silicon processing, thin film processing, transparent conductors and nanoparticle processing.

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