LEDs: Optimised light extraction through lens-like casting

The light conversion layer of the 'DoubleDome' LEDs is based on a two-phase development procedure especially developed by Sharp for this purpose. A layer of phosphorous for the conversion of white light is applied in a first step. The installation of the globe top made from transparent silicone in a second step makes light extraction possible without spreading loss.

A high-quality ceramic plate serves as the LED carrier material instead of the plastic materials that are traditionally used. This allows efficient heat dissipation and helps to keep the required cooling element small.

The high colour rendering LEDs reach the high CRI value of 85 through the combination of blue LEDs with a special blend of green and red phosphorous. The SMD LEDs from the new GM2BBxxBM0C series ensure high colour fastness and attention to detail, which are vital everywhere where light must not distort the depiction of objects. Typical applications for high colour rendering (HCR) LEDs include photography, shop windows, shop lighting and merchandise presentation, as well as in medical technology.

As different applications also require different lighting concepts, the 'DoubleDome' series is available in three different shades of white. Starting with 'Warm White' with 3,000K, and 'Natural White' with 4,000K to 'Pure White' with 5,000K. In combination with the high CRI values, the new HCR LEDs from Sharp are approximately equivalent to conventional fluorescent tubes with regard to their efficiency, colour temperature and colour rendering index (CRI). The HCR LEDs thus already correspond today to the requirements of the Energy Star Programme.

Sharp's 'Double Dome' LEDs, which are solderable according to the reflow method, are scarcely bigger than the head of a match. Thanks to its low space requirements of 2.8 x 2.8 x 1.9 mm, the new LED series GM2BBxxBM0C is predestined for use in a whole variety of application areas that require a high degree of brightness in combination with compact design. The minimum form factor and the high CRI value of the new 'DoubleDome' series from Sharp give light designers new freedom in light design. Furthermore, LEDs offer the benefits of high light efficiency. The 'Double Dome' series is already tried and tested and used in large volumes in the LED backlighting of LCD televisions and is particularly predestined for applications in surface lighting such as the ceiling lighting of office rooms and factories. Other typical application areas include sales area lighting, street lighting, architectural lighting and display lighting.