| Design of powerful LEDsA modern ultrabright LED is a complicated device which requires many technological stages during its manufacturing process.Presently many leading manufacturers of powerful LEDs are introducing various LED production technologies with the use of different materials and components. Design of a powerful LED includes a semiconducting crystal on a silicon substrate which is installed onto aluminium heat-sink base.Gold-plated jumpers connect the crystal with external package stiff leads - anode and cathode. The design has a solid plastic top.An important stage in creating powerful LEDs is their initial preparation, ie crystal growing, planar treatment of design films, their etching, making of contacts, and metal film covers for contact leads. A film grown on one substrate can be cut into several thousand chips. The next stage is to assemble LEDs from these chips.So it is necessary to install the crystal into a package, make terminal leads, and produce optical coatings.As for white LEDs it is necessary to apply luminophore evenly. Then you have to ensure heat removal from the crystal and package and make a solid plastic top which will focus radiation into required space angle.Increased LED's light flux capacity lead to increased waste heat removal efficiency. This requires maximum contact between the chip and heat-removing base.For instance, design of a powerful LED by LUMILEDS LIGHTING ensures efficient heat removal from the crystal as it is mounted ... |
