Işık yayan diyotlarda enerji verimi analizi ve performans

Energy efficiency of light sources continually increases as the technology advance. Traditional light sources have inefficiency, large sizes, short life times and poisonous mercury vapor. On the other hand, the improvements in solid state lighting like light emitting diode caused them to take place of traditional light sources because they have small sizes, high color quality, long life, high efficiency and low power consumption. Despite such benefits, LEDs' performance can still be improved. In this study, some packaging elements of white light emitting LEDs have been studied about energy gain and loss such as chip, phosphor, encapsulant, and optical elements (lenses and reflectors). Moreover, elevated temperatures in LEDs can decrease the chip's external quantum efficiency and light conversion efficiency of the phosphor. Although, remote phosphor technique can provide better thermal performance in LED systems, high power requirements have needed better application. Hence, dielectric liquid coolant integrated remote phosphor used LED package has been proposed for an experimental and computational research. Experiments, which contain the combined optical and thermal effects, have been performed with the proposed dielectric liquid cooled remote phosphor coated LED. The total light extraction enhancement has been achieved about 25-26% with the aid of liquid injection. Then, problem has been computationally simulated for optical effects. The overall optical flux performance has reached about 13% for remote phosphor used LED package with a liquid injection. Hence, the rest of the improvements about 12-13% have been induced by thermal effects.