Abstract
White light-emitting diodes (LEDs) are attractive as a solid-state lighting device. Especially, phosphor materials are fundamental component for white-light generation. For the generation of white LEDs, the InGaN blue LED chips and the yellow light from cerium-activated yttrium aluminum garnet phosphor (Y3Al5O12:Ce3+) have been used. These white LEDs usually have a highly correlated color temperature >5000 K and a low color-rendering index (CRI) value, which produces a cold white light. An alternative is to blend red, green, and blue (RGB) phosphors on a near-UV chips emitting chip. These oxide phosphors play a very important role. At a present time, remote phosphors are used as key materials on InGaN blue LED chips for solving the thermal problem. As the remote phosphors are applied to LEDs, the system efficiency could be increased ≤30 %. In this section, we will discuss the oxide phosphor including the new remote phosphor for the generation of white light-emitting diodes LEDs.
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