Abstract
This paper compares the optical effects of a two-dimensional (2D) SiO<sub>2</sub> and SiN<sub>x</sub> photonic crystal layer (PCL) on Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> (YAG:Ce) yellow ceramic plate phosphor (CPP) to achieve enhanced extraction efficiency of YAG:Ce CPP on top of a blue InGaN light-emitting diode (LED) cup. The low external efficiency of YAG:Ce CPP is due to low light extraction efficiency by the total internal reflection (TIR) and waveguide effect occurring in film-type phosphor. To reduce the TIR and the waveguide effect on YAG:Ce CPP, 2D triangular-lattice air-hole nanoarrays of SiO<sub>2</sub> and SiN<sub>x</sub> with various lattice constant (330, 420, 580, and 720nm) as PCL were fabricated on the YAG:Ce CPP by nanosphere lithography (NSL). The optimum properties on light extraction efficiency of YAG:Ce CPP are realized by adding the 2D SiN<sub>x</sub> PCL with a 580nm lattice constant. By adding the 2D SiN<sub>x</sub> PCL with a 580 nm lattice constant, integrated yellow emission was improved by a factor of 1.72 compared to that of a conventional YAG:Ce CPP capped on a blue LED cup.
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