6 February 2012 Effects of 2D SiO2 and SiNx photonic crystal on extracted light from Y3Al5O12:Ce3+ ceramic plate phosphor
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Abstract
This paper compares the optical effects of a two-dimensional (2D) SiO2 and SiNx photonic crystal layer (PCL) on Y3Al5O12:Ce3+ (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 SiO2 and SiNx 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 SiNx PCL with a 580nm lattice constant. By adding the 2D SiNx 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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Hoo Keun Park, Hoo Keun Park, Jeong Rok Oh, Jeong Rok Oh, Young Rag Do, Young Rag Do, } "Effects of 2D SiO2 and SiNx photonic crystal on extracted light from Y3Al5O12:Ce3+ ceramic plate phosphor", Proc. SPIE 8278, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI, 82781J (6 February 2012); doi: 10.1117/12.908204; https://doi.org/10.1117/12.908204
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