Enhancement of Yellow Light Extraction Efficiency of Y ₃Al ₅O ₁₂:Ce ^3+ Ceramic Converters Using a 2-D TiO ₂ Hexagonal-Lattice Nanocylinder Photonic Crystal Layer

Abstract

The effects of 2-D hexagonal-lattice TiO2 photonic crystal layers on the directional light extraction efficiency of low-scattering (Y1-xCex)3Al5O12 (YAG:Ce 3+) ceramic converters have been investigated. The hexagonal-lattice TiO2 patterns were fabricated by an electron beam lithography process. The optimized yellow directional light extraction enhancement by a factor of 4.4 is achieved with a 2-D photonic crystal layer having a diameter of 430 nm, a lattice constant of 590 nm, and a height of 350 nm. A 3-D finite-difference time-domain model has also been developed to study the geometric parameters of the photonic crystal layer, yielding results that are consistent with our measured data.

Keywords

• Photonic Crystals
• Light extraction efficiency
• YAG:Ce3+
• LED