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(Color online) (a) Scanning electron microscope image for a PC-LED device surface. The square-lattice air-hole array pattern was generated by the holographic double-exposure method. The lattice period of this specific example is . (b) Schematic view of the PC-LED, illustrating the vertical layer structure of the device.
(Color) (a) Light output vs injection current characteristics for PC-LED chips with lattice constants of 300 nm (●), 500 nm (∎), and 700 nm (▴), together with that from a planar reference device (엯) for comparison. Shown in the inset is the electroluminescence enhancement factor of the PC-LEDs relative to the reference LED. (b) characteristics for the PC-LED (∎) and the reference (엯). The inset displays emission spectra for the PC-LED (—) and the reference (---), with their peak intensities normalized for direct comparison of the spectral shapes.
(Color) Photographic images of the LEDs at a low injection current of : (a) the reference (planar) device, (b) , (c) , and (d) .
3D-FDTD simulation results. The vertical axis represents the vertical component of Poynting vectors integrated over the top surface: the thick line for the PC-LED and the thin line for the reference LED. Data are normalized such that the saturated value for the reference becomes 1.
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