Highly Polarized Green Light Emitting Diode in $m$-Axis GaInN/GaN

概要

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Linearly polarized light emission is analyzed in nonpolar light-emitting diodes (LEDs) covering the blue to green spectral range. In photo luminescence, $m$-plane GaInN/GaN structures reach a polarization ratio from 0.70 at 460 nm to 0.89 at 515 nm peak wavelength. For $a$-plane structures, the polarization ratio is 0.53 at 400 nm and 0.60 at 480--510 nm. In electroluminescence the polarization ratio is 0.77 at 505 nm in $350\times 350$ μm2 $m$-plane devices at 20 mA. Such a device should allow 44% power saving compared with nonpolarized $c$-plane LEDs combined with a polarizing filter, as commonly used in LED-backlit liquid crystal displays.
2010-10-25