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Polarized LED raises hope of more efficient displays

The Smart Lighting Engineering Research Center (ERC) at Rensselaer Polytechnic Institute (RPI) in Troy, NY and Kyma Technologies Inc have used non-standard crystal growth directions to create a nitride semiconductor light-emitting diode with a polarization intensity ratio of 0.77. The researchers comment that this polarization intensity ratio is, to their knowledge, “the highest value obtained in top surface emission of any AlGaInN LED for wavelengths longer than 500nm from planar surface emission”. Polarized LEDs could be used to make more efficient back-lighting units for liquid-crystal displays (LCDs).

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