Polarized white light-emitting diode without phosphor conversion (Semi-Conductor Today)

October 1, 2015

University of California, Santa Barbara (UCSB) researchers have developed polarized white light-emitting diodes (LEDs) that do not use phosphors [S. J. Kowsz et al, Appl. Phys. Lett., vol107, p101104, 2015].

Such devices could lead to less power consumption in liquid-crystal displays (LCDs), which depend on polarized light for their operation. Presently, unpolarized light from white LED back-lighting is put through a polarizing sheet to give the polarized light for phase shifting by the liquid crystal. The polarization cuts the light power by at least half. Even if the light was only partially polarized, the loss from transmission through a polarizer could be reduced.

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