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Schematic diagrams of (a) 458 nm blue and (b) 333 nm UV LED structures.
Schematic diagram of the experimental setup to measure the angle and polarization resolved EL spectra of LEDs. The rotational stage has an translator stage holding LEDs and can be rotated about the axis. Light emitted along the axis passing through a pinhole and cube polarizer is ultimately detected by a spectrometer. The polarizer cube was mounted on 360° rotational stage which selects either the or the component.
and components of EL spectra of (a) blue LED and (b) UV LED at . Both LEDs were driven with a 20 mA forward current.
Angular dependence of the peak EL intensities of and components of (a) blue LED and (b) UV LED emissions. (c) The degree of polarization of blue and UV LEDs.
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