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(a) Schematic diagram of the experimental setup; edge-emitting EL signals from (b) near-UV LED and (c) blue LED at .
(Color online) Optical microscope EL images of LEDs: blue LED under injection currents of (a) and (b) ; near-UV LED under injection currents of (c) and (d) . The images were .
Polarization degree of edge-emitted EL from MQW LEDs as a function of wavelength.
EL spectral shifts with increasing injection currents: (a) redshift in near-UV LED and (b) blueshift in blue LED .
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