Effect of injection current on the optical polarization of AlGaN-based ultraviolet light-emitting diodes

Effect of injection current on the optical polarization of AlGaN-based ultraviolet light-emitting diodes

The injection current dependence of optical polarization of ultraviolet (UV) light-emitting diodes (LEDs) emitting at wavelength of 310 nm and 277 nm was investigated by electroluminescence (EL) measurements. For both diodes, it was found that the degree of polarization (DOP) decreased obviously as...

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Veröffentlicht in:Optics express 2014-08, Vol.22 (16), p.19589-19594
Hauptverfasser: Hou, Mengjun, Qin, Zhixin, He, Chenguang, Cai, Jun'an, Wang, Xinqiang, Shen, Bo
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container_end_page 19594
container_issue 16
container_start_page 19589
container_title Optics express
container_volume 22
creator Hou, Mengjun
Qin, Zhixin
He, Chenguang
Cai, Jun'an
Wang, Xinqiang
Shen, Bo
description The injection current dependence of optical polarization of ultraviolet (UV) light-emitting diodes (LEDs) emitting at wavelength of 310 nm and 277 nm was investigated by electroluminescence (EL) measurements. For both diodes, it was found that the degree of polarization (DOP) decreased obviously as the injection current increased. We attribute the decrease in DOP to the different changing trend of the intensity of the light emission from transverse electric (TE) polarization (E⊥c) and transverse magnetic (TM) polarization (E∥c) as the injected carriers occupy higher states above k = 0 with increasing the injection current. For the 277 nm LED, even the polarization switching from TE to TM mode was observed.
doi_str_mv 10.1364/OE.22.019589
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title Effect of injection current on the optical polarization of AlGaN-based ultraviolet light-emitting diodes
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