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High current-induced degradation of AlGaN ultraviolet light emitting diodes
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10.1063/1.3590149
/content/aip/journal/jap/109/10/10.1063/1.3590149
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/10/10.1063/1.3590149

Figures

Image of FIG. 1.
FIG. 1.

(Color online) QW PL transients for the virgin and aged 285 nm (a) and 310 nm (b) LEDs. The insets show PL spectra of the virgin devices.

Image of FIG. 2.
FIG. 2.

(Color online) PL spectra (a) and transients (b) of the 285 nm LED for different excitation wavelengths.

Image of FIG. 3.
FIG. 3.

(Color online) PL spectra of the 310 nm device for different excitation wavelengths.

Image of FIG. 4.
FIG. 4.

(Color online) Bandedge PL transients of the p-cladding in the virgin and aged 285 nm (a) and 310 nm (b) devices.

Image of FIG. 5.
FIG. 5.

EL spectra of the 285 nm (a) and 310 nm (b) virgin LEDs at different driving currents.

Image of FIG. 6.
FIG. 6.

Low current EL spectra of the 285 nm (a) and 310 nm (b) LEDs after different periods of aging. The insets show EL intensity dependence on the aging time.

Image of FIG. 7.
FIG. 7.

(Color online) Comparison of the EL and PL spectra for the 285 nm LED at comparable carrier densities before and after aging. PL excitation was in QWs (a) and (b) and above (c) the QWs.

Image of FIG. 8.
FIG. 8.

(Color online) Comparison of the EL and PL spectra for the 310 nm LED at comparable carrier densities before and after aging. PL excitation was in QWs (a) and (b) and above (c) the QWs.

Image of FIG. 9.
FIG. 9.

Peak wavelength shift as a function of the driving current for the virgin 285 nm (a) and 310 nm (b) LEDs. The insets show the wavelength shifts at a 100 mA current that occur with aging.

Image of FIG. 10.
FIG. 10.

(Color online) I-V characteristics for the 285 nm (a) and 310 nm (b) LEDs. The dots represent experimental data, the lines are the result of the fit to the model Eq. (1). Linear parts of the I-V dependence below the turn-on voltage are shown in part (c). Part (d) depicts parts of the I-V curves of the 285 nm LED over the turn-on voltage for the different periods of aging.

Image of FIG. 11.
FIG. 11.

(Color online) Microphotographs of the emission from the 285 nm (left column) and 310 nm (right column) virgin LEDs (top row), after aging (middle row) and with reverse bias EL superimposed on the forward bias emission of the aged devices (bottom row).

Image of FIG. 12.
FIG. 12.

(Color online) Forward and reverse bias emission spectra of the aged 285 nm LED.

Tables

Generic image for table
Table I.

I-V curve fit parameters for different periods of aging.

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/content/aip/journal/jap/109/10/10.1063/1.3590149
2011-05-17
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High current-induced degradation of AlGaN ultraviolet light emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/10/10.1063/1.3590149
10.1063/1.3590149
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