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Spectral shape and broadening of emission from AlGaInP light-emitting diodes
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10.1063/1.3243319
/content/aip/journal/jap/106/7/10.1063/1.3243319
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/7/10.1063/1.3243319

Figures

Image of FIG. 1.
FIG. 1.

Power spectra of (a) yellow-green and (b) amber LEDs measured at 10 mA. From bottom to top, ambient temperatures are from 400 to 120 K in steps of 20 K.

Image of FIG. 2.
FIG. 2.

Peak positions and peak intensities for yellow-green (circles) and amber (squares) devices, obtained from Fig. 1.

Image of FIG. 3.
FIG. 3.

Photon density spectra of (a) yellow-green and (b) amber LEDs measured at 10 mA on a semi-log scale. From bottom to top, the ambient temperatures are from 400 to 120 K in steps of 20 K. The high-energy tails are accurately fitted by dashed straight lines with gradients .

Image of FIG. 4.
FIG. 4.

(a) Theoretical spontaneous emission spectra of (a) bulk material and of (b) quantum well. The dashed lines represent optical joint density of states and high-energy attenuation functions.

Image of FIG. 5.
FIG. 5.

FWHM of photon density spectra in Fig. 3. The solid and dashed lines represent corresponding linear regressions.

Image of FIG. 6.
FIG. 6.

Dependences of junction temperatures on ambient temperatures obtained from gradients of high-energy tails in Fig. 3.

Image of FIG. 7.
FIG. 7.

(a) Points plot spectrum of yellow-green sample measured at 300 K while solid curve plots simulated results. The inset plots the relationship between and obtained from measured spectrum. (b) Points plot effective band gap probability distribution function obtained by differentiating the curve in inset in (a). These points are very close to a Gaussian distribution, plotted as a solid curve.

Image of FIG. 8.
FIG. 8.

Solid curves plot effective band gap probability distribution functions obtained from Fig. 3, and dashed curves show corresponding Gaussian simulations.

Image of FIG. 9.
FIG. 9.

(a) Peak positions and (b) FWHM of effective band gap probability distribution functions in Fig. 8. The solid and dashed lines are corresponding linear regressions.

Image of FIG. 10.
FIG. 10.

Measured (solid curves) and simulated (dashed curves) photon density spectra. From bottom to top, ambient temperatures are from 120 to 400 K in steps of 20 K.

Image of FIG. 11.
FIG. 11.

Dependence of on and . From left to right, is from 10 to 150 meV in steps of 10 meV.

Image of FIG. 12.
FIG. 12.

Effects of reabsorption on measured carrier temperature and peak intensity.

Tables

Generic image for table
Table I.

Linear regression of FWHMs of photon density spectra in Fig. 3, and of effective band gap probability distribution functions in Fig. 8. The units are meV.

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/content/aip/journal/jap/106/7/10.1063/1.3243319
2009-10-14
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectral shape and broadening of emission from AlGaInP light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/7/10.1063/1.3243319
10.1063/1.3243319
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