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Efficiency droop behaviors of multiple-quantum-well light-emitting diodes with varying quantum well thickness
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10.1063/1.2805197
/content/aip/journal/apl/91/18/10.1063/1.2805197
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/18/10.1063/1.2805197
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic structure multiple-quantum-well LEDs with varied well thicknesses.

Image of FIG. 2.
FIG. 2.

(Color online) Temperature-varied (from ) photoluminescence measurements for room-temperature IQE assessment of MQW LEDs with varied well thicknesses.

Image of FIG. 3.
FIG. 3.

(Color online) Room-temperature EL spectra of MQW LEDs with varied well thicknesses under various injection currents. The peaks of the emission spectra shift toward shorter wavelengths (blueshift) as the current is increased from , as indicated by the two vertical lines.

Image of FIG. 4.
FIG. 4.

(Color online) Normalized external quantum efficiency measurements of the MQW LEDs with varied well thicknesses. Measurements are pulsed with 5% duty cycle. For samples with different well thicknesses, the efficiency drop from the highest value at low current density to is 2.7%, 17.9%, 36.7%, and 40.4%, respectively. This figure clearly illustrates a reduced efficiency-droop effect for thicker quantum wells.

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/content/aip/journal/apl/91/18/10.1063/1.2805197
2007-10-31
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficiency droop behaviors of InGaN∕GaN multiple-quantum-well light-emitting diodes with varying quantum well thickness
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/18/10.1063/1.2805197
10.1063/1.2805197
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