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