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(Color online) QW width and oscillator strength for LEDs emitting at and , respectively. For a longer emission wavelength, smaller QWs but higher In content are required for sufficient oscillator strength.
(Color online) Temperature dependent IQE at different excitaion power levels for a SQW emitting at . The curve as fitted using an Arrhenius model. Inset: Room-temperature PL spectra measured from edge to avoid Fabry–Perot interferences.
(Color online) Room-temperature IQE vs emission wavelength. Samples with thinner QWs show higher values of IQE for the whole blue to green spectral region.
(Color online) Current dependence of the EQE for blue and green LED structures. For green LEDs, the EQE is still lower compared to the blue LED, but there is no significant drop in EQE toward higher drive currents.
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