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(a) The room-temperature PL spectrums of the sample measured under different pumping power densities 0.38, 0.59, and . The peak at is resulted from the excitation laser (632.8 nm). (b) The PL peak energies obtained under different excitation powers and the fitting curve of the peaks with the third root of the excitation densities.
(a) The I-V characteristics and (b) the room-temperature EL spectrums of the device. The applied voltages for the EL spectrums are 1.0, 1.5, and 2.0 V, respectively. The insert figure in (b) shows the EL peak energies of the device under different injection current densities.
The EL peak energies of the device under different injection current densities and the fitting curve following the same function with minor modifications for PL peaks.
Schematic band diagram of the device with forward applied voltages larger than the turn-on voltage 0.8 V.
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