Blue-green and white color tuning of monolithic light emitting diodes
Résumé
A blue light emitting diode (LED) is grown on top of a (Ga, In)N/GaN multiple quantum well acting as a light converter from blue to green-yellow wavelength. The blue light is produced by electrical injection, while the green-yellow emitting QWs are optically pumped by the blue photons. It is shown that the final color of the LED is strongly dependent on the blue pumping wavelength, the absorption and the internal quantum efficiency of the light converter. Depending on these parameters blue to green LEDs or even white LEDs can be obtained. In addition the current dependence between 10 to 100 mA of the LED electroluminescence is measured and analyzed. The reduced blue-shift as a function of the current indicates that the carrier density per quantum well in the light converter stays relatively small compared to classical current injected green LEDs.
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