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(a) Band diagram of a II–VI color converter. (b) Band gap energies and lattice constants of the CdMgZnSe alloys used in the color converters. The points marked green, yellow, and red indicate the emission peaks and estimated lattice constants of the quantum wells. The spectrum of the blue LED used for photopumping is superimposed.
Diagram of the blue LED and a II–VI color converter with inset showing details of the converter.
Measured spectra of the blue LED, compared to that of three II–VI color converters when each was placed on top of the LED. The current through the LED was for all four spectra.
Measured light output (in milliwatt) for the blue LED as a function of dc current, compared to that of each of the II–VI color converters when placed on the LED. The operating voltage of the LED is also shown.
External quantum efficiency for the blue LED (photons per electron) and the external quantum conversion efficiency of three color converters (emitted photons per incident blue photon).
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