Figure 4

Fundamental device performance and additive spectral mixing of the monolithic multi-wavelength LED. (a) Current–voltage characteristics of InGaN LEDs formed on Top, Slope A, and Slope B. (b) Normalized EL spectra of the three LEDs individually driven at an injection current density of 200 A/cm\(^2\). (c) EL spectra under simultaneous operations of two or all three of the LEDs. Injection currents are 5 mA at Top, 0.45 mA at Slope A, and 0.39 mA at Slope B. Peak EL intensities from the three parts are almost the same under this condition. Optical microscope images of (d) the individual operations in (b), and (e) the simultaneous operations in (c). Topmost image in (d) is the sample not operated to clearly indicate the measurement locations.