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Monolithic multiple colour emission from InGaN grown on patterned non-polar GaN

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Figure 1. (a) Plan-view SEM image of our non-polar GaN micro-rod arrays; (b) Plan-view SEM image of our non-polar GaN micro-rod arrays with a “mushroom” coniguration; (c–g) Plan-view SEM images of overgrown GaN on the non-polar GaN micro-rod arrays with a “mushroom” coniguration as a function of overgrowth time of 1000, 2000, 3000, 3500 and 4000 seconds, respectively, where multiple semi-polar and non-polar facets have been marked.
Figure 2. PL spectra of sample A, B and C, measured at room temperature (a,b) 10 K using a 325 nm He-Cd laser.
Figure 3. Room temperature integrated CL intensity images obtained at 5 kV of sample B calculated for the following spectral ranges: (a) 383–388 nm, (b) 405–415 nm, (c) 432–455 nm and (d) 465–500 nm. he images do not account for the 45° tilt of the sample, and thus the y-axis in each case will need to be corrected by a factor of 1.41.
Figure 4. Excitation power density dependent PL spectra of sample B measured at 10 K using a 325 nm He-Cd laser (a); and a 375 nm diode laser (b).

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