FIG. 1.
![(a) Typical low-resolution micro-PL spectrum of a sample (sample A, Al0.23Ga0.77N 200 nm). (b) and (c) Ultraviolet PL emission patterns of (b) sample A and (c) sample B (Al0.27Ga0.73N 100 nm) directly captured by a CCD camera through a bandpass filter (window: 330–349 nm). The excitation spot (∼20 × ∼80 µm2) is wide enough to excite all of the monitored areas at once. Note that the spectrum [panel (a)] is recorded using a spatial filter (pinhole), as described in the main text.](https://aipp.silverchair-cdn.com/aipp/content_public/journal/apm/9/12/10.1063_5.0076977/4/121106_1_f1.jpeg?Expires=1716922015&Signature=SRWFQU5bKPdEYpI7YVOl5I2LucuEzqFrNm5AuQmnA7y2NCSTnBzXqFnPvFGg~0TiWzCj9hVJ1CGum8saB9NLpBUT75NSWE58wPxy7~UR4Rs2IFJFEclRvwr2jVYRnc0nstZ6-8s72oymzPwyPqUKpe0bYh2UtDFwyuO-~jfSO2-YLJFzBsbSVNOFiLCtmdvTSeYQoDt7yqIG1JRp1ZB1dq6gJvVIjl9tbK3EurUuq~LJPQ74NHa9lPcmtutWFE99G6y1EwhtU8Z67UkgL95AZ2CI2MR9N7z2CP3UpUvETmWep08MPrq~OQIP3~Gt9WpFc458G~ghx7A3rOtsIPIrEQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
(a) Typical low-resolution micro-PL spectrum of a sample (sample A, Al0.23Ga0.77N 200 nm). (b) and (c) Ultraviolet PL emission patterns of (b) sample A and (c) sample B (Al0.27Ga0.73N 100 nm) directly captured by a CCD camera through a bandpass filter (window: 330–349 nm). The excitation spot (∼20 × ∼80 µm2) is wide enough to excite all of the monitored areas at once. Note that the spectrum [panel (a)] is recorded using a spatial filter (pinhole), as described in the main text.
