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. 2016 Feb 23;6:21573. doi: 10.1038/srep21573

Figure 4. PL spectra measured by the integrating sphere system.

Figure 4

Obvious improvements in light output for all the AAO-LEDs and PhC-LEDs are achieved. The maximum enhancements are obtained at the pore depth of 130 nm. Besides, a blue shift of peak wavelength is observed.