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. 2019 Aug 21;4(9):2301–2307. doi: 10.1021/acsenergylett.9b01446

Figure 1.

Figure 1

(a) PLQE with laser intensity when illuminated by a 648-nm continuous wave laser for x = 0 and 5% films. The dashed vertical line corresponds to 1 sun equivalent excitation density. The inset shows typical PL spectra. (b) Normalized PL decays for the same films, when illuminated by a 635-nm pulsed laser with intensity of 50 nJ cm–2. PL decays of x = 0 and 5% films are shown in (c) and (d), respectively, recorded when samples are encapsulated (as in b), following 1 min of air exposure and after 45 min of air exposure.