The current density-voltage and photon count intensity-voltage characteristics of the devices were measured by using a Keithley 2400 (Keithley instruments Inc.) and FLS920 (Edinburgh Instrument). The absorption spectra was measured in the wavelength range of 300–900 nm with a UV-vis spectrophotometer (U-3310 UV-vis HITACHI). The decay kinetics was measured by FLS920. All measurements were done at room temperature under ambient air.
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