Table 1 PL lifetime of pristine PVK and GOQDs blended PVK filmsa.

From: Origin of White Electroluminescence in Graphene Quantum Dots Embedded Host/Guest Polymer Light Emitting Diodes

Polymer films

Ï„1(f1)/ns

Ï„2(f2)/ns

Ï„avr/nsb

χ2c

Pristine PVK

4.63 (0.62)

19.71 (0.38)

10.36

1.231

GOQDs blended PVK film

4.23 (0.69)

16.73 (0.31)

8.11

2.181

  1. aThe monitored wavelength was 410 nm. The PL decay curves were fitted to a bi-exponential function to calculate the lifetime of the samples.
  2. bThe amplitude-weighted average exciton lifetime (τavr) was f1τ1 + f2τ2, where f1 and f2 are fractional intensities and τ1 and τ2 are lifetimes.
  3. cχ2 is the reduced chi-square value.
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