Fig. 1.

Photographs of QD/LDPE films under ambient room light (A) and during illumination with a hand-held UV-lamp (B). The QDs incorporated within the films on the left have emission maxima at 617 nm (QD617/LDPE, red luminescence) and those incorporated within the films on the right have emission maxima at 546 nm (QD546/LDPE, green luminescence). The inorganic weight fraction in QD617/LDPE and QD546/LDPE was 1.30 mg mL⁻¹ and 1.08 mg mL⁻¹, respectively. Panel (C) shows normalized luminescence spectra of QD/LDPE films. The solid red and green lines correspond to QD617/LDPE and QD546/LDPE films, respectively. For comparison, the spectra of neat QD617 and QD546 in dilute toluene solution are shown as dotted lines. The excitation wavelength for these experiments was 460 nm and 550 nm for QD546 and QD617, respectively.