Fig. 4: Performance of the tandem white LED. | Nature Communications

Fig. 4: Performance of the tandem white LED.

From: Quantum-dot and organic hybrid tandem light-emitting diodes with multi-functionality of full-color-tunability and white-light-emission

Fig. 4

a The J–V–L, b EQE–J characteristics of the B-OLED, Y-QLED, and tandem white LED. c The photos of an operating tandem white LED driven by different voltage levels. d Normalized emission spectra of the tandem white LED under d DC driving, and e, f AC driving. g CIE coordinates of the white LED (star), B-OLED (blue point), and Y-QLED (red point). Under AC driving, stable white emission with CIE coordinates fixed at (0.34, 0.36) can be obtained for a wide range of brightness (1000–50,000 cd m−2). Also, the color temperature can be tuned from 1500 to 10,000 K, which well traces the blackbody locus. h AC signals and i DR–L and VB–L curves for driving a color stable white LED.

Back to article page