Fig. 4: Emission characteristics of dually doped NaGd0.6F4:Tb0.4−xEux@CzPPOA nanocrystals.
From: Electro-generated excitons for tunable lanthanide electroluminescence
a, PL spectra of NaGd0.6F4:Tb0.4−xEux@CzPPOA nanocrystals (x = 0, 0.01, 0.05, 0.08 and 1.0) dispersed in ethanol, with corresponding emission photographs shown in the inset. b, EL spectra of the NaGd0.6F4:Tb0.4−xEux@CzPPOA (x = 0, 0.01, 0.05, 0.08 and 0.10) based device. c, Variations of CIE1931 chromaticity coordinates for both thin films and devices, highlighting the colour progression from green to yellow and red with increasing Eu3+ content. Inset, corresponding emission photographs of the devices. d,e, Current density (J, open symbols)–voltage–luminance (solid symbols) curves (d) and EQE versus luminance curves (e) of NaGd0.6F4:Tb0.4−xEux@CzPPOA-based devices.
