Single-component white polymer light-emitting diode (WPLED) based on a binary tris-pyrazolonate-Sm-complex

Based on the doping of the binary tris-pyrazolate-Sm3+ complex [Sm(tba-PMP)3(5-Br-2,2′-bpy)] (1; 5-Br-2,2′-bpy = 5-bromo-2,2′-bipyridine and Htba-PMP = 1-phenyl-3-methyl-4-(tert-butylacetyl)-5-pyrazolone)) with an efficient orange-light into the PVK (poly(N-vinylcarbazole) host, the obtained PVK@1 films exhibit the dichromatic color-tuning (white-light to purplish-pink and to pink) characters strictly relative to the Sm3+-doping content and the λex wavelength. Further using the PVK@1 film (10:1; wt/wt) with the straightforward white-light (ΦPL = 5.8%) as the emitting layer, its single-component solution-processed WPLED gives the electroluminescent performance (LMax of 157 cd/m2, ηcMax of 0.65 cd/A and the white-light-emitting stability) satisfactory enough for portable full-color flat displays. [Display omitted] •Complex [Sm(tba-PMP)3(5-Br-2,2′-bpy)] (1) with efficient Sm3+-centered orange-light is obtained.•The PVK@1 film shows the dichromatic color-tuning white-light.•The single-component WPLED based on the PVK@1 film is developed.