Single‐Molecule White Circularly Polarized Photoluminescence and Electroluminescence from Dual‐Emission Enantiomers

Abstract

AbstractThe strategy of integrating conformational isomerization donors and chiral acceptors in a single molecule was proposed to construct white circularly polarized luminescence (WCPL) materials in this work. Consequently, a pair of dual‐emission enantiomers, namely (R/S)‐DO‐PTZ, were designed and synthesized, which displayed white emission with blue and yellow dual‐emission bands in solution and solid films with Commission Internationale de l'Eclairage (CIE) coordinates of (0.30, 0.33) and (0.33, 0.35), respectively. Meanwhile, (R/S)‐DO‐PTZ exhibited a high PLQY of up to 67 % in doped films and clear mirror‐image WCPL signals with a |glum| value of 3.0×10−3. Moreover, white circularly polarized electroluminescence (WCPEL) based on organic light‐emitting diodes (OLEDs) with (R/S)‐DO‐PTZ as emitters were also achieved with CIE coordinates of (0.32, 0.37) and EQEmax of 4.7 %, representing the state‐of‐the‐art level of white OLEDs based on single‐molecule purely organic emitters. By optimizing the device structure, warm WCPEL devices were further obtained with a |gEL| value of 2.8×10−3, CIE coordinates of (0.37, 0.48) and EQEmax of up to 15.6 %. To our knowledge, this is the first report of CP‐WOLEDs based on single‐molecule purely organic emitters.