Remarkable White Circularly Polarized Electroluminescence Based on Chiral Co‐assembled Helix Nanofiber Emitters
Yu Zhang, Yupeng Li, Yiwu Quan, Shanghui Ye, Yixiang Cheng
Abstract
Abstract White circularly polarized organic light‐emitting diodes (CP‐WOLEDs) are of great significance in potential lighting sources and full‐color 3D displays. However, High‐performance white CP‐EL sources are almost unexplored. We have constructed full‐color CP‐EL devices based on chiral co‐assemblies by using three achiral conjugated pyrene‐based dyes (BP, w ‐WP and c ‐WP) doped with chiral binaphthyl‐based enantiomers ( S ‐/ R ‐M) as the EMLs through an intermolecular chirality induction mechanism. ( S ‐/ R ‐M) 0.2 ‐( c ‐WP) 0.8 films exhibit regular helix nanofibers under annealing treatment and emit strong white CPL. Significantly, remarkable CP‐WOLEDs based on ( S ‐/ R ‐M) 0.2 ‐( c ‐WP) 0.8 were achieved with | g EL | values as high as 6.2×10 −2 and an excellent CRI of 98 at the CIE coordinates of (0.33, 0.33). These are the highest g EL and CRI values of reported CP‐WOLEDs to date. This is the first achievement of CP‐WOLEDs based on chiral co‐assembled helix nanofiber emitters, and provides a valuable strategy with which to develop white CP‐EL for future practical applications.