Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters.


PPSM , ENS Cachan , CNRS , Université Paris Saclay , 94235 Cachan , France . Email: [Email] ; Email: [Email]


Two difluoro-boron β-diketonate complexes bearing chiral amido groups have been synthesized. Their mechano-responsive luminescence and chiroptical properties have been investigated in the solid state. Both compounds display a bright blue-green emission and a significant circularly polarized luminescence (CPL) signal in the crystalline state, with |glum| values as high as 2.2-2.4 × 10-2. A bathochromic shift in emission, together with a decrease of |glum| values to c.a. 3 × 10-3, is induced upon application of a shearing stress. For the DFB-Hex-amide compound, interestingly, sign inversion of the anisotropy factor glum is observed under mechanical stimulation ("mechano-CPL effect"), which can be rationalized by a switching between monomer and excimer emission.