Interactive chirality transfer between chiral phosphor and achiral polyacetylene for constructing multi-color circularly polarized room temperature phosphorescence

Circularly polarized room temperature phosphorescence (CPRTP) attracts great attention, while it is still challenging for constructing CPRTP with large luminescence dissymmetry factor (g_lum). The present work establishes an interactive chirality transfer (ICT) strategy to modulate multi-color CPRTP, in which chiral phosphors work as chiral source and RTP emitter and achiral polyacetylene (PY) works as chirality transmitter. Chiral phosphors (S/R-PEA-DDT possessing blue RTP and S/R-PEA-NA possessing orange RTP, with lifetimes of 606 μs and 365 μs, respectively) without CPRTP are synthesized. As blending the phosphor with achiral PY, the chiral phosphor achieves helical chirality by ICT. In the process, chiral phosphor induces achiral PY forming chiral helical structure; furtherly, the induced helical structure subsequently induces the reverse helical arrangement of the chiral phosphor along with the helical structure. Hereto, the chiral phosphor achieves intrinsic CPRTP emission with maximum g_lum of 0.11. Benefited from the rigid helical structure of PY, the lifetimes of S/R-PEA-DDT and S/R-PEA-NA are increased by 4 % and 43 %, respectively. Furtherly, red CPRTP can be obtained via circularly polarized phosphorescence energy transfer (CPP-ET) by using the phosphors as the donor, with g_lum arriving at 10⁻². Multi-channel chiroptical integrated logic system and multi-dimension anti-counterfeiting are developed by leveraging the CPRTP of the films. The present work offers more insights into chirality transfer between the chiral-luminescent molecule and helical polymers, and establishes a universal platform for constructing CPRTP materials with large g_lum.