Strong Circularly Polarized Phosphorescence of Achiral Pt(II) Metallomesogen Induced by Using a Chiral Co‐Assembly Strategy

Abstract

The high planarity and heavy‐atom effect of Pt(II) metallomesogens promote their stacking in the aggregated state and highly efficient phosphorescence. This makes them promising candidate materials for circularly polarized phosphorescence (CPP) triggered by using a chiral co‐assembly strategy. In this paper, a nematic phase, achiral robot‐like Pt(II) metallomesogen (TFPt) is synthesized, which combines two anchored chiral binaphthyl inducers (R/S1 or R/S2) to construct cholesteric liquid crystal (N*‐LC) co‐assemblies (R/S1)n‐(TFPt)1‐n and (R/S2)n‐(TFPt)1‐n via intermolecular interactions. The resultant N*‐LC chiral co‐assemblies (R1)0.03‐(TFPt)0.97 and (R2)0.03‐(TFPt)0.97 exhibit the strongest CPP emission with high dissymmetry factors (gem) of up to 0.18 and 0.27, respectively, stemming from the formation of regular helical nanofibers on spin‐coated films via co‐assembly process after thermal annealing at 165 °C.

Research progress of organic circularly polarized room temperature phosphorescent materials based on cholesteric liquid crystals

“…图 3 (a) 化学结构式；(b) 手性共组装体的制备示意图和 CP-RTP 性质 [34] 。 Figure 3 (a) Chemical structures; (b) Schematic preparation of chiral co-assemblies and their CP-RTP properties [34] . [35] 。 Figure 4 Schematic diagram illustrating the emission of CP-RTP from a bilayer CP-RTP device under ultraviolet light irradiation [35] .…”

Ultrastrong Circularly Polarized Luminescence Triggered by the Synergistic Effect of Chiral Coassembly and Selective Reflective Cholesteric Liquid Crystal Film

“…The binaphthyl derivative R / S -1 was synthesized by substituting mesogenic groups at the 2,2′-positions on the binaphthyl rings to enhance compatibility with the LC system (detailed in the Supporting Information). The photophysical properties of R -1 and IrPA were evaluated by UV–vis absorption and emission spectra in THF solution at fixed concentrations of 10 –5 mol/L. The absorption peak of chiral dopants R -1 was located at 297 nm, which can be assigned to the π–π* electronic transitions from the binaphthyl moiety (Figure S1).…”