In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 11, No. 14 ( 2023), p. 4846-4854
Abstract:
In this work, we report a novel double N,S-hetero[5]helicene composed of two benzo[ b ]phenothiazines (2) that exhibits long-lived circularly polarized room-temperature phosphorescence (RTP). Compared with the previously reported N , O -analogue composed of two benzo[ b ]phenoxazines (1), 2 emitted more intense phosphorescence with a longer lifetime than 1 in a frozen solution at near liquid nitrogen temperature and even at room temperature when doped in a β-estradiol matrix. The intense and long-lived phosphorescence of 2 was fully explained by theoretical calculations. The optical resolution of 2 was successfully achieved, and the chiroptical properties of 2 were investigated. We found that 2 doped in a matrix exhibits strong dual circularly polarized luminescence originating from fluorescence (| g CPL | = 1.7 × 10 −2 ) and long-lived phosphorescence (| g CPL | = 5 × 10 −3 , lifetime of 0.16 s, and Φ p of 30%) at room temperature. 2 is a very rare example of a purely-organic helicene that exhibits long-lived circularly polarized RTP from a non-aggregated state.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702245-6
