Photoprogrammable circularly polarized phosphorescence switching of chiral helical polyacetylene thin films

Abstract

The developments of pure organic room-temperature phosphorescence (RTP) materials with circularly polarized luminescence (CPL) have significantly facilitated the future integration and systemization of luminescent material in fundamental science and technological applications. Here, a type of photoinduced circularly polarized RTP materials are constructed by homogeneously dispersing phosphorescent chiral helical substituted polyacetylenes into a processable poly(methyl methacrylate) (PMMA) matrix. These substituted polyacetylenes play vital roles in the propagation of CPL and present prominently optical characteristics with high absorption and luminescent dissymmetric factors up to 0.029 (gabs) and 0.019 (glum). The oxygen consumption properties of the films under UV light irradiation endow materials with dynamic chiro-optical functionality, which can leverage of light to precisely control and manipulate the circularly polarized RTP properties with the remarkable advantages of being contactless, wireless and fatigue-resistant. Significantly, the distinct materials with dynamic properties can be used as anti-counterfeiting materials involving photoprogrammability.

Recent progress with the application of organic room-temperature phosphorescent materials

“…anti-counterfeiting application with photoprogrammability. 56 The chiral polymer was constructed by copolymerizing chiral 4-isobutylphenyl-N-propanamide derivative (phNA) and the RTP chromophore 4-bromo-1,8naphthalimide derivative (BrNpA) and the rigid matrix PMMA was used to enhance RTP emission. The p(phNA 7 BrNpA 3 )-PMMA film exhibited time-dependent tunable RTP intensity because of the consumption of oxygen in the PMMA matrix under continuous UV irradiation.…”

Time-dependent photo-activated aminoborane room-temperature phosphorescence materials with unprecedented properties: simple, versatile, multicolor-tuneable, water resistance, optical information writing/erasing, and multilevel data encryption

“…In such a rigid environment, the nonradiative transition and quenching of triplet excitons can be suppressed effectively, resulting in the release of highly efficient phosphorescence. 8 …”

Construction of a Chiral Fluorescent Probe for Tryptophan Enantiomers/Ascorbic Acid Identification

“…Chirality is ubiquitous in nature. The study of chirality is of great significance for food science, biomedicine, and life science, − and combining circularly polarized luminescence with organic room-temperature phosphorescence is available for encryption. − Enantiomers are pairs of non-superimposable mirror images of one another as one’s left and right hands are “the same” but opposite. All the physical properties of enantiomers should be identical except for the optical rotations, which are of opposite signs.…”