Fig. 1: The composition and basic properties of upconverted stretchable photonic crystal (SPC) films. | Nature Communications

Fig. 1: The composition and basic properties of upconverted stretchable photonic crystal (SPC) films.

From: Mechanically steered photon upconversion and circularly polarized luminescence in stretchable photonic crystal films

Fig. 1: The composition and basic properties of upconverted stretchable photonic crystal (SPC) films.

a Chemical structures of diacrylate mesogen (RM257), chiral dopants (R-/S-5011), cross-linker (PETMP), chain extender (EDDET), and the sensitizer (PtTPBP)/acceptor (BPEA) pair for fabricating upconverted SPC film. b Schematic diagram of the Triplet-triplet annihilation photon upconversion (TTA-UC) process including triplet-triplet energy transfer (TTET) from sensitizer to receptor and triplet-triplet annihilation (TTA) between two triplet acceptors for upconverted circularly polarized luminescence (UC-CPL) in the helical structure of the microscopic cross-linked network of upconverted SPC film. (λex = 639 nm, λem = 515 nm) c Schematic illustration of reversable mechanically-steered photonic band gap (PBG), upconverted photoluminescence (UCPL), and UC-CPL.

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