TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The waveguide comprises a rigid substrate or a flexible substrate. The fluorescent column: comprises various fluorescent materials, a cylinder, a hollow cylinder, a rectangular cylinder, a hollow rectangular cylinder and/or a polygon; has a width of 10-100 mu m (preferably larger than 100 mu m); and forms a specific shape in the waveguide. The specific shape includes a palisade shape, a web shape, a pattern, a letter and/or a symbol. The first wavelength is 300-1000 nm and the second wavelength is 700-1000 nm. The fluorescent columns are connected by a continuous film. The off-grid lamp further comprises a switch electrically connected to the electricity storage device. Preferred Method: The method further comprises forming at least one second cylinder trench at a surface of the second waveguide, and filling a second fluorescent material into the second cylinder trench to form a second fluorescent column, before the step of assembling the first waveguide and the second waveguide, and attaching the first fluorescent column and the second fluorescent column to each other, after assembling the first waveguide and the second waveguide. The first cylinder trench is formed by stamping, etching and/or laser printing. The cylinder hole is formed by laser drilling and/or ion beam drilling. The cylinder hole passes through the waveguide or does not pass through the waveguide.    TECHNOLOGY FOCUS - POLYMERS - Preparation: No preparation method is given. Preferred Composition: The dye-labeled polymer has an absorption wavelength of 200-400 nm, a photo luminescence wavelength of 350-1100 nm and a solubility parameter is 8-25 MPa1/2. Preferred Components: The polymer moiety comprises moieties of poly(e-caprolactone), polyethylene, polyvinyl alcohol and/or polystyrene. The fluorescent dye moiety comprises 1,2-coumarin moiety, perylene moiety, naphthalene moiety, pyrene moiety, polymethine moiety, carbazole moiety and/or anthracene moiety. A mole ratio of the polymer moiety to the fluorescent dye moiety is 1:20-1:1000. The polymer material comprises polyethylene vinyl acetate, polymethacrylate, polycarbonate resin, polyvinyl butyral and/or epoxy resin. A difference between a solubility parameter of the polymer material and the solubility parameter of the dye-labeled polymer is plus minus 15 MPa1/2. EXAMPLE - Ring-opening polymerization was performed by reacting caprolactone monomer (50 moles) and 9-(hydroxymethyl)anthracene (1 mole) containing hydroxyl group with stannous 2-ethylhexanoate (0.1 g) as a catalyst at 130 degrees C. The reaction was continued for 8 hours to obtain dye-labeled polymer of formula (I).    m = 50.