37results about How to "Strong fluorescence emission properties" patented technology

The invention discloses a method for preparing an ultrathin nanoribbon structure perovskite single crystal. The preparation method comprises the following steps: 1) combining AX and PbX 2 Dissolve in the precursor solvent according to the molar ratio of n:1, heat and stir to obtain the three-dimensional perovskite APbX 3 The precursor solution; 2) the three-dimensional perovskite APbX 3 Take an appropriate amount of the precursor solution and drop it on the substrate, place the substrate in a vessel containing anti-solvent, seal the mouth of the vessel; place it in an oven, let it stand for crystal growth, and obtain an ultra-thin tape Shaped perovskite single crystal; wherein: AX is selected from one or more of methylamine bromide, formamidine bromide and cesium bromide; X is a halogen anion, and n is 1-2.2. The optimal luminous wavelength of the ultra-thin perovskite single crystal obtained by the invention is 508-512nm, which realizes low-threshold laser lasing at room temperature and continuous optical pumping laser lasing at liquid nitrogen temperature.

The invention discloses a fluorescent probe for detecting hydrogen persulfide, a synthesis method and application thereof, and belongs to the technical field of chemical analysis and detection. The probe of the invention is obtained by reacting a benzothiazole phenothiazine fluorophore with green fluorescence emission with 2-fluoro-5-nitrobenzoic acid, and has the following general structural formula: the fluorophore of the probe is benzothiazole phenothiazine oxazine, the responsive group to hydrogen persulfide is 2-fluoro-5-nitrobenzoate. The probe molecule has high selectivity and sensitivity to hydrogen persulfide, and the detection range is 0–8 μmol·L ‑1 , the detection limit is 26 nmol·L ‑1 . The probe can be used for the detection of hydrogen persulfide in water, soil and cells.

The invention discloses a hydrogen-peroxide-enhanced fluorescent probe based on Rhodamine derivatives, having a chemical structural formula shown as in formula (1) which is shown the description. The hydrogen-peroxide-enhanced fluorescent probe based on Rhodamine derivatives is low in price, easy to obtain and convenient to use, is capable of specifically reacting with hydrogen peroxide to generate a Rhodamine derivative having greater fluorescence emitting capacity, is never disturbed by other related oxides during the detection of hydrogen peroxide, has good selectivity for hydrogen peroxide, and can detect hydrogen peroxide in live cells and live animals accurately.

The invention discloses a solid broadband blue-light transmitting organic luminescent material shown in a formula I and a preparation method thereof. R is H or OCH3. Two functional structural units such as the quinoxaline group and the pyridazinone group are effectively combined to form a pyridazinone-type organic luminescent molecule with quinoxaline being functionalized. The two-heterocyclic-ring pyridazinone compound provided by the invention is stable in structure and easy to store, a good ultraviolet absorption property and a strong fluorescent transmitting property in a chloroform solution can be realized, and the solid broadband blue-light transmitting organic luminescent compound is expected to become a novel organic material obtaining the white light. The preparation method is simple, the luminescent material is good in stability and can be used in the fields such as luminescent devices, white light luminescence or fluorescent probes. By adopting the solid broadband blue-light transmitting organic luminescent material and the preparation method thereof, the research and application field of the quinoxaline pyridazinone compound can be enlarged.

The invention discloses a ratio-dependent fluorescent probe for detecting hydrogen peroxide. The ratio-dependent fluorescent probe is an anthocyanin-like derivative, has the chemical structure as shown in the formula (1) and is particularly 2-(3-(7-diethylamino) coumarin)-4-(2-phenmethyl)-7-diethylamino-benzopyran perchlorate. The probe disclosed by the invention is cheap and available, convenient to use, capable of specifically reacting together with hydrogen peroxide to generate a coumarin derivative with stronger fluorescence emission capacity, free of interference from other related oxides in the process of detecting hydrogen peroxide, favorable in hydrogen peroxide selectivity and capable of accurately detecting hydrogen peroxide in living cells.

The invention relates to an s-triazine derivative, and a preparation method and application thereof. The structural formula of the derivative is as shown in the specification. The preparation method comprises the following steps: weighing p-fluorobenzaldehyde, 2-(ethylamino)ethanol, cetyl trimethyl ammonium bromide (CTAB) and K2CO3, dissolving in dimethylsulfoxide (DMSO), stirring for 15-30 hours at 80-120 DEG C, and separating to obtain a compound I; and adding 2,4,6-trimethyl s-triazine and KOH into a solvent, stirring for 30 minutes at 60-110 DEG C, dripping an ethanol solution of the compound I, continuously reacting for 15-30 hours at 60-110 DEG C, and separating to obtain the s-triazine derivative. The s-triazine derivative can be grafted on the surface of a glass sheet in a flat-lying manner to form a monomolecular film fluorescence sensor for DNT (dinitrotoluene) detection. Due to the flat-lying grafting manner, the probability of pi-pi stacking formed between fluorescent molecules can be greatly reduced, and the optical property and response sensitivity of fluorescent molecules can be improved.