Preparation and application method of luminescent color adjustable long afterglow material based on organic salt ionic crystals

An organic salt, long afterglow technology, applied in luminescent materials, organic chemistry methods, organic chemistry and other directions, can solve the problems such as the inability to meet the application requirements of long afterglow materials, and achieve the effects of low raw material prices, huge application potential, and simple preparation methods.

Active Publication Date: 2018-05-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long afterglow materials based on organic salt ionic crystals have not been reported yet
In addition, there are still few materials that can adjust the long-lasting luminescent color by changing the stacking mode of a single chromophore molecule, which is far from meeting the application requirements of long-lasting materials.

Method used

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  • Preparation and application method of luminescent color adjustable long afterglow material based on organic salt ionic crystals
  • Preparation and application method of luminescent color adjustable long afterglow material based on organic salt ionic crystals
  • Preparation and application method of luminescent color adjustable long afterglow material based on organic salt ionic crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Synthesis process of organic long afterglow material: Weigh 0.2g of terephthalic acid, measure 0.45mL of ammonia water into a 10mL centrifuge tube, add 8mL of deionized water, and sonicate until the terephthalic acid is completely dissolved. Then the centrifuge tube is put into 50 DEG C of oil baths, water is volatilized, and the crystal of transparent monohydrogen ammonium terephthalate will be separated out at the bottom of the centrifuge tube after a few days (synthetic process is shown in figure 1 ). Ammonium monohydrogen terephthalate crystals belong to the monoclinic crystal system, C2 / c space group (see the attached figure 2 ). The unit cell size is: α=90.00°, β=97.96(3)°, γ=90.00°, The long afterglow lifetime of this material is 0.59s.

Embodiment 2

[0035] Use the same chromophore anion to change the type of cation in the organic salt, thereby changing the crystal packing mode, and then affecting the long-lasting luminous color: using the same method to synthesize dipotassium terephthalate and disodium terephthalate, All are transparent massive crystals. Dipotassium terephthalate crystals belong to the monoclinic system, P2 1 / c space group. The unit cell size is: α=90.00°, β=113.08(3)°, γ=90.00°, The long afterglow luminescence spectrum peak of the material is at 546nm, and the lifetime is 0.50s. Disodium terephthalate crystals belong to the orthorhombic crystal system, Pbc2 1 space group, the unit cell size is: α=90°, β=90°, γ=90°, The long afterglow luminescence spectrum peak of the material is at 508nm, and the lifetime is 0.42s. Phosphorescence spectra of dipotassium terephthalate and disodium terephthalate see attached image 3 .

Embodiment 3

[0037] Visual detection of ammonia and hydrogen chloride gas: according to the attached Figure 4 Put the ground TPA powder in a 5mL small beaker, then pour 20mL of ammonia water on a petri dish with a diameter of 10cm and put the small beaker into it, and finally pour the petri dish into a 1L large beaker buckle up. Take it out after standing for different time (10min, 30min, 1h). It can be found from the XRD spectrum that the phase gradually changes from terephthalic acid to diamine terephthalic acid. The afterglow color also gradually changes from yellow-green to blue-green (520-506nm). The same method is used to recover the afterglow color. After grinding the sample that has been smoked with ammonia gas, it is back fumigated with hydrogen chloride. After 7 hours, the afterglow color returns to the original yellow-green color. Figure 5 .

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Abstract

Belonging to the field of preparation and application of organic long afterglow materials, the invention in particular relates to a preparation and application method of a luminescent color adjustablelong afterglow material based on organic salt ionic crystals. The long afterglow material provided by the invention has the characteristics that: (1) the raw materials are easily available, the synthesis is simple, aqueous phase preparation method is adopted, and is environment-friendly and pollution-free; (2) different positive ions are selected, one chromophore can realize different long afterglow luminescence; and (3) ammonia and hydrogen chloride gas are respectively used for fumigating, thus realizing reversible long afterglow luminescent color adjustment, and simultaneously realizing visual detection of ammonia and hydrogen chloride gas. The organic luminescent material is expected to be a novel long afterglow material with enormous commercial potential.

Description

technical field [0001] The invention belongs to the field of preparation and application of organic long afterglow materials, and in particular relates to the preparation of a class of color-adjustable long afterglow luminescence organic salt materials, which realize reversible transformation of long afterglow luminescence and are used for visual gas detection. Background technique [0002] In recent years, organic photoelectric functional materials with long-lived excited state properties have been favored in the fields of biological imaging, solar cells, anti-counterfeiting and data encryption. This is because in the field of biological imaging, materials with long-lived excited state properties can use time-resolved technology to eliminate spontaneous background fluorescence interference in organisms and improve the signal-to-noise ratio of imaging; in the field of solar cells, they can prolong the diffusion of photogenerated excitons. The distance allows excitons to migr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/28C09K11/06G01N21/63
CPCC07B2200/13C07C63/28C09K11/06C09K2211/1007G01N21/63
Inventor 安众福黄维史慧芳程志超
Owner NANJING UNIV OF TECH
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