A White Light Emitting Non-doped Rare Earth Coordination Polymer

Abstract

The application relates to a rear earth coordination polymer, and a preparation method and application thereof. A chemical formula of the compound is [Eu(H2O)(OA)0.5(DSNP)].2H2O, wherein H2DSNP is 2minute,4minute-disulfonic acid phenylimidazole(4,5-f)(1,10)phenanthroline monohydrate; OA is oxalic acid; a crystal belongs to a triclinic system; a space group is Pi; the unit cell parameters are as follows: a=9.912(8)angstrom, b=10.882(9)angstrom, c=11.977(9)angstrom, alpha=97.866(8), beta=91.933(3), gamma=115.337(14), Z=2, and the unit cell volume is V=1150.4(16)angstrom<3>. By adopting a hydrothermal method, a prepared microcrystal shows white light emittance under the ultraviolet and near of 280 to 420nm. The white light emission performance of the microcrystal sample is improved after being subjected to heat treatment; the major expression is more intensive white light emittance and is closer to the requirement of solid state lighting. The non-doped rear earth coordination polymer is potential panchromatic single fluorescent powder which can be applied to white-light LED.

Description

technical field [0001] The present application relates to single component white light emitting fluorescent materials. Background technique [0002] White light-emitting diode appeared in the late 1990s. It is a new type of solid cold light source. Compared with traditional lighting, it has the advantages of high brightness, low energy consumption, fast response, no radiation, no pollution, and shock resistance. It is called the successor The fourth generation of light sources after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps. The use of white LED lighting can save a lot of energy, build less power plants, prevent the greenhouse effect, and does not contain heavy metals such as mercury that are harmful to the environment. Therefore, various countries have listed the white light LED industry as a major national development project to support. [0003] Today, white light-emitting diodes are widely used in solid-state lighting. The main ways t...

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Problems solved by technology

In order to achieve single-component white light emission, a large number of rare earth-doped inorganic phosphors and coordination polymers have been synthesized, but there are few reports on non-doped fluorescent materials with strong white light emission.

The difficulties in realizing the white light emission of non-doped rare earth coordination polymers are: (1) It is necessary to control the fluorescence emission of organic components and rare earth ions through the principle of complementary colors or three primary colors, so that the ratio of fluorescence intensity of each component is within a reasonable range, For non-doped rare earth coordination polymers, it is generally uncontrollable; (2) the fluorescence emission of organic ligands and rare earth ions in non-doped rare earth coordination polymers often means that the inefficient ligand and Energy transfer between rare earth ions, so even with white light emission, it is difficult to achieve high fluorescence quantum efficiency

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