Method for inhibiting concentration quenching effect in Yb/Er:NaGdF4 up-conversion luminescent nanocrystals

A concentration quenching, nanocrystal technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of reduced luminous intensity, concentration quenching, etc., and achieve the effects of low cost, uniform shape and good dispersion.

Active Publication Date: 2016-10-12
CHINA JILIANG UNIV
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Problems solved by technology

High luminous efficiency is an important prerequisite for the practical application of such materials. One of the most effective ways to improve efficiency is to increase the doping concentration of active ions. However, due to the rich energy level structure of rare earth ions, increasing the doping concentration of active ions will lead to Quenching effect, which produces a large number of non-radiative relaxation and energy back transfer, which greatly reduces the luminous intensity

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  • Method for inhibiting concentration quenching effect in Yb/Er:NaGdF4 up-conversion luminescent nanocrystals
  • Method for inhibiting concentration quenching effect in Yb/Er:NaGdF4 up-conversion luminescent nanocrystals
  • Method for inhibiting concentration quenching effect in Yb/Er:NaGdF4 up-conversion luminescent nanocrystals

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Embodiment

[0022] A kind of for inhibiting Yb / Er:NaGdF 4 The method for concentration quenching effect in up-conversion luminescent nanocrystals comprises the following steps in turn: (1) with (0.5-y) millimole gadolinium acetate, 0.3 millimole magnesium acetate, y% millimole erbium acetate, 0.2 millimole ytterbium acetate , 10 milliliters of oleic acid and 16 milliliters of octadecene were added to the three-necked flask, and under the protection of nitrogen, the temperature was kept at 150°C for 1 hour to obtain anhydrous transparent solution A; After reaching room temperature, add 6 milliliters of methanol solution containing 2 mmoles of sodium hydroxide and 4 mmoles of ammonium fluoride dropwise into solution A, and then keep the temperature at 70°C for half an hour; (3) when the methanol solution is completely After volatilization, the temperature was raised to 280°C rapidly, and kept at this temperature for 90 minutes, and then naturally cooled to room temperature; (4) the obtained...

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Abstract

The invention belongs to the field of inorganic luminescent materials. A method for inhibiting a concentration quenching effect in Yb/Er:NaGdF4 up-conversion luminescent nanocrystals comprises the following steps successively: adding gadolinium acetate, erbium acetate, magnesium acetate, ytterbium acetate, oleic acid and octadecene into a three-necked bottle to obtain an anhydrous transparent solution A; after naturally cooling the solution A to 30 DEG C, adding a methanol solution of sodium hydroxide and ammonium fluoride into the solution A drop by drop; after all of the methanol solution is volatilized, rising the temperature and carrying out heat preservation, and then naturally cooling to room temperature; and washing nanocrystals with a mixed solution of ethanol and cyclohexane, and drying the washed nanocrystals to obtain a final product. The method has the advantages of being simple, low in cost and high in yield.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials, and relates to a method for controlling the structure of nanocrystals by doping with asymmetric ions, thereby suppressing the concentration quenching effect in upconversion luminescent nanocrystals, and finally realizing high-concentration activated ion doping. Background technique [0002] In recent years, rare earth ion-doped fluoride upconversion luminescent nanocrystals have shown great potential application value in the fields of solar cells, three-dimensional display, and biological imaging. High luminous efficiency is an important prerequisite for the practical application of such materials. One of the most effective ways to improve efficiency is to increase the doping concentration of active ions. However, due to the rich energy level structure of rare earth ions, increasing the doping concentration of active ions will lead to The quenching effect, that is, the generation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 雷磊徐时清
Owner CHINA JILIANG UNIV
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