Green light excited red phosphor and preparation method thereof

A technology of red phosphor and green light, which is applied in the field of red phosphor and its preparation, can solve the problems of unfavorable large-scale use, low luminous efficiency of ultraviolet chips, and high price of ultraviolet chips, and achieve good chromaticity saturation and color temperature stability Good, simple preparation method

Pending Publication Date: 2019-02-22
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of LED lights excited by ultraviolet light are: first, the luminous efficiency of ultraviolet chips is relatively low; second, the price of ultraviolet chips is still very expensive, which is not conducive to mass use; third, the light of ultraviolet chips must pass through phosphor Energy absorption to remove ultraviolet light to prevent ultraviolet light from harming people, especially the eyes

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  • Green light excited red phosphor and preparation method thereof
  • Green light excited red phosphor and preparation method thereof
  • Green light excited red phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A green-light-excited red phosphor Ca 0.75 MoO 4 :0.25Eu 3+ :0.04Si: The preparation method of 0.25Li comprises the following steps:

[0041] (1) First prepare the raw materials, find out the corresponding relative molecular mass, molecular formula, and match the equation, and calculate the corresponding molar masses of calcium carbonate, europium oxide, ammonium molybdate tetrahydrate, ethyl orthosilicate and Li;

[0042] (2) Record the calculated data with an excel form to facilitate the experiment. Use an electronic balance to weigh the raw materials, and the weighing value will retain three decimal places. Calcium carbonate, europium oxide and Li are dissolved with nitric acid respectively to obtain calcium nitrate solution, europium nitrate solution and lithium nitrate solution; tetrahydrate ammonium molybdate and citric acid are dissolved in water to obtain a concentration of citric acid solution of 0.5g / mL and a concentration of 0.1g / mL ammonium molybdate solut...

Embodiment 2

[0050] A green-light-excited red phosphor Ca 0.8 MoO 4 :0.2Eu 3+ :0.6Si: The preparation method of 0.2Li comprises the following steps:

[0051] (1) First prepare the raw materials, find out the corresponding relative molecular mass, molecular formula, and match the equation, and calculate the corresponding molar masses of calcium carbonate, europium oxide, ammonium molybdate tetrahydrate, ethyl orthosilicate and Li;

[0052] (2) Record the calculated data with an excel form to facilitate the experiment. Use an electronic balance to weigh the raw materials, and the weighing value will retain three decimal places. Calcium carbonate, europium oxide and Li are dissolved with nitric acid respectively to obtain calcium nitrate solution, europium nitrate solution and lithium nitrate solution; tetrahydrate ammonium molybdate and citric acid are dissolved in water to obtain a concentration of citric acid solution of 0.4g / mL and a concentration of 0.08g / mL ammonium molybdate solution...

Embodiment 3

[0058] A green-light-excited red phosphor Ca 0.7 MoO 4 :0.3Eu 3+ :0.05Si: The preparation method of 0.4Li comprises the following steps:

[0059] (1) First prepare the raw materials, find out the corresponding relative molecular mass, molecular formula, and match the equation, and calculate the corresponding molar masses of calcium carbonate, europium oxide, ammonium molybdate tetrahydrate, ethyl orthosilicate and Li;

[0060] (2) Record the calculated data with an excel form to facilitate the experiment. Use an electronic balance to weigh the raw materials, and the weighing value will retain three decimal places. Calcium carbonate, europium oxide and Li are dissolved with nitric acid respectively to obtain calcium nitrate solution, europium nitrate solution and lithium nitrate solution; tetrahydrate ammonium molybdate and citric acid are dissolved in water to obtain a concentration of citric acid solution of 0.6g / mL and a concentration of 0.15g / mL ammonium molybdate solutio...

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Abstract

The invention discloses a green light excited red phosphor and a preparation method thereof. The red phosphor is Ca1-nMoO4: nEu3+: xSi: yR, wherein R represents alkali metal ions, and the range of n is greater than or equal to 0.1 but is smaller than or equal to 0.6, the range of x is greater than or equal to 0.01 but is smaller than or equal to 0.1, the range of y is greater than or equal to 0.1but is smaller than or equal to 0.5. The CaCO3-(NH4)6Mo7O24 4H2O is used as a red light emitting matrix material, europium ions, silicon ions and the alkali metal ions serve as activator to be doped,the red phosphor is prepared by using a sol-gel method. The preparation method of the red phosphors is simple. The prepared red phosphor has high luminous efficiency, high color rendering index, goodcolor saturation and stable color temperature, and can be excited by green light.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a red fluorescent powder excited by green light and a preparation method thereof. Background technique [0002] In 1992, the first white LED manufactured by Nichia appeared in a commercial form, and lighting technology entered the LED era. Compared with traditional lighting technology, LED has the following advantages: (1) Energy saving and environmental protection: fluorescent lamps use mercury vapor to emit light , Mercury is a toxic substance that pollutes the environment, while LED lights rely on phosphors to emit light. There are no pollutants in the phosphors, and the light emitted has no radiation; (2) Durable: the use time of incandescent lamps is generally 1,000 hours to 2,000 hours. Hours, the use time of fluorescent lamps is generally 6,000 to 10,000 hours, and the use time of LED lamps is more than three times that of fluorescent lamps; (3) heat generation and ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K11/68H01L33/50
CPCC09K11/7736H01L33/502Y02B20/00
Inventor王忆伍月娜周勤勤
OwnerWUYI UNIV