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Red fluorescent powder excited by dual-band ultraviolet light as well as preparation method and application of red fluorescent powder

A technology of red phosphor powder and red light, applied in the field of red phosphor powder and its preparation, can solve unseen and other problems

Pending Publication Date: 2022-02-01
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But no use of Eu 3+ , Mn 4+ The luminescence characteristics of co-doped synthetic aluminate phosphors to achieve broadband ultraviolet light excitation, broadband red region emission (near red to far red region), and the report of its application in plant cultivation

Method used

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  • Red fluorescent powder excited by dual-band ultraviolet light as well as preparation method and application of red fluorescent powder
  • Red fluorescent powder excited by dual-band ultraviolet light as well as preparation method and application of red fluorescent powder
  • Red fluorescent powder excited by dual-band ultraviolet light as well as preparation method and application of red fluorescent powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] La 0.95 Al 0.8 Ga 0.2 o 3 :0.05Eu 3+ ,0.0005Mn 4+

[0034] The present embodiment provides a kind of preparation method of red fluorescent powder, comprises the steps:

[0035] (1) Weigh the raw materials according to the stoichiometric ratio, the specific implementation is as follows: 7.7380 g lanthanum oxide (La 2 o 3 ), 3.1202g aluminum hydroxide (Al(OH) 3 ), 0.9372 g gallium oxide (Ga 2 o 3 ), 0.44 g europium oxide (Eu 2 o 3 ) and 0.0029 g manganese carbonate (MnCO 3 ) to mix and grind evenly to obtain mixed powder;

[0036] (2) Pour the above mixed powder into an alumina crucible, calcinate in a box-type high-temperature furnace at 1500 °C for 5.0 h, cool to room temperature, and fully grind to obtain La 0.95 Al 0.8 Ga 0.2 o 3 :0.05Eu 3+ ,0.0005Mn 4+ red phosphor.

Embodiment 2

[0038] La 0.93 Al 0.7 Ga 0.3 o 3 :0.07Eu 3+ ,0.0005Mn 4+

[0039] The present embodiment provides a kind of preparation method of red fluorescent powder, comprises the steps:

[0040] (1) Weigh the raw materials according to the stoichiometric ratio, the specific implementation is as follows: 7.5751 g lanthanum oxide (La 2 o 3 ), 2.7301g aluminum hydroxide (Al(OH) 3 ), 1.4058 g gallium oxide (Ga 2 o 3 ), 0.616 g europium oxide (Eu 2 o 3 ) and 0.0029 g manganese carbonate (MnCO 3 ) to mix and grind evenly to obtain mixed powder;

[0041] (2) Pour the above mixed powder into an alumina crucible, calcinate in a box-type high-temperature furnace at 1500 °C for 5.0 h, cool to room temperature, and fully grind to obtain La 0.93 Al 0.7 Ga 0.3 o 3 :0.07Eu3+ ,0.0005Mn 4+ red phosphor. Under the excitation of ultraviolet light, the phosphor emits red light and far-red light. And the luminous flux can be artificially adjusted by changing the phosphor composition to pr...

Embodiment 3

[0043] La 0.75 Gd 0.2 AlO 3 :0.05Eu 3+ ,0.001Mn 4+

[0044] (1) Weigh the raw materials according to the stoichiometric ratio, and the specific implementation is as follows: 6.1089 g lanthanum oxide (La 2 o 3 ), 1.813 g gadolinium oxide (Gd 2 o 3 ), 3.9002 g aluminum hydroxide (Al(OH) 3 ), 0.44 g europium oxide (Eu 2 o 3 ) and 0.0057 g manganese carbonate (MnCO 3 ) to mix and grind evenly to obtain mixed powder;

[0045] (2) Pour the above mixed powder into an alumina crucible, calcinate in a box-type high-temperature furnace at 1500 °C for 5.0 h, cool to room temperature, and fully grind to obtain La 0.75 Gd 0.2 AlO 3 :0.05Eu 3+ ,0.001Mn 4+ red phosphor.

[0046] The fluorescent powder prepared by the embodiment of the present invention 2, the X-ray powder diffraction pattern is as follows figure 1 As shown, the excitation spectrum (monitored at 619 nm) as figure 2 As shown, the excitation spectrum (monitored at 720 nm) as image 3 As shown, the emission ...

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Abstract

The invention provides red fluorescent powder as well as a preparation method and application thereof. The red fluorescent powder is a compound represented by a formula I: REmMaO3: bEu<3+>, cMn<4+>, wherein RE comprises one or two selected from the group consisting of La, Y, Gd, Lu and Sc; the sum of the atomic numbers of RE elements is m, and m is more than 0 and less than 1; M comprises one or two selected from Al and Ga; and the sum of the atomic numbers of M elements is a, and a is more than 0 and less than 1. The preparation method comprises the following steps: with lanthanum oxide, aluminum hydroxide, gallium oxide, europium oxide and manganese carbonate as raw materials, carrying out high-temperature solid-phase reaction in an air atmosphere, and carrying out maintaining for 4-6 hours at 1400-1600 DEG C in a box-type furnace. The fluorescent powder has the properties of converting B-band ultraviolet light into red light with a main peak of 619 nm and converting A-band ultraviolet light into far-red light with a main peak of 720 nm, the emission spectrum of the fluorescent powder is overlapped with the absorption spectrum of plant chlorophyll b and the absorption spectrum of PFR pigment, and when the red fluorescent powder is applied to the field of gardening or agriculture, growth of plants can be promoted.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a red fluorescent powder and its preparation method and application. Background technique [0002] Light is not only the energy source for plant growth, but also controls physiological processes such as growth and differentiation of plant cells. The blue light band (400-500 nm), red light band (600-680 nm) and far-red light band (680-760 nm) in sunlight correspond to the promotion of plant photosynthesis, phototropism and photomorphogenesis, respectively. Converting ultraviolet light into red and far-red light can maximize the use of sunlight for agricultural production. [0003] The influence of light on plants is mainly reflected in the light time, intensity and light quality. Among them, light quality is an important part of light conditions. Light signals with different light qualities are closely related to plant growth and development, yield and plant qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80A01G7/04
CPCC09K11/7787A01G7/04
Inventor 廉世勋丁帆
Owner HUNAN NORMAL UNIVERSITY
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