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Red fluorescent material and preparation method thereof

A technology of red fluorescent and red fluorescent powder, applied in the field of materials science, can solve the problems of large environmental pollution and poor chemical stability of fluoride fluorescent powder, and achieve the effect of low cost, low cost and reducing the center of mass of excited states

Active Publication Date: 2018-08-10
SHANGHAI QISHEN ENG PLASTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems in the prior art, the present invention provides a red fluorescent material and a preparation method thereof. The red fluorescent material and the preparation method thereof shall solve the problem of preparing fluoride phosphor powder for commercial white LEDs in the prior art. When using high concentration hydrofluoric acid, it will cause great environmental pollution, and the technical problem of poor chemical stability of fluoride phosphor

Method used

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  • Red fluorescent material and preparation method thereof
  • Red fluorescent material and preparation method thereof
  • Red fluorescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Raw material CaCO3 , Nb 2 o 5 , Al 2 o 3 , MnO 2 According to Ca 2 AlNbO 6 :xMn 4+ (x=0.02) stoichiometric ratio was weighed, mixed evenly in a mortar, put into a corundum crucible with a cover and pre-fired at 850°C for 12h, after taking it out, it was fully ground, and then placed at 1250°C, 1500°C and fired for 12h respectively to obtain Ca 2 AlNbO 6 :Mn 4+ Phosphor powder: crush the phosphor powder, remove impurities, wash with deionized water until neutral, dry and classify to obtain the finished product. The product is Ca 2 AlNbO 6 :Mn 4+ ,See figure 1 . The sample has an absorption band in the ultraviolet region and green region, respectively located at 355nm and 527nm. Among them, the excitation band in the ultraviolet region is the strongest (355nm), see image 3 . When the detection wavelength is 712nm, Ca 2 AlNbO 6 :Mn 4+ The excitation spectrum see Figure 4 . Under the excitation of short-wave ultraviolet (355nm), it shows red broadband...

Embodiment 2

[0035] Raw material CaCO 3 , Nb 2 o 5 , Al 2 o 3 , MnO 2 , MgO according to Ca 2 AlNbO 6 :xMn 4+ ,yMg 2+ (x = 0.01, y = 0.01) stoichiometric ratio was weighed, mixed evenly in a mortar, put into a corundum crucible with a cover and pre-fired at 950 ° C for 12 hours, after taking it out, it was fully ground, and then placed at 1300 ℃, fired at 1500℃ for 12h and 24h respectively to obtain Ca 2 AlNbO 6 :Mn 4 + ,Mg 2+ Powder, the fluorescent powder is crushed and removed, washed with deionized water until neutral, dried and classified to obtain the finished product. The sample has an absorption band in the ultraviolet region and a green region, respectively located at 355nm and 527nm, and the excitation band in the ultraviolet region is the strongest (355nm). Under short-wave ultraviolet (355nm) excitation, it shows a red broadband emission (620nm-800nm), with the strongest peak at 712nm.

Embodiment 3

[0037] Raw material CaCO 3 , Nb 2 o 5 , Al 2 o 3 , MnO 2 , CaO according to Ca 2 AlNbO 6 :xMn 4+ ,y Ca 2+ (x = 0.01, y = 0.01) stoichiometric ratio was weighed, mixed evenly in a mortar, put into a corundum crucible with a cover and pre-fired at 950 ° C for 12 hours, after taking it out, it was fully ground, and then placed at 1300 ℃, fired at 1500℃ for 12h and 24h respectively to obtain Ca 2 AlNbO 6 :Mn 4 + , Ca 2+ Powder, the fluorescent powder is crushed and removed, washed with deionized water until neutral, dried and classified to obtain the finished product. The sample has an absorption band in the ultraviolet region and a green region, respectively located at 355nm and 527nm, and the excitation band in the ultraviolet region is the strongest (355nm). Under short-wave ultraviolet (355nm) excitation, it shows a red broadband emission (620nm-800nm), with the strongest peak at 712nm.

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Abstract

The invention provides a red fluorescent material. The chemical formula of the red fluorescent material is Ca2AlNbO6: Mn4+, and the luminescence center is a non-rare-earth activator Mn4+. The invention provides a preparation method of the red fluorescent material. The preparation method comprises the following steps: weighing the raw materials according to the molar ratio of the elements, carryingout high-temperature solid-phase reaction, adding a proper amount of flux to control the solid-phase synthesis temperature, introducing a proper amount of a charge compensation agent, ensuring the pure phase range of the sample, furthermore improving the luminous performance of the perovskite structure niobium aluminate red fluorescent material, and finally obtaining high-efficiency and stable red fluorescent powder. The perovskite structure niobium aluminate is used as a matrix, the Mn4+ is used as an activator, no expensive rare earth element is used, the raw materials and the final productare free of harmful substances such as fluorine, and the fluorescent powder is used for strong absorption of exciting light of the ultraviolet band and blue light band, the red light wave with the proper bandwidth is emitted, and the red fluorescent material is suitable for being applied to the fields of illumination and display of warm white light LED devices excited by ultraviolet or blue lightLED chips.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to an inorganic solid luminescent material, specifically a Mn material used in the fields of display and white LED lighting. 4+ Doped red fluorescent powder and its preparation method. Background technique [0002] Semiconductor white light-emitting diode (white LED) is a new generation of solid-state light source, which has the advantages of high efficiency, energy saving, green environmental protection, long life, small size, low working voltage, etc. It is used in general lighting, display, imaging, agriculture, medical, military and other fields . Currently commercial white LEDs are based on InGaN blue LED chips to excite YAG:Ce 3+ Yellow phosphors get white light. However, the disadvantage of the white light obtained by this solution is that the color temperature of the white LED is relatively high and the color rendering index is relatively low due to insufficient red light c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
CPCC09K11/673
Inventor 张彦王洪超杜逸徐家跃向迪施赛楠马文昊伍超宇李星亮
Owner SHANGHAI QISHEN ENG PLASTICS CO LTD
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