Nitride red long afterglow fluorescent powder and preparation method thereof

A technology of long-lasting phosphors and nitrides, which is applied in the field of phosphors to achieve the effects of increased afterglow time, wide excitation spectrum, and easy operation

Active Publication Date: 2012-11-07
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline-earth aluminate green and blue long-lasting phosphors doped with rare earth ions have entered the application stage, while red long-lasting phosphors have not been able to meet the nee

Method used

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  • Nitride red long afterglow fluorescent powder and preparation method thereof
  • Nitride red long afterglow fluorescent powder and preparation method thereof
  • Nitride red long afterglow fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh Sr 3 N 2 8.574g, Si 3 N 4 10.768g, Eu 2 o 3 0.405g, Tm 2 o 3 0.178g, La 2 o 3 0.075g, put the above raw materials in a glove box, fully mix them evenly under the protection of argon atmosphere, put them into a molybdenum crucible, then quickly move it into a tube furnace, and then put the Under the protection of a mixed atmosphere, the temperature is gradually raised to 1550 ° C, and the temperature is kept for 10 hours. After grinding, sieving and washing, the chemical composition of Sr can be obtained. 1.92 Si 5 N 8 : 0.05Eu, 0.02Tm, 0.01La samples. Its excitation spectrum see figure 1 , the monitoring wavelength is 612nm, from figure 1 It can be seen from the above that the excitation peak of the excitation spectrum is relatively broad, and the excitation effects in the violet, ultraviolet and blue light ranges are very good. Its emission spectrum see figure 2 , the excitation wavelength is 460nm, from figure 2 It can be seen from the above th...

Embodiment 2

[0033] Weigh Sr 3 N 2 8.474g, Si 3 N 4 10.727g, Eu 2 o 3 0.404g, Tm 2 o 3 0.177g, Ho 2 o 3 0.0867g, Er 2 o 3 0.132g, put the above raw materials in a glove box, fully mix them evenly under the protection of nitrogen atmosphere, put them into a molybdenum crucible, then quickly move them into a tube furnace, and then put them under the condition that the volume ratio of hydrogen and nitrogen is 50:50 Under the protection of a mixed atmosphere, the temperature is gradually raised to 1550 ° C, and the temperature is kept for 10 hours. After grinding, sieving and washing with water, the chemical composition of Sr can be obtained. 1.905 Si 5 N 8 : 0.05Eu, 0.02Tm, 0.01Ho, 0.015Er samples. The luminous brightness and afterglow time are shown in Table 1, both of which are higher than those of Comparative Example 1.

Embodiment 3

[0035] Weigh Sr 3 N 2 8.579g, Si 3 N 4 10.775g, EuN0.382g, Tm 2 o 3 0.178g, Dy 2 o 3 0.0859g, put the above raw materials in a glove box, fully mix them evenly under the protection of argon atmosphere, put them into a molybdenum crucible, then quickly move them into a tube furnace, and then put them under the condition that the volume ratio of hydrogen and nitrogen is 75:25 Under the protection of a mixed atmosphere, the temperature is gradually raised to 1550 ° C, and the temperature is kept for 10 hours. After grinding, sieving and washing, the chemical composition of Sr can be obtained. 1.92 Si 5 N 8 : 0.05Eu, 0.02Tm, 0.01Dy samples. The luminous brightness and afterglow time are shown in Table 1, both of which are higher than those of Comparative Example 1.

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Abstract

The invention relates to nitride red long afterglow fluorescent powder and a preparation method thereof. The chemical structural formula of the fluorescent powder is as follows: L2-x-y-zSimNn: xEu, yR1, zR2(1), wherein the x is larger than or equal to 0.001 and less than or equal to 0.1; the y is larger than or equal to 0.001 and smaller than or equal to 0.05; the z is larger than or equal to 0.001 and smaller than or equal to 0.05; the m is larger than or equal to 4 and smaller than or equal to 6; the n is larger than or equal to 7 and smaller than or equal to 9; L is one of Ca, Sr and Ba; R1 is Lu or Tm; and R2 is one or a free combination of two of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Yb. The invention further relates to a preparation method for the fluorescent powder. According to the invention, three or more rare earth elements are adulterated; after excitation of an excitation light source stops, the afterglow time of the red long afterglow fluorescent powder is remarkably improved compared with rare earth double-doped nitride fluorescent powder, and has characteristics of stable chemical performance, environment protection and the like, and is a novel red long afterglow lighting material.

Description

technical field [0001] The invention relates to a phosphor, in particular to a nitride red long-lasting phosphor that can be effectively excited by ultraviolet or purple light and a preparation method thereof. Background technique [0002] Rare earth long afterglow phosphor is a new type of energy-saving and environmentally friendly material. It can absorb the energy of sunlight or light, store part of the energy, and then slowly release it in the form of visible light. This feature can be widely used in lighting, indication and decoration, etc. In recent years, it has been gradually extended to high-tech fields such as information storage, radiation detection and imaging display. [0003] The earlier long-lasting luminescent materials studied by people are sulfide materials with Cu or Ag as the activator, such as alkaline earth sulfide, zinc sulfide, etc. However, sulfide long-lasting luminescent materials have obvious disadvantages, such as low luminance, short luminescen...

Claims

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Application Information

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IPC IPC(8): C09K11/59
Inventor 滕晓明何锦华梁超符义兵刘凯
Owner JIANGSU BREE OPTRONICS CO LTD
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