Nitride fluorescent powder and preparation method thereof

A technology of nitride phosphor and chemical formula, which is applied in the field of phosphor to achieve the effects of improved thermal stability and structural stability, long life, and wide excitation wavelength range

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

[0004] However, with the increase in power of white LEDs, the requirements for heat resistance and durability of phosphors are increasing, and the existing phosphors cannot meet such requirements.

Method used

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  • Nitride fluorescent powder and preparation method thereof
  • Nitride fluorescent powder and preparation method thereof
  • Nitride fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh Sr 3 N 2 (4N)0.012mol, Ca 3 N 2 (4N)0.0064mol, Si 3 N 4 (4N)0.02mol, AlN(4N)0.06mol, Cu 3 N(4N) 0.0008mol, EuN(4N) 0.0036mol; the above raw materials were mixed and ground in a glove box, put into a molybdenum crucible, and then quickly moved into an atmosphere furnace, and heated at 1800°C under 1MPa NH 3 Insulated in the atmosphere for 5 hours, the resulting product is crushed, pickled to remove impurities, sieved, and dried to obtain Sr 0.6 Ca 0.32 SiAlN 3 :Cu + 0.04 Eu 2+ 0.06 Phosphor. It emits broadband visible light with a peak at 610-690nm under the excitation of blue light, purple light or ultraviolet light, and its emission spectrum is shown in figure 1 , whose temperature dependence is shown in figure 2 .

Embodiment 2

[0038] Weigh and weigh Sr 3 N 2 (4N)0.0124mol, Ca 3 N 2 (4N)0.0064mol, Si 3 N 4 (4N) 0.02mol, AlN(4N) 0.06mol, EuN(4N) 0.0036mol; the above raw materials were mixed and ground in the glove box and put into the molybdenum crucible, and then quickly moved into the atmosphere furnace, at 1800 ℃ 0.1MPa NH 3 Insulated in the atmosphere for 5 hours, the resulting product is crushed, washed to remove impurities, classified by air flow, and dried to obtain Sr 0.6 Ca 0.32 SiAlN 3 :Mn2+ 0.02 Eu 2+ 0.06 Phosphor. For a comparison of the emission temperature characteristics of Example 2 and Comparative Example 1, see image 3 .

Embodiment 3

[0040] Weigh Ca 3 N 2 (4N)0.0552mol, Si 3 N 4 (4N)0.02mol, AlN(4N)0.06mol, Cu 3 N (4N) 0.0008mol, EuN (4N) 0.0036mol; put the above raw materials into the molybdenum crucible after mixing and grinding in the glove box, and then quickly move it into the atmosphere furnace, in 2100 ℃ 5MPa nitrogen-hydrogen mixed atmosphere (N 2 / H 2 The volume ratio is 70:30) for 2 hours, and the obtained product is crushed, alkali washed to remove impurities, hydraulically classified, and dried to obtain Ca 0.92 SiAlN 3 :Cu + 0.04 Eu 2+ 0.06 Phosphor.

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Abstract

The invention relates to a nitride fluorescent powder of which the chemical formula is LxSiAlN3:RyEu2+1-x-y, wherein 0.8<=x<=0.95, 0.01<=y<=0.18, L is selected from one or combination of Ca and Sr, and R is selected from one or combination of Cu and Mn. The invention also relates to a preparation method of the fluorescent powder. The nitride fluorescent powder provided by the invention can be effectively excited by ultraviolet, purple or blue light, and has higher heat stability and structure stability; the fluorescent powder provided by the invention has the characteristics of wide excitation wavelength range, high efficiency, high stability and the like; and the luminescent device made of the fluorescent powder has the characteristics of long service life and high luminescence efficiency.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to an improved nitride fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light and a preparation method thereof. Background technique [0002] Silicon nitride LED red phosphor powder can well meet the requirements of LED applications in terms of stability and luminous efficiency, while CaSiAlN 3 :Eu 2+ Due to its important characteristics such as longer emission wavelength and higher thermal stability, it has very broad development prospects. [0003] In 2006, Uheda et al. of Tokyo University of Technology (Tokyo University of Technology,) studied CaO-AlN-Si 3 N 4 Based on the study of the phase diagram, a new type of red phosphor powder for LED was invented, and its performance was found to be better than that of the existing La 2 o 2 S:Eu 3+ and Ca 2 Si 5 N 8 :Eu 2+ Higher efficiency and more stable performance. Nichia applied for (Ca ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64H01L33/50
Inventor 何锦华滕晓明梁超符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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