Rare-earth red light-emitting material for converting purple light LED into white light and preparation process thereof
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A technology of red light emission and purple light, which is applied in the field of red light-emitting materials and its preparation, can solve problems such as unstable performance and affecting light-emitting performance, and achieve the effect of improving luminous efficiency
Inactive Publication Date: 2010-04-14
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology
Existing rare earth-activated red luminescent materials such as CaS:Eu 3+ , SrCaS:Eu 3+ , Y 2 o 2 S:Eu 3+ , SrSiO 4 :Eu 3+ Unstable performance, affecting its luminous performance
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example 1
[0018] ①According to the chemical structural formula M 4-3a-3b-2c ·(MoO 4 ) 2 :R a · R b ·N c , when M is Li element, R a is Eu element, R b When it is Tb element, N c When it is metal Pb element, take the following high-purity materials by weight percentage:
[0019] Li 2 CO 3 : 11.51% Eu 2 o 3 : 28.70%
[0020] Tb 4 o 7 : 0.76% MoO 3 : 58.75%
[0021] PbO: 0.3%
[0022] ② Grind and mix the above-mentioned weighed materials evenly, put them into an alumina crucible, cover them, put them in a high-temperature furnace, and sinter for the first time in air at 400°C for 1 hour.
[0023] ③ After cooling, take it out and grind it, then put it into an alumina crucible, cover it in a high-temperature furnace, and sinter it in the air for a second time at 700°C for 2 hours. After cooling, take it out and grind it, you can get a product that emits bright red light under the excitation of ultraviolet 365nm and purple LED. Crystal powder.
example 2
[0025] According to the chemical structure M 4-3a-3b-2c ·(MoO 4 ) 2 :R a · R b ·N c , when M is Li element, Ra is Eu element, R b When it is Tb element, N c When it is metal Pb element, take the following high-purity materials by weight percentage:
[0026] Li 2 CO 3 : 8.86% Eu 2 o 3 : 31.8%
[0027] MoO 3 : 57.82% Tb 4 o 7 : 1.12%
[0028] PbO: 0.4%
[0029] The first sintering is at 450°C for 1 hour, and the second sintering is at 750°C for 2 hours. The sintering synthesis steps are the same as in Example 1.
example 3
[0031] According to the chemical structure M 4-3a-3b-2c ·(MoO 4 ) 2 :R a · R b ·N c , when M is Li element, R a is Eu element, R b When it is Tb element, N c When it is metal Pb element, take the following high-purity materials by weight percentage:
[0032] Li 2 CO 3 : 10.95% Eu 2 o 3 : 28.59%
[0033] MoO 3 : 58.49% Tb 4 o 7 : 1.52%
[0034] PbO: 0.45%
[0035] The first sintering temperature is 450°C for 2 hours, the second sintering is 800°C for 2 hours, the sintering synthesis steps are the same as in Example 1
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Abstract
The invention relates to a rare-earth red light-emitting material for converting purple light LED into white light and a preparation process thereof, which belong to the technical field of light emission and display and relate to a red light-emitting material and the preparation process thereof. The structural formula of the red light-emitting material includes M4-3a-3b-2c (MoO4) 2: RaRbNc, wherein the M is an alkali metal Li element, the Ra is a rare-earth activator Eu element, the Rb is a rare-earth sensitizer Tb element, and the Nc is a metal sensitizer Pb element. Materials of the structural formula M4-3a-3b-2c (MoO4) 2: RaRbNc are weighed according to percentage by weight; the weighed materials after being grinded and mixed evenly are placed into an aluminum trioxide crucible and sintered for 1-2 hours in a 400-600 DEG C high-temperature furnace; after being cooled, the materials are fetched out, pulverized, placed into the crucible again and sintered for 2-3 hours in 700-1000 DEG C air atmosphere in the high-temperature furnace; after being cooled, the materials are fetched out and pulverized again, and crystalline powders are obtained and can emit bright red light by stimulation of 365 nanometers and a purple light LED. After the crystalline powders are mixed with rare-earth light-emitting materials emitting green and blue light according to a certain proportion, white light can be emitted by coating the crystalline powders onto a purple light LED tube core.
Description
technical field [0001] The invention belongs to the technical field of luminescence and display, and relates to a red luminescent material and a preparation method thereof. Background technique [0002] Due to the rapid development of semiconductor (light-emitting diode) technology, white LEDs have become the focus of research all over the world due to their high luminous efficiency, high color rendering, environmental protection, long life and many other advantages. The technology of blue LED to convert white light has matured, and the technology of the next generation of purple LED to convert white light is on the rise. In order to further improve the luminous efficiency and color rendering index of purple LEDs to convert white light, so as to make them practical for commercial use, on the one hand, it is necessary to improve the chip technology of purple LEDs, and on the other hand, it is necessary to improve the three primary colors of rare earth used in white light conv...
Claims
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