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Dark red fluorescent powder and preparation method thereof
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A phosphor and deep red technology, which is applied in the field of deep red phosphor for LED and its preparation, can solve the problems of harsh production equipment, poor chemical stability of sulfide phosphor and easy decomposition, etc., and achieves low cost, easy operation and preparation. simple method effect
Active Publication Date: 2014-09-10
JIANGSU BREE OPTRONICS CO LTD
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Abstract
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Problems solved by technology
Sulfide phosphors have poor chemical stability and are easy to decompose, while Eu 2+ To activate nitride red phosphors, the matrix needs to be synthesized under high temperature and pressure (1600°C, above 10 atmospheres), which is too demanding for production equipment
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Embodiment 1
[0030] 1. Weigh 3.47molMgO, 0.49molMgF 2 , 1molGeO 2 , 0.02molMnCO 3 , 0.01molNH 4 Cl, 0.005molLi 2 CO 3 And 0.01molNaF, the raw materials are all analytically pure.
[0031] 2. Put the above raw materials in the mixing tank and mix them evenly.
[0032] 3. Put the mixture into a crucible and put it into an air atmosphere furnace, and sinter at 1200° C. for 6 hours.
[0033] 4. Put the powder block obtained in step 3 into a crucible after crushing, put it into an air atmosphere furnace, and sinter at 900° C. for 2 hours.
[0034] 5. Crush the powder block obtained in step 4 and pass through a 300-mesh sieve to obtain deep red fluorescent powder. The chemical formula is:
[0035] Mg 3.96 Ge O 5.5 f 0.99 Cl 0.01 :Mn 0.02， Li 0.01， Na 0.01 .
Embodiment 2
[0037] 1. Weigh 3.47molMgO, 0.48molMgF 2 , 1molGeO 2 , 0.03molMnCO 3 , 0.02molNH 4 Cl, 0.005molNa 2 CO 3 And 0.01molKF, raw materials are all analytically pure.
[0038] 2. Put the above raw materials in the mixing tank and mix them evenly.
[0039] 3. Put the mixture into a crucible and put it into an air atmosphere furnace, and sinter at 1250° C. for 5 hours.
[0040] 4. Put the powder block obtained in step 3 into a crucible after crushing, put it into an air atmosphere furnace, and sinter at 1000° C. for 3 hours.
[0041] 5. Crush the powder block obtained in step 4 and pass through a 300-mesh sieve to obtain deep red fluorescent powder. The chemical formula is:
[0042] Mg 3.95 Ge O 5.5 f 0.98 Cl 0.02 :Mn 0.03， Na 0.01， K 0.01 .
Embodiment 3
[0044] 1. Weigh 3.43molMgO, 0.49molMgF 2 , 0.95molGeO 2 , 0.05molSiO 2 , 0.04molMnCO 3 , 0.02molNH4Cl, 0.01molNa 2 CO 3 and 0.01molBi 2 o 3 , all raw materials were analytically pure.
[0045] 2. Put the above raw materials in the mixing tank and mix them evenly.
[0046] 3. Put the mixture into a crucible and put it into an air atmosphere furnace, and sinter at 1150° C. for 7 hours.
[0047] 4. Put the powder block obtained in step 3 into a crucible after crushing and put it into an air atmosphere furnace, and sinter at 1050° C. for 4 hours.
[0048] 5. Crush the powder block obtained in step 4 and pass through a 300-mesh sieve to obtain a deep red phosphor with the chemical formula Mg 3.92 Ge 0.95 Si 0.05 o 5.5 f 0.98 Cl 0.02 :Mn 0.04， Na 0.02， Bi 0.02 .
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Abstract
The invention provides dark red fluorescent powder for a light-emitting diode (LED). The dark red fluorescent powder is characterized by having a chemical expression Mg4-x-yG O5.5J:Mnx,Ry, wherein G is at least one of Si, Ge and Sn, and is necessary; J is at least one of F and Cl, and is necessary; R is at least one of Li, Bi, Pr, Na, and K; and x is 0.005 to 0.1, and y is 0.0005 to 0.05. A preparation method comprises the following steps of: accurately weighing compound raw materials containing Mg, G, J, Mn and R in a chemical dose ratio of the fluorescent powder, adding a certain amount of aid and grinding, uniformly mixing, placing at air atmosphere, and sintering twice, and performing aftertreatment to obtain the red fluorescent powder. The red fluorescent powder can be effectively excited by blue light, is high in light and heat stability, and red light-emitting intensity, and has ideal color purity. The dark red fluorescent powder is low in cost, and is non-toxic and pollution-free.
Description
technical field [0001] The invention belongs to the technical field of solid luminescent materials, and in particular relates to a deep red fluorescent powder for LEDs activated by tetravalent manganese that can be effectively excited by blue light and a preparation method thereof. Background technique [0002] The white light scheme based on blue LED chips to excite yellow light emitting phosphors has the advantages of high luminous efficiency, relatively low cost, and simple manufacturing process, and has become the mainstream method of white light LEDs today. However, due to the lack of red spectral components (above 600nm) in the emission spectrum of the white LED manufactured by this scheme, the color rendering is low, and the color rendering index generally can only reach 70, which cannot meet the color rendering requirements of ordinary lighting sources. And by adding a small amount of red powder to the existing yellow phosphor, its color rendering index will be great...
Claims
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