Single matrix white phosphor for LED (light emitting diode) and preparation method thereof
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A fluorescent powder and white light technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult color matching and low color rendering of LEDs, and achieve the effect of high color rendering index and fine and uniform particles
Inactive Publication Date: 2013-05-08
CHONGQING UNIV
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For example, BaSrMg(PO 4 ) 2 :Eu 2+ It belongs to the multi-site single-matrix phosphor. The emission spectrum of this type of phosphor is mixed with blue light and yellow light to form white light. Because there is only one activator, its color matching is more difficult.
NaSr reported by Chongfeng Guo et al. (Optics & Laser Technology, 2011, 43:1351-1354) 4 (BO 3 ) 3 : Ce 3+ ,Tb 3+ , and Ca reported by Ki Hyuk Kwon et al. (Inorg.Chem.2009,48:11525-11532) 6-x-y Mg x-z (PO 4 ) 4 :Eu y 2+ ,Mn z 2+ , and the Sr disclosed in the Chinese patent application number 200910272541.9 2-m Mg 3-n P 4 o 15 :Eu m 2+ ,Mn n 2+ Equal-energy-transfer single-matrix phosphors have only two light-emitting centers, blue and red, and the color rendering of LEDs formed by encapsulation is not high; there are not many reports on single-matrix phosphors with three activators. Guogang Li et al. (ACS Appl .Mater.Interfaces, 2012, 4:296-305) reported Ca 4 Y 6 (SiO 4 ) 6 O:Ce 3+ / Mn 2+ / Tb 3+ Phosphor, and BaMg reported by Wei Lü et al. (Inorg.Chem.2011.50.7846-7851) 2 al 6 Si 9 o 30 :Eu 2+ ,Tb 3+ ,Mn 2+ Phosphor, Sr reported by Xi Chen et al. (Journal of Luminescence, 2011, 131:2697-2702) 1.5 Ca 0.5 SiO 4 :Eu 3+ ,Tb 3+ , Eu 2+ Phosphor powder, this type of single-matrix phosphor has a high color rendering index, but most of them are silicate borate matrix, and its synthesis method is mostly limited to solid-phase sintering method, the preparation temperature is high, the shape is uneven, and the phosphor particles The diameter is large, and multiple ball milling is required, and ball milling will reduce the luminous intensity of the phosphor; the Chinese patent application number 201210110827.9 discloses a single-matrix white light phosphor for near-ultraviolet excitation white light LEDs, and its chemical expression is: NM 1-x-y-z PO4: xR, yG, zB, wherein N is selected from at least one of the group consisting of Li, Na, K; M is selected from at least one of the group consisting of Mg, Ca, Sr, Ba, Zn; R At least one selected from the group consisting of Mn, Sm; G is Tb; B is at least one selected from the group consisting of Ce, Eu, and 0
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Embodiment 1
[0015] Weigh anhydrous Na 2 CO 3 , Mg(OH) 2 4MgCO 3 ·6H 2 O, Tb(NO 3 ) 3 , NH 4 h 2 PO 4 , Eu(NO 3 ) 3 ·6H 2 O, Mn(NO 3 ) 2 0.2208g, 1.1335g, 0.3775g, 1.1503g, 0.0170g, 0.4560g respectively. Mix the above substances in acetone solvent and grind for 60min; 2 / H 2 The volume ratio is 9:1) and baked at 1000℃ for 5h. The molecular formula of the prepared phosphor is: Na 2.5 Tb 0.5 Mg 7 (PO 4 ) 6 : 0.004Eu, 0.255Mn, the maximum excitation wavelength is 365nm, can emit 430nm blue light, 543nm green light and 580nm orange light, the test result is white light, color coordinates (0.31, 0.34).
Embodiment 2
[0017] Weigh anhydrous Na 2 CO 3 , Mg(OH) 2 4MgCO 3 ·6H 2 O, Tb(NO 3 ) 3 , NH 4 h 2 PO 4 , Eu(NO 3 ) 3 ·6H 2 O, Mn(NO 3 ) 2 Respectively 0.2208g, 1.1335g, 0.3775g, 1.1503g, 0.0170g, 0.4560g Mix the above substances in acetone solvent, grind for 30min; mix the uniform powder in a nitrogen-hydrogen mixed atmosphere (N 2 / H 2 The volume ratio is 9:1) and baked at 1000℃ for 5h. The molecular formula of the prepared phosphor is: Na 2.5 Tb 0.5 Mg 7 (PO 4 ) 6: 0.004Eu, 0.255Mn, the maximum excitation wavelength is 365nm, can emit 430nm blue light, 543nm green light and 580nm orange light, the test result is white light, color coordinates (0.30, 0.34).
Embodiment 3
[0019] Weigh anhydrous Na 2 CO 3 , Mg(OH) 2 4MgCO 3 ·6H 2 O, Tb(NO 3 ) 3 , NH 4 h 2 PO 4 , Eu(NO 3 ) 3 ·6H 2 O, Mn(NO 3 ) 2 Respectively 0.2208g, 1.1335g, 0.3775g, 1.1503g, 0.0170g, 0.4560g Mix the above-mentioned substances in acetone solvent, grind for 120min; mix the uniform powder in a nitrogen-hydrogen mixed atmosphere (N 2 / H 2 The volume ratio is 9:1) and baked at 1000℃ for 5h. The molecular formula of the prepared phosphor is: Na 2.5 Tb 0.5 Mg 7 (PO 4 ) 6 : 0.004Eu, 0.255Mn, the maximum excitation wavelength is 365nm, can emit 430nm blue light, 543nm green light and 580nm orange light, the test result is white light, color coordinates (0.31, 0.34).
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Abstract
The invention provides single matrix white phosphor for an LED (light emitting diode) and a preparation method thereof. The chemical expression of the phosphor is Na2.5Tb0.5Mg7(PO4)6:xEu,yMn, wherein x is greater than 0 and less than 0.1 and y is greater than 0 and less than 0.5. The phosphor prepared by the method is fine and uniform in granules, can emit red, green and blue bands after being excited by 350-410nm near ultraviolet and can be used for the white LED excited by the near ultraviolet.
Description
technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a single-matrix white light fluorescent powder for near-ultraviolet excited white LEDs and a preparation method thereof. Background technique [0002] Light Emitting Diode (LED, Light Emitting Diode) is a new type of light emitting device, it not only has low power consumption, long life, low working voltage, environmental protection, safety, fast response, high reliability, less maintenance, small size, weight Lightweight and other advantages, and can emit blue light, green light, purple light or deep ultraviolet light, making LED white light a reality, is one of the high-tech countries' key development. [0003] At present, there are mainly three ways to realize the light-converting white light LED: ① blue light chip + yellow phosphor powder: the blue light LED chip is used as the basic light source to excite the yellow phosphor powder, and the complement...
Claims
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