LED device containing alkaline earth boron phosphate luminescent powder

A technology of LED devices and borophosphates, applied in semiconductor devices, electrical components, luminescent materials, etc., to achieve high color rendering index, reasonable spectral energy distribution, and good consistency

Inactive Publication Date: 2006-10-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But similar compounds and near-ultraviolet LEDs are made into blue-green LEDs and further combined with RE 3 (Al) 5 o 12 : Ce (RE=Y or / and Tb) and other yellow-red phosphor powder mixed use to make white LED application has not been reported

Method used

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  • LED device containing alkaline earth boron phosphate luminescent powder
  • LED device containing alkaline earth boron phosphate luminescent powder
  • LED device containing alkaline earth boron phosphate luminescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (Sr 0.96 Eu 0.04 ) 6 B 1.08 P 4.95 o 20 Preparation: Weigh raw materials

[0023] SrCO 3 : 3.4014g

[0024] Eu 2 o 3 : 0.1689g

[0025] h 3 BO 3 : 0.2671g

[0026] NH 4 h 2 PO 4 : 2.2776g

[0027] Grind and mix the raw materials of the mixture evenly, burn in air at 600°C for 1 hour, pulverize, grind and mix evenly after cooling, and then sinter in CO at 1250°C for 5 hours to obtain the alkaline earth borophosphate phosphor product. figure 1 For this phosphor excitation, emission spectrum.

[0028] Ca 8.2 mn 0.6 Eu 1.2 (PO 4 ) 6 Cl 2 Preparation: Weigh the raw materials separately

[0029] CaO: 0.2688g

[0030] MnO 2 : 0.2086g

[0031] Eu 2 o 3 : 0.8448g

[0032] CaHPO 4 .2H 2 O: 4.1302g

[0033] CaCl 2 : 0.4437g

[0034] Burn in air at 600°C for 3 hours, after cooling, pulverize, grind and mix evenly, then burn in charcoal at 1100°C for 5 hours, cool, crush and sieve to obtain the desired phosphor.

[0035] White light LED packaging: m...

Embodiment 2

[0037] (Sr 0.84 Eu 0.16 ) 6 B 0.6 P 5.24 o 20 Preparation: Weigh raw materials

[0038] SrCO 3 : 2.9762g

[0039] Eu 2 o 3 : 0.6756g

[0040] h 3 BO 3 : 0.1484g

[0041] (NH 4 ) 2 HPO 4 : 2.7680g

[0042] After grinding and mixing the raw materials of the mixture evenly, calcine at 500°C for 3 hours in air, pulverize, grind and mix evenly after cooling, and then sinter at 1000°C for 4 hours in a mixed atmosphere of hydrogen and nitrogen to obtain the product.

[0043] Ca 5 Sr 3.9 mn 0.9 Eu 0.2 (PO 4 ) 6 Cl 2 Preparation: Weigh the raw materials separately

[0044] SrCO 3 : 1.1220g

[0045] MnO 2 : 0.3130g

[0046] Eu 2 o 3 : 0.1408g

[0047] CaHPO 4 2H 2 O: 3.4418g

[0048] SrHPO 4 : 0.7345g

[0049] SrCl 2 : 0.6341g

[0050] Burn in air at 650°C for 1 hour, cool, pulverize, grind and mix evenly, then burn at 900°C for 6 hours in an ammonia reducing atmosphere, cool, crush and sieve to obtain the desired phosphor. figure 2 is the emissio...

Embodiment 3

[0053] (Sr 0.94 Eu 0.06 ) 6 BP 5 o 20 Preparation: Weigh raw materials

[0054] SrCO 3 : 3.3305g

[0055] Eu 2 o 3 : 0.2534g

[0056] h 3 BO 3 : 0.2473g

[0057] NH 4 h 2 PO 4 : 2.3006g

[0058] Grind and mix the raw materials of the mixture evenly, burn at 550°C for 3 hours in the air, pulverize, grind and mix evenly after cooling, and then sinter at 1100°C for 4 hours in a mixed atmosphere of hydrogen and nitrogen to obtain the product.

[0059] Blue-green LED packaging: mix the obtained phosphor powder with epoxy resin at a weight ratio of 1:5 to make a slurry, then directly coat the slurry on the surface of the purple LED crystal grains by coating, and finally cure and form at 150°C , That is, the LED device is obtained. Rare-earth phosphor absorbs light from the violet LED chip and emits blue-green light. The color coordinate parameters of the blue-green LED converted by ultraviolet LED are mainly determined by the phosphor powder. The consistency of the...

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PUM

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Abstract

The invention relates to the LED domain, especially to a LED unit containing fluorescent powder of alkaline earth borophosphate. The LED unit of this invention consists of violet LED grain and rare-earth phosphor, in which the said rare-earth phosphor is alkaline earth borophosphate with a chemical composition expression of (Sr1-xEu2+x)6BmPnO20,0x=0.2,0m1.5, 4.5n5.5 and the said violet LED grain is inorganic semiconductor LED grain of GaN base in which the emitted near ultraviolet lights lie in area between 330nm and 420nm receiving priority in area between 350nm and 410nm. The said alkaline earth borophosphate can be added with other fluorescent powder to constitute bi-component rare-earth phosphor or tri-component rare-earth phosphor to prepare white LED unit. The LED unit of this invention is of high stability and good compatibility, suitable for batch process, and can be used in display and decorative lighting area. The packed white LED unit is of reasonable spectral energy distribution, which can make up for shortcomings of low color index of white light of traditional white LED unit, and has high color index.

Description

technical field [0001] The invention relates to the field of LEDs, in particular to an LED device containing alkaline earth borophosphate fluorescent powder. Background technique [0002] Ga(In)N-based light-emitting diode (LED) is a new type of light-emitting device, which has the characteristics of small size, long life and energy saving, and is widely used in lighting and display fields. In recent years, with the rapid development of blue and near-ultraviolet LEDs, white light-emitting diodes are expected to replace fluorescent lamps as a new generation of light sources in the 21st century. [0003] At present, it is widely used. The LED that emits white light is Ga(In)N that emits blue at about 460nm and Y that emits yellow light. 3 al 5 o 12 :: Ce 3+ (YAG:Ce 3+ ) phosphors are combined to produce (US Patent 5,998,925 and European Patent 862,794), the principle is YAG:Ce 3+ The fluorescent material absorbs the blue light of about 450nm emitted by the blue LED and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 王静张梅吴昊丁唯嘉苏锵
Owner SUN YAT SEN UNIV
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