Blue-purple light or blue light excitation fluorophor, preparation method thereof, and packaged white light diode

A blue light excitation and phosphor technology, applied in the field of white light diodes, can solve the problems of uneven composition, instability and toxic hydrolysis conditions of the phosphor, and achieve the effects of stable color coordinates, high manufacturing efficiency and excellent characteristics

Inactive Publication Date: 2008-05-28
TIANJIN UNIVERSITY OF TECHNOLOGY
0 Cites 15 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, these phosphors, for example, Sr 3-x SiO 5 :Eu 2+ x , 0
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention belongs to the technical field of photoelectric display materials and devices, which relates to a process for manufacturing phosphor excited by royal purple light or blue light and a white diode which is produced by encapsulating the phosphor and a chip. The components of the phosphor includes Sr3-a-bBaaSi1-cO5: bD, cE, dF and eG, wherein D is divalent Eu, E is trivalent Ce, F is element B, G is univalent Li, and a, b, c, d, and e are atom mole numbers, and number range is that 0.0<=a<=0.2, 0.0<=b<=0.2, 0.0<=c<=0.2, 0.0<=d<=0.2 and 0.0<=e<=0.2. According to the components of the phosphor, a compound silica sol is prepared for processing spray granulation to gain xerogel particles, and phosphor particles are gained by microwave high-temperature heating the xerogel particles. The employment of the components of the phosphor and the process for preparation ensures the easy regulating of the size, appearance, optical spectrum, brightness and luminous efficiency of the phosphor particles, thereby realizing mass production. The white diode is gained by encapsulating the phosphor particles and the royal purple light or blue light GaN (Gallium nitride) base chip.

Application Domain

Technology Topic

Image

  • Blue-purple light or blue light excitation fluorophor, preparation method thereof, and packaged white light diode
  • Blue-purple light or blue light excitation fluorophor, preparation method thereof, and packaged white light diode

Examples

  • Experimental program(3)

Example Embodiment

[0025] Example 1
[0026] According to the composition of the phosphor and the process flow in Figure 1, take a = 0.0, b = 0.05, c = 0.0, d = 0.0, and e = 0.0. Weigh the analytically pure strontium nitrate with a purity of 99.9% and an average size of 10 Nano SiO 2 Put it into a beaker with the spectrally pure europium nitrate. According to the solid:liquid volume ratio=1:10, add deionized water, mechanically stir, titrate with a 30% nitric acid aqueous solution to pH=1, and stir for 3 hours to obtain a composite silica sol. The composite silica sol is sprayed and granulated, and the compressed air temperature is set to 110°C at the inlet temperature and the dry air volume is 100m 3 /h, the material flow is 1L/h, and the dry gel particles are obtained; the dry gel particles are put into a corundum crucible and pre-fired in a common muffle furnace at a temperature of 600°C for 3 hours, and the pre-fired powder is obtained after natural cooling. Place the crucible containing the pre-fired powder in an industrial microwave oven, and first pass N with a flow rate of 2L/h 2 +5%H 2 (Volume ratio) The mixed gas is fired at 1200°C for 3 hours at a controlled temperature, then the power is turned off and cooled to obtain phosphor particles.
[0027] The fluorescent particles and a commercial blue-violet light chip with a bracket emitting wavelength of 400 nanometers are encapsulated with epoxy resin to obtain a white light diode. Figure 2 is the composition of Sr 3-a-b Ba a Si 1-c O 5 :bEu 2+ , CE, dF, eG (a=0.0, b=0.05, c=0.0, d=0.0, e=0.0) the excitation spectrum and emission spectrum of the phosphor. Figure 3 is a schematic diagram of the packaged white light diode structure. : The GaN-based semiconductor chip 1 is placed on the reflector cup 2, and the chip and the phosphor 3 are formed of transparent epoxy resin 4. E: The LED chip emits blue light, and F: The phosphor emits yellow-green light.

Example Embodiment

[0028] Example 2
[0029] According to the composition of the phosphor and the process flow of Figure 1, take a = 0.1, b = 0.1, c = 0.05, d = 0.0, c: e = 10:1, weigh the analytically pure strontium nitrate and barium nitrate, and their purity 99.9% SiO with an average size of 10 nanometers 2 And spectrally pure Ce with an average size of 50 nanometers 2 O 3 , Analytical pure lithium nitrate and spectrally pure europium nitrate are put into a beaker together. According to the solid:liquid volume ratio=1:15, add deionized water, mechanically stir, titrate with a 30% nitric acid aqueous solution to pH=2, and stir for 5 hours to obtain a composite silica sol. The composite silica sol is sprayed and granulated, and the compressed air temperature is set to an inlet temperature of 150°C, and the amount of dry air is 150m. 3/h, the material flow is 2L/h, and the dry gel particles are obtained; the dry gel particles are put into a corundum crucible and pre-fired in a common muffle furnace at a temperature of 700°C for 4 hours, and the pre-fired powder is obtained after natural cooling. Place the crucible containing the pre-fired powder in an industrial microwave oven, and first pass N with a flow rate of 2L/h 2 +5%H 2 (Volume ratio) The mixed gas is fired at 1300°C for 6 hours at a controlled temperature, then the power is turned off, and the spherical phosphor particles are obtained by cooling. The fluorescent particles and a commercial blue chip with a bracket emitting wavelength of 460 nanometers are encapsulated with epoxy resin to obtain a white light diode.

Example Embodiment

[0030] Example 3
[0031] According to the composition of the phosphor and the process flow of Figure 1, take a = 0.0, b = 0.0, c = 0.1, d = 0.0, c: e = 1: 0.05, and weigh the analytically pure strontium nitrate with a purity of 99.9% SiO with an average size of 10 nanometers 2 And spectrally pure Ce with an average size of 50 nanometers 2 O 3 Analyze pure lithium nitrate and put them into a beaker together. According to the solid:liquid volume ratio=1:20, add deionized water, mechanically stir, titrate with a 30% nitric acid aqueous solution to pH=3, and stir for 6 hours to obtain a composite silica sol. The composite silica sol is sprayed and granulated, and the compressed air temperature is set to 200℃ at the inlet temperature and the dry air volume is 200m 3 /h, the material flow is 1.5L/h, and the dry gel particles are obtained; the dry gel particles are put into a corundum crucible and pre-fired in a common muffle furnace at a temperature of 800°C for 6 hours. After natural cooling, the pre-fired powder is obtained . Place the crucible with pre-fired powder in an industrial microwave oven, and first pass in N with a flow rate of 3L/h 2 +5%H 2 (Volume ratio) After the mixed gas is fired at 1400°C for 12 hours, the power is turned off and cooled to obtain spherical phosphor particles. The fluorescent particles and a commercial blue chip with a bracket emitting wavelength of 460 nanometers are encapsulated with epoxy resin to obtain a white light diode.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Composite and Method of Preparing the Same

ActiveUS20180179347A1Process environmental protectionFibre disintegrationArtificial filament chemical after-treatmentYarnFiber
Owner:LOTTE ADVANCED MATERIALS CO LTD

Classification and recommendation of technical efficacy words

  • Easy to control
  • Process environmental protection

Ammonium nitrate and paraffinic material based gas generating propellants

InactiveUS6176950B1Minimizes ballistic variabilityProcess environmental protectionExplosive working-up apparatusNitrated acyclic/alicyclic/heterocyclic amine explosive compositionsParaffin waxNitric oxide
Owner:ADVANCED INFLATOR TECH L L C
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products