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

[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.

[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.

[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.