Single-substrate single-doping lanthanum aluminate full-color adjustable fluorinite and production method thereof
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A phosphor, lanthanum aluminate technology, used in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problem of low color rendering of white light, inconsistent light decay and efficiency of absorption, excitation and emission spectra, and weak fluorescence And other issues
Inactive Publication Date: 2009-04-08
TIANJIN UNIVERSITY OF TECHNOLOGY
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Obviously, such a multi-component mixed phosphor and device has a series of obvious disadvantages: the refractive index of the micron-scale phosphor particles of each color is inconsistent, resulting in the attenuation of photon energy propagation between different lattices; the absorption of phosphors of various colors, The excitation and emission spectra, light attenuation and efficiency are inconsistent, and there is a problem of reabsorption energy dissipation; the color mixing material is not easy to be uniform, and the luminous color of the diode drifts with the change of the driving voltage and the thickness of the phosphor coating, and the temperature rise causes color drift and heat deterioration, it is not easy to obtain a stable luminous color; the existing sulfide red powder is unstable, and it is difficult to meet the req
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Embodiment 1
[0029] According to the chemical formula of the phosphor La 1-a AlO 3 :Eu a , Li + b (a=0.02, b=0.00), the weighed raw materials (3.1933gLa 2 o 3 , 1.0196gAl 2 o 3 , 0.0704gEu 2 o 3 ) was dissolved in alcohol to form a slurry; the slurry was oscillated in an ultrasonic wave for 10 minutes and then dried at 50°C. The resulting powder was in H 2 The ratio is 8% N 2 +H 2 Burn in a horizontal tube furnace at 1400°C for 4 hours in a mixed reducing atmosphere. attached figure 1 Be the X-ray diffraction figure of embodiment 1 product in the middle, appendix figure 2 is the emission spectrum and its excitation spectrum under the excitation of 310 nm wavelength light.
Embodiment 2
[0031] According to the chemical formula of the phosphor La 1-a AlO 3 :Eu a , Li + b (a=0.02, 0.04, 0.06, 0.08, 0.10, b=0.00), the weighed raw materials (a=-0.02, 3.1933gLa 2 o 3 , 1.0196gAl 2 o 3 , 0.0704gEu 2 o 3 ; a=0.04, 3.1282gLa 2 o 3 , 1.0196gAl 2 o 3 , 0.1408gEu 2 o 3 ; a=0.06, 3.0630gLa 2 o 3 , 1.0196gAl 2 o 3 , 0.2112gEu 2 o 3 ; a=0.08, 2.9978gLa 2 o 3 , 1.0196gAl 2 o 3 , 2816gEu 2 o 3 ; a=0.10, 2.9327gLa 2 o 3 , 1.0196gAl 2 o 3 , 0.3520gEu 2 o 3 ;) was dissolved in alcohol to form a serum; the serum was oscillated in an ultrasonic wave for 30 minutes and then dried at 70 degrees. The resulting powder was in H 2 The ratio is 8% N 2 +H 2 Burn in a horizontal tube furnace at 1400°C for 4 hours in a mixed reducing atmosphere. image 3 is the emission spectrum of Example 2.
Embodiment 3
[0033] According to the chemical formula of the phosphor La 1-a AlO 3 :Eu a , Li + b (a=0.04, b=0.00), the weighed raw material (3.1282gLa 2 o 3 , 1.0196g Al 2 o 3 , 0.1408gEu 2 o 3 ) was dissolved in alcohol to form a slurry; the slurry was oscillated in an ultrasonic wave for 50 minutes and then dried at 90°C. The resulting powder was in H 2 The ratio is 8% N 2 +H 2 Burn in a horizontal tube furnace at 1500°C, 1400°C, 1300°C, and 1200°C for 4 hours in a mixed reducing atmosphere. attached Figure 4 are the emission spectra at different firing temperatures.
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Abstract
The invention provides a full-color phosphor of a single substrate single mixed lanthanum aluminate base with adjustable colors as well as a manufacture method. The invention belongs to the technical fields of photoelectric materials and apparatuses. The chemical formula of the phosphor is La1-aAlO3:Eua,Li<+>b, wherein, accounted by molal quantity, a is equal to or more than 0.02 and equal to or less than 0.2; b is equal to or more than 0.00 and equal to or less than 0.4; under the excitation of lights with wavelengths of 250nm to 400nm, the phosphor can simultaneously have three emission areas which include the blue lights the emission wavelengths of which are 440nm, the green lights the emission wavelengths of which are 515nm and the red lights the emission wavelengths of which are 592 and 618nm for composing the white light. The manufacture process is as follows: the weighed materials are dissolved into alcohol for forming serum and manufactured into powder through ultrasonic surging and drying; then the mixed gas of N2 and H2 is used as the reduction atmosphere for obtaining the phosphor under high temperature ignition. The spectrum characteristics of the phosphor can be effectively adjusted through adjusting the preparation technical conditions which include the ignition time, the ignition temperature, the reduction atmosphere and the adding concentration of a charge compensation agent of Li<+>. The full-color phosphor can be used for the white light apparatuses of a white light LED, a fluorescent lamp, and the like.
Description
【Technical field】: [0001] The invention belongs to the technical field of optoelectronic materials and devices, and in particular relates to a single-substrate single-doped full-color adjustable phosphor excited by near-ultraviolet light, and a method for realizing color control by changing the preparation process and co-doping ions. 【Background technique】: [0002] The broad meaning of "panchromatic" white light should have a continuous spectrum of visible light, not only the color coordinates should fall in the white light area, but also close to the black body orbital line, so that it has a high color rendering, such as sunlight, while artificial "white light" According to the principle of three-primary color matching, it is also possible to mix highly discontinuous light of specific color wavelengths, such as double light, three light or multi-spectrum, into high color rendering white light in proportion. In fact, the existing GaN / YAG:Ce 3+ And tricolor fluorescent lamps...
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