Single-substrate single-doping lanthanum aluminate full-color adjustable fluorinite and production method thereof

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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Problems solved by technology

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 requirements of high-performance red light components for white light color matching

However, since Mn 2+ The transitions of Mn are spin-forbidden and parity-forbidden d-d transitions, and the absorption of ultraviolet light is very weak, which leads to the weak fluorescence directly excited. Therefore, the energy of the red light emission of Mn ions comes from the blue light of co-doped Eu ions Energy transfer in the luminescent center

In this way, the consensus gradually formed in the industry believes that the color rendering of this dual-band photosynthetic white light is not high, due to the result of Eu-Mn lattice resonance energy transfer and relaxation, resulting in reduced luminous efficiency, and only relying on Mn ions to emit red The low efficiency of light has always been a difficult problem for luminescent materials to solve

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