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UV-near infrared quantum cutting phosphor and preparation method thereof

A quantum tailoring, near-infrared technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of human body injury, inconvenience to popularize civilian use, etc., to achieve the effect of easy popularization and application

Inactive Publication Date: 2013-07-31
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the phosphor powder in the patent application 201110351951.X is excited by 274nm ultraviolet light, which is harmful to the human body and is not easy to popularize for civilian use.

Method used

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  • UV-near infrared quantum cutting phosphor and preparation method thereof
  • UV-near infrared quantum cutting phosphor and preparation method thereof
  • UV-near infrared quantum cutting phosphor and preparation method thereof

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Experimental program
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Embodiment 1

[0027] Embodiment 1, rare earth ion Ce 3+ The doping effect on La(BO 2 ) 3 impact test

[0028] (1) After fully grinding lanthanum oxide and boric acid in an agate mortar (wherein the molar ratio of lanthanum element contained in lanthanum oxide to boric acid is 1:1), put it in a crucible under the reduction condition of C powder, first Pre-sintered at 500°C for 2 hours, and then sintered at 1100°C for 4 hours; the synthesized LaBO 3 The XRD patterns of the samples are compared with the standard cards. Such as figure 1 As shown, it can be seen from the figure that all the diffraction peaks can be indexed to LaBO 3 (LaBO 3 It is an orthorhombic crystal system, the space group is Pnma, and the unit cell parameters are Z=4), it can be known that doping does not change the crystal structure of the matrix by comparing the XRD spectra. On this basis, the doping experiment of rare earth ions was carried out.

[0029] (2) After fully grinding lanthanum oxide, cerium oxide a...

Embodiment 2

[0030] Embodiment 2, LaBO 3 : Ce 3+ , Yb 3+ Study on Luminescent Properties of Double-doped System

[0031] Using LaBO 3 As a substrate for the exploration of near-infrared luminescence, Ce 3+ The ion has broad-spectrum excitation and emission of d-f transition and effective sensitization effect, Yb 3+There are only two energy levels: 2 f 7 / 2 ground state and 2 f 5 / 2 Excited state, the significant excitation and emission wavelength is about 974nm, which requires the energy transfer of other ions to achieve photoconversion, here study Ce 3+ ions in matrix LaBO 3 The luminescence properties and Ce 3+ with Yb 3+ Fluorescence properties after co-doping.

[0032] (1)LaBO 3 : Ce 3+ Photoluminescent properties of materials

[0033] In order to better study Ce 3+ and Yb 3+ The luminescent properties of ion double doping, first study of single doped Ce 3+ Luminescent properties of ions.

[0034] figure 2 for LaBO 3 : Ce 3+ excitation and emission spectra. In thi...

Embodiment 3

[0049] Embodiment 3, fluorescent powder LaBO 3 :0.22e 3+ , 0.03Yb 3+ preparation of

[0050] Accurately weigh lanthanum oxide, cerium oxide, ytterbium oxide and boric acid and fully grind them in an agate mortar (wherein, the amount of rare earth oxides is based on the contained rare earth elements, lanthanum oxide contained in lanthanum oxide, cerium contained in cerium oxide The ratio of the sum of the amount of ytterbium contained in ytterbium oxide to the amount of boric acid is 1:1, and the ratio of the amount of cerium contained in cerium oxide to the amount of ytterbium contained in ytterbium oxide is 22:3. Put it into a crucible under the condition of C powder reduction, pre-sinter at 500°C for 3 hours, and then rise to 800°C for 6 hours to get the phosphor LaBO 3 :0.22Ce 3+ , 0.03Yb 3+ .

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Abstract

The invention discloses a UV-near infrared quantum cutting phosphor and preparation method thereof. The molecular formula of the quantum cutting phosphor is LaBO3: xCe3+, yYb3+, wherein, 0.01<=x<=0.3, 0.005<=y<=0.1. Under the reduction condition, the mixture of lanthana, cerium oxide, ytterbium oxide and boric acid are pre-sintered and sintered in order, and the UV-near infrared quantum cutting phosphor is obtained. The phosphor provide by the invention does not shine in the visible light range, and is used for the aspects of novel false proof technology as well as military and common safety, and the phosphor can be excited by 365nm ultraviolet light without damage for human body, and is convenient for popularization and application.

Description

technical field [0001] The invention relates to a special novel ultraviolet-near-infrared quantum tailoring fluorescent powder and a preparation method thereof, belonging to the technical field of fluorescent powder and its preparation. Background technique [0002] The luminescence of rare earth compounds is based on the transition of 4f electron shells of rare earth atoms or ions with unfilled 4f shells within f-f configurations or between f-d configurations, and there are about 30,000 observable lines in their spectra , They can emit electromagnetic radiation of various wavelengths from ultraviolet light, visible light to infrared light region, and the wavelength of emitted light that can be generated covers a range of 0.17-5.15nm. Therefore, the abundant energy levels of rare earth ions and the transition characteristics of 4f electrons make rare earths a huge treasure house of luminescence. Rare earth luminescent materials have narrow emission bands, high color purity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 荆西平邵黎明
Owner PEKING UNIV
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