Terbium ion doped yttrium phosphate barium green phosphor and preparation method thereof

A green fluorescent powder, yttrium barium phosphate technology, applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of low color rendering index, insufficient color temperature, etc., and achieve the effects of high luminous intensity, pure chromaticity, and simple preparation process

Inactive Publication Date: 2015-05-13
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of fluorescent powder excited by ultraviolet light or near ultraviolet light, with high luminous efficiency and simple preparation method, aiming at the disadvantages of low color rendering index and insufficient color temperature in existing YAG:Ce3+ yellow-emitting phosphors in white LEDs. And environment-friendly yttrium barium phosphate-based green fluorescent powder and preparation method thereof

Method used

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  • Terbium ion doped yttrium phosphate barium green phosphor and preparation method thereof
  • Terbium ion doped yttrium phosphate barium green phosphor and preparation method thereof
  • Terbium ion doped yttrium phosphate barium green phosphor and preparation method thereof

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Embodiment 1

[0019] Mix 3 mol of barium carbonate, 0.48 mol of yttrium oxide, 0.01 mol of tetraterbium heptoxide, and 3 mol of ammonium dihydrogen phosphate, and grind them evenly to obtain a mixture; heat the mixture to 300°C for 1.5 hours in an air atmosphere , naturally cooled and ground to obtain calcined material; the calcined material was heated to 1150 ° C for 10 hours in an air atmosphere, naturally cooled and ground evenly, and the chemical composition was obtained as Ba 3 Y 0.96 Tb 0.04 (PO 4 ) 3 green phosphor.

[0020] The X-ray powder diffraction pattern of the green phosphor material sample prepared in this embodiment is shown in the attached figure 1 . The absorption spectra of the material samples are shown in the attached figure 2 . The luminescence spectrum of the material sample under the excitation of 378nm wavelength is shown in the attached image 3 . From attached figure 2 And attached image 3 It can be seen that the Ba prepared in this example 3 Y 0...

Embodiment 2

[0022] Mix 3 mol of barium nitrate, 0.485 mol of yttrium oxide, 0.015 mol of terbium trioxide, and 3 mol of diammonium hydrogen phosphate, and grind them evenly to obtain a mixture; heat the mixture to 400°C for 2 hours in an air atmosphere , after natural cooling and grinding, the calcined material is obtained; the calcined material is heated to 1250 ° C for 8 hours in an air atmosphere, naturally cooled and ground evenly, and the chemical composition is obtained as Ba 3 Y 0.97 Tb 0.03 (PO 4 ) 3 green phosphor. The phosphor has bright green luminescence under ultraviolet light irradiation.

Embodiment 3

[0024] Mix 3 mol of barium carbonate, 0.9 mol of yttrium nitrate, 0.1 mol of terbium dioxide, and 3 mol of ammonium phosphate, and grind them evenly to obtain a mixture; the mixture is heated to 450°C for 4 hours in an air atmosphere, and then cooled naturally 1. After grinding, the calcined material is obtained; the calcined material is heated to 1350 ° C for 16 hours in an air atmosphere, cooled naturally, and ground to obtain a chemical composition of Ba 3 Y 0.9 Tb 0.1 (PO 4 ) 3 green phosphor. The phosphor has bright green luminescence under ultraviolet light irradiation.

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Abstract

The invention discloses terbium ion doped yttrium phosphate barium green phosphor and a preparation method thereof. The chemical constitution of the green phosphor is Ba3Y(1-x)Tbx (PO4)3, wherein x is between 0.001 to 0.2, the phosphor is prepared by adopting high-temperature solid-phase method which comprises the following steps of firstly weighing a compound containing Ba<2+>, a compound containing Y<3+>, a compound containing terbium ions and a compound containing P<5+> respectively according to the stoichiometric ratio of each element in the chemical formula of the phosphor, grinding and mixing the compounds, presintering the obtained mixture at 300-500 DEG C for 0.5-4 hours, cooling, then sintering the mixture at 1,150-1,350 DEG C for 4-16 hours, and cooling. The green phosphor can be effectively activated by near ultraviolet or ultraviolet light and can emit green light with a main peak wavelength of 542 nanometers, the light-emitting intensity is high, the chroma is pure, good heat stability can be provided, no waste water or waste gas is discharged according to the preparation method, and the preparation method is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a terbium ion-doped yttrium barium phosphate green fluorescent powder and a preparation method thereof. Background technique [0002] White light-emitting diode (LED) is called the fourth generation of lighting source. As a new generation of solid light source, in addition to overcoming the shortcomings of traditional incandescent and fluorescent lamps such as high energy consumption, fragility, and pollution, it also has small size and environmental protection. , fast response, long life, planar packaging, high luminous intensity, high efficiency, energy saving, vibration resistance and low voltage drive. Especially in recent years, with the rapid development of blue, purple and ultraviolet LEDs, white LEDs have great application prospects in the field of lighting, and are recognized as green lighting sources that replace fluorescent lamps and incandesce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 赵营刚石冬梅白晓华
Owner LUOYANG INST OF SCI & TECH
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