A kind of cerium, terbium co-doped borate fluorescent powder and preparation method thereof

A phosphor, borate technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problems of low luminous efficiency, poor thermal stability, difficult synthesis process conditions, etc., achieve good thermal stability, improve Thermal stability, the effect of extending the excitation range

Active Publication Date: 2018-09-21
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of blue and green fluorescent powders in the prior art that the synthesis process conditions are not easy to control, poor thermal stability, and low luminous efficiency, and provides a borate fluorescent powder co-doped with cerium and terbium and its preparation method

Method used

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  • A kind of cerium, terbium co-doped borate fluorescent powder and preparation method thereof
  • A kind of cerium, terbium co-doped borate fluorescent powder and preparation method thereof
  • A kind of cerium, terbium co-doped borate fluorescent powder and preparation method thereof

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preparation example Construction

[0038] The specific steps of the preparation method of the borate fluorescent powder co-doped with cerium and terbium provided by the invention are as follows:

[0039] (1) According to the chemical formula Ba 2-n Sr n Y 5-x-y-m L m Ce x Tb y B 5 o 17 The stoichiometric ratio of each element in the 2+ compounds containing Y 3+ Compounds containing Ce 3+ Compounds containing Tb 3+ compounds containing B 3+ Compounds containing Sr 2+ Compounds containing La 3+ Compounds containing Gd 3+ Compounds containing Lu 3+ Compounds, and compounds containing Sc 3+ compound, ground in an agate mortar and mixed well to obtain a mixture;

[0040] (2) The above mixture is pre-sintered at 350°C to 600°C in a reducing gas atmosphere or in air, and the sintering time is 1 to 6 hours; it is heated to a sintering temperature of 1000°C to 1300°C in a reducing gas atmosphere, and the sintering time is After 2-24 hours, the sintered product is naturally cooled, and then ground to obt...

Embodiment 1

[0046] Embodiment 1 (comparative example)

[0047] Ba 2 Y 4.95 Ce 0.05 B 5 o 17 preparation of

[0048] Weigh BaCO according to stoichiometric ratio 3 : 0.3947 g, H 3 BO 3 : 0.3092 g, Y 2 o 3 : 0.5589 g, CeO 2 : 0.0086 g. Grind and mix evenly in an agate mortar, put it into a corundum crucible, cover it, place it in a high-temperature furnace, and carry out pre-sintering at 450°C under a reducing atmosphere or in air, and the sintering time is 4 hours. h 2 Under reducing atmosphere, heat up to 1200°C and sinter for 10 hours. After natural cooling, properly grind to obtain phosphor powder Ba 2 Y 4.95 Ce 0.05 B 5 o 17 . Its crystal structure is similar to embodiment 4, and the excitation spectrum of the present embodiment is shown in the attached Figure 4 (a), with image 3 Curve 1 is the emission spectrum of the present embodiment, with Figure 5 Data point 1 is the chromaticity coordinate of this example.

Embodiment 2

[0050] Ba 2 Y 4.65 Ce 0.05 Tb 0.3 B 5 o 17 preparation of

[0051] Weigh BaCO according to stoichiometric ratio 3 : 0.3947 g, H 3 BO 3 : 0.3092 g, Y 2 o 3 : 0.5250 g, CeO 2 : 0.0086 g, Tb 4 o 7 : 0.0561 g. Grind and mix evenly in an agate mortar, put it into a corundum crucible, cover it, place it in a high-temperature furnace, and carry out pre-sintering at 450°C under a reducing atmosphere or in air, and the sintering time is 4 hours. h 2 Under reducing atmosphere, heat up to 1200°C and sinter for 10 hours. After natural cooling, properly grind to obtain phosphor powder Ba 2 Y 4.65 Ce 0.05 Tb 0.3 B 5 o 17 . Its crystal structure, excitation spectrum are similar to embodiment 4, appended image 3 Curve 2 is the emission spectrum of the present embodiment, with Figure 5 Data point 2 is the chromaticity coordinate of this example.

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Abstract

The invention relates to a borate fluorescent powder co-doped with cerium and terbium and a preparation method thereof, belonging to the field of luminescent materials. The chemical general formula of described fluorescent powder is: Ba2-nSrnY5-x-y-mLmCexTbyB5O17, wherein, L is one or more in Gd, La, Lu and Sc; Said x, n, m, y are mole Score, its value range is: 0

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a borate fluorescent powder co-doped with cerium and terbium and a preparation method thereof. Background technique [0002] White light-emitting diodes (white light-emitting diodes, WLEDs) have broad application prospects in the field of lighting and display due to their long life, low energy consumption, no pollution, high efficiency and small size, and are called the new generation of lighting. light source. [0003] At present, the main solution to realize white LED is phosphor conversion technology, which has two implementation methods: (1) blue LED + yellow phosphor (or red / green phosphor) that can be effectively excited by blue LED. In this method, because the blue light of the LED directly participates in the synthesis of white light, the color of the device changes with the coating thickness of the phosphor powder and the driving voltage, and the color r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/778H01L33/502H01L2933/0041
Inventor 张家骅肖宇张霞郝振东潘国徽肖文戈
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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