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Single-phase white light phosphor for near-ultraviolet light excitation and preparation method thereof

A near-ultraviolet light and phosphor technology, applied in the field of luminescence, can solve the problems affecting lumen efficiency and color reproduction performance, and achieve the effect of overcoming color imbalance

Active Publication Date: 2012-10-17
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of reabsorption and ratio control of the three primary color phosphors in the prior art, which affect the lumen efficiency and color reproduction performance, the present invention provides a single-phase white phosphor suitable for excitation by near-ultraviolet light and its preparation method

Method used

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  • Single-phase white light phosphor for near-ultraviolet light excitation and preparation method thereof
  • Single-phase white light phosphor for near-ultraviolet light excitation and preparation method thereof

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preparation example Construction

[0026] The preparation method of the single-phase white light phosphor of the present invention includes the following steps:

[0027] a. To contain Ce oxide, carbonate, nitrate or halide, Eu oxide, carbonate, nitrate or halide, Sc oxide, carbonate, nitrate or halide, Mn Oxides, carbonates, nitrates or halides, Si oxides and Ba oxides, carbonates, nitrates or halides as raw materials, according to the chemical formula of the single-phase white phosphor Metering ratio, calculate and weigh the above raw materials, and grind and mix;

[0028] b. Put the above mixture into a corundum crucible, put it into a high temperature furnace, and place it in CO or H 2 It is calcined under reducing conditions, the calcining temperature is 1050 DEG C.-1350 DEG C, the firing time is 2-4 hours, and the single-phase white phosphor can be obtained by grinding after natural cooling.

Embodiment 1

[0032] Preparation of Ba 9 Sc 1.95 Ce 0.05 (SiO 4 ) 6 (Ie Ba 9-x-y Eu x Mn y Sc 2-z Ce z (SiO 4 ) 6 In, when x=0, y=0, z=0.05) phosphor.

[0033] Weigh BaCO according to the stoichiometric ratio 3 0.8880 g, Sc 2 O 3 0.0673 g, CeO 2 0.0043 g, SiO 2 0.1802g, put it in an agate mortar, fully grind and mix, put the mixture in a corundum crucible, cover it, place it in a high-temperature furnace, and place it in CO or H 2 In a reducing atmosphere, heat to 1050-1350°C, keep constant temperature for 2-4 hours, cool naturally and grind to obtain the composition Ba 9 Sc 1.95 Ce 0.05 (SiO 4 ) 6 Of phosphors.

[0034] figure 1 (A) The excitation spectrum of the phosphor (λ em =383nm) and emission spectrum (λ ex =330nm), it can be seen from the figure that Ce 3+ Individually activated Ba 9 Sc 2 (SiO 4 ) 6 Under the excitation of 280-350nm ultraviolet light, the phosphor emits blue-violet light with a wavelength range of 360-440nm and a peak value of 383nm, and the emission is very strong.

Embodiment 2

[0036] Preparation of Ba 8.95 Eu 0.05 Sc 2 (SiO 4 ) 6 (Ie Ba 9-x-y Eu x Mn y Sc 2-z Ce z (SiO 4 ) 6 In, when x=0.05, y=0.00, z=0.00) phosphor.

[0037] Weigh BaCO according to the stoichiometric ratio 3 0.8831 g, Sc 2 O 3 0.0690 g, Eu 2 O 3 0.0044 g, SiO 2 0.1802g, put it in an agate mortar, fully grind and mix, put the mixture in a corundum crucible, cover it, place it in a high-temperature furnace, and place it in CO or H 2 Under reducing atmosphere, heat to 1050-1350°C, keep constant temperature for 2-4 hours, cool naturally and grind, then the composition is Ba 8.95 Eu 0.05 Sc 2 (SiO 4 ) 6 Of phosphors.

[0038] figure 1 (B) The excitation spectrum of the phosphor (λ em =460nm, λ em =500nm) and emission spectrum (λ ex =330nm), as can be seen from the figure, Eu 2+ Individually activated Ba 9 Sc 2 (SiO 4 ) 6 Under the excitation of 300-450nm ultraviolet light, the phosphor emits blue-green light with a wavelength range of 430-550nm and peaks of 460nm and 500nm, and the emissi...

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Abstract

The invention discloses single-phase white light phosphor for near-ultraviolet light excitation and a preparation method thereof, relating to the technical field of luminescence. The phosphor is represented by the chemical formula: Ba9-x-yEuxMnySc2-zCez(SiO4)6, wherein x is no less than 0.03 and no larger than 0.20, y is no less than 0.05 and no larger than 0.30, and z is no less than 0.02 and nolarger than 0.15. The preparation method of the phosphor comprises the following steps: using oxides, carbonates, nitrates or halides which contain Ce, Eu, Sc, Mn, Si and Ba as raw materials, mixing and grinding, then roasting at 1050-1350 DEG C for 2-4 h, cooling naturally, and then grinding to obtain the phosphor. By combining the single-phase white light phosphor with a near-ultraviolet light chip to prepare white light LED, the problems of color discrepancies caused by multiphase mixing and luminous efficiency and color reductibility influenced by reabsorption and proportion regulating problem of trichromatic phosphor are solved.

Description

Technical field [0001] The invention relates to the field of luminescence technology, in particular to a single-phase white light phosphor suitable for near-ultraviolet light excitation and a preparation method thereof. Background technique [0002] White light-emitting diodes (abbreviated as white LED) have the advantages of high efficiency, energy saving, green environmental protection, small size, long life, and good shock resistance. They are considered to be a new light source to replace traditional lighting devices and are also a hot spot in the international lighting field. [0003] At present, white LEDs are mainly realized through the conversion of LED chips and phosphors. This includes two methods: one is the organic combination of blue LED chips and phosphors. The blue LED chips are coated with phosphors. The phosphors convert blue light into visible light within green and red, thereby synthesizing white light with part of the blue light that passes through. . The most...

Claims

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Application Information

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IPC IPC(8): C09K11/79
CPCY02B20/181Y02B20/00
Inventor 张霞张家骅郝振东
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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