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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 problems affecting lumen efficiency and color reproduction performance, and achieve the effect of overcoming color imbalance

Active Publication Date: 2013-08-21
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

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preparation example Construction

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

[0027] a. Containing Ce oxides, carbonates, nitrates or halides, Eu oxides, carbonates, nitrates or halides, Sc oxides, carbonates, nitrates or halides, Mn The oxides, carbonates, nitrates or halides of Si, the oxides of Si and Ba, carbonates, nitrates or halides are raw materials, according to the chemical formula of each material in the above single-phase white light phosphor Measuring ratio, calculating and weighing the above-mentioned raw materials, grinding and mixing;

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

Embodiment 1

[0032] Preparation of Ba 9 sc 1.95 Ce 0.05 (SiO 4 ) 6 (i.e. 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 stoichiometric ratio 3 0.8880 g, Sc 2 o 3 0.0673 g, CeO 2 0.0043 g, SiO 2 0.1802 g, put it into an agate mortar and grind it fully, put the mixture into a corundum crucible, cover it, put it in a high temperature furnace, and put it in CO or H 2 Under a reducing atmosphere, heat to 1050-1350°C, keep the temperature constant for 2-4 hours, cool naturally and then grind to get the composition Ba 9 sc 1.95 Ce 0.05 (SiO 4 ) 6 of fluorescent powder.

[0034] figure 1 (a) gives the excitation spectrum of this phosphor (λ em =383nm) and emission spectrum (λ ex =330nm), it can be seen from the figure that Ce 3+ Ba alone activated 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 valu...

Embodiment 2

[0036] Preparation of Ba 8.95 Eu 0.05 sc 2 (SiO 4 ) 6 (i.e. 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 stoichiometric ratio 3 0.8831 g, Sc 2 o 3 0.0690 g, Eu 2 o 3 0.0044 g, SiO 2 0.1802 g, put it into an agate mortar and grind it fully, put the mixture into a corundum crucible, cover it, put it in a high temperature furnace, and put it in CO or H 2 Under a reducing atmosphere, heat to 1050-1350°C, keep the temperature constant for 2-4 hours, cool naturally and then grind to get the composition Ba 8.95 Eu 0.05 sc 2 (SiO 4 ) 6 of fluorescent powder.

[0038] figure 1 (b) gives the excitation spectrum of this phosphor (λ em =460nm, λ em =500nm) and emission spectrum (λ ex =330nm), it can be seen from the figure that Eu 2+ Ba alone activated 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 43...

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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 excitation by near-ultraviolet light and a preparation method thereof. Background technique [0002] White light-emitting diodes (abbreviated as white LEDs) have the advantages of high efficiency, energy saving, 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 they are also a research hotspot in the international lighting field. [0003] At present, white light LED is mainly realized through the conversion scheme of LED chip and phosphor powder. This includes two methods: one is the organic combination of blue LED chips and phosphor powder, coating phosphor powder on the blue LED chip, and the phosphor powder converts blue light into visible light within green and red, thereby synthesizing white light with part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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