White light LED (light-emitting diode) blue fluorescent powder, preparation method thereof and application

A blue fluorescent powder and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of weakened luminous intensity of fluorescent materials, difficult control of synthesis process, easy imbalance of component matching, etc., and achieve production The preparation process is energy-saving and environmentally friendly, inhibits the formation of impurity phases, and is easy to operate

Inactive Publication Date: 2017-08-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Ba 2 Lu 5 B 5 o 17 : Ce 3+ It is a highly efficient blue light-emitting phosphor with excellent luminescence performance, and Ba 2 Y 5 B 5 o 17 : Ce 3+ have the same structure (as attached figure 1 shown), but due to the difficulty in controlling the synthesis process due to the easy imbalance of component matching, so far no one has obtained its stable pure phase, and at the same time, due to the generation of impurity phases, the Ce 3+ The absorption of the fluorescent material greatly weakens the luminous intensity of the fluorescent material, and more impurity phases even change the excitation and emission spectra.

Method used

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  • White light LED (light-emitting diode) blue fluorescent powder, preparation method thereof and application
  • White light LED (light-emitting diode) blue fluorescent powder, preparation method thereof and application
  • White light LED (light-emitting diode) blue fluorescent powder, preparation method thereof and application

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preparation example Construction

[0041] The preparation method of blue fluorescent powder for white light LED of the present invention, concrete steps are as follows:

[0042] (1) According to the chemical formula Ba 2-m A m Lu 5-x-n L n Ce x B 5 o 17 The stoichiometric ratio of each element in the 2+ Compounds containing Ca 2+ Compounds containing Sr 2+ Compounds containing Sc 3+ Compounds containing Lu 3+ Compounds containing Ce 3+ compounds containing Y 3+ Compounds containing La 3+ Compounds containing Gd 3+ Compounds containing Yb 3+ Compounds containing Er 3+ compounds and those containing B 3+ compound, ground in an agate mortar and mixed well to obtain a mixture;

[0043] In step (1), preferably, containing Ba 2+ , Ca 2+ 、Sr 2+ The compound is one or more of oxides, carbonates, nitrates and halides containing corresponding ions; containing Lu 3+ , Y 3+ 、Ce 3+ , La 3+ 、Gd 3+ 、Sc 3+ , Yb 3+ 、Er 3+ The compound is one or more of oxides, carbonates, nitrates and halides contain...

Embodiment 1

[0050] Ba 2 Lu 4.99 Ce 0.01 B 5 o 17 preparation of

[0051] Weigh BaCO according to stoichiometric ratio 3 : 0.3947 g, H 3 BO 3 : 0.3092 g, Lu 2 o 3 : 0.9928 g, CeO 2 : 0.0017 g. Grind and mix evenly in an agate mortar, put it into a corundum crucible, cover it, place it in a high-temperature furnace, pre-sinter at 400°C for 8 hours, take it out after cooling, and grind it for several minutes. Next, in carbon monoxide CO or hydrogen H 2 Under reducing atmosphere, sinter at 1100°C for 20 hours, after natural cooling, properly grind to obtain phosphor powder Ba 2 Lu 4.99 Ce 0.01 B 5 o 17 . Its crystal structure is similar to Example 3, but the excitation and emission intensity is weaker than that of Example 3.

Embodiment 2

[0053] Ba 1.9 Ca 0.1 Lu 4.98 Ce 0.02 B 5 o 17 preparation of

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Abstract

The invention relates to white light LED (light-emitting diode) blue fluorescent powder, a preparation method thereof and an application, belongs to the technical field of light-emitting materials, and solves the technical problems that Ba2Lu5B5O17:Ce3+ crystal-phase structures are unstable, synthetic process conditions are not easily controlled, heat stability is poor, and light-emitting efficiency is low in the prior art. The chemical formula of the fluorescent powder is Ba2-mAmLu5-x-nLnCexB5O17, wherein A refers to one of Ca and Sr, L refers to one or more of Y, La, Gd, Sc, Yb and Er, and x, m and n are mole fractions and have the value ranges of 0<x</=0.6, 0</=m</=1 and 0</=n</=2. The prepared fluorescent powder can be effectively excited by 200-380nm ultraviolet light and near ultraviolet light, is high in quantum efficiency, excellent in heat stability, simple and flexible in process and good in repeatability, and can be potentially applied to ultraviolet/near ultraviolet LEDs and chip base white LEDs.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a blue fluorescent powder for white LEDs and a preparation method and application thereof. Background technique [0002] In recent years, with the global rise of the semiconductor lighting business of light-emitting diodes (LEDs), white LEDs and various colored LEDs have attracted great attention as a new generation of light sources. Compared with traditional incandescent lamps and fluorescent lamps, this fourth-generation lighting source has many advantages such as durability, no pollution, stable performance, short response time, and high efficiency. [0003] At present, the main solution to realize white LED is to use phosphor conversion technology. The most mature approach is blue LED + yellow phosphor (or red / green phosphor) that can be efficiently excited by blue LED. Due to the high current of the blue light chip, the luminous intensity of the blue light sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/778H01L33/502H01L2933/0041Y02B20/00
Inventor 张家骅肖宇张霞郝振东张亮亮潘国徽肖文戈
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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