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Bismuth and europium ion codoped tungstate fluorescent ceramic powder and preparation method thereof

A technology of fluorescent ceramics and europium ions, which is applied in the field of ceramic phosphors, can solve the problems of low color rendering, complexity, and high cost of preparation methods, and achieve the effects of high-efficiency response characteristics and wide luminous color gamut

Inactive Publication Date: 2013-04-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the existing LED lighting phosphors, such as narrow visible light luminescent color gamut, low color rendering, the need for compounding of various phosphors, and high cost and complicated preparation methods. The present invention provides a bismuth and europium ion co- Doped tungstate fluorescent ceramic powder and preparation method thereof

Method used

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  • Bismuth and europium ion codoped tungstate fluorescent ceramic powder and preparation method thereof

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Effect test

Embodiment 1

[0013] (1) According to the molar ratio of Ca:W:Eu:Bi=1:1:0.002:0.005, weigh CaCO 3 、WO 3 、 Bi 2 o 3 and Eu 2 o 3 , and then mix well;

[0014] (2) Put the mixture obtained in step (1) in a corundum crucible, pre-calcine in the air at 1100°C for 5 hours, and wait for natural cooling to obtain tungstate fluorescent ceramic powder CaWO co-doped with bismuth and europium ions 4 : 0.002Eu: 0.005Bi.

Embodiment 2

[0016] (1) According to the molar ratio of Mg:W:Eu:Bi=1:1:0.0005:0.0005, weigh MgCO 3 、WO 3 、 Bi 2 o 3 and Eu 2 o 3 , and then mix well;

[0017] (2) Put the mixture obtained in step (1) in a corundum crucible, pre-calcine in air at 800°C for 5 hours, and wait for natural cooling to obtain tungstate fluorescent ceramic powder MgWO co-doped with bismuth and europium ions 4 : 0.0005Eu: 0.0005Bi.

Embodiment 3

[0019] (1) According to the molar ratio of Ba:W:Eu:Bi=1:1:0.0008:0.01, weigh BaCO 3 、WO 3 、 Bi 2 o 3 and Eu 2 o 3 , and then mix well;

[0020] (2) Put the mixture obtained in step (1) in a corundum crucible, pre-calcine in the air at 1300 ° C for 3 hours, and wait for natural cooling to obtain tungstate fluorescent ceramic powder BaWO co-doped with bismuth and europium ions 4 : 0.0008Eu: 0.01Bi.

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Abstract

The invention provides bismuth and europium ion codoped tungstate fluorescent ceramic powder and a preparation method thereof. The powder comprises MWO4, Eu and Bi at a mole ratio of 1:(0.0005-0.1):(0.0005-0.1), wherein M is one of Mg, Ca, Sr and Ba. MCO3, WO3, Bi2O3 and Eu2O3 are weighed according to the mole ratio, and then mixed uniformly; an obtained mixture is subjected to previous calcining in air at 800-1300 DEG C for 1-5h, and cooled naturally; and the bismuth and europium ion codoped tungstate fluorescent ceramic powder is obtained. The powder has a high-efficiency response characteristic to ultraviolet light excitation, and can emit white light under the ultraviolet light excitation; a luminous color gamut is wide under the ultraviolet light excitation; proportioning of various fluorescent powder is not required; sintering in a reducing atmosphere is not required; and no color temperature drift appears.

Description

technical field [0001] The invention belongs to the display and lighting fluorescent powder technology, and in particular relates to a ceramic fluorescent powder with a display lighting function under the excitation of ultraviolet light. Background technique [0002] White LED is a new type of solid-state lighting energy. It is considered to be a new energy that may replace traditional lighting sources in the 21st century due to its advantages of energy saving, long service life, low energy consumption, no pollution, and high efficiency. At present, there are two main ways to obtain white light LEDs: one is the multi-chip combination type, which combines LEDs that emit red, green, and blue light respectively, and mixes the three kinds of light to form white light emission. The white light of this scheme has the advantages of high brightness, good stability, and good color rendering; however, the cost is high, the driving circuit is complicated, and there is no large-scale pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
CPCY02B20/00
Inventor 杨正文邱建备熊亚琼宋志国于雪杨勇周大成尹兆益
Owner KUNMING UNIV OF SCI & TECH
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