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Fluorescent material and preparation method thereof

A fluorescent material and excitation spectrum technology, applied in the field of photoelectric conversion materials, can solve problems such as structural instability and lattice mismatch, and achieve the effects of unique design ideas, stable structure, and easy availability of raw materials

Inactive Publication Date: 2012-03-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, light emission by doping ions will also be accompanied by a series of problems such as lattice mismatch and structural instability caused by charge imbalance.

Method used

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  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material Eu 2 o 3 , Nb 2 o 5 、K 2 CO 3 According to EuK 2 Nb 5 o 15 The stoichiometric ratio was weighed. Use ball milling to make the mixture fine and fully mixed. Then the ball-milled mixture was put into a corundum crucible and pre-fired in a furnace at a temperature of 1000 °C for 12 h. The pre-calcined powder was ground and fired again at 1300 °C for 12 h. The phosphor powder prepared by firing is ball-milled, refined and sieved to obtain a pure-phase fluorescent material. The XRD pattern analysis of the prepared fluorescent material sample shows that its crystal structure is the same as that of tungsten bronze, which is a single crystal phase. Through UV-Vis absorption spectrum analysis, excitation spectrum analysis and emission spectrum analysis on the fluorescent material samples, it can be seen that the excitation spectrum of the prepared fluorescent material has an ultra-wide excitation band of 270-450nm, and the fluorescent material has a g...

Embodiment 2

[0032] The raw material Eu 2 o 3 , Nb 2 o 5 、K 2 CO 3 According to EuK 2 Nb 5 o 15 The stoichiometric ratio was weighed. Use ball milling to make the mixture fine and fully mixed. Then the ball-milled mixture was put into a corundum crucible and pre-fired in a furnace at a temperature of 500 °C for 48 h. The pre-calcined powder was ground and fired again at 1500 °C for 12 h. The phosphor powder prepared by firing is ball-milled, refined and sieved to obtain a pure-phase fluorescent material.

Embodiment 3

[0034] The raw material Eu 2 o 3 , Nb 2 o 5 、K 2 CO 3 According to EuK 2 Nb 5 o 15 The stoichiometric ratio was weighed. Use ball milling to make the mixture fine and fully mixed. Then the ball-milled mixture was put into a corundum crucible and fired in a furnace at a firing temperature of 1000°C for a firing time of 96 hours. The phosphor powder prepared by firing is ball-milled, refined and sieved to obtain a pure-phase fluorescent material.

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Abstract

The invention relates to fluorescent material and a preparation method thereof. The fluorescent material is a compound adopting a tungsten bronze structure; the chemical expression of the fluorescent material is LnA2M5O15, wherein, Ln is one of Ce, Sm, Eu, Gd and Tb; A is one or a combination containing more than two elements of Li, Na, K, Pb and Cs; and M is one or the combination containing more than two elements of Nb and Ta. The fluorescent material adopts the tungsten bronze structure, achieves good stability and large ion coordination number, and facilitates the improvement on the luminescent property. The fluorescent material and the preparation method thereof adopt intrinsic photoluminescence, that is, extra excited ions and / or luminous ions do not need to be doped.

Description

technical field [0001] The invention relates to a photoelectric conversion material that can be used to convert ultraviolet light or blue light emitted by white LEDs, ordinary incandescent lamps, etc. into visible light, such as red light, and belongs to the field of fluorescent materials. Background technique [0002] Solid State Lighting (Solid State Lighting, SSL) refers to the technology of using semiconductor light emitting diode (Light Emitting Diode, LED) or the combination of semiconductor light emitting diode and phosphor to generate white light as a general lighting source. Different from vacuum tube incandescent lamps and mercury-filled fluorescent lamps, it is a new lighting technology with a series of advantages such as low calorific value, low energy consumption, long life, small size, fast response speed, and no environmental pollution. It is closest to sunlight and can better reflect the true color of the irradiated object. Its market application prospect is ...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 黄富强殷鑫
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI