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Rare-earth white light emitting material for dysprosium excited mercury-free fluorescent lamp and its preparing method

A technology for luminescent materials and fluorescent lamps, applied in luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., can solve problems such as mercury pollution in fluorescent lamps, achieve good color purity, develop utilization methods, and reduce production costs.

Inactive Publication Date: 2009-06-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of mercury pollution in existing fluorescent lamps, and provide a rare earth white light luminescent material that can emit white light and have good color purity under the condition of no mercury excitation

Method used

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  • Rare-earth white light emitting material for dysprosium excited mercury-free fluorescent lamp and its preparing method
  • Rare-earth white light emitting material for dysprosium excited mercury-free fluorescent lamp and its preparing method
  • Rare-earth white light emitting material for dysprosium excited mercury-free fluorescent lamp and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 )0.79g, calcium carbonate (CaCO 3 ) 0.48g, barium nitrate (Ba(NO 3 ) 2 )1.25g, ammonium fluoride (NH 4 F) 0.08g, Dysprosium trioxide (Dy 2 O 3 )0.03g, sodium carbonate (Na 2 CO 3 ) 0.01g, after being fully ground in an agate mortar and evenly mixed, sintered in air at 1200°C for 1 hour, cooled to room temperature, the sample is taken out, ground, washed, and dried to obtain the final product.

Embodiment 2

[0016] Weigh diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 )0.79g, calcium carbonate (CaCO 3 ) 0.46g, barium nitrate (Ba(NO 3 ) 2 ) 1.20g, ammonium fluoride (NH 4 F) 0.08g, Dysprosium trioxide (Dy 2 O 3 )0.06g, potassium carbonate (K 2 CO 3 ) 0.028g, after being fully ground in an agate mortar and evenly mixed, sintered in air at a temperature of 1100°C for 2 hours, cooled to room temperature, the sample is taken out, ground, washed, and dried to obtain the final product.

Embodiment 3

[0018] Weigh diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 )0.79g, calcium carbonate (CaCO 3 ) 0.44g, barium nitrate (Ba(NO 3 ) 2 ) 1.15g, ammonium fluoride (NH 4 F) 0.08g, Dysprosium trioxide (Dy 2 O 3 )0.09g, lithium carbonate (Li 2 CO 3 ) 0.021g, after being fully ground in an agate mortar and evenly mixed, sintered in air at 1000°C for 3 hours, cooled to room temperature, the sample is taken out, ground, washed, and dried to obtain the final product.

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Abstract

The Dy excited white light emitting RE material for mercury-free fluorescent lamp has the chemical composition of M5-2xDyxRx (PO4)3F, M is alkali earth metal ion selected from Ca2+, Ba2+ and Sr2+, R is alkali metal ion selected from Li+, Na+ and K+, x is the molar percentage of corresponding dopping element relatively to the metal atom M and is 0.005-0.100. The Dy excited white emitting RE material has Dy ion as main light emitting ion and R ion is the charge compensating ion. Under the ultraviolet ray excitation in vacuum condition, the matrix material absorbs certain amount of energy and transmits the energy to Dy ion, so that the Dy ion emits white light. The preparation of the Dy excited white light emitting RE material is simple and can produce white light emitting material with proper color coordinate and high color purity.

Description

Technical field [0001] The invention relates to a dysprosium activated rare earth white light luminescent material for mercury-free fluorescent lamps and a preparation method thereof. Background technique [0002] Fluorescent lamps and cold cathode fluorescent lamps are the main indoor lighting sources and ideal backlight sources for liquid crystal devices. Their basic structure and light-emitting principle are: the lamp tube is filled with an appropriate amount of mercury and inert gas, and the inner wall of the lamp tube is coated with red, green, Three kinds of blue phosphors or two kinds of yellow and blue phosphors, with an electrode at each end. When high voltage is applied to both ends of the lamp tube, the mercury vapor in the lamp tube is excited by electrons to form a plasma, which can radiate 254 nanometer (nm) ultraviolet light, which excites the fluorescence coated on the inner wall of the tube The powder emits light, and the red-green-blue or yellow-blue light emitt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/81H01J61/44
CPCY02B20/181Y02B20/00
Inventor 梁宏斌曾取林惠红田梓峰苏锵
Owner SUN YAT SEN UNIV
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