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UV-emitting phosphors

A wavelength conversion, 2-a technology, applied in the field of light-emitting compounds, which can solve the problems of reduced conversion efficiency, Lewis basicity, low photochemistry, etc.

Inactive Publication Date: 2013-09-25
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently known UV-emitting wavelength-converting materials (also known as UV-emitting luminescent materials or UV-emitting phosphors), have many disadvantages, such as undesirably low conversion efficiency, low photochemical and / or chemical Stability, Lewis basicity, undesired chemical interactions with discharge leading to degradation of UV-emitting luminescent materials, and undesirably low disinfection efficiency due to spectral mismatch with bactericidal action curve
For example, in the presence of excimer discharges, the chemical instability of the luminescent material of US 2008 / 02588601 may require a protective coating such as aluminum oxide, which reduces the conversion efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example I

[0057] Example I Y 2 (SO 4 ) 3 : Preparation and Properties of Pr(1%)

[0058] Will 4.4936 grams of Y 2 O 3 and 0.06781 g Pr 2 (SO 4 ) 3 *6H 2 O as a reagent was dissolved in 20 ml of concentrated sulfuric acid, followed by heating until the acid was completely removed. The remaining powder was milled, placed in an alumina crucible, and annealed at 600°C under nitrogen for 4 hours. Figure 4a The resulting compound Y is shown in 1.99 (SO 4 ):Pr 0.01 (also written as Y 1.99 Pr 0.01 (SO 4 ) 3 ) of the XRD pattern. Figure 4b Reflection, excitation and emission spectra are shown in . The wavelength converting compound has >90% quantum efficiency.

example II

[0059] Example II Lu 2 (SO 4 ) 3 : Preparation and Properties of Pr(0.5%)

[0060] 7.9188 grams of Lu 2 O 3 and 0.06781 g Pr 2 (SO 4 ) 3 *6H 2 O as a reagent was dissolved in 20 ml of concentrated sulfuric acid, followed by heating until the acid was completely removed. The remaining powder was milled, placed in an alumina crucible, and annealed at 800°C under nitrogen for 4 hours. Figure 5a The resulting compound Lu is shown in 1.99 Pr 0.01 (SO 4 ) 3 XRD pattern. Figure 5b Reflection, excitation and emission spectra are shown in .

example III

[0061] Example III La 2 (SO 4 ) 3 : Preparation and Properties of Pr(1%)

[0062] Will 6.4836 grams of La 2 O 3 and 0.06781 g Pr 2 (SO 4 ) 3 *6H 2 O as a reagent was dissolved in 20 ml of concentrated sulfuric acid, followed by heating until the acid was completely removed. The remaining powder was milled, placed in an alumina crucible, and annealed at 800°C under nitrogen for 4 hours. Figure 6a The resulting compound La is shown in 1.98 Pr 0.02 (SO 4 ) 3 XRD pattern. Figure 6b Reflection, excitation and emission spectra are shown in .

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Abstract

The invention provides a wavelength converting material comprising a compound of the formula (Y1-w-x-y-zScwLaxGdyLuz)2-a(S04)3:Mea, wherein Me represents trivalent cation or a mixture of trivalent cations capable of emitting UV-C radiation, and wherein each of w, x, y and z is in the range of from 0.0 to 1.0 and w+x+y+z <= 1.0, and wherein 0.0005 <= a<= 0.2. The wavelength converting material may be applied in an illumination device for UV illumination, in particular for sterilization or disinfection by germicidal UV illumination.

Description

technical field [0001] The present invention relates to the field of UV-emitting luminescent compounds, for example for use in UV lamps. Background technique [0002] Fluorescent lamps that include UV-emitting phosphors are widely used in many applications, including disinfection and decontamination, leather tanning, medical treatment of skin, polymer hardening, and semiconductor wafer processing. [0003] Conventionally, sources of ultraviolet radiation are based on low or medium pressure mercury (Hg) discharges (also known as mercury vapor lamps). The emission line spectra of low-voltage Hg discharges are mainly 185 nm and 245 nm lines. Increasing pressure results in line broadening, increasing emission in the visible spectrum at the expense of UV emission. Therefore, as an ultraviolet emitter, the discharge efficiency of medium-voltage Hg is relatively low. The efficiency of Hg discharge lamps is strongly temperature dependent due to changes in Hg vapour pressure. Add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/74C09K11/77H05B33/14H05B33/18C09K11/08
CPCC09K11/7781A61B18/18C09K11/0822C09K11/7407C09K11/7701C09K11/7713H01J61/40H05B33/14H05B33/18
Inventor G.格雷尤伊J.普勒瓦H.贝坦特鲁普T.朱斯特
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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