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Moisture-resistant phosphor and associated method

A technology of phosphor and phosphor layer, applied in the field of phosphor material

Active Publication Date: 2013-03-27
GE LIGHTING SOLUTIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphors often turn brown, probably due to hydrolysis of MnF6–2 ions to hydrated manganese dioxide, which leads to a significant deterioration of the brightness of these phosphors

Method used

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  • Moisture-resistant phosphor and associated method
  • Moisture-resistant phosphor and associated method
  • Moisture-resistant phosphor and associated method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] prepared with K 2 TiF 6 coating (shell) with K 2 TiF 6 :Mn 4+ core complex fluoride phosphor.

[0057] Mn-free K 2 TiF 6 Commercially available from Fluka, manganese-doped K 2 TiF 6 Prepared in 70% HF solution with a drying temperature of 70°C according to the procedure described in cited US Patent 7,497,973.

[0058] 3 g K 2 TiF 6 Mix in 5 mL of 70% HF in a 70-90 °C water bath to prepare a saturated solution. This saturated solution was then poured over 3 g of K in a beaker 2 TiF 6 :Mn 4+ For the powder, the beaker was placed in a water bath, and in some cases, an oil bath. While pouring, the solution was stirred continuously at about 70°C. The suspension was recovered after stirring for about 15 minutes, then evaporated to a thick paste at about 70°C. The thick paste was then poured out on filter paper to dry. Drying was carried out in a dry box atmosphere at about 100°C.

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Abstract

A phosphor material contains encapsulated particles of manganese (Mn4+) doped fluoride phosphor. A method of encapsulating such particles is also provided. Each particle is encapsulated with a layer of a manganese-free fluoride phosphor. The use of such a phosphor material in a lighting apparatus results in improved stability and acceptable lumen maintenance over the course of the apparatus life.

Description

Background of the invention [0001] The present invention relates generally to phosphor materials, and in particular to red emitting phosphors. More particularly, the present invention relates to moisture resistant phosphors and lighting devices utilizing these phosphors. [0002] Light emitting diodes (LEDs) are semiconductor light emitters that are commonly used as replacements for other light sources, such as incandescent bulbs. They are used especially as indicator lights, warning lights and pilot lights, or for other applications requiring colored light. The color of light produced by an LED depends on the type of semiconductor material used in its manufacture. [0003] Colored semiconductor light emitting devices, including light emitting diodes and lasers (both generally referred to herein as LEDs), have been fabricated from Group III-V alloys such as gallium nitride (GaN). With regard to GaN-based LEDs, light is generally emitted in the UV to green range of the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/67
CPCC09K11/02H01L33/502C09K11/675H01L2224/48091H01L2224/48247Y10T428/2991H01L2924/00014C09K11/61C09K11/67C09K11/77
Inventor R.J.里昂L.S.格里戈罗夫A.A.塞特卢尔O.P.西奇罗文
Owner GE LIGHTING SOLUTIONS LLC
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