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Fluorescent lamps having high cri and lpw

A technology of red light and blue light, applied in phosphor composition, 4:Ce3+, which can solve the problems of high CRI and inability to obtain high LPW at the same time, and achieve the effect of improving LPW

Inactive Publication Date: 2013-03-13
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of tri-phosphor blends has improved color rendering or LPW, but often not both
The systems currently in use cannot simultaneously achieve the desired high LPW and high CRI, especially a CRI above 87

Method used

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  • Fluorescent lamps having high cri and lpw
  • Fluorescent lamps having high cri and lpw
  • Fluorescent lamps having high cri and lpw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Six lamps were prepared using a phosphor mixture according to an embodiment of the invention, the mixture comprising YEO / Y 2 o 3 :Eu 2 、LAP / LaPO 4 : Ce 3+ , Tb 3+ , BAM / BaMgAl 10 o 17 :Eu 2+ and BAMn / BaMgAl 10 o 17 :Eu 2+ , Mn 2+ . The lamp is a 4100K four-pin F32T8 linear fluorescent lamp.

[0047] Table 1: YEO-LAP-BAM-BAMn phosphor system.

[0048] light number

[0049] The lamp of Example 1, comprising the four-phosphor mixture according to the invention, exhibited in each case a CRI of 87 or higher and at the same time a high LPW of at least more than 86.

Embodiment 2

[0051] Using inclusive YEO / Y based on traditional lamp technology 2 o 3 :Eu 2+ (0.466 wt%), LAP / LaPO 4 : Ce 3+ , Tb 3+ (0.442 wt%) and BAM / BaMgAl 10 o 17 :Eu 2+ (0.092% by weight) of the tri-phosphor mixture also produced six lamps. The lamp is a 4100K four-pin F32T8 linear fluorescent lamp. As can be seen, the phosphor system includes the same red, green and blue phosphors as the system in Example 1. However, the blue-green phosphor of the system according to Example 1 of the present disclosure was not included.

[0052] Table 2: YEO-LAP-BAM phosphor system.

[0053] light number

[0054] The lamp of Example 2 achieves a higher LPW value than the lamp of Example 1 . However, the CRI value is lower than the expected value of 87 or higher than 87. Therefore, by comparing the data for the lamps from the phosphor coating system of Example 1 compared with this Example 2, it can be concluded that the addition of blue-green Phosphors, especially BAMn, result i...

Embodiment 3

[0056] Three lamps were prepared using four phosphor mixtures in which not all phosphors were rare earth phosphors. The mixture in this traditional phosphor system includes CBM / GdMgB5O10:Ce 3+ , Mn 2+ (3.01% by weight), halo / Ca5(PO4)3(F, Cl):Sb 3+ , Mn2+ (4.24 wt%), SAE / Sr 4 al 14 o 25 :Eu2+ (2.57% by weight) and Zn 2 SiO 4 :Mn 2+ (0.18% by weight). The lamp is a 4100K four-pin F32T8 linear fluorescent lamp.

[0057] Table 3: CBM-halo-SAE-Zn2SiO4 phosphor system.

[0058] light number

LPW

CRI

1

54.5

92.0

2

54.9

92.0

3

54.9

92.0

average

54.8

92.0

[0059] The lamps of Example 3 exhibit very low LPW values, although they do achieve very high CRI values ​​(92).

[0060] figure 2 Graphs showing the emission spectra of the respective phosphor mixtures of Examples 1, 2 and 3 are provided. The phosphor blend of Example 2, which is a known three-phosphor blend and pr...

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Abstract

A fluorescent lamp including the four rare earth phosphor system provided herein exhibits high color rendering index (CRI), of at least 87, while simultaneously achieving high lumen output, or lumens per watt (LPW), of at least 80. The phosphor coating may be disposed in a one or two layer coating format. The four rare earth phosphor system includes a red emitting phosphor, a green emitting phosphor, a blue emitting phosphor, and a blue-green emitting phosphor, all four phosphors being rare earth-doped phosphor compositions.

Description

Background technique [0001] This invention relates to phosphor compositions, and more particularly to phosphors for inclusion in fluorescent lamps. More particularly, the present invention relates to simultaneously increasing the CRI and LPW of fluorescent lamps by providing an optimized blend of four rare earth phosphors used in fluorescent lamps. [0002] Fluorescent lamps generally have a transparent glass envelope enclosing a sealed discharge space containing inert gas and mercury vapor. When subjected to an electric current provided by the electrodes, mercury ionizes to produce radiation with dominant UV wavelengths of 185nm and 254nm. This UV radiation in turn excites phosphors on the inner surface of the enclosure to produce visible light that is emitted through the glass. [0003] In general, fluorescent lamps for lighting employ phosphors that absorb 245 nm mercury-resonant waves and are activated to convert ultraviolet luminescence of mercury vapor into visible lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/42C09K11/81
CPCC09K11/7777H01J61/44C09K11/778C09K11/76C09K11/7787C09K11/7795H01J61/48C09K11/7734C09K11/7774
Inventor F·杜W·W·比尔斯J·B·詹斯马W·E·科亨
Owner GENERAL ELECTRIC CO
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