WO2008139397A1 - Novel color filters for color displays and light sources - Google Patents

Novel color filters for color displays and light sources Download PDF

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Publication number
WO2008139397A1
WO2008139397A1 PCT/IB2008/051841 IB2008051841W WO2008139397A1 WO 2008139397 A1 WO2008139397 A1 WO 2008139397A1 IB 2008051841 W IB2008051841 W IB 2008051841W WO 2008139397 A1 WO2008139397 A1 WO 2008139397A1
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systems
compound
lighting
lighting systems
present
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PCT/IB2008/051841
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French (fr)
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Thomas Juestel
Joachim Opitz
Dominique Uhlich
Helga Bettentrup
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Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N. V.
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Publication of WO2008139397A1 publication Critical patent/WO2008139397A1/en

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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7759—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing samarium
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    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
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Definitions

  • the present invention is directed to novel color filters for color displays and light sources
  • Color pigments are widely applied in full color (RGB) displays, such as Plasma Display Panels (PDPs), Liquid Crystal Displays (LCDs), Surface conduction Electron emitter Displays (SEDs) and in colored light sources, e.g. red or blue emitting incandescent lamps.
  • PDPs Plasma Display Panels
  • LCDs Liquid Crystal Displays
  • SEDs Surface conduction Electron emitter Displays
  • colored light sources e.g. red or blue emitting incandescent lamps.
  • the compounds used for pigmentation usually need to meet several severe requirements: They should be sufficiently stable under high excitation density, not out-gas in the given environment of the application and be capable of withstanding temperatures of typically 550 0 C during display or lamp manufacture.
  • A is selected from the group comprising Li, Na, K, Cs, Rb or mixtures thereof
  • B is selected from the group comprising La, Pr, Nd or mixtures thereof
  • x is > 0 and ⁇ 1.
  • additives may also be present in the bulk compositions. These additives particularly include species that are known in the art as fluxes. Suitable fluxes include alkaline earth oxides and fluorides or alkaline-metal, oxides and fluorides, SiO 2 and the like and mixtures thereof.
  • this compound has rather narrow absorption bands with steep absorption edges which makes it advantageous for many applications.
  • the limited absorption range due to the steep absorption edges can result in very saturated colors, when these pigments are applied as color filters.
  • the band gap of the compound is > 2.5 eV and ⁇ 5 eV. This has been found to be advantageous for many applications for which the inventive compound may be of use.
  • the band gap of the compound is > 2.7 eV and ⁇ 4 eV, more preferably > 3 eV and ⁇ 3.75 eV.
  • the compound has a melting point of > 800 0 C and ⁇ 1300 0 C, more preferably > 900 0 C and ⁇ 1200 0 C and most preferably > 1000 0 C and ⁇ 1100 0 C.
  • A is selected from the group comprising Rb, Cs or mixtures thereof. It has surprisingly been found that the resulting compounds have a novel structure, which makes them even more advantageous for the present invention.
  • the present invention also relates to a compound B 2 (Mo i_ xW x ) 2+y O 9+3y ,wherein
  • B is selected from the group comprising La, Pr, Nd or mixtures thereof, and x is >0 and ⁇ 1 and y is 0 or 1.
  • additives may also be present in the bulk compositions. These additives particularly include species known in the art as fluxes. Suitable fluxes include alkaline earth oxides and fluorides or alkaline metal oxides and fluorides, SiC>2 and the like and mixtures thereof.
  • LEDs may be built which show improved lighting features, especially due to the high lumen equivalent, their fast decay, and their high conversion efficiency.
  • the limited absorption range due the steep absorption edges can result in very saturated colors, when these pigments are applied as color filters.
  • the band gap of the compound is > 2.5 and ⁇ 5 eV. This has been found to be advantageous for many applications for which the inventive compound may be of use.
  • the band gap of the compound is > 2.7 and ⁇ 4 eV, more preferably > 3 eV and ⁇ 3.75 eV.
  • B comprises Pr and the compound has a diffuse reflectance in the region between > 520 nm and ⁇ 530 nm, more preferably in the region > 510 and ⁇ 540, of >80%, more preferably >85%. As a result, these compounds especially are advantageous for use as green color filters.
  • the compound has a melting point of > 800 0 C and ⁇ 1300 0 C , more preferably > 900 0 C and ⁇ 1200 0 C and most preferably > 1000 0 C and ⁇ 1100 0 C.
  • these compounds especially are advantageous due to the easier processing of the compounds.
  • the present invention furthermore relates to the use of the inventive compound(s) as and/or with a color filter.
  • a color filter especially means and/or includes that the inventive compound(s) form(s) and/or act(s) as one of the material(s) of a color filter.
  • the inventive compound(s) is (are) used in color filters for colored light sources, in particular in incandescent lamps, fluorescent tubes, energy saving lamps, inorganic LEDs, or organic LEDs and /or full color RGB displays, such as - but not limited to - Plasma Display Panels (PDPs), Liquid Crystal Displays (LCDs), Surface conduction Electron emitter Displays (SEDs).
  • PDPs Plasma Display Panels
  • LCDs Liquid Crystal Displays
  • SEDs Surface conduction Electron emitter Displays
  • the present invention furthermore relates to the use of the inventive compound(s) as and/or with paints.
  • inventive compound(s) especially means and/or includes that the inventive compound(s) form(s) and/or act(s) as one of the material(s) of (a) paints.
  • the at least one compound is provided at least partially in pigment form and/or as a pigment
  • a compound and/or a color filter according to the present invention may be of use in a broad variety of systems and/or applications, such as one or more of the following: - Office lighting systems household application systems shop lighting systems, home lighting systems, accent lighting systems, - spot lighting systems, theatre lighting systems, fibre-optics application systems, projection systems, self-lit display systems, - pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, and decorative lighting systems - portable systems automotive applications green house lighting systems
  • Fig. 1 shows a reflection spectrum of a compound according to a first example of the present invention.
  • Fig. 2 shows a reflection spectrum of a compound according to a second example of the present invention.
  • Fig. 3 shows a reflection spectrum of a compound according to a third example of the present invention.
  • Fig.4 shows a reflection spectrum of a compound according to a fourth example of the present invention.
  • Fig. 5 shows XRD spectra of the compound of the fourth example of the present invention (cf. Fig. 4)
  • Fig. 6 shows a DTA/TG analysis of a compound according to a fifth example of the present invention.
  • Fig. 7 shows a reflection spectrum of a compound according to a sixth example of the present invention.
  • Fig. 8 shows a reflection spectrum of a compound according to a seventh example of the present invention; and
  • Fig. 9 shows a reflection spectrum of a compound according to an eighth example of the present invention.
  • Example I refers to Pr 2 M ⁇ 3 ⁇ i2, which was made as follows:
  • Pr 6 On and Mo ⁇ 3 are suspended in acetone and thoroughly milled in an agate mortar. Afterwards the blend was dried in a drying furnace at 100 0 C for 1 h. The dried blend was subsequently annealed in aluminum crucibles at 1000 0 C in a CO atmosphere. Finally, the obtained powder cake is milled again and fired at 1000 0 C for 2 h in air.
  • Fig. 1 shows the reflection spectrum of Pr 2 M ⁇ 3 ⁇ i2. It can be seen from the spectra of Fig. 1 that this compound has a rather narrow absorption band in the area around 570-580 nm and almost no absorption in the area between 510-540 nm, which makes this compound a very good green color filter material. Without being bound to any theory, the inventors believe that these surprising features of the inventive compounds result at least partly from the rather high covalent character of the host lattice and the activator-oxygen bonds. This may then result in a covalent interaction between cations and anions, leading to a partial relaxation of the quantum mechanical selection rules. Consequently, the transition probability of 4f- 4f transitions increases and the colors of the respective pigments are much more saturated. EXAMPLE II:
  • Example II refers to Nd 2 M ⁇ 3 ⁇ i 2 , which was made similarly to the compound of Example I.
  • Fig. 2 shows the reflection spectrum of Nd2M ⁇ 3 ⁇ i2. From the spectra it can be seen that this compound is an excellent violet color filter material.
  • Example III refers to La 2 M ⁇ 3 ⁇ i2, which was made similarly to the compounds of Example I and II.
  • Fig. 3 shows the reflection spectrum of La 2 M ⁇ 3 ⁇ i2. From the Figure it can be seen that this compound can be used as an excellent white pigment material.
  • Example IV refers to CsLaMo 2 Og which was made similarly to the compounds of Example I to III.
  • Fig. 4 shows the reflection spectrum Of CsLaMo 2 Og. From the Figure it can be seen that this compound can be used as an excellent white pigment material.
  • Fig. 5 shows the XRD-spectrum Of CsLaMo 2 Og. It can be seen that this compound has a novel unique structure as described above.
  • Example V refers to La 2 WsOi 2 , which was made similarly to the compounds of Example I to IV.
  • Fig. 6 shows the DTA (straight line) / TG (dotted line) analysis of
  • Example VI refers to Pr 2 Mo 2 Og, which was made similarly to the compounds of Example I to V.
  • Fig. 7 shows the reflection spectrum OfPr 2 Mo 2 Og It can be seen from the spectra of Fig. 7 that this compound has a rather narrow absorption band in the area around 580-590 nm and almost no absorption in the area between 520-540 nm, which makes this compound a very good green color filter material.
  • Example VII refers to Nd 2 Mo 2 Og, which was made similarly to the compounds of Example I to VI.
  • Fig. 8 shows the reflection spectrum OfNd 2 Mo 2 Og. From the spectra it can be seen that this compound is an excellent violet color filter material.
  • Example VIII refers to La 2 Mo 2 Og, which was made similarly to the compounds of Example I to VII.
  • Fig. 9 shows the reflection spectrum OfLa 2 Mo 2 Og. From the Figure it can be seen that this compound can be used as an excellent white pigment material.
  • the particular combinations of elements and features in the above detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this and other patents/applications incorporated by reference are also expressly contemplated.
  • variations, modifications, and other implementations of what is described herein can occur to those of ordinary skill in the art without departing from the spirit and scope of the invention as claimed. Accordingly, the foregoing description is by way of example only and is not intended as limiting.
  • the invention's scope is defined in the following claims and equivalents thereto.
  • reference signs used in the description and claims do not limit the scope of the invention as claimed.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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Abstract

The invention relates to improved novel color filters of the formula AB(Mo1-xWx)2O8, B2(Mo1-xWx)2O8 and B2(Mo1-xWx)3O12 for use in color displays and light sources,. The rather low melting points, good stability as well as narrow absorption bands with steep absorption edges make these materials excellently suited for use as color filters for many applications.

Description

Novel Color Filters for Color Displays and Light Sources
FIELD OF THE INVENTION
The present invention is directed to novel color filters for color displays and light sources
BACKGROUND OF THE INVENTION
Color pigments are widely applied in full color (RGB) displays, such as Plasma Display Panels (PDPs), Liquid Crystal Displays (LCDs), Surface conduction Electron emitter Displays (SEDs) and in colored light sources, e.g. red or blue emitting incandescent lamps. The compounds used for pigmentation usually need to meet several severe requirements: They should be sufficiently stable under high excitation density, not out-gas in the given environment of the application and be capable of withstanding temperatures of typically 5500C during display or lamp manufacture.
However, there is still the continuing need for novel color filters for color displays and light sources, which are usable within a wide range of applications and especially have narrower absorption bands with steep absorption edges than the compounds of the prior art.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a compound which is usable within a wide range of applications and especially in applications in which narrow absorption bands with steep absorption edges are advantageous.
This object is achieved by a compound according to claim 1 of the present invention. Accordingly, a compound
Figure imgf000003_0001
is provided, where
A is selected from the group comprising Li, Na, K, Cs, Rb or mixtures thereof, B is selected from the group comprising La, Pr, Nd or mixtures thereof, and x is > 0 and < 1.
It should be noted that the formula ,AB(Mo i-xWx)2θ8" is to be taken to mean and/or include, particularly and/or additionally, any compound which has essentially this composition.
The term "essentially" means especially > 95 %, preferably > 97 % and most preferably > 99 % wt-%. However, in some applications, trace amounts of additives may also be present in the bulk compositions. These additives particularly include species that are known in the art as fluxes. Suitable fluxes include alkaline earth oxides and fluorides or alkaline-metal, oxides and fluorides, SiO2 and the like and mixtures thereof.
Such a compound has shown to have at least one of the following advantages for a wide range of applications within the present invention:
Using the compound for color displays and light sources, it has been shown that this compound has rather narrow absorption bands with steep absorption edges which makes it advantageous for many applications.
Due to the fact that many compounds within the present invention have a rather low melting point (1000 - 11000C) - which is actually a preferred embodiment of the present invention - their synthesis is allowed to take place at a moderate temperature, thereby additionally easing their processing during the manufacture of the device.
The limited absorption range due to the steep absorption edges can result in very saturated colors, when these pigments are applied as color filters.
According to a preferred embodiment of the present invention, the band gap of the compound is > 2.5 eV and < 5 eV. This has been found to be advantageous for many applications for which the inventive compound may be of use. Preferably, the band gap of the compound is > 2.7 eV and < 4 eV, more preferably > 3 eV and < 3.75 eV.
According to a preferred embodiment of the present invention, the compound has a melting point of > 8000C and < 13000C, more preferably > 9000C and < 12000C and most preferably > 10000C and < 1100 0C. By virtue thereof, these compounds especially are advantageous due to the easier way of processing the compound. According to a preferred embodiment of the present invention, A is selected from the group comprising Rb, Cs or mixtures thereof. It has surprisingly been found that the resulting compounds have a novel structure, which makes them even more advantageous for the present invention.
Compounds according to the formula (Cs,Rb)(Lai_a_b-c- dYaGdbLucTbd)(Mθi-x Wx)2O8 crystallize in the novel structure in the tetragonal crystal system (space group P 4/n n c ( No. 126 )). The cell parameters are α = β = γ = 90° a = 6.5475 A c = 9.5925 A cell volume = 411.77 A3, and the structure refinement was done on the basis of an x-ray diffraction pattern taken by Cu kα radiation.
The present invention also relates to a compound B2(Mo i_ xWx)2+yO9+3y,wherein
B is selected from the group comprising La, Pr, Nd or mixtures thereof, and x is >0 and <1 and y is 0 or 1.
It should be noted that the formula ,,B2(Mo i-xWx)2+yO9+3y" is to be taken to mean and/or include, particularly and or additionally, any compound which has essentially this composition.
The term "essentially" means especially > 95 %, preferably > 97 % and most preferably > 99 % wt-%. However, in some applications, trace amounts of additives may also be present in the bulk compositions. These additives particularly include species known in the art as fluxes. Suitable fluxes include alkaline earth oxides and fluorides or alkaline metal oxides and fluorides, SiC>2 and the like and mixtures thereof.
Such a compound has shown to have at least one of the following advantages for a wide range of applications within the present invention:
Using the compound as a luminescent compound, LEDs may be built which show improved lighting features, especially due to the high lumen equivalent, their fast decay, and their high conversion efficiency.
Due to the fact that many compounds within the present invention have rather low melting points (1000 - 11000C), their synthesis is allowed to take place at a moderate temperature, thereby additionally easing their processing during the manufacture of the device.
The limited absorption range due the steep absorption edges can result in very saturated colors, when these pigments are applied as color filters.
According to a preferred embodiment of the present invention, the band gap of the compound is > 2.5 and < 5 eV. This has been found to be advantageous for many applications for which the inventive compound may be of use. Preferably, the band gap of the compound is > 2.7 and < 4 eV, more preferably > 3 eV and < 3.75 eV. According to a preferred embodiment of the present invention, B comprises Pr and the compound has a diffuse reflectance in the region between > 520 nm and < 530 nm, more preferably in the region > 510 and < 540, of >80%, more preferably >85%. As a result, these compounds especially are advantageous for use as green color filters. According to a preferred embodiment of the present invention, the compound has a melting point of > 8000C and < 13000C , more preferably > 9000C and < 12000C and most preferably > 10000C and < 1100 0C. As a result, these compounds especially are advantageous due to the easier processing of the compounds.
The present invention furthermore relates to the use of the inventive compound(s) as and/or with a color filter.
The term "with a color filter" especially means and/or includes that the inventive compound(s) form(s) and/or act(s) as one of the material(s) of a color filter.
According to a preferred embodiment of the present invention, the inventive compound(s) is (are) used in color filters for colored light sources, in particular in incandescent lamps, fluorescent tubes, energy saving lamps, inorganic LEDs, or organic LEDs and /or full color RGB displays, such as - but not limited to - Plasma Display Panels (PDPs), Liquid Crystal Displays (LCDs), Surface conduction Electron emitter Displays (SEDs).
The present invention furthermore relates to the use of the inventive compound(s) as and/or with paints. The term "with paints" especially means and/or includes that the inventive compound(s) form(s) and/or act(s) as one of the material(s) of (a) paints.
Preferably, the at least one compound is provided at least partially in pigment form and/or as a pigment
If the at least one compound is provided at least partially as a pigment, it is especially preferred that the pigment has a dso of > 0.5 μm and < 30 μm. This has been shown to be advantageous for a wide range of applications within the present invention. A compound and/or a color filter according to the present invention may be of use in a broad variety of systems and/or applications, such as one or more of the following: - Office lighting systems household application systems shop lighting systems, home lighting systems, accent lighting systems, - spot lighting systems, theatre lighting systems, fibre-optics application systems, projection systems, self-lit display systems, - pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, and decorative lighting systems - portable systems automotive applications green house lighting systems
The aforementioned components, as well as the claimed components and the components to be used in accordance with the invention in the described embodiments, are not subject to any special exceptions with respect to their size, shape, compound selection and technical concept, so that the selection criteria known in the pertinent field can be applied without limitations.
BRIEF DESCRIPTION OF THE DRAWINGS
Additional details, features, characteristics and advantages of the object of the invention are disclosed in the sub-claims, the Figures and the following description of the respective Figures and examples, which —in an exemplary fashion— show several embodiments and examples of inventive compounds.
Fig. 1 shows a reflection spectrum of a compound according to a first example of the present invention.
Fig. 2 shows a reflection spectrum of a compound according to a second example of the present invention.
Fig. 3 shows a reflection spectrum of a compound according to a third example of the present invention. Fig.4 shows a reflection spectrum of a compound according to a fourth example of the present invention. Fig. 5 shows XRD spectra of the compound of the fourth example of the present invention (cf. Fig. 4) Fig. 6 shows a DTA/TG analysis of a compound according to a fifth example of the present invention. Fig. 7 shows a reflection spectrum of a compound according to a sixth example of the present invention. Fig. 8 shows a reflection spectrum of a compound according to a seventh example of the present invention; and Fig. 9 shows a reflection spectrum of a compound according to an eighth example of the present invention.
The invention will be further explained by means of the following
Examples I to VIII which - in a merely illustrative fashion - show several compounds of the present invention.
EXAMPLE I: Example I refers to Pr2Mθ3θi2, which was made as follows:
Pr6On and Moθ3 are suspended in acetone and thoroughly milled in an agate mortar. Afterwards the blend was dried in a drying furnace at 1000C for 1 h. The dried blend was subsequently annealed in aluminum crucibles at 10000C in a CO atmosphere. Finally, the obtained powder cake is milled again and fired at 10000C for 2 h in air.
Fig. 1 shows the reflection spectrum of Pr2Mθ3θi2. It can be seen from the spectra of Fig. 1 that this compound has a rather narrow absorption band in the area around 570-580 nm and almost no absorption in the area between 510-540 nm, which makes this compound a very good green color filter material. Without being bound to any theory, the inventors believe that these surprising features of the inventive compounds result at least partly from the rather high covalent character of the host lattice and the activator-oxygen bonds. This may then result in a covalent interaction between cations and anions, leading to a partial relaxation of the quantum mechanical selection rules. Consequently, the transition probability of 4f- 4f transitions increases and the colors of the respective pigments are much more saturated. EXAMPLE II:
Example II refers to Nd2Mθ3θi2, which was made similarly to the compound of Example I. Fig. 2 shows the reflection spectrum of Nd2Mθ3θi2. From the spectra it can be seen that this compound is an excellent violet color filter material.
EXAMPLE III:
Example III refers to La2Mθ3θi2, which was made similarly to the compounds of Example I and II.
Fig. 3 shows the reflection spectrum of La2Mθ3θi2. From the Figure it can be seen that this compound can be used as an excellent white pigment material.
EXAMPLE IV: Example IV refers to CsLaMo2Og which was made similarly to the compounds of Example I to III.
Fig. 4 shows the reflection spectrum Of CsLaMo2Og. From the Figure it can be seen that this compound can be used as an excellent white pigment material.
Fig. 5 shows the XRD-spectrum Of CsLaMo2Og. It can be seen that this compound has a novel unique structure as described above.
EXAMPLE V:
Example V refers to La2WsOi2, which was made similarly to the compounds of Example I to IV. Fig. 6 shows the DTA (straight line) / TG (dotted line) analysis of
La2WsOi2. This compound has a (rather low) melting point at approximately 10400C, which makes this compound suitable for many applications within the present invention. EXAMPLE VI:
Example VI refers to Pr2Mo2Og, which was made similarly to the compounds of Example I to V.
Fig. 7 shows the reflection spectrum OfPr2Mo2Og It can be seen from the spectra of Fig. 7 that this compound has a rather narrow absorption band in the area around 580-590 nm and almost no absorption in the area between 520-540 nm, which makes this compound a very good green color filter material.
EXAMPLE VII: Example VII refers to Nd2Mo2Og, which was made similarly to the compounds of Example I to VI.
Fig. 8 shows the reflection spectrum OfNd2Mo2Og. From the spectra it can be seen that this compound is an excellent violet color filter material.
EXAMPLE VIII:
Example VIII refers to La2Mo2Og, which was made similarly to the compounds of Example I to VII.
Fig. 9 shows the reflection spectrum OfLa2Mo2Og. From the Figure it can be seen that this compound can be used as an excellent white pigment material. The particular combinations of elements and features in the above detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this and other patents/applications incorporated by reference are also expressly contemplated. As those skilled in the art will recognize, variations, modifications, and other implementations of what is described herein can occur to those of ordinary skill in the art without departing from the spirit and scope of the invention as claimed. Accordingly, the foregoing description is by way of example only and is not intended as limiting. The invention's scope is defined in the following claims and equivalents thereto. Furthermore, reference signs used in the description and claims do not limit the scope of the invention as claimed.

Claims

CLAIMS:
1. AB(Mo LxWx)2O8, where
A is selected from the group comprising Li, Na, K, Cs, Rb or mixtures thereof, B is selected from the group comprising La, Pr, Nd or mixtures thereof, and x is >0 and <1.
2. The compound of claim 1, having a band gap of >2.5 and <5.
3. The compound of claim 1 or 2, having a melting point of >800 0C and <1300 °C
4. B2(Mo i-xWx)2+yθ9+3y, where
B is selected from the group comprising La, Pr, Nd or mixtures thereof, and x is >0 and <1 and y is 0 or 1.
5. The compound of claim 4, having a band gap of >2.5 and <5.
6. The compound of claim 4 or 5, having a melting point of >800 0C and
<1300 °C
7. The compound of any of the claims 1 to 6, provided at least partially in pigment form and/or as a pigment, preferably with a dso of > 0.5 μm and < 30 μm.
8. Use of a compound according to any of the claims 1 to 6 as and/or with a color filter, preferably for use in colored light sources, in particular incandescent lamps, fluorescent tubes, energy saving lamps, inorganic LEDs, organic LEDs and /or full color RGB displays, and/or as and/or with paint
9. A color filter comprising a compound according to any of the claims l to 7.
10. A system comprising a compound according to any of the claims 1 to 7 and/or a color filter according to claim 9, and/or making use of a compound according to Claim 8, the system being used in one or more of the following applications:
Office lighting systems - household application systems shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, - theatre lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, - segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, and decorative lighting systems - portable systems automotive applications green house lighting systems
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