Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • 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
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • 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
  • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
  • C09K11/77342—Silicates
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B33/00—Electroluminescent light sources
  • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
  • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
  • H10H20/80—Constructional details
  • H10H20/85—Packages
  • H10H20/851—Wavelength conversion means
  • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
  • H10H20/8512—Wavelength conversion materials

Definitions

• the invention relates to a light-emitting device comprising a plastic molding, with which in combination with a plastic molding and e.g. blue LEDs (Light Emitting Diodes) or UV LEDs, which are located in cavities of the plastic molding, white light can be generated.
• a plastic molding with which in combination with a plastic molding and e.g. blue LEDs (Light Emitting Diodes) or UV LEDs, which are located in cavities of the plastic molding, white light can be generated.
• the invention also relates to a composition of plastic containing certain inorganic conversion pigments in certain concentration ranges, which is suitable, for example, for the production of these plastic moldings.
• the lighting industry is particularly interested in light sources that produce white light with a good color rendition, as this is most similar to natural light.
• LEDs Light Emitting Diodes
• LED DIEs LED chips
• LEDs Light Emitting Diodes
• LED DIEs LED chips
• the emission colors which can not be generated with the LEDs or LED DIEs themselves, are generated by means of external color conversion.
• So-called conversion substances or conversion pigments are arranged around the LEDs or LEDs DIEs.
• the absorbed radiation excites the conversion pigments for photoluminescence.
• organic or inorganic pigments can be used as conversion pigments.
• LEDs or LEDs have the disadvantage that they only produce monochromatic light, i. Send out light of only one light color.
• these are in particular the light colors blue, green, yellow, orange, red, violet or monochromatic UV light (UV LEDs) and in the case of electroluminescent lamps, these are in particular the light colors blue, green or orange. LEDs that emit white light without additional aids are not technically possible.
• white light sources based on LEDs are produced by various methods.
• organic and inorganic conversion pigments are used to produce white light with the monochromatic light-emitting elements.
• the light-emitting elements are suitably combined with the conversion pigments.
• the color of the emitted white light depends on the conversion pigment, its concentration and on the wavelength of the light-emitting element.
• the homogeneity of the radiated light is determined by the uniformity of the distribution of the conversion pigment on the light-emitting element or the light-emitting device.
• conversion pigments can absorb part of the blue light of an LED and emit yellow light.
• the additive color mixture of the remaining blue light and the yellow light generated by a color layer produces white light.
• the color locus can be set on a line between the color locations of the blue LED and the conversion pigment in the CIE 1931 standard color chart.
• the blue LEDs used have an emission maximum at 240 to 510 nm, at 300 to 500 mm, especially at 400 to 490 mm, especially at 450 to 480 mm and especially at 460 to 470 nm. In a most preferred embodiment, the emission maximum is between 460 and 470 mm, preferably at 464 nm.
• Another method is performed similarly to the aforementioned method, but a multicolor phosphor or a mixture of various suitable phosphors is used.
• the phosphor mixtures are applied to the LED DIEs by means of "spray coating" prior to the casting of the LEDs.This process is very complicated and can only be carried out by means of expensive devices under clean room conditions.
• light emitting diodes of different colors e.g. Blue and Yellow (two LEDs) or Red, Green and Blue (RGB) combined so that the combined light appears white.
• RGB Red, Green and Blue
• the object was therefore to overcome the aforementioned disadvantages of the prior art, and to provide a plastic composition which avoids inhomogeneous radiation of the converted light in a light-emitting device, and in particular also the production.
• a light-emitting device should also be provided which is simple and inexpensive to produce in any shape, consumes little energy and is insensitive to external influences.
• stray light is to be understood as meaning light which can be detected at angles of 20 ° or 45 ° C. to the perpendicular from the plane of the light source / LED.
• the scattered light intensity is at an angle of 20 ° greater than 0.7, preferably greater than 0.85, and at an angle of 45 ° greater 0.4, preferably greater than 0.55 to be achieved.
• plastic composition according to the invention and by a transparent or semitransparent plastic molding, in particular a transparent or semitransparent cover plate or film, from this plastic composition and by the device according to the invention , in which the plastic molding is used to be solved.
• the invention thus relates to a plastic composition (Z) which contains certain conversion pigments (K) in specific concentration ranges and to a substrate A which is a transparent or semitransparent plastic molded article, for example a transparent or semi-transparent plastic molded article semitransparent plastic sheet or film containing this plastic composition Z, and which can be used in particular in light-emitting devices.
• a plastic composition (Z) which contains certain conversion pigments (K) in specific concentration ranges
• a substrate A which is a transparent or semitransparent plastic molded article, for example a transparent or semi-transparent plastic molded article semitransparent plastic sheet or film containing this plastic composition Z, and which can be used in particular in light-emitting devices.
• the invention also provides a device, in particular a white light-emitting device, consisting of a plastic molding (hereinafter referred to as substrate B) which has at least partially on its surface one or more cavities equipped with LEDs or LEDs, and of the substrate A according to the invention at least partially covers the side of the molding having the cavities, and which may optionally be connected to the substrate B via an additional adhesive or adhesive layer.
• substrate B plastic molding
• Substrate A and possibly the substrate B having the cavities may additionally contain light-scattering particles and / or have a light-scattering structuring.
• Another object of the invention is a method for producing the device according to the invention, wherein
• the substrate B is produced with a drier multiple cavities, b) the cavity (s) are equipped with one or more LEDs, preferably LED DDEs, which are electrically connected to one another, c) the substrate A, consisting of a transparent or semitransparent
• Plastic molding, foil or plate containing conversion pigments K is applied, in the form that the substrate A at least partially covers the equipped with LEDs or LED DIEs (n) cavity (s).
• Crossing or “covered” in the sense of the invention means that the light used for the application irradiates the substrate A or the shaped body with the conversion pigments and is partially color-converted.
• the substrate A can be mounted directly in front of or with a certain distance in front of the light-emitting element or in front of the substrate B with one or more cavities which are equipped with an electroluminescent element or one or more LEDs, preferably LED DIEs glued directly to the light-emitting element with a transparent adhesive / adhesion promoter or attached to a shaped body or housing in which the light-emitting element is located, for example by gluing or mechanical fastening, or mounted on a printed circuit board or flexible printed circuit board, on which the light-emitting element is located.
• Between light-emitting element (eg LED or LED DIE) and substrate A may be one or more substantially transparent adhesive layers, film layers or air.
• the substrate A can also be arranged partially or completely around the substrate B.
• the production of the substrate A and the substrate B are preferably carried out in a compounding and injection molding or extrusion step. The manufacturing process enables a reproducible standardized product.
• Essential to the invention is the inventive composition of plastic (hereinafter referred to as "Z"), containing certain conversion pigments K in certain concentration (conc B), which allows simultaneous light conversion and scattering of LED light in a homogeneous manner.
• composition Z according to the invention is suitable, for example, for producing the substrate A, which can be used, for example, in the device described in combination with the shaped articles containing LEDs or LED DIEs.
• This device is just one example of how the composition of the invention can be used advantageously, further possibilities will be apparent to those skilled in the art from known LED-containing devices.
• the substrate A for example the film or plate according to the invention which contains the conversion pigments K, is positioned between the LED light source and the viewer.
• the conversion pigment K may additionally be present in the substrate B, which contains the LED or LED DIEs.
• the device according to the invention comprises a plastic molded body (substrate B) which is provided with one or more cavities.
• the cavities are equipped with LEDs, preferably LED DIEs, which are electrically connected to each other.
• the plastic molding with the LEDs or DIEs can optionally be cast with a silicone or polyurethane-based potting compound, which is optionally applied as a primer in the form of an adhesive layer. Thereafter, the substrate A, which contains the uniformly distributed conversion pigments K and has scattering properties, is applied.
• Suitable conversion pigments K are both organic and inorganic pigments. Conversion pigment in the sense of the invention is also understood to mean a mixture of two or more different conversion pigments.
• compositions Z are best suited for the production of light-converting and light-scattering substrates if their content of conversion pigments K is in a concentration range from 7 to 20, preferably 10 to 15,% by weight. Both below and above these limits, there is a collapse of the properties of the compositions Z in view of the underlying task of the invention.
• organic pigments include so-called daylight pigments such as the T-series or FTX series from Swada or the daylight pigments from Sinloihi, such as the FZ-2000 series, FZ-5000 series, FZ-6000 series, FZ-3040 series, FA-40 series , FA-200 series, FA-OOO series. FM-100, FX-300 or SB-10.
• garnets or oxynitrides can be used, such as (Y, Gd, Lu, Tb) 3 (Al, Ga) 5 O n doped with Ce, (Ca, Sr, Ba) 2 SiO 4 doped with Eu, YSiO 2 N doped with Ce, Y 2 Si 3 O 3 N 4 doped with Ce, Gd 2 Si 3 O 3 N 4 doped with Ce, (Y, Gd, Tb, Lu) 3 Al 5 -xSixOi 2 -xNx doped with Ce, BaMgAl 10 O 17 doped with Eu, SrAl 2 O 4 doped with Eu, Sr 4 Al 14 O 25 doped with Eu, (Ca, Sr, Ba) Si 2 N 2 O 2 doped with Eu, SrSiAl 2 O 3 N 2 doped with Eu, (Ca, Sr, Ba) 2 Si 2 N 8 doped with Eu, CaAlSiN 3 doped with Eu; Molybdate, tungstates
• the conversion pigments K according to the invention are particularly preferably inorganic pigments which contain Si, Sr, Ba, Ca and Eu in concentrations> 0 ppm and in concentrations of ⁇ 50 ppm (including 0 ppm) Al, Co, Fe, Mg, Mo. , Na, Ni, Pd, P, Rh, Sb, Ti and Zr.
• Both plastic composition Z and the substrate A preferably contain as base material transparent polymeric materials which are preferably selected from the group of plastics consisting of polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters, for example polyalkylene terephthalates such as polyethylene terephthalate (PET) and polybutylene terephthalate ( PBT), Cyanoacrylate (CA), Cellulose Triacetate (CTA), Ethyl Vinyl Acetate (EVA), Propyl Vinyl Acetate (PVA), Polyvinyl Butyral (PVB), Polyvinyl Chloride (PVC), Polycarbonate (PC), Polyethylene Naphthalate (PEN), Polyurethane (PU), Thermoplastic Polyurethane (TPU), polyamide (PA), polymethyl methacrylate (PMMA), polystyrene (PS), cellulose nitrate and copolymers of at least two of the monomers of the aforementioned polymers and mixtures of two or more of these polymers are selected.
• Suitable polycarbonates in the context of the present invention are all known polycarbonates. These are homopolycarbonates, copolycarbonates and thermoplastic polyester carbonates.
• the suitable polycarbonates preferably have average molecular weights Mw of from 10,000 to 50,000, preferably from 14,000 to 40,000 and in particular from 14,000 to 35,000, determined by measuring the relative solution viscosity in dichloromethane or in mixtures of equal amounts by weight of phenol / o-dichlorobenzene calibrated by light scattering.
• the preparation of the polycarbonates is preferably carried out by the interfacial process or the melt transesterification process, which are described in various ways in the literature. For the interfacial process, see, for example, H. Schnell, "Chemistry and Physics of Polycarbonates", Polymer Reviews, Vol. 9, Inter-economy Publishers, New York 1964, p. 33 et seq., Polymer Reviews, Vol.
• melt transesterification process is described, for example, in the Encyclopedia of Polymer Science, Vol. 10 (1969), Chemistry and Physics of Polycarbonates, Polymer Reviews, H. Schnell, Vol. 9, John Wiley and Sons, Inc. (1964) and in US Pat Patent DE-B 10 31 512 and US-B 6 228 973 described.
• the polycarbonates are preferably prepared by reactions of bisphenol compounds with carbonic acid compounds, in particular phosgene or, in the melt transesterification process, diphenyl carbonate or dimethyl carbonate.
• carbonic acid compounds in particular phosgene or, in the melt transesterification process, diphenyl carbonate or dimethyl carbonate.
• homopolycarbonates based on bisphenol A and copolycarbonates based on the monomers bisphenol A and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane are particularly preferred.
• the polycarbonates may be linear or branched. Mixtures of branched and unbranched polycarbonates can also be used.
• Suitable branching agents for polycarbonates are known from the literature and described, for example, in US Pat. Nos. 4,185,009 and DE-A 25 00 092 (3,3-bis- (4-hydroxyaryloxindoles according to the invention, see, in each case, the complete document) DE-A 42 40 313 (see page 3, line 33 to page 3, line 55), DE-A 19 943 642 (see page 5, line 25 p 34) and US-B 5 367 044 and in the literature cited therein
• the polycarbonates used may also be intrinsically branched, in which case no branching agent is added in the context of the polycarbonate production
• An example of intrinsic branching is so-called frieze structures, as disclosed for melt polycarbonates in EP-A 1 506 249.
• chain terminators can be used in polycarbonate production.
• Additives such as, for example, UV absorbers and other customary processing auxiliaries, in particular mold release agents and flow agents, and stabilizers, in particular heat stabilizers and also antistatic agents, optical brighteners or colorants, may additionally be contained in the plastics.
• Colorants in the context of the present invention are organic and inorganic pigments and also dyes which are soluble in plastics.
• the composition Z is based on a cold stretchable plastic composition. This is particularly necessary if a production of a three-dimensionally deformed film element is carried out by high-pressure isostatic deformation at a process temperature below the softening temperature of the plastic.
• Suitable cold-stretchable plastics are mentioned, for example, in EP-A 0 371 425. It can be used both thermoplastic and thermosetting, at least partially transparent cold stretchable plastics. Preference is given to using cold stretchable plastics which have little or no resilience at room and service temperature.
• plastics are selected from at least one material from the group consisting of polycarbonates, preferably polycarbonates based on bisphenol A, polyesters, in particular aromatic polyesters, for example polyalkylene terephthalates, polyamides, for example PA 6 or PA 6,6 types, high-strength aramid Polyolides, for example films based on poly (diphenyloxide pyromellithimide), polyarylates, organic thermoplastic cellulose esters, in particular their acetates, propionates and acetobutyrates, are very particularly preferably used as plastics polycarbonates based on bisphenol A.
• polycarbonates preferably polycarbonates based on bisphenol A
• polyesters in particular aromatic polyesters, for example polyalkylene terephthalates, polyamides, for example PA 6 or PA 6,6 types
• high-strength aramid Polyolides for example films based on poly (diphenyloxide pyromellithimide), polyarylates, organic thermoplastic cellulose esters,
• the substrate A is a plastic molding, in particular a film or plate, which is composed of at least one cold stretchable plastic composition.
• Substrate A already has good scattering properties due to the presence of the conversion pigments K according to the invention in the composition Z in the concentrations according to the invention.
• the scattering properties can also be influenced by the optional addition of additional scattering additives.
• the scattering property can take place by internal structuring of the composition Z in the form of light-scattering particles such as glass beads, glass fibers, metal oxides, SiO 2 or minerals or organic scattering additives, for example grain-shell acrylates or blends of immiscible polymers, which are incorporated into the molding or Mold and / or the film / plate are incorporated.
• the particles act as scattering centers for the incident light and deflect it so that it strikes the surface of the plastic molding, in particular film / board, at a steep angle and is not subject to total reflection, but is coupled out.
• the same effect may have gas inclusions forming interfaces where the incident light is scattered.
• the particles may in turn also contain fluorescent substances.
• composition Z may contain further customary plastic additives which are known to the person skilled in the art, for example, from WO 99/55772, pages 15-25, EP-A 1 308 084 and from the corresponding chapters of the "Plastics Additives Handbook", ed. Hans Zweifel, 5th Edition 2000, Hanser Publishers, Kunststoff are known.
• Substrate B also preferably consists of a plastic, in particular of one or more of the abovementioned polymers, if appropriate additionally containing the listed additives.
• Another possibility of generating additional scattering properties in both substrate A and substrate B is the structuring of the surface of the substrates by light-scattering particles incorporated in the surface.
• the particles act as scattering centers on the surface and couple out the incident light.
• the surface of the substrates in particular of the substrate A, can also be structured by grooves, grooves, channels and / or holes.
• this type of surface structuring scattering centers are created on the surface.
• Lenticular structuring is also possible, in which the surface is provided with one or more lenticular elements.
• the inorganic or organic, light-emitting elements are completely or partially covered by the substrate A.
• the substrate A has the thickness d. It has now been found that an efficient conversion and homogeneous light distribution through the substrate A succeed if the following relationship exists:
• the percentages by weight always refer to the total composition, in this case to the total composition of substrate A.
• “Covering” or “covered” in the sense of the invention means, as already described, that the light used for the application radiates through the substrate A or the molded body with the conversion pigments and is partially color-converted.
• the substrate A can be mounted directly in front of or with a certain distance in front of the light-emitting element or in front of the substrate B with one or more cavities which are equipped with an electroluminescent element or one or more LEDs, preferably LED DIEs glued directly to the light-emitting element with a transparent adhesive / bonding agent or attached to a molded body or housing in which the light-emitting element is located, for example by gluing or mechanical fastening, or mounted on a printed circuit board or flexible printed circuit board the light-emitting element is located.
• Between the light emitting element (e.g., LED or LED DIE) and substrate A may be one or more substantially transparent adhesive layers, foil layers, or air.
• the substrate A can also be arranged partially or completely around the substrate B.
• the light-emitting element may be one or more LEDs or LEDs DIEs or else an electroluminescent element.
• the final color temperature of the light-emitting device is determined by the nature of the conversion pigment or the mixture of conversion pigments, the degree of filling of the conversion pigment, the geometric shape of the substrate A or the shaped body and the original emission wavelength of the light-emitting element. This color temperature is determined and is reproducible under the same process conditions.
• the conversion pigments K are first incorporated into the transparent or semitransparent plastics.
• the incorporation is carried out by known methods such as compounding or by jointly dissolving the conversion pigments with the polymer material and subsequent concentration.
• the substrate A and its plastic moldings or the substrate B and its plastic moldings with the conversion pigments K can be prepared by known processes, such as injection molding, extrusion, coextrusion, blow molding or deep drawing from the plastics containing the conversion pigments. Films can also be made from solvents by casting or other known coating methods. Also, laminates of a carrier and a film containing the conversion pigments can be used. Solutions of conversion pigment and the plastic may also be applied to a suitable substrate by means such as casting, printing, spraying.
• the particles are suspended in a solvent in a first step and applied to the surface of the substrate or substrates by mechanical aids or devices, such as a stamp or a printing press. The areas where the particles and the solvent touch the surface swell. Then allowed to evaporate the solvent.
• the substrate B or the substrate A can be tempered until the solvent has completely evaporated.
• the structuring of the surface of the substrate A and / or of the substrate B can also be effected by grinding, scratching, peeling, sawing, drilling, graining, punching, laser ablation, dot matrix printing or other mechanical processes which lead to a local deformation or change of the surface ,
• the surface can also be patterned chemically by etching with a solvent.
• the substrate A has as a film or as a film with integrated lenses preferably a thickness of 10 .mu.m to 3,000 .mu.m, preferably from 70 .mu.m to 1,500 .mu.m, more preferably 100 .mu.m to 1,000 .mu.m, most preferably 125 .mu.m to 750 .mu.m.
• the substrate A as an extruded plate or as an extruded plate with integrated lenses, preferably has a thickness of from 1,000 ⁇ m to 30,000 ⁇ m, preferably from 1,200 ⁇ m to 15,000 ⁇ m, particularly preferably from 1,500 ⁇ m to 10,000 ⁇ m.
• the inventive plastic composition Z can be used, for example, for moldings, sheets or films used in lamps equipped with LEDs, lighting devices, indoor and outdoor lighting, especially in the field of transport, eg in automobiles, aircraft, ships, as interior lighting of residential and Working rooms, in backlight units of LCD screens, in the field of trade fair and shop construction, in the furniture industry, for example, accent lighting in kitchens, bedrooms, etc. are used.
• the substrate A is produced from Z, which is used in the particularly white light-emitting device comprising the substrate B, which has at least partially on its surface one or more cavities, which are populated with LEDs or LED DBEs. in such a way that the substrate A according to the invention at least partially covers the side of the substrate B which has the cavities and may optionally be connected via an adhesive layer to the substrate B or the LEDs or LEDs located therein.
• the substrate B (1) has cavities (7) with e.g. blue LEDs or LED-DIEs (5).
• a transparent potting compound or adhesive layer (2) serves as a bonding agent between (1) and the substrate A (3), the conversion pigments (6), and protects the LEDs / LED DIEs (5).
• the substrate A (3) is in the form of a film (FIG. 1) or a film with focusing properties, e.g. Microlenses (8) ( Figure 3) formed.
• the layer (2) is made of air and the substrate A is mounted over brackets at a distance in front of the substrate B and the LEDs.
• the e.g. white LED light generating devices comprise a molded body (1) with cavities (7) and e.g. blue LEDs or LED DIEs (5) and a potting compound, plastic, ceramic or metal plate (4) for protection and thermal management.
• the transparent potting compound or adhesive layer (2) serves as adhesion promoter for the substrate A (3), which contains conversion pigments (6).
• the substrate A (3) is formed as a film ( Figure 2) or as a film with focusing properties (e.g., microlenses (8)) ( Figure 4).
• FIG. 5 Another embodiment is shown in FIG. 5, in which a shaped body (1) contains cavities (7) in which LEDs are seated.
• the molded body (1) consists of the composition Z and corresponds to the substrate A.
• the potting compound, plastic, ceramic or metal plate (4) serves as protection and for thermal management.
• a further embodiment of the invention is, for example, a device made of a plastic molded body which has LED's or LED's at least partially fitted on its surface, and a transparent or semi-transparent plastic film or plate which at least partially the side of the molded body having the cavities , Covered and which is optionally connected via an adhesive layer to the plastic molding, characterized in that the transparent or semi-transparent plastic film or sheet and / or the plastic molding containing conversion pigments evenly distributed.
• This device can as
• Lamp lighting device, light source for indoor and outdoor applications, in particular in the field of means of transport, eg in automobiles, aircraft, ships, as interior Lighting of living and working spaces, in backlight units of LCD screens, in the trade fair and shop construction, in the furniture industry, for example, accent lighting in kitchens, bedrooms, etc. are used.
• a method of making this device may be the following
• the cavities are equipped with LEDs or LED DBEs, which are electrically connected to each other,
• the transparent or semitransparent plastic film or sheet and / or the plastic molding contain evenly distributed conversion pigments.
• composition Z of the invention Components used for the preparation of the composition Z of the invention:
• Makrolon 3108 linear bisphenol-A polycarbonate of Bayer AG, Leverkusen with a melt volume flow rate (MVR) according to ISO 1133 of 6.0 cmVlO min at 300 0 C and 1.2 kg load, a Vicat softening temperature of 149 0 C at a load of 50 N and a heating rate of 50 0 C per hour according to ISO 306 and a Charpy notched impact strength of 80 kJ / m 2 at 23 0 C and a test specimen thickness of 3 mm according to ISO 179/1 eA).
• MVR melt volume flow rate
• a) conversion pigment F560 present as a yellowish fluorescent powder europium-activated alkaline earth orthosilicate having an average particle size d 50 of 13.4 microns, available from the company Leuchtstoffwerk Breitungen GmbH, 98597 Breitungen, Germany.
• the conversion pigment a) is characterized by further chemical elements as follows:
• conversion pigment F565, a present as a yellowish fluorescent powder europium activated alkaline earth orthosilicate having an average particle size d 50 of 12.1 microns, available from the company Leuchtstoffwerk Breitungen GmbH, 98597 Breitungen, Germany.
• the conversion pigment b) is characterized by further chemical elements as follows:
• Conversion pigment LP-7912 a europium-activated alkaline earth orthosilicate present as a yellowish fluorescence powder with a mean particle size d 50 of 12.1 ⁇ m, obtainable from the company Leuchtstoffwerk Breitungen GmbH, 98597 Breirungen, Germany.
• the conversion pigment c) is characterized by further chemical elements as follows:
• Polycarbonate component A and conversion pigment B were mixed together in the respective concentration ratios shown in Table 1 in powder form, melted and homogenized in the melt for 60 seconds.
• a mini-extruder of the DSM XPLORE 15 cm 3 Twin-Screw Micro-Compounder (DSM) was used at a melt temperature of 31O 0 C.
• the angle-dependent measurement of the scattered light was carried out on the platelets of thickness 1.5 mm produced by means of the DSM injection molding machine.
• a goniometer GON360 with spectrometer CAS 140B from Instrument Systems was used for this purpose.
• the lamp current of the light source was 8.5 A.
• the dashed plate was arranged perpendicular to the light source.
• the intensity of the light emerging linearly from the light source was measured perpendicular to the plate plane (position 0 °) and then the scattered light in a semicircular arc, encompassing measuring angle of 0 ° to 180 °, detected.
• To determine the relative Stray light intensities were then set in relation to the light intensities detected at the respective measurement angles with the intensity of the light measured at 0 ° (not scattered). The results of the test are shown in Tab.

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• 2009
  • 2009-08-28 JP JP2011525452A patent/JP2012502122A/ja active Pending
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  • 2009-08-28 WO PCT/EP2009/006250 patent/WO2010025876A1/de not_active Ceased
  • 2009-08-28 KR KR1020117007616A patent/KR20110050552A/ko not_active Ceased
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