WO2011054819A1

WO2011054819A1 - Luminous element

Info

Publication number: WO2011054819A1
Application number: PCT/EP2010/066635
Authority: WO
Inventors: Thomas Emde; Werner Pfeifer; Jörg KINDERMANN; Thomas Asperger
Original assignee: Emde Projects Gmbh
Priority date: 2009-11-04
Filing date: 2010-11-02
Publication date: 2011-05-12
Also published as: EP2496876A1; DE102009051962A1

Abstract

The present invention relates to a luminous element (10) comprising a hollow body comprising a layer or layer arrangement applied to the inner face of a dimensionally stable surface of rotation or in the surface of rotation itself, having at least one layer (12) emitting light, such as an OLED layer, at least one first electrode layer (23) and at least one second electrode layer (13), wherein means (15, 17) for contacting the electrode layers of the luminous element are further provided, as well as means for sealing the hollow body in a gas-tight manner. According to the invention, the means for contacting the electrode layers of the luminous element comprise at least one first contact plate (15) fitted in a cylindrical region (22) of the hollow body and extending over the cross section of said cylindrical region, the circumference thereof contacting the first electrode layer (13). A second contact plate (17) is preferably further disposed at an axial distance from the first contact plate, also extending over the cross section of the cylindrical region of the hollow body and contacting the circumference of the second electrode layer (23).

Description

Lamp

The present invention relates to a luminous means comprising a hollow body which, applied to the inside of a dimensionally stable surface of revolution, or in the surface of revolution itself has a layer or layer arrangement comprising at least one light-emitting layer, at least one first electrode layer and at least one second electrode layer, further comprising means for contacting the electrode layers of the luminous means are provided and means for gas-tight sealing of the hollow body.

A light source of the aforementioned type is described in Japanese Abstract 2004207081 A. The basic idea is to provide a light source, which is similar in its external shape (bulb shape) of a conventional light bulb and also in its base region of an incandescent lamp and thus compatible with a conventional lamp socket. However, an organic electroluminescent layer should serve as the light-emitting layer, with a layer structure such as that used in principle in OLEDs. Until now, OLEDs have only been known as flat planar illuminants, which as a result have a flat emission in only one direction. On the other hand, with an OLED illuminant as described in the Japanese publication, radiation in all spatial directions can be achieved and combined with the photometric advantages of the OLEDs (organic LEDs). However, technical difficulties arise in the production of a luminous means of the type described there. The organic electroluminescent layer is to be deposited on the inside by vacuum deposition or sputtering or by immersion in the hollow body. Subsequently, the second metallic electrode on the organic electroluminescent layer will also be deposited by vacuum deposition. However, this is technically not feasible, since due to the large heat development in the hollow body in the deposition of the metallic electrode layer, the heat-sensitive organic layer would be impaired. Another problem in the production of such a luminous means is the gas-tight sealing of the base region and the contacting of the two electrode layers, which as a rule have only a very small layer thickness. In Japanese writing, a kind of plug is inserted into the neck of the glass bulb, which is to seal in the glass and must be made of an insulating material, probably made of plastic. Through this plug through two pin-like contacts are passed, which contact at one end in each case one of the electrode layers of the layer arrangement on the glass body and which are in each case at the other end in contact with areas of the lamp cap. It is not apparent from the document, as it should be technically possible, on the one hand introduce the stopper gas-tight in the neck of the glass bulb and on the other hand to connect the pin-like contacts electrically conductive with the thin electrode layers in the interior of the glass bulb.

A similar prior art as the previously described document is disclosed in EP 1 448 026 A1. There is a mostly hemispherical glass body inside with a

Layer sequence of two electrode layers and a light-emitting layer provided and sealed in its open base area by a kind plate to the outside moisture-tight. The vitreous can also have a pear shape. Two conductive wires extend through the plate and are each conductively connected in the interior of the hollow body with one of the two electrode layers. The glass body and the plate can be connected to each other via a binder such as a synthetic resin. When the conductive wires extend through the plate, it must be made of an insulating material such as plastic. Even with this known solution, effective mass production of the described illuminant is hardly imaginable. On the one hand, the plate must be connected to the glass body permanently solid and gas-tight and on the other hand, the wire-shaped contacts with the glass body usually very thin layers must be electrically connected. This can not be realized at the same time. If, however, in the first step, the plate is gas-tightly connected to the glass body, the plate must be opened again for passing the contacts, so that then a new seal is necessary. In addition, then the precise contacting of the layers is difficult.

DE 957 249 B describes an electroluminescent lamp having a bulb shape similar to a conventional incandescent lamp, in which a glass bulb is provided with a transparent conductive coating on which a layer of a copper-activated zinc sulfide is applied. On this layer, a modified alkyd resin is applied as insulating material, which in turn applied to a conductive metallic layer of aluminum is. Such zinc-sulfide-based electroluminescent layers are not comparable in their photometric properties to organic light-emitting diode layers (so-called OLEDs). In this known illuminant, a glass bulb is inserted into a socket and at this the piston neck is attached with a putty. The piston is closed here via an integral glass presser, through which two wires are passed for contacting. These wires are each connected to leaf springs, which in turn each touch one of the conductive electrode layers of the layer arrangement on the piston. Since in this known light source the cavity of the piston is closed by a squeezing foot likewise made of glass, a melting connection of the glass material in the connection area between the piston and squeezing foot must take place after coating the inner surface of the piston, which requires high temperatures in which organic Light-emitting diode layers would be destroyed. Even in the application of the layers of the layer structure in the interior of the piston methods are already being used, which would destroy an OLED layer due to the temperatures occurring and are therefore suitable only when using a phosphor layer based on zinc sulfide.

Object of the present invention in view of the prior art is to provide a lamp of the type mentioned, in which a technically feasible solution for contacting the inner electrode layers of the hollow body and the gas-tight encapsulation of the opening of the hollow body is given.

The solution to this problem provides a light source of the type mentioned above with the characterizing features of claim 1. Further advantageous features emerge from the dependent claims and the embodiments and examples described below. It is understood that the embodiments are not restrictive; Within the scope of the independent claims, a person skilled in the art can also arrive at an object according to the present invention by taking into account individual features of the feature combinations described below. The present invention claims a luminous means in which the means for contacting the electrode layers of the luminous means comprise at least one first contact plate which is fitted over the cross section of this cylindrical region and fits into a cylindrical region of the hollow body, contacting a first electrode layer at its circumference.

Unlike the prior art described above, it is therefore such that at least one contact plate is used instead of contact pins. This at least a first Contact plate is dimensioned so that it can be fitted into the cross section of the cylindrical portion of the hollow body, so that over the entire circumference of the round contact plate results in an electrically conductive contact with one of the electrode layers of the light-emitting device. On the one hand, this geometry ensures reliable contacting of the electrode layer during the production of the luminous means. At the same time, it is also possible to close the opening to the cavity coated inside with the light-emitting layer via the contact plate and to protect the layers of the layer arrangement that are sensitive to oxygen and humidity in this way. This solution thus makes it possible in an elegant manner to simultaneously close the cavity during the production of the luminous means in one operation and to establish contact with the electrode layer on the inner surface of the hollow body. An additional plate for closing the cavity is no longer necessary.

According to a preferred development of the task solution according to the invention, a second contact plate arranged at an axial distance from the first contact plate is furthermore preferably provided, which likewise extends over the cross section of the cylindrical region of the hollow body and contacts a second electrode layer on its circumference. The second contact plate can be arranged at an axial distance from the first contact plate, likewise extends over the cross section of the cylindrical region of the luminous means and contacts the second electrode layer on its outer circumference. For example, this makes it possible to design the luminous means such that the first contact plate makes contact with an inner electrode layer of the luminous means which terminates approximately in its region, and the second contact plate forms an outer electrode layer of the electrode which extends beyond the inner electrode layer in the cylindrical region of the hollow body Hollow body contacted.

According to the invention, either the first contact plate and / or the second contact plate should each close an opening of the hollow body corresponding to the cross section of the cylindrical region in a gastight manner. As a rule, this is already done by the first contact plate facing the hollow body. It is particularly preferred that the first contact plate and / or the second contact plate consists of a metallic material and is soldered at its periphery with the cylindrical portion of the hollow body. The hollow body is preferably made of glass, a glassy or ceramic material. Technically, it is possible by special methods to produce a solder joint between a material pair of, for example, glass / metal. This does not require too high a temperature, so that the moderate heating in the region of the solder joint between the contact plate on its outer circumference and the glass material of the hollow body does not impair the function of the light-emitting layer in the interior of the hollow body. By such a solder joint, the contact is made and at the same time the interior of the hollow body effectively and permanently protected against the influence of oxygen and moisture from the surrounding atmosphere.

A preferred variant of the task solution according to the invention provides that the first contact plate and / or the second contact plate made of glass or a ceramic material except for an outer edge region comprising a metallic material or consists of a metallic material, said outer edge region of the first Electrode layer or the second electrode layer contacted. In this case, therefore, only in the edge region of the contact plate, a metal layer is present, which contacts an electrode and / or serves as a hermetically sealed connection point between the neck of the hollow body and the contact plate. Instead of a metal / glass soldering would then in the production, for example, a glass-metal-glass soldering possible for the preparation of the compounds. This may be advantageous in terms of a greater thermal stability of the connection region, since glass and metal have different thermal expansion coefficients. The resulting in the connection area thermo-mechanical stresses are reduced by reducing the metallic content.

Within the scope of a preferred development of the present invention, it is provided that the light-emitting layer or the light-emitting region of the hollow body comprises an organic light-emitting diode (OLED) layer and / or nanoscale light-emitting structures, in particular quantum dots.

An exemplary constructional variant of the present invention provides that at least one contact pin, which is electrically conductively connected to the first contact plate, extends through the second contact plate approximately in the axial direction of the cylindrical region, wherein the passage region is electrically opposite to the second contact plate is isolated. The first contact plate can thus consistently close the cross section of the remaining opening of the hollow body. The second contact plate, which preferably extends approximately parallel to and at a distance from the first contact plate, also essentially closes off the cross section of the opening or extends over the entire cross section of the cylindrical region, this only breaking through the contact pin of the first contact plate is, resulting in only a relatively small opening results. This small opening is unproblematic in the production, since the interior of the hollow body is already closed by the first contact plate.

From the contact plates then, for example, each contact pins go out, with the contact pin extending from the first contact plate to a contactable from the outside first contact element in a base region of the bulb and, for example, a second contact pin is provided which is electrically conductive with the second contact plate is connected and extending from the side facing away from the hollow body of the second contact plate, starting from a second contact element which can be contacted from the outside in a base area of the luminous means.

It is furthermore preferred that the first contact plate makes contact with an inner electrode layer of the luminous means which terminates approximately in its region, and the second contact plate makes contact with an outer electrode layer of the hollow body which extends beyond the inner electrode layer in the cylindrical region of the hollow body. Both electrode layers can thus end in each case on a circulating in the cylindrical portion of the hollow body circumference, so that a deposition of the layer in the production of the light source is technically easier than in a circumferentially asymmetrically deposited layer, as in the aforementioned state of Technique is used.

In the present application, the term "surface of revolution" is understood to mean the surface of a body of revolution in the sense of the mathematical definition that results from rotation of a generating line about an axis of rotation. Examples of such rotary bodies are sphere, cylinder, torus, ellipsoid, rotational bodies derived therefrom and those with more complex shapes. The light-emitting structures are arranged following the shape of this body of revolution and the light is emitted to the outside.

The surface of rotation is dimensionally stable and is therefore designed in its shape in the function of a carrier of the lamp. According to the invention, it is possible to use a support which is neutral for the photometric function and is coated, for example, with one or more functional layers. But you can also assign the carrier itself another essential for the bulb function. For example, the carrier itself can assume optical properties (light scattering, refraction of light, reflection, etc.) or be current-conducting and thus act, for example, as an electrode. The carrier may also be multilayer and have a more complex layer structure with multiple functions. You can either provide this with the functional layers after the production of the carrier, However, it is also possible, for example, to produce a support which already encloses the light-emitting structure or layer during production.

It is preferably provided that the illuminant emits visible light having a color rendering index (CRI value) of the wavelength-dependent intensity distribution to that of the sunlight of at least 80, preferably at least 90, particularly preferably at least 95.

Advantageously, the luminous means according to the invention has at least two, preferably 3-5, particularly preferably 4 series of successive excitation layers for the electrically excited light emission. The layer sequence is continuous and contacted with an anode layer, preferably an optically transparent ITO anode layer of indium oxide and tin oxide, beginning and finally with a cathode layer. As a carrier is preferably used in a luminous means according to the invention a largely and / or completely closed hollow body, which may for example consist of glass, plastic, ceramic, metal, combinations of these materials or other suitable material. The support material may be partially translucent, but this is not absolutely necessary. For example, the carrier can also consist of an opaque metal or ceramic, in which case at least one further layer in which the light-emitting structures are located can be applied externally to the carrier, which is then at least partially transparent or translucent. In this case, the carrier thus has a pure carrier function. However, the carrier may also already contain the light-emitting structures. The carrier may for example also be or comprise a prismatic foil and thus assume optical properties. Such a prism sheet can for example also be applied to a non-transparent support. A plastic material such as a plastic film may already contain the light-emitting structures. The carrier may also consist of an electrically conductive material and thus assume the function of one of the electrodes, for example.

The support may for example also be a one-sided or even double-sided open rotation body, such as a pipe, an open cone, truncated cone (luminous lampshade) a partial sphere or the like. Such a rotation body, which is initially open on one side or on both sides, can be closed, for example, in a later step of the production method, if it requires the function, for example, against the nanoscale light-emitting structures against external influences such as oxidation, moisture, etc. to protect. The rotationally symmetrical body may also have one or more open points, perforations or lattice structures, possibly only in partial areas.

In a luminous means according to the invention, the hollow body in its light-emitting region preferably consists of glass or a suitable plastic or the hollow body comprises at least one layer of glass or plastic, in particular a thermoplastic or thermosetting plastic, for example at least one processable by blow molding or deep drawing Plastic selected from the group consisting of acrylonitrile-butadiene-styrene (ABS), polyamide (PA), polylactate (PLA), polymethylmethacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene (PE), polypropylene ( PP), polystyrene (PS), polyether ketone (PEEK) and polyvinyl chloride (PVC) or the like.

In the case of a luminous means according to the invention, the interior of the rotary hollow body is as a rule closed gas-tight and / or optionally filled with a protective medium, more preferably a non-oxidizing gas.

In a luminous means according to the invention, for example

Radiation coupling-out, in particular scattering, structures may be provided on an outside radiation exit side in order to increase the proportion of the light emitted to the outside from the rotation body.

A luminous means according to the invention thus preferably comprises the following components: a support designed as a dimensionally stable rotation surface, structures emitting light, and visible light arranged at least in regions to a light outcoupling side of the support out coupling structures. The light emitting structures may be in, on or on the carrier. The visible light generated in this way is then coupled out of the carrier by the light coupling-out structures and emitted, for example approximately in the direction of the surface normal to the curved surface of the carrier. That is usually the radiation of the decoupled light takes place at a light source with trained as a rotational body carrier to the outside.

The light-emitting structures can, for example, be applied on the inside to the surface of revolution serving as a support.

The light-outcoupling structure can be, for example, an optically outcoupling film. This can for example be selected from the group of films consisting of scattered foil, prism foil, horizontal lenticular foil, vertical lenticular foil, Fresnel lenticular foil, prism grid foil.

In the case of a luminous means according to the invention, light sources based on organic light-emitting diodes (OLEDs), for example, can also be provided on or in the support, forming a light-emitting layer which, for example, can already be applied in advance to the inside of the dimensionally stable surface of rotation serving as support or else the light emissive layer and / or an electrode layer is located in the substrate itself. For the electrical excitation of the organic light emitting structures, a low voltage can be used, as a voltage source, for example, serves a controllable from 5 to 50 volts power source.

In a luminous means according to the invention, for example, at least one of the layers essential for the function can be applied to the inner surface of the hollow body serving as a carrier by a spraying process in which a spray head moves into the hollow body. Preferably, the application of at least one layer by "organic vapor phase deposition", wherein, for example, the substance is transported in a Schleppgasatmosphere in the vapor phase in the interior of the hollow body and then deposited on the surface to be coated of the hollow body controlled by cooling.

In the case of a luminous means according to the invention, for example, substantially all of the available inner surface or only a defined partial surface of the carrier designed as a hollow body can be covered with a single-layer or multi-layer arrangement of the layers essential for the function of the organic light-emitting diode.

In the case of a luminous means according to the invention, at least one second electrode providing indirect contact and / or excitation radiation can be arranged, for example, at a distance from the inner surface of the hollow body in the cavity separately from at least one layer arrangement.

An illuminant according to the invention may, for example, also have a complex layer structure of more than three layers. A lighting device according to the invention may, for example, the outer basic shape of a conventional lamp, in particular an incandescent lamp, fluorescent tube, bulb lamp, ball lamp or candle lamp so that it is compatible with and compatible with a conventional illuminant.

In a luminous means according to the invention, for example, the hollow body may have the shape of a ball or a ball shape derived from the spherical shape and molded neck area (in particular piston shape, candle shape, pear shape) and the aforementioned cylindrical area in which the contact plates are located in the Cross section (relative to the hollow body itself) tapered neck portion of the hollow body.

Alternatively, in a luminous means according to the invention, for example, the hollow body may have approximately the shape of a cylinder or a tubular shape and at one end a lamp base or at both ends in the frontal areas each a lamp base with contact means for external electrical contacting (in a version) may be provided wherein the aforesaid cylindrical portion in which at least one of the contact plates is located is a portion to be closed at one end or at both ends of the hollow body, and in which case the cylindrical portion may also have the same diameter as the hollow body itself ,

It is advantageous if, for example, the light-emitting structures are arranged in an optically substantially transparent medium, which may have, for example, up to 90% transparency, if appropriate also, for example, up to 99% transparency, and which serves as support for these structures.

With, for example, about 90% optical transparency, a medium, despite a certain loss rate, can already be considered as a carrier for illuminants, in which brightness and efficiency are the essential goals.

With, for example, 99% transparency, lighting systems become accessible in which a given light mixture and intensity is radiated very precisely, which is particularly recommended for varied, daylight-proof illumination.

The present invention furthermore relates to a method for producing a luminous means of the aforementioned type with the features of claim 14.

This comprises, for example, the steps of first producing a hollow body made of glass, plastic, ceramic, metal, a combination of these materials or another suitable material, which is closed except for one or more relatively small openings in relation to the surface of the hollow body in the next ar- Beitsschritt serving as a carrier inside of the hollow body is provided with one or more light-emitting layers and that finally the remaining (s) openings of the hollow body is closed gas-tight by means of at least one contact plate. According to the invention, furthermore, at least one further layer is applied to the carrier on the inside and / or outside, which has light-scattering, light-deflecting, reflective or light-color-changing properties and overlaps at least with a partial area of the previously coated inner surface of the hollow body. If, according to a preferred development, an optically decoupling film is provided, this film layer can be applied, for example, first as a varnish, liquid prepolymer mixture or elastic film, preferably with an adhesion-promoting lower-layer component having optically identical properties, by at least one of the measures selected from US Pat Group consisting of drying, thermal polymerization, photochemical polymerization, thermal curing connected to the substrate and finally formed on the exposed surface to one of the above types of film.

Such a film may, for example, be or will be provided at least in regions with specific wavelength-reflective or wavelength-converting structures.

Furthermore, according to the invention, for example, at least one further layer can be applied at least in regions to the surface of the hollow body in front of an outer electrode layer which is opaque, light-reflecting, directing light, changing the light color or light-scattering, or the outer electrode layer can be at least in regions opaque, light-reflecting or light-scattering be formed, or in the cavity may be arranged additional light-directing, light-scattering, light-reflecting or light-color changing elements.

In the manufacture of a luminous means according to the invention, the creation of the

Layer structure in the light-emitting region of the rotating body, for example, at least one layer and / or the nanoscale, luminescent structures are formed by thermolysis of gas-supported precursor compounds in a Schlegtgasstrom on a heated contact surface and then passing the gas containing the Thermolyseprodukte over the cooled - preferably already in the same way preparatory layers provided - vehicle surface. Hereinafter, the present invention will be explained in more detail by means of embodiments with reference to the accompanying drawings. Showing:

1 shows a schematically simplified sectional view through a lighting means according to a first exemplary embodiment of the present invention; Figure 2 is an enlarged sectional view of a detail through the lamp according to Figure 1;

3 shows a schematically simplified sectional view through a lighting device according to a second alternative exemplary embodiment of the present invention.

Reference is now made to Figure 1 and with reference to an exemplary embodiment of the present invention will be explained. In this example, the generally designated by the reference numeral 10 illuminant has approximately the shape of a conventional incandescent lamp. Thus, a trained as a hollow body rotational body is present, which is oval or ellipsoid in longitudinal section and tapers in a lower neck area in cross-section. This tapered portion is referred to in the present application as a cylindrical portion 22 and is connected to the convex curved pear-shaped hollow body usually in one piece. The hollow body with the integrally formed cylindrical region 22 can be formed, for example, from glass or plastic by means of known methods. The cylindrical neck region 22 is then adjoined by a base region 20, which may be designed as a screw base, plug-in base or the like, for example, like a conventional lamp base.

After the formation of the hollow body of this is coated by means of suitable methods on its inside with the necessary for the photometric function layers. For example, it is possible to use a carrier 11 consisting of glass, which is coated on the inside with a first transparent electrode layer 23 (see also FIG. 2) such as, for example, indium tin oxide (ITO). On the inside of the thus coated carrier 1 1, a layer or layer arrangement 12 (with several layers) is applied, which contains the light-emitting material, for example OLED (organic LED layer). To this

Coating is again inside a second electrode layer 13 is applied, which in the case of the present embodiment, the innermost layer of the layer sequence represents. In order to increase the proportion of light radiated outwards from the hollow body, the carrier 11 has on the outside a light-coupling-off layer 14. This light-outcoupling layer 14 can be, for example, a lens film or prism sheet which decouples the light from the glass or plastic carrier layer due to light scattering.

In Figure 1 it can be seen further that the hollow body in the cylindrical portion 22, (which could also be referred to as the neck region), a remaining cross-section, for example, has a round opening. In order to protect the inside of the carrier OLED layer 12 against moisture and oxygen, this opening is sealed gas-tight in the neck region of the hollow body, that is sealed. Previously, a protective gas can be filled in the interior of the hollow body. The closing of the opening takes place by means of a first contact plate 15, which is fittingly inserted into the opening in the neck region of the hollow body. This first contact plate 15 is for example made of metal and is soldered around after insertion at its outer periphery around with the glass body of the hollow body. By this solder joint, a gas-tight connection at the periphery of the contact plate 15 between the material pair metal / glass is achieved. At the same time, the metallic contact plate 15 contacts on its outer circumference the inner electrode layer 13 (cathode layer), which extends into the neck region of the hollow body and can end approximately at the level of the contact plate 15.

As can further be seen in FIG. 1, a second metallic contact plate 17 is arranged spaced apart and approximately parallel to the first contact plate 15, which is likewise inserted into the round opening in the neck region of the hollow body and further away from the center of the pear-shaped cavity of the hollow body This second contact plate 17 contacts on its outer circumference the outer electrode layer 23 (see also FIG. 2) (anode layer made of ITO), which can be seen in the neck region of the hollow body via the inner electrode layer 13 extends beyond.

Starting approximately at right angles from the first contact plate 15, a first contact pin extends approximately in the axial direction with respect to the cylindrical portion 22 as far as the contact element 21 in the base region of the luminous means, this contact pin 16 providing an electrically conductive connection between the first contact plate 15 and the contact element 21 at the end of the base portion 20 manufactures. This first contact pin 16 is guided through the second contact plate 17, wherein in the implementation of an electrical insulation against the second contact plate 17 is provided. From the second contact plate 17 extends towards the cavity side facing away also a contact pin 18 which contacts a second contact element 19 in the base region 20 of the lamp. As in the case of a conventional luminous means, the two contact elements 19 and 21 can produce electrical contact to a lamp socket in the outside, into which the base region 20 of the luminous means 10 according to the invention is screwed.

Figure 2 shows an enlarged detail of the wall of the hollow body from which one can see the layer sequence even more clearly. There is a carrier layer 1 1, for example made of glass, on the outside of the light-coupling layer 14 is located. On the inside, the carrier layer 11 is coated with the first electrode layer 23 (for example anode layer made of ITO). This is followed inward by the OLED layer 12, which itself may have a multilayer structure. Finally, the second electrode layer 13 (cathode layer) closes inwards as the innermost layer. The light is emitted as indicated in Figure 2 by the substantially transparent in the example carrier 1 1 out through the light auskoppelnde layer 14 to the outside, approximately in the direction of the surface normal of the curved surface of the hollow body of the bulb 10th

By way of example, the example describes a luminous means 10 according to the invention with a comparatively simple design. Of course, the layer structure of the rotating body can be significantly more complex in both embodiments. For example, in addition to the layers mentioned, p-doped hole-line layers (HTL), n-doped electron-conducting layers (ETL), high-energy radiation-reflecting layers for protecting the light-emitting layer against UV radiation or layers with other optical functions, in particular light-scattering, light-directing, reflective Layers or layers with the light color changing properties can be provided. Furthermore, it is also possible for there to be a plurality of layers with luminescent nanoscale structures which overlap over the surface of the rotation body or even in regions. An exemplary alternative embodiment of the present invention will be explained below with reference to FIG. As can further be seen in FIG. 3, the basic structure of the luminous means according to the invention is similar to the exemplary embodiment described above. Reference is made to the above description relating to the embodiment of Figures 1 and 2 in this regard. The first upper contact plate 15 can also consist of a metallic material here, for example. This contact plate contacts on its outer circumference a first inner electrode layer 13 of the layer structure of the luminous means 10 designed as a rotary body. Also in this variant, a second contact plate 17 is arranged at a distance and approximately parallel to the first contact plate 15, which is also inserted into the round opening in the neck region of the hollow body and further away from the center of the pear-shaped cavity of the hollow body, corresponding to the distance to first contact plate 15. This second contact plate 17 contacts on its outer circumference the outer electrode layer 23 (see also FIG. 2) (anode layer of ITO), which extends beyond the inner electrode layer 13 in the neck region of the hollow body. Unlike the exemplary embodiment described above, the second contact plate here consists predominantly of a vitreous or ceramic material. Only in an outer annular edge portion 17 a is this second contact plate made of a metallic material. In the small illustration at the bottom right of FIG. 3, the second contact plate 17 is shown once more in a schematic plan view. The contacting 16 for the first contact plate 15 may, for example, extend centrally through the second contact plate 17, whereby additional insulation is not necessarily necessary if the second contact plate 17 is made of an insulating material in this area. The annular edge region 17 a can preferably be conductively connected by soldering to the outer electrode layer 23. Since a similar material pairing is present in the connection area, the thermo-mechanical stresses in the connection area are reduced. The connection of the glassy or ceramic portion of the contact plate 17 with the metallic edge portion 17 a can also be prepared in advance, for example by soldering before the contact plate 17 is inserted, which has the advantage that the connection is not made in close proximity to the layer structure of the bulb and therefore there is no warming there.

Starting from the first contact plate 15 approximately at right angles, a contact pin also extends in this embodiment approximately in the axial direction with respect to the cylindrical portion 22 to the contact element 21 in the base region of the lamp, wherein the contact pin 16 is an electrically conductive connection between the first contact plate 15 and a direct current regulator 24 which in turn is in electrical contact with the contact element 21 at the end of the base region 20 and with the contact element 19 in the threaded region of the socket, ie the AC contacts of the light source. From the DC regulator 24 also go as seen in Figure 3 electrical connections to the annular metallic edge portion 17 a of the second contact plate 17th

As in the case of a conventional illuminant, in this variant the two contact elements 19 and 21 can also externally make electrical contact with a lamp socket in which the base portion 20 of the luminous means 10 according to the invention is screwed and thus receive AC power from the grid, which is then converted by means of the DC regulator 24 into DC for supplying the contact plate 15 and the edge portion 17 a of the contact plate 17.

LIST OF REFERENCE NUMBERS

10 bulbs

1 1 carrier layer

12 light-emitting layer

13 cathode layer

14 light decoupling layer

15 first contact plate

16 contact pin

17 second contact plate

17 a outer edge area

18 second contact pin

19 first contact element in the socket area

20 base area

21 second contact element

22 cylindrical area (neck area)

23 anode layer

24 DC regulator

Claims

PATENT APPLICATIONS

1 . Illuminant, comprising a hollow body, which, applied to the inside of a dimensionally stable surface of revolution, or in the surface of revolution itself has a layer or layer arrangement comprising at least one light-emitting layer, at least one first electrode layer and at least one second electrode layer, further comprising means for contacting the electrode layers of the luminous means are provided and means for gas-tight sealing of the hollow body,

characterized in that the means for contacting the electrode layers of the luminous means in a cylindrical portion (22) of the hollow body fitted over the cross section of this cylindrical portion extending first contact plate (15) which contacts at its periphery the first electrode layer (13).

2. Lamp according to claim 1, characterized in that the means for contacting the electrode layers comprise at least one arranged at an axial distance from the first contact plate second contact plate (17) which also extends over the cross section of the cylindrical portion of the hollow body and at its periphery a second electrode layer (23) contacted.

3. Lamp according to claim 1 or 2, characterized in that the first contact plate (15) and / or the second contact plate (17) each gas-tightly closes a the cross section of the cylindrical portion (22) corresponding opening of the hollow body.

4. Lamp according to one of the preceding claims, characterized in that the first contact plate (15) and / or the second contact plate (17) made of a metallic

Material consists and is soldered at its periphery with the cylindrical portion (22) of the hollow body.

5. Lamp according to one of claims 1 to 3, characterized in that the first contact plate (15) and / or the second contact plate (17) made of glass or a ceramic

Material is up to an outer edge region which comprises a metallic material or consists of a metallic material, said outer edge region of the first electrode layer (13) or the second electrode layer (23) contacted.

6. Lamp according to one of the preceding claims, characterized in that at least the cylindrical portion (22) of the hollow body made of glass, a glassy or a ceramic material.

7. Lamp according to one of the preceding claims, characterized in that the hollow body has a piston shape, candle shape or pear shape and the cylindrical portion (22) is a tapered in cross-section neck portion of the hollow body.

8. Lamp according to one of claims 1 to 6, characterized in that the hollow body has a substantially cylindrical shape or tubular shape and the cylindrical portion is a region to be closed at one end or at both ends of the hollow body.

9. Illuminant according to one of the preceding claims, characterized in that the light-emitting layer (12) of the hollow body comprises an organic light-emitting diode (OLED) and / or nanoscale light-emitting structures, in particular quantum dots.

10. Lamp according to one of claims 1 to 9, characterized in that at least one contact pin (16) which is electrically conductively connected to the first contact plate (15) through the second contact plate (17) through approximately in the axial direction of the cylindrical Area (22), wherein the passage area opposite the second contact plate is electrically insulated.

1 1. Illuminant according to one of claims 1 to 10, characterized in that the contact pin (16) starting from the first contact plate (15) to a contactable from the outside contact first contact element (21) in a base region (20) of the lighting means (10). extends.

12. Lamp according to one of claims 1 to 10, characterized in that at least one second contact pin (18) is provided, which is electrically conductively connected to the second contact plate (17) and starting from the side facing away from the hollow body of the second contact plate an externally contactable second contact element (19) in a base region (20) of the lighting means extends.

13. Lamp according to one of the preceding claims, characterized in that the first contact plate (15) contacts an approximately in their area ending inner electrode layer (13) of the lamp and the second contact plate (17) in the cylindrical region (22) of the Hollow body over the inner electrode layer (13) extending outward outer electrode layer (23) of the hollow body contacted.

14. A method for producing a luminous means, in particular according to one of the preceding claims, comprising the steps of first producing a hollow body made of glass, plastic, ceramic, metal, a combination of these materials or another suitable material, with the exception of one or more in relation to the surface of the hollow body relatively small openings is closed, that in the next step serving as a carrier (1 1) inside of the hollow body with one or more light-emitting layers (12, 13, 23) is provided and that finally the remaining ^) Opening (s) of the hollow body by means of at least one contact plate (15, 17) is sealed gas-tight.

15. The method according to the preceding claim, characterized in that the hollow body at least in the region of its opening made of glass, a vitreous or ceramic material and at least one existing of a metallic material contact plate (15, 17) at its periphery with the inner circumference of the hollow body is soldered in the region of the opening.