RU2000678C1 - Flexible electroluminescent source of light - Google Patents

Abstract

Usage: the invention relates to electroluminescent light sources and can be used in household lighting fixtures. SUBSTANCE: source has a relief base with recesses for a phosphor placed between electrodes made of fibers. The fibers of the embossed base are placed along the axis of symmetry in a flexible sealed sheath made of a transparent dielectric material. At least the fibers are made of electrically conductive material. As the electrically conductive material, metal wire or polymer fibers can be used. One of the electrically conductive fibers can be coated with an insulator layer or made in the form of a rod. The remaining fibers can be placed around the rod. The fibers surrounding the rod can also form a mesh around it. The fibers of the embossed base can be made with the same or different cross-sectional areas and cross-sectional shapes. The fibers can be made with a variable cross-sectional area along the length. The surface of the electrically conductive fibers can be made reflective. 10 s.p. f-ly. 11 ill. 73 C

Description

The invention relates to the field of electrical engineering, in particular to electroluminescent light sources, and can be used in household lighting fixtures, for signal lighting, and the like.

A known flexible electroluminescent panel comprising electrodes and a phosphor-dielectric layer,

located between the electrodes.

A disadvantage of the known device is that the electroluminescent panel is a flat uniform light source, which limits its scope.

The closest in technical essence and the achieved result to the claimed device is a flexible electroluminescent light source.

consisting of fibers, at least one of which is made of a transparent dielectric, forming a relief base of the source with recesses for an electroluminophore placed between the electrodes.

A disadvantage of this device is its limited functionality as a source of electroluminescent radiation, which prevents the expansion of the range of lighting effects, since the known device is a flat uniform light source, has limited possibilities for bending it.

The purpose of the invention is to provide a linear light source with possible bending in an arbitrary direction relative to the axis of symmetry.

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ABOUT

This goal is achieved in that in the known flexible electroluminescent light source, consisting of fibers, at least one of which is made of a transparent dielectric, forming a relief base of the source with recesses for an electroluminophore placed between the electrodes, the fibers of the relief base are placed along the axis of symmetry in a flexible sealed enclosure made of a transparent dielectric material, at least two of which are made of electrically conductive material.

To achieve this goal, the electrodes are made of metal wire, and the electrodes in a relief base are made of polymeric material; at least one of the electrically conductive fibers of the embossed base is coated with an insulator layer, at least one of the fibers of the embossed base is made in the form of a rod, and the remaining fibers are placed to form a winding around it; the electrically conductive fibers of the embossed base form a grid around the rod; embossed fiber base is made with the same cross-sectional shape; at least one of the fibers of the embossed base is made with a sectional area variable along its length; fibers of the embossed base are made with different cross-sectional areas; the surface of the electrically conductive fibers of the embossed base is reflective.

In FIG. 1 shows a flexible electroluminescent light source in the form of a twist in section with two electrodes; figure 2

the same with four electrodes; on figs

- the same, with twisting in the form of a circular winding of one electrode around another; Fig. 4 is a general view of the electroluminescent light sources of the claimed construction of two different modifications with power units; Fig. 5b shows the emission spectra of various electroluminophores at different frequencies of the exciting voltage; Fig. 7 shows emission spectra of an electroluminophore ZnS-Cu (0.05%), Ml (0.35%) at different frequencies of a supply voltage of 200 V; Fig. 8 shows the dependence of light output on the value of the supply voltage at f - 1 kHz; Fig. 9 shows the dependence of the brightness In the luminescence of electroluminophores on the frequency f of the supply voltage 200 V; in FIG. 10 - volt-capacitance characteristic of samples of electroluminescent light sources of the claimed design, made on the basis of E-515 electroluminophore; on the

11 - frequency f dependence of brightness In the luminescence of the same samples.

The positions indicated are: 1,2 - electrodes; 3 - additional optically transparent filamentous dielectric; 4 - deepening of the surface relief of the twisting or braiding of the electrodes; 5 - electroluminophore with a dielectric binder in the recesses of the twist or weave relief; 6 - sealed transparent insulating sheath; 7 - a protective coating; 8 - source core without electroluminophore; 9 - source core coated with dielectric electroluminophore

5 binders; 10 - power terminals; 11 - power supply unit; 12 - electroluminescent filamentous source.

Flexible electroluminescent source of swog contains the following components

0 items.

The core of the light source formed by its elements consists of two or more electrodes 1. 2. electrically insulated between themselves by a dielectric material5, which can be made transparent. Electrical insulation can also be made in the form of a dielectric coating of one of the electrodes (with two electrodes in the core). Electrodes 1, 2 (or

0 one of them) can be made either in the form of a thin metal wire (or a bundle of thin wires), bending strength, or in the form of an electrically conductive thread of another material, for example, polymer, including from transparent.

The electrodes 1, 2 are twisted or woven together with the formation of a relief surface along the length of the twist or woven in the form of recesses 4 of the relief of the twist or

0 gossip.

In the recess 4 of the relief of the surface of the twist or gossip, i.e. in the region with the strength Н of the exciting electric field equal to 10 -105 V / cm,

5 is applied to the electrodes 1, 2. an electroluminophore 5 with a dielectric binder. The dimensions of the recesses of the relief of the surface of the twist or plexus impose restrictions on the maximum grain size of the filling electroluminophore 5. The optimal size of the recesses of the relief of the surface for applying the electroluminophore is achieved by selecting the thicknesses of the electrodes 1, 2, and an additional transparent dielectric 3 filamentous shape, as well as by choosing the pitch of their twisting .or gossip.

To provide the possibility of adjusting the parameters of the light flux and adjusting the pitch of the recesses of the relief

An additional dielectric 3 (one, two or more) filamentary shapes made of a transparent material can be placed on the surface of the twisting or braiding of the electrodes 1, 2 in the twisting or braiding of the electrodes of the core of the light source. The introduction of additional dielectrics 3, for example, in the form of optically transparent polymer filaments of various thicknesses, makes it possible to control the surface relief of twisting or weaving and increases the tensile strength of the final product.

One of the electrodes 1 or 2 (or a group of electrodes) can be installed linearly during twisting (Fig. 3), and the remaining electrodes (one or several) are placed to form circular winding around the rectilinearly mounted electrode (solid or with a certain step). In this case, the remaining electrodes can be made transparent and wound onto the first one, together with an additional (one, two or more) transparent dielectric 3 of a filamentous shape with the formation of an adjacent paired relief of the twisted surface of a spiral shape, and without it. The electrodes can also be wound onto a rectilinearly mounted electrode both in the forward and reverse directions to form a mesh coating, and an electroluminophore can be deposited on a rectilinearly mounted electrode.

To increase the degree of light retention, the surfaces of the electrodes can be made reflective, in particular mirror ones, for example, by vacuum spraying aluminum onto the surface of electrodes.

The electrodes 1, 2 and the additional dielectric 3 can be made of the same cross-section (circular, oval, in the form of a polyhedron, or in the form of an irregular shape), as well as an unequal cross-section, both in cross-sectional area and in its shape. The cross section of the electrodes 1, 2 and dielectric 3 can also be equal or variable along the length of the twist or braid of the core 8 of the light source.

The surfaces of the electrodes 1,2 and the additional dielectric can be made as smooth, for example, of circular cross section, constant over the entire length, and embossed, for example, with a periodic change in cross section along their length. The latter embodiment of the core elements allows the depth of the electroluminophore packing to be changed to deepen the surface relief of the source core.

The electrodes 1, 2 can also be made of a transparent conductive material, for example, of a conductive transparent polymer

The entire core 9, consisting of twisted or braided electrodes 1.2 with an additional dielectric 3, the surface relief of which is filled with an electroluminophore 5 with a dielectric binder, is placed in a sealed flexible shell b of tubular shape made of a transparent dielectric material.

An example of a specific embodiment, which is illustrated in Fig. 1. As electrodes 1, 2, a wire without electrical insulation with a diameter of 0.12 mm (electrode 1) and propod with an insulation with a diameter of 0.14 mm (electrode 2) were used. As an additional transparent dielectric 3, a polymer filament with a diameter of 0.10 mm was used. As a result of the twisting of the electrodes 1,2c with a polymer pit-insulator 3, a source core 8 is obtained, into which the recesses of the surface relief are formed by an electroluminophore 5.

Thus formed core 9 with a mosaic structure of electroluminescent coating is placed on a flexible, sealed transparent insulating shell 6 made of low pressure polyethylene 0.2 mm thick.

In another specific embodiment, two optically transparent / electrodes with a diameter of 1.2 mm and an electrically insulating layer with a thickness of 0.2 mm were used. twisted together with an optically transparent polymer monofilament with a diameter of 0.4 mm. In the recesses of the twists, an electro-keminofor is placed. The twist is coated with a 0.2 mm thick polyethylene layer. The obtained flexible electroluminescent light source makes it possible to create different shapes by bending it in any direction with a bending radius of up to 5 mm

When implementing multi-electrode structures (Fig. 2), which are characterized by increased light output due to an increase in the area of the emitted surface, the electrodes 1, 2 forming the core can both twist and weave, which leads to a diversity of the mosaic texture of the light-emitting surface of the source. Multielectrode light sources also have increased tensile strength,

The principle of operation of the device is based on the electroluminescence effect of the semiconductors of the zinc sulfide group, in accordance with which the electroluminescent layer (electroluminophore 5), fed by the energy of the electric field, emits a glow in a rock-boom or non-recombination way.

When voltage is applied to the electrodes 1, 2, the electroluminophore in the organic binder glows green, blue, yellow or red, depending on the brand. By mixing different brands of electroluminophore, you can get different shades of the full gamut of colors, including and white color.

The power supply of all modifications of the claimed object is provided both from an autonomous source using a converter, and using a network voltage converter.

The emission spectra of light sources based on ZnS electroluminophores are mainly determined by the type of activator introduced. The spectrum of luminescence of electroluminophors of this class is complex: in addition to the main luminescence band, it also has a clearly pronounced second, and sometimes a third of the band. The emission spectra of electroluminophores that can be implemented in the claimed object are shown in Figs. 5-7, where the dependence of the maximum of the emission spectrum on the frequency of the supply voltage is reflected. Figure 8 shows the light output as a function of the cast voltage at a frequency of 1 kHz. Brightness is the main operational characteristic of light sources. The dependence of the brightness B on the value of the applied voltage U is well approximated by a power function

In us

where 2 S 8. Fig. 9 shows a typical dependence of the luminosity of a declared object on the frequency of the supply voltage. The voltage and frequency characteristics of the samples of the claimed object are shown in Figs. 10, 11.

Claims (11)

1. A flexible electroluminescent light source consisting of fibers, at least one of which is made of a transparent dielectric, forming a relief base with recesses for the electroluminophore located between electrodes, characterized in that. in order to create a linear light source with the possibility of bending in an arbitrary direction relative to the axis of symmetry. the fibers of the embossed base are placed along the axis of symmetry in a flexible sealed sheath made of a transparent dielectric material, at least two of which are made of an electrically conductive material. 2. Light source pop. 1, characterized in that the electrodes are made of metal wire. 3. The light source according to claim 1, from which the electrodes in the embossed base are made of a polymeric material. 4. The light source according to claim 1, characterized in that at least one of the electrically conductive fibers of the embossed substrate is coated with an insulator layer. 5. A light source according to claims 1 to 4, characterized in that at least one of the fibers of the embossed base is made in the form of a rod, and the remaining fibers are placed around it. 6. The light source according to claim 5, characterized in that the electrically conductive fibers of the embossed base form a grid around the rod 7. A light source according to claims 1 to 4, characterized in that the embossed base is made of fibers with the same cross-sectional area. 8. The light source according to claims 1 to 7, with the fact that the relief base is made of fibers with various cross-sectional shapes. 9. A light source according to claims 1 to 8, characterized in that at least one of the fibers of the embossed base is made with a sectional area variable in length. 10. The light source according to claims 1 to 8, about l and h a-. and with the fact that the relief base is made of fibers with different cross-sectional areas 11. The source of light according to claims 1 to 10, on the basis of that. that at least the surface of the electrically conductive fibers of the rail 1 base is made reflective and // FigM I t N S e go o o sz st -J With 8, ) W ABOUT M-Y5 150lOO FIG. YU U in B, d / l /