EP-4736218-A1 - LIGHT-EMITTING DEVICE AND ILLUMINATION DEVICE

Abstract

The invention relates to a light-emitting device (1) comprising: at least one LED chip (3) for generating primary light (P) with a primary spectrum; and at least one conversion component (K i ) for converting the primary light (P) into secondary light (S i ) with a secondary spectrum that differs from the primary spectrum. The primary light (P) is emitted over a emission solid angle range (A) of the light-emitting device. The at least one conversion component (K i ) covers only a partial solid angle range (T i ) of the emission solid angle range (A), meaning that an emission spectrum of the light-emitting device (1) is dependent on the solid angle.

Inventors

• Andreev, Zhelio
• HERNANDEZ GOMEZ, Carlos Roberto
• KÖCK, Dominik
• Özgür, Harun

Assignees

• Würth Elektronik Eisos Gmbh & CO. KG

Dates

Publication Date

20260506

Application Date

20240627

Claims (16)

1. Patent claims 1. Light-emitting device, in particular LED package, comprising - at least one LED chip (3) for generating primary light (P) with a primary spectrum, wherein the primary light (P) is emitted over a radiation solid angle range (A) of the light-emitting device (1; 1a; 1b; 11), and - at least one conversion component (Ki; Kai) for converting the primary light (P) into a secondary light (S i ) with a secondary spectrum that differs from the primary spectrum, wherein the at least one conversion component (Ki; Kai) only covers a solid angle partial range (Ti) of the radiation solid angle range (A), so that a radiation spectrum of the light-emitting device (1; 1a; 1b; 11) is solid angle-dependent.
2. 2. Light-emitting device according to claim 1, characterized in that the radiation spectrum has different color valences in different solid angle sub-ranges (Ti).
3. 3. Light-emitting device according to one of the preceding claims, characterized by at least two conversion components (K i ; Ka i ) which cover different solid angle sub-ranges (Ti) of the emission solid angle range (A) and whose secondary spectra differ, in particular have different color valences.
4. 4. Light-emitting device according to claim 3, characterized in that different conversion components (K i ; Ka i ) have different light-converting materials and/or different concentrations of at least one light-converting material.
5. 5. Light-emitting device according to one of the preceding claims, characterized by an optically transparent encapsulation in which the at least one LED chip (3) is at least partially encapsulated.
6. 6. Light-emitting device according to claim 5, characterized in that the optically transmissive encapsulation is made of glass and/or an optically transparent resin, in particular silicone resin and/or epoxy resin.
7. 7. Light-emitting device according to claim 5 or 6, characterized in that the at least one conversion component (Ki; Kai) is embedded in the encapsulation of the at least one LED chip (3).
8. 8. Light-emitting device according to one of the preceding claims, characterized in that the at least one conversion component (Ki; Kai) is applied as a coating to a partial area of a surface of the at least one LED chip (3).
9. 9. Light-emitting device according to one of the preceding claims, characterized in that different solid angle sub-ranges (T i ) of the radiation solid angle range (A) are optically separated from one another, in particular optically shielded.
10. 10. Light-emitting device according to one of the preceding claims, characterized by at least one aperture (7) which is arranged between two solid angle sub-regions ( Ti ) for optical separation, in particular optical shielding, of the two solid angle sub-regions (Ti).
11. 11. Light-emitting device according to one of the preceding claims, in particular according to claim 8, characterized by at least two lenses (Fi) which are arranged such that they at least partially bundle light of respective solid angle sub-regions (Ti).
12. 12. Lighting device with at least one light-emitting device (11) according to one of the preceding claims.
13. 13. Lighting device according to claim 12, characterized by a mirror arrangement (12), in particular a micro-mirror array, wherein at least two mirrors (Mi) are assigned to different solid angle sub-ranges (T i ) of the emission solid angle (A) with different emission spectrum of one of the at least one light-emitting device (11).
14. 14. Lighting device according to claim 13, characterized in that that the at least one light-emitting device (11) has a radiation spectrum with different color valence in solid angle sub-regions (T), to which different mirrors (Mi) are assigned.
15. 15. Lighting device according to claim 14, characterized in that the color values of the different solid angle sub-areas (Tai) correspond to different primary colors (R, G, B, C, M, Y) of one or more color systems.
16. 16. Lighting device according to one of claims 12 to 15, characterized by several light-emitting devices (11) for generating the primary colors (R, G, B, C, M, Y) of at least two color systems.

Description

Light-emitting device and lighting device The present patent application claims the priority of the German patent application DE 102023206082.5, the content of which is incorporated herein by reference. The present invention relates to a light-emitting device, in particular an LED package. The invention also relates to a lighting device, in particular a lamp and/or a lighting device for a projector, for example for a head-up display, a beamer and/or data glasses, for example so-called smart glasses. Light-emitting devices, in particular LED packages, are known from prior public use. It is an object of the present invention to improve a light-emitting device, in particular to provide a light-emitting device that is particularly suitable for applications in which a direction-dependent radiation characteristic is desired, for example for ambient lighting. This object is achieved by a light-emitting device according to claim 1. The light-emitting device has at least one LED chip for generating primary light with a primary spectrum and at least one conversion component for converting the primary light into secondary light with a secondary spectrum that differs from the primary spectrum. The primary light is emitted by the LED chip emitted over a solid angle range of the light-emitting device. The at least one conversion component covers only a solid angle sub-range of the solid angle range, so that a radiation spectrum of the light-emitting device is solid angle-dependent. The light-emitting device, also called a light emitter, is in particular an LED package. The light-emitting device advantageously allows solid angle-dependent radiation characteristics to be achieved flexibly and easily, in particular to be adjusted. The solid angle-dependent radiation spectrum can in particular be generated without the need for several LED packages, in particular several LED chips and a complicated arrangement of the same. This means that the solid angle-dependent radiation spectrum can be achieved with little space requirement and low material costs. In particular with different colors depending on the solid angle, the light-emitting device is particularly suitable for ambient lighting. The emission spectrum is the spectrum of the light that the light-emitting device, in particular the LED package, emits outwards. The emission spectrum can be varied in different solid angle sub-ranges by means of the at least one conversion component. In solid angle sub-ranges without a conversion component, the emission spectrum can be dominated in particular by the primary spectrum. In a solid angle sub-range assigned to a conversion component, the emission spectrum is dominated in particular by the converted secondary spectrum. The emission spectrum differs from the emission spectrum of other solid angle sub-ranges in which other other conversion components or no conversion components are arranged. Depending on the solid angle, either the primary light and/or the secondary light of one or more conversion components can be emitted. Advantageously, the solid angle-dependent emission spectrum enables solid angle-dependent colors of the emitted light, in particular solid angle-dependent color gradients. In different solid angle sub-areas, respective colors and/or color transitions between different colors can be specifically generated. For example, light of different colors can be emitted in different spatial directions. For example, three or more different solid angle sub-areas with different emission spectra can be provided, in particular three or more solid angle sub-areas in which light of different colors is emitted. The more solid angle sub-areas with different emission spectra are used, the more different colors can be generated. Preferably, there are at least as many different solid angle sub-ranges as there are different colors to be produced. In addition, the light-emitting device is particularly suitable for supplying different components, in particular other components of a lighting device, with light of different spectra, in particular different colors. In particular, the radiation spectrum of different solid angle sub-ranges can be further modified and/or used independently of one another. For example, Different mirrors, light guides and/or other optical components can be assigned to different solid angle sub-ranges, which deflect, forward, detect and/or otherwise process the respective emission spectrum. The emission spectrum is preferably in the visible wavelength range, in particular between 380 nm and 780 nm. The emission spectrum can also include parts of the infrared range and/or UV range, depending on the application. The secondary spectrum of the at least one conversion component covers at least parts of the wavelength range covered by the emission spectrum. The primary spectrum can cover parts of the emission spectrum, in particular if no conversion component is arranged in individual solid angle sub-ranges, so that