TWI404239B - Illuminating apparatus - Google Patents

Abstract

An illuminating apparatus includes at least one light-emitting diode, a first film being installed on light emitting side of the at least one light-emitting diode, a second film attached to the first film. The first film doped a first phosphor therein. The second film doped a second phosphor therein. The first phosphor and the second phosphor are excited by the light from the at least one light-emitting diode and converts wavelength of the light.

Description

Lighting device

The invention relates to a lighting device.

LED (Light Emitting Diode) is widely used in the field of illumination because of its high brightness, low operating voltage, low power consumption, easy matching with integrated circuits, simple driving, and long life. For details, see Joseph Bielecki et al., Literature 2007 IEEE, 23rd IEEE SEMI-THERM Symposium, Thermal Considerations for LED Components in an Automotive Lamp. Light-emitting diode system A semiconductor component that converts current into light of a specific wavelength range.

The conventional white light emitting diode module generally has two kinds of light emitting modes: one is to mix the light emitted by the red, green and blue light emitting diodes to obtain white light; the other is to use a blue light emitting diode or The ultraviolet light emitting diode is matched with the fluorescent powder to obtain white light. Since the first method requires the use of three light-emitting diodes, the cost is high. In the second method, the light-emitting diode module emits light unevenly. Generally, an optical lamp cover, such as a diffusion plate or a light guide plate, is required to make the white light-emitting diode module emit light uniformly, but the optical lamp cover is used. It is technically difficult to assemble a white light emitting diode module.

In view of this, it is necessary to provide a lighting device which is low in cost and can emit different colors of light.

A lighting device comprising at least one light emitting diode, a setting a first fluorescent film on the light emitting side of the at least one light emitting diode and a second fluorescent film attached to the first fluorescent film. A first phosphor powder is disposed in the first phosphor film. The second phosphor film is provided with a second phosphor powder, and the first phosphor powder and the second phosphor powder are excited by the light emitted by the at least one light emitting diode, and the light emitted by the light source is emitted. The wavelength is converted.

Compared with the prior art, the first phosphor powder disposed in the first phosphor film of the illumination device and the second phosphor powder disposed in the second phosphor film are excited by the light emitted by the light source. The light from the source can be converted to emit light of other colors. The first fluorescent film and the second fluorescent film are used as secondary optical components without encapsulating the fluorescent powder in the light emitting diode, thereby improving the optical performance of the lighting device, simplifying the manufacturing process, and saving cost. At the same time, different fluorescent films can be replaced according to actual needs to make the lighting device emit different colors of light.

Please refer to FIG. 1 , which is a cross-sectional view of a lighting device 100 according to a first embodiment of the present invention. The illumination device 100 includes a light source 11, a first fluorescent film 12, and a second fluorescent film 13.

The light source 11 includes a substrate 111 and a plurality of light emitting diodes 112 disposed on the substrate 111. Preferably, the light emitting diode 112 is an ultraviolet light emitting diode.

The first fluorescent film 12 is disposed opposite to the light source 11. The first phosphor powder 121 is disposed in the first fluorescent film 12.

The second fluorescent film 13 is attached to the first fluorescent film 12. In this embodiment The second fluorescent film 13 is attached to one side of the first fluorescent film 12 facing away from the light source 11 . A second phosphor powder 131 is disposed in the first fluorescent film 12.

The materials of the first fluorescent film 12 and the second fluorescent film 13 may be (Resin), Silicone, Polymer, acrylic, and polymethyl methacrylate (PMMA). Or plastic. Specifically, the resin material includes an epoxy resin (Epoxy), a polycarbonate resin (Polyethylene terephalate). The high molecular polymer includes polycarbonate (PC) or polymethyl methacrylate (PMMA). Preferably, the first fluorescent film 12 and the second fluorescent film 13 are flexible and flexible, and can be formed into various shapes such as a wave shape, a curved shape and the like.

The first phosphor powder 121 and the second phosphor powder 131 may each be a sulfide (Sulfides), an aluminate (Aluminates), an oxide (Oxides), a silicate (Silicates) or a nitride (Nitredes). . Specifically, the phosphor powder 13 may be Ca ₂ Al ₁₂ O ₁₉ : Mn, (Ca, Sr, Ba) Al ₂ O ₄ :Eu, Y ₃ A ₁₅ O12Ce ³⁺ (YAG), Y ₂ O ₂ S: Eu ³⁺ , Tb ₃ Al ₅ O ₁₂ :(Ca,Sr,Ba)S:Eu ²⁺ ,Ce ³⁺ (YAG),Ca ₈ Mg(SiO ₄ ) ₄ Cl ₂ :Eu ²⁺ ,(Sr,Ca , Ba)Si _x O _y N _z :Eu ²⁺ ,(Mg,Ca,Sr,Ba) ₂ SiO ₄ :Eu ₂₊ ,(Mg,Ca,Sr,Ba) ₃ Si ₂ O ₇ :Eu ²⁺ , CdS, CdSe, Ca ₂ Si ₅ N ₈ :Eu ²⁺ , CdTe, (Ca, Mg, Y) SiwAl _x O _y N _z :Eu ²⁺ or BaMgAl ₁₀ O ₁₇ :Eu ²⁺ (Mn ²⁺ ).

The first phosphor powder 121 and the second phosphor powder 131 are excited by the light emitted by the plurality of light-emitting diodes 112 to convert the wavelength of the light emitted by the plurality of light-emitting diodes 112 to emit Light of different colors.

It can be understood that the distribution density of the first phosphor powder 121 in different regions of the first phosphor film 12 may be different, and the distribution density of the second phosphor powder 131 in different regions of the second phosphor film 13 It can also be different. Since the first phosphor powder 121 of different densities and the second phosphor powder 131 of different densities have different absorption ratios of the light emitted from the light source 11, the wavelengths of the light emitted by the plurality of LEDs 112 are converted, thereby Can emit a variety of different colors of light.

In the embodiment, the first fluorescent film 12 and the second fluorescent film 13 are used as secondary optical elements, and the fluorescent powder 13 is not required to be encapsulated in the LEDs 112, thereby improving the illumination device 100. The optical performance and simplification of the production process saves costs. At the same time, the first fluorescent film 12 and the second fluorescent film 13 containing different phosphors can be replaced according to actual needs, so that the lighting device 100 has certain flexibility.

It can be understood that, in this embodiment, the illumination device 100 can also include a plurality of fluorescent films, and the plurality of fluorescent films are superposed on each other and disposed opposite to the light source 11.

2 is a schematic cross-sectional view of a lighting device 200 according to a second embodiment of the present invention. The illumination device 200 has substantially the same structure as the illumination device 100 provided by the first embodiment. The illumination device 200 includes a light source 21, a first fluorescent film 22, and a second fluorescent film 23.

The first embodiment differs from the first embodiment in that the first fluorescent film 22 of the illumination device 200 includes a plurality of first fluorescent regions 225 arranged in an array. A plurality of phosphor powders are disposed in the first fluorescent film 22. In the embodiment, the first phosphor film 22 is provided with a first phosphor powder 221 and a third phosphor powder. 222. Preferably, the first phosphor powder 221 and the third phosphor powder 222 are respectively disposed at a plurality of first fluorescent regions 225 of the first fluorescent film 22, that is, the adjacent first fluorescent regions 225 are differently disposed. Fluorescent powder.

It can be understood that the positions of the first fluorescent film 22 and the second fluorescent film 23 can also be interchanged. That is, the second fluorescent film 23 may be disposed on a side opposite to the light source 21, and the first fluorescent film 22 is attached to the second fluorescent film 23 and located away from one side of the light source 21.

Please refer to FIG. 3 , which is a cross-sectional view of a lighting device 300 according to a third embodiment of the present invention. The illumination device 300 has substantially the same structure as the illumination device 200 provided by the second embodiment. The illumination device 300 includes a light source 31, a first fluorescent film 32, and a second fluorescent film 33.

The second embodiment is different from the second embodiment in that the second fluorescent film 33 includes a plurality of second fluorescent regions 335 arranged in an array, and the second fluorescent film 33 is provided with a plurality of phosphors.

Specifically, the second fluorescent film 33 includes a plurality of second fluorescent regions 335 disposed opposite to the plurality of first fluorescent regions 325 included in the first fluorescent film 32. The second phosphor powder 331 and the fourth phosphor powder 332 are disposed in the second phosphor film 33. The second phosphor powder 331 and the fourth phosphor powder 332 are respectively disposed at a plurality of second phosphor regions 335 of the second phosphor film 33, that is, the adjacent second phosphor regions 335 are provided with different flickers. Light powder.

The first phosphor powder 321 and the third phosphor powder 322 disposed in the first phosphor film 32 and the second phosphor powder 331 and the fourth phosphor powder 332 disposed in the second phosphor film 33 are disposed on the light source Under the excitation of the emitted light, the light emitted by the light source 31 is wavelength-converted to emit light of different colors.

Certainly, the plurality of second fluorescent regions 335 included in the second fluorescent film 33 and the plurality of first fluorescent regions 325 included in the first fluorescent film 32 may also be alternately arranged. Please refer to FIG. 4 together. .

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100, 200, 300‧‧‧ lighting devices

11, 21, 31‧‧‧ light source

12, 22, 32‧‧‧ first fluorescent film

13, 23, 33‧‧‧ second fluorescent film

111‧‧‧Substrate

112‧‧‧Lighting diode

121, 221, 321‧‧‧ first fluorescent powder

131,331‧‧‧Second Fluorescent Powder

225, 325‧‧‧ first fluorescent area

222, 322‧‧‧ third phosphor powder

335‧‧‧Second fluorescent area

332‧‧‧Four Fluorescent Powder

1 is a schematic cross-sectional view of a lighting device according to a first embodiment of the present invention.

2 is a schematic cross-sectional view of a lighting device according to a second embodiment of the present invention.

3 is a schematic cross-sectional view of a lighting device according to a third embodiment of the present invention.

4 is a schematic cross-sectional view showing a plurality of second fluorescent regions and a plurality of first fluorescent regions interlaced in FIG.

100‧‧‧Lighting device

11‧‧‧Light source

12‧‧‧First fluorescent film

13‧‧‧Second fluorescent film

111‧‧‧Substrate

112‧‧‧Lighting diode

121‧‧‧First Fluorescent Powder

131‧‧‧Second Fluorescent Powder

Claims (3)

A lighting device comprising: at least one light emitting diode; a first fluorescent film disposed on a light emitting side of the at least one light emitting diode, the first fluorescent film comprising a plurality of arrays arranged in a first firefly In the light region, the first phosphor powder and the third phosphor powder are respectively disposed in the plurality of first phosphor regions; a second phosphor film attached to the first phosphor film, the second phosphor a second phosphor powder and a fourth phosphor powder are disposed in the light film, the second phosphor film includes a plurality of second phosphor regions arranged in an array, and the second phosphor powder and the fourth phosphor powder are respectively spaced apart In the plurality of second fluorescent regions, a plurality of first fluorescent regions of the first fluorescent film and a plurality of second fluorescent regions of the second fluorescent film are alternately disposed, the first fluorescent powder, The second phosphor powder, the third phosphor powder and the fourth phosphor powder are excited by the light emitted by the at least one light emitting diode to convert the wavelength of the light emitted by the light source. The illuminating device of claim 1, wherein the illuminating diode is an ultraviolet illuminating diode. The illuminating device according to claim 1, wherein the fluorescent film is made of resin, silicone, polymer, acrylic or plastic.