TW201349591A - Light emitting diode having photo-catalyst and suppressing short wavelength light function - Google Patents

Abstract

The invention provides a light emitting diode having photo-catalyst and capable of suppressing short wavelength light comprising a luminous body. Fluorescent powder material and a transparent encapsulating layer are disposed at the light source illuminated region of the luminous body. The light generated by light source is excited by the fluorescent powder material into white light and penetrating from the transparent encapsulating layer. An optical interference film capable of suppressing short wavelength light source is disposed on the external circumference of the transparent encapsulating layer in the illuminated region of the light source. The optical interference film is composed of bismuth oxide and resin, thereby forming the invention.

Description

Light-emitting diode and light-emitting diode for suppressing short-wavelength light function

The invention relates to a light-emitting diode, in particular to a light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light.

According to the white light emitting diode, the blue light crystal is coated with yellow fluorescent powder or the ultraviolet light crystal is coated with three primary color (RGB) fluorescent powder to excite white light, and the white light emitting diode is basically energy-saving and environmentally friendly. And small size and other advantages, is widely used in electronic communications, automotive, optoelectronic display and other industries, so gradually replaced the traditional lighting equipment, is expected to become the product trend of the future lighting market.

At present, most of the research reports and commercial light-emitting diode light source products focus on the improvement and improvement of luminous efficiency, color rendering, color temperature, etc., and pay little attention to the health and safety of light-emitting diode light sources. . According to a recent report in the October 2010 issue of "Lighting systems using lightemit-ting diodes: health issu-es to be considered" by the French Food, Environmental and Occupational Health and Safety Agency, due to the presence of a light-emitting diode source The problems of blue ligh-t and glare will pose a hazard to human health and provide specific and relevant recommendations. The hazards of photochemistry are related to blue light (short wavelength), and the degree of damage is determined by the cumulative exposure of blue light. According to research evidence from human experimental observation, cell culture and animal clinical experiments, short-wavelength light waves (blue-violet light) are dangerous and harmful. The group is quite toxic to the retina, and the population at risk includes infants, patients who are already suffering from light sen-sitive diseases, and those who are often exposed to the light source of the light-emitting diode. When the luminance of the light source is greater than 10,000 cd/m ² , visual discomfort will be caused, since the illuminating surface of the illuminating diode light source is concentrated within a very small range of about 300×300 μm ² of the illuminating wafer, resulting in each illuminating dipole The illuminance of the body light source is higher than 1000 times of the visual discomfort threshold, so the problem of severe glare of the light-emitting diode source must be solved.

As shown in FIG. 5, it is a conventional white light emitting diode in which a susceptor 90 is provided with an ultraviolet ray 91 and a three primary color (RGB) phosphor layer 92, and a transparent encapsulation layer 93. The light source emitted from the ultraviolet crystal grain 91 is excited by the phosphor powder layer 92 into white light, and is transparent from the transparent encapsulating layer 93.

However, the common problem of the above-mentioned white light emitting diodes is that when white light is emitted, there is still light leakage of blue light or ultraviolet light in the light source that is transmitted. For example, as shown in FIG. 6, the ultraviolet light crystal grains are matched with the three primary color fluorescent powders. When white light is emitted, short-wavelength ultraviolet light with a relative intensity of 2.5 is generated between 350 and 400 nm. As shown in Fig. 7, the blue crystal grain and the yellow fluorescent powder will emit at a wavelength of 400 to 500 nm when emitting white light. A short-wavelength blue light with a intensity of 1 is generated. Since short-wavelength light such as blue light and ultraviolet light is easily damaged to the eyes and skin, it may cause eye strain, soreness, and even headaches, and glare problems may occur when light is emitted. Quality needs to be strengthened.

Therefore, how to solve the problem of the above-mentioned conventional light-emitting diodes is the main focus of the creation.

The main object of the present invention is to solve the above problems and provide a light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light, and an optical interference film of bismuth oxide (Bi ₂ O ₃ ) material is combined to effectively suppress short wavelengths. Light reduces the risk of short-wave damage, eliminates glare and improves luminous efficiency, as well as air purification.

In order to achieve the above object, the present invention comprises an illuminant, wherein a luminescent body and a transparent encapsulating layer are disposed in a diverging range of the illuminant light source, and the light source emitted by the illuminating body is excited by the luminescent material into white light. The transparent encapsulating layer is transparent, and an optical interference film for suppressing a short-wavelength light source is disposed on the outer periphery of the transparent encapsulating layer. The optical interference film is composed of an oxidized bismuth material and a resin.

The above and other objects and advantages of the present invention will be readily understood from

Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.

Referring to Figure 1, the structure of the embodiment selected for use in the present invention is for illustrative purposes only and is not limited by such structure in the patent application.

The present invention provides a light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light. In this embodiment, as shown in FIG. 1, the system is:

An illuminant 1 is disposed in a pedestal 2 in the embodiment, and is electrically connected to the pin 20 outside the susceptor 2, and the light source emitted by the illuminator 1 diverges upward in the figure, and is diverged in the light source. The phosphor powder is hardened into a phosphor layer 3, and a transparent encapsulating layer 4 is disposed on the phosphor layer 3. The light source emitted by the illuminator 1 is excited by the luminescent material into white light. The transparent encapsulation layer 4 is refracted. In the embodiment, the illuminant 1 is an ultraviolet ray, which can emit ultraviolet light, and the luminescent material corresponds to three primary color phosphors; in addition, the illuminator 1 can also be a blue crystal grain, which can emit blue light. The fluorescent powder corresponds to yellow fluorescent powder.

The outer periphery of the transparent encapsulation layer 4 is provided with an optical interference film 5 having a function of suppressing a short-wavelength light source, which is made of oxidized bismuth material (Bi ₂ O ₃ ) and resin, in the light-emitting range of the illuminant. composition. In the present embodiment, the optical interference film 5 is formed by adding an oxidized bismuth material to a gel-like resin and adhering to the outer periphery of the transparent encapsulating layer 4 to be hardened.

As shown in Fig. 2, in the absence of suppression by the optical interference film 5, short-wavelength light having a intensity of 1 is generated between wavelengths of 350 to 400 nm, and short-wavelength light having a intensity of 0.5 is generated between wavelengths of 425 to 475 nm. Producing short-wavelength light with a intensity of 0.8 between wavelengths of 500 to 550 nm, short-wavelength light of intensity of 0.6 between wavelengths of 600 to 700 nm; and suppression of wavelength of 350 to 350 by the optical interference film 5 The short-wavelength light between 400 nm is suppressed and the intensity is lowered to 0.4 or less, the short-wavelength light between the wavelengths of 425 to 475 nm is suppressed and the intensity is lowered to 0.2 or less, and the short wavelength between the wavelengths of 500 to 550 nm Light is suppressed and the intensity is lowered to 0.3 or less, and short-wavelength light having a wavelength of 600 to 700 nm is suppressed and the intensity is lowered to 0.2 or less.

The effect of the optical interference film is that when the incident light is incident by the optical interference film, if the thickness of the optical interference film corresponds to a specific incident light wavelength, the incident light will be reflected back by the optical interference film, and to achieve this effect, The thickness of the optical interference film in the light-emitting diode must be further calculated by the wavelength of the incident light, and the thickness d of the optical interference film is calculated as:

In the above formula, d is the thickness of the optical interference film, m is an integer from 0 to N, λ is the wavelength in the medium, λ _o is the wavelength of the incident light, and n is the refractive index.

In the present embodiment, when m=0, λ _o =385 nm; taking n=1.5, the optical interference film thickness d is:

Therefore, the thickness of the optical interference film 5 of the present embodiment is 64.17 nanometers (nm), and if light having a wavelength of 385 nm is incident on the optical interference film 5 due to light leakage, the light will be reflected back to the fluorescent powder by the optical interference film 5. In the layer 3, the reflected light is excited by the phosphor layer 3 into white light and is transmitted through the optical interference film 5.

From the above description, it is not difficult to find that the light-emitting diode of the present invention has the following advantages over the conventional light-emitting diode:

1. Since the oxidized coffin is distributed in the form of fine particles and has a diffuser function, when the light penetrates the oxidized coffin, it will be dispersed to make the illuminance uniform and achieve the anti-glare effect.

2. When the ultraviolet light or the blue light has a light leakage phenomenon, in addition to being suppressed by the optical interference film 5, part of the ultraviolet light or blue light is reflected by the optical interference film 5, and then excited by the fluorescent powder material to form white light. Therefore, it can improve the efficiency of light emission, thereby achieving the effect of energy saving.

3. Since the film thickness of the optical interference film is fixed, and the light penetrates the optical interference film at different angles, part of the short-wavelength light will still leak out through the optical interference film by oxidizing the electron energy of the coffin itself. The order is below 3.9 ev, and has the characteristics of absorbing ultraviolet light and short-wavelength visible light, so that some of the short-wavelength light leaking out through the optical interference film 5 will be absorbed by the oxidized sputum, so as to intercept the leakage. Short wavelength light.

4. The oxidized bismuth material is also a photocatalyst, so after absorbing ultraviolet light or blue light, it can have the effect of air purification and has an environmental protection effect.

5. The oxidized coffin itself is slightly yellow in goose (egg). When the light source is emitted through the oxidized coffin, the color temperature is tested to be close to 5611K. Therefore, the light-emitting diode of the present invention has a high color rendering and its light source is close. Natural light, bright feeling makes people concentrate, and can present the original color of the object, making the object clear and visible, suitable for light sources in offices, classrooms, conference rooms, libraries and other places.

Of course, there are many examples of the invention, with only minor variations in the details. Referring to FIG. 3, which is a second embodiment of the present invention, the main difference from the first embodiment is that the optical interference film 6 of the present embodiment is provided with a resin layer 60 on the outer periphery of the transparent encapsulation layer 4. A ruthenium oxide layer 61 is provided on the resin layer 60. The ruthenium oxide layer 61 is adhered to the outer periphery of the transparent encapsulation layer 4 by the resin layer 60, thereby achieving the same effect as the first embodiment.

Referring to FIG. 4 , which is a third embodiment of the present invention, the main difference from the first embodiment is that the transparent encapsulation layer 4 is provided with an optical interference film 7 on the side close to the illuminator 1 . An air layer 70 is present between the interference film 7 and the phosphor layer 3, and the transparent encapsulation layer 4 is provided with a hafnium oxide layer 8 on the side opposite to the optical interference film 7. In this embodiment, the light source emitted by the illuminator 1 is excited by the phosphor layer 3 into white light, and is refracted through the air layer 70 and injected into the optical interference film 7, and the light passes through the transparent encapsulation layer 4. Out of the yttrium oxide layer 8 outside.

Therefore, the short-wavelength can be eliminated by suppressing the short-wavelength light source such as ultraviolet light or blue light through the optical interference film 7, and part of the ultraviolet light or blue light can also be reflected by the optical interference film 7, and then excited by the fluorescent powder material to form white light. In order to improve the luminous efficiency, the cerium oxide layer 8 is used as a photocatalyst to achieve the effect of purifying air, and the light source emitted from the yttrium oxide layer 8 also has the advantages of appropriate color temperature and high color rendering property, thereby achieving the same with the first embodiment. The same effect.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

(customized part)

90. . . Pedestal

91. . . Ultraviolet crystal grain

92. . . Fluorescent powder layer

93. . . Transparent encapsulation layer

(part of the invention)

1. . . illuminator

2. . . Pedestal

20. . . Pin

3. . . Fluorescent powder layer

4. . . Transparent encapsulation layer

5. . . Optical interference film

6. . . Optical interference film

60. . . Resin layer

61. . . Cerium oxide layer

7. . . Optical interference film

70. . . Air layer

8. . . Cerium oxide layer

Fig. 1 is a schematic view showing the planar structure of a light-emitting diode of the first embodiment.

Fig. 2 is a waveform diagram before and after suppression of short-wavelength light of the light-emitting diode of the first embodiment.

Fig. 3 is a schematic view showing the planar structure of the light-emitting diode of the second embodiment.

Fig. 4 is a schematic view showing the planar structure of the light-emitting diode of the third embodiment.

Figure 5 is a schematic view of the planar structure of a conventional light-emitting diode.

Fig. 6 is a waveform diagram showing that short-wavelength light is not suppressed when ultraviolet light crystal grains are emitted.

Fig. 7 is a waveform diagram in which short-wavelength light is not suppressed when the blue crystal grain is illuminated.

1. . . illuminator

2. . . Pedestal

20. . . Pin

3. . . Fluorescent powder layer

4. . . Transparent encapsulation layer

5. . . Optical interference film

Claims (8)

A light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light, comprising an illuminant, wherein a luminescent body and a transparent encapsulation layer are disposed in a diverging range of the illuminant light source, and the illuminating body emits a light source The powder is excited to be white light and is transparent to the transparent encapsulating layer. The outer periphery of the transparent encapsulating layer is provided with an optical interference film for suppressing a short-wavelength light source in the light-emitting range of the illuminating body. The optical interference film is made of oxidized bismuth material and Resin composition. a light-emitting diode having a photocatalyst and a short-wavelength light-reducing function according to the first aspect of the patent application, wherein the optical interference film is formed by adding an oxidized bismuth material capable of absorbing ultraviolet light or blue light to a gel-like resin, and Attached to the outer periphery of the transparent encapsulation layer to be hardened. The light-emitting diode having the photocatalyst and the function of suppressing the short-wavelength light according to the first aspect of the patent application, wherein the optical interference film is provided with a resin layer on the outer periphery of the transparent encapsulation layer, and a resin layer is disposed on the resin layer. The ruthenium oxide layer is adhered to the outer periphery of the transparent encapsulation layer by the resin layer. A light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light according to the first aspect of the patent application, wherein the illuminant is an ultraviolet ray, and the luminescent powder corresponds to a three-primary luminescent powder. A light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light according to the first aspect of the patent application, wherein the illuminant is a blue light crystal, and the fluorescent powder corresponds to a yellow luminescent powder. A light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light, comprising an illuminant, wherein a luminescent body and a transparent encapsulation layer are disposed in a diverging range of the illuminant light source, and the illuminating body emits a light source The powder is excited to be white light and is transparent to the transparent encapsulation layer. The transparent encapsulation layer is provided on an side close to the illuminant with an optical interference film for suppressing a short-wavelength light source, the optical interference film and the fluorescent powder material. There is an air layer between them, and the transparent encapsulation layer is provided with a ruthenium oxide layer on the side opposite to the optical interference film. According to the sixth aspect of the patent application, the photodiode and the short-wavelength light-reducing light-emitting diode are used, wherein the illuminant is an ultraviolet ray, and the luminescent powder corresponds to a three-primary luminescent powder. A light-emitting diode having a photocatalyst and a function of suppressing short-wavelength light according to the sixth aspect of the patent application, wherein the illuminant is a blue ray, and the luminescent material corresponds to a yellow luminescent powder.