Patent Description:
With the continuous development of the LED industry, manufacturers no longer only consider a luminous efficiency or a service life, but also consider people's feelings for light and impacts of the light on people, hoping to produce artificial light closer to natural light. Full-spectrum LED light sources and healthy lighting have become hot spots in the industry in recent years.

The full-spectrum LED light source is a light source that a spectrum thereof is similar to a solar spectrum and takes an LED as a light-emitting body. For example, LED filament A which is a light-emitting device of a bulb in <FIG> is a full-spectrum LED light source. A full-spectrum LED light source mainly includes a bracket, a chipset, and an encapsulation adhesive, and the chipset includes an LED capable of emitting blue light (hereinafter referred to as "blue LED chip"). A color rendering index (CRI) indicates an ability of a light source reproducing a visual experience of an object that is in sunlight. A higher color rendering property means that the closer a CRI value is to <NUM>, the better a color reproduction capability for the object is, and it is easier for human eyes to distinguish a color of the object. An existing full-spectrum LED light source has a higher CRI (><NUM>) than an ordinary LED light source. Except that values of the special CRIs R9 (saturated red) and R12 (saturated blue) are not ideal, other CRI values are all above <NUM>.

In the prior art, there are already some improvement solutions for the problem that the values of the special CRIs R9 (saturated red) and R12 (saturated blue) are not ideal:.

A problem to be resolved by the present disclosure is to provide a full-spectrum LED light source and a manufacturing method thereof, which have a good luminous efficiency and a low cost, and can increase values of special CRIs R9 and R12 in R1 to R15 to more than <NUM>.

To resolve the foregoing technical problem, a first aspect of the present invention provides a full-spectrum LED light source. The full-spectrum LED light source includes a bracket, a chipset, and an encapsulation adhesive, where the encapsulation adhesive is mixed with phosphor powder, and the chipset includes a first blue LED chip with a peak wavelength of <NUM> to <NUM>, a second blue LED chip with a peak wavelength of <NUM> to <NUM>, and a third blue LED chip with a peak wavelength of <NUM> to <NUM> that are connected in series or in parallel.

In the full-spectrum LED light source of the invention, the phosphor powder includes yellow phosphor powder with a peak emission wavelength of <NUM> to <NUM> under excitation by blue light, green phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light, and red phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light.

In the full-spectrum LED light source of the invention, and in accordance with the invention, a percent by weight of the yellow phosphor powder is <NUM>% to <NUM>%, a percent by weight of the green phosphor powder is <NUM>% to <NUM>%, a percent by weight of the red phosphor powder is <NUM>% to <NUM>%, and a percent by weight of the encapsulation adhesive is <NUM>% to <NUM>%.

As a preferred solution of the full-spectrum LED light source, the full-spectrum LED light source is a filament, the bracket is provided with a plurality of chipsets connected in series or in parallel, each of the chipsets includes the first blue LED chip, the second blue LED chip, and the third blue LED chip that are connected in series or in parallel in a specified arrangement order.

As a preferred solution of the full-spectrum LED light source, the specified arrangement order is the first blue LED chip, the second blue LED chip, and the third blue LED chip;.

A second aspect of the present invention provides a manufacturing method of a full-spectrum LED light source, including steps of:.

In the manufacturing method of a full-spectrum LED light source according to the invention, the phosphor powder includes yellow phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light, green phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light, and red phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light.

In the manufacturing method of a full-spectrum LED light source according to the invention, a percent by weight of the yellow phosphor powder is <NUM>% to <NUM>%, a percent by weight of the green phosphor powder is <NUM>% to <NUM>%, a percent by weight of the red phosphor powder is <NUM>% to <NUM>%, and a percent by weight of the encapsulation adhesive is <NUM>% to <NUM>%.

As a preferred solution of the manufacturing method of a full-spectrum LED light source, in a same chipset column, each of the chipsets includes the first blue LED chip, the second blue LED chip, and the third blue LED chip that are connected in series or in parallel in a specified arrangement order.

As a preferred solution of the manufacturing method of a full-spectrum LED light source, the specified arrangement order is the first blue LED chip, the second blue LED chip, and the third blue LED chip;.

Compared with the prior art, the full-spectrum LED light source and the manufacturing method thereof according to the present disclosure have the following beneficial effects:.

The present disclosure adopts the blue LED chips of the three wave bands of <NUM> to <NUM>, <NUM> to <NUM>, and <NUM> to <NUM> in a mix-and-match manner, supplements a missing spectrum while exciting the phosphor powder, increases values of special CRIs R9 (saturated red) and R12 (saturated blue) to above <NUM>. The present disclosure has a good luminous efficiency and a low cost, and makes a spectrum closer to a solar spectrum, which can better reproduce a true color of a real object and makes a color of light comfortable and free from hurting eyes. Moreover, the present disclosure has a simple production process and high production efficiency, which is conducive to market promotion.

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, accompanying drawings of the embodiments will be briefly introduced below.

The technical solutions in the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

As shown in <FIG>, according to a preferred embodiment of the present disclosure, a full-spectrum LED light source may be an LED filament or an LED bead, and in accordance with the invention includes a bracket <NUM>, a chipset <NUM>, and an encapsulation adhesive <NUM>. The encapsulation adhesive <NUM> is mixed with phosphor powder, and the chipset <NUM> includes a first blue LED chip <NUM> with a peak wavelength of <NUM> to <NUM>, a second blue LED chip <NUM> with a peak wavelength of <NUM> to <NUM>, and a third blue LED chip <NUM> with a peak wavelength of <NUM> to <NUM> that are connected in series (as shown in <FIG>) or in parallel (as shown in <FIG>).

Based on the above full-spectrum LED light source, as shown in <FIG>, by taking an LED filament as an example, a manufacturing method of the full-spectrum LED light source according to the invention includes steps of:.

For example, the circuit on the bracket <NUM> includes at least the following four implementations:.

For example, the bracket <NUM> is a transparent bracket, which helps the filament to emit light at <NUM> degrees.

In accordance with the invention, in order to make a spectrum of the LED light source closer to a solar spectrum, the phosphor powder includes yellow phosphor powder with a peak emission wavelength of <NUM> to <NUM> under excitation by blue light, green phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light, and red phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light Further in accordance with the invention, a percent by weight of the yellow phosphor powder is <NUM>% to <NUM>%, a percent by weight of the green phosphor powder is <NUM>% to <NUM>%, a percent by weight of the red phosphor powder is <NUM>% to <NUM>%, and a percent by weight of the encapsulation adhesive is <NUM>% to <NUM>%. In this embodiment, the encapsulation adhesive may include an epoxy resin adhesive and an epoxy resin curing agent. A weight ratio between the epoxy resin adhesive and the epoxy resin curing agent can be set with reference to the prior art, and details are not described herein.

For example, as shown in <FIG>, in a same chipset column, each of the chipsets <NUM> includes the first blue LED chip <NUM>, the second blue LED chip <NUM>, and the third blue LED chip <NUM> that are connected in series or in parallel in a specified arrangement order.

For example, the specified arrangement order specifically includes the following implementations:.

Next, for characteristics of the above full-spectrum LED light source, a spectrum test is conducted for comparison:.

Under a same test condition (including composition parameters of the phosphor powder), the spectrum test is separately conducted for light produced by the encapsulation adhesive <NUM> being excited by a single blue LED chip, being excited by a blue LED chip and a purple LED chip, or being excited by the full-spectrum LED light source in this embodiment, to perform comparison. A peak wavelength of one of the three blue LED chips of different bands of the full-spectrum LED light source in this embodiment is <NUM> to <NUM>, which is the same as that of the blue LED chip in the other two tests.

After the spectrum test, <FIG> is a spectrogram obtained when the single blue LED chip is tested, <FIG> is a spectrogram obtained when the blue LED chip and the purple LED chip are tested, and <FIG> is a spectrogram obtained when the full-spectrum LED light source in this embodiment is tested. Relative intensity in <FIG> is a value of another wavelength relative to <NUM> when an intensity value corresponding to the wavelength of <NUM> is <NUM>. The three spectrograms obviously show that a wave crest of the full-spectrum LED light source in the blue band is lower, and relative intensity of the spectrum is closer to the solar spectrum. Moreover, in the spectrum of the full-spectrum LED light source, the three blue LED chips with different peak wavelengths are used, such that the phosphor powder can emit light in more bands under the excitation by blue light with high, medium, and low peak wavelengths, to supplement some missing spectra. A curve trend (indicated by a solid line in <FIG>) of the spectrum of the full-spectrum LED light source is closer to a curve trend (indicated by a dotted line in <FIG>) of the solar spectrum.

In addition, test data of CRI values of R1 to R15 of the full-spectrum LED light source in the embodiments of the present disclosure is shown in Table <NUM>. It can be seen from Table <NUM> that the CRI values of R1 to R15 can reach above <NUM>.

The full-spectrum LED light source and the manufacturing method thereof provided in the embodiments of the present disclosure adopt the blue LED chips of the three wave bands of <NUM> to <NUM>, <NUM> to <NUM>, and <NUM> to <NUM> in a mix-and-match manner, supplements a missing spectrum while exciting the phosphor powder, increases values of special CRIs R9 (saturated red) and R12 (saturated blue) to more than <NUM>. The full-spectrum LED light source and the manufacturing method thereof have a good luminous efficiency and a low cost, and make the spectrum closer to the solar spectrum, which can better reproduce a true color of a real object and makes a color of light comfortable and free from hurting eyes. Moreover, the full-spectrum LED light source and the manufacturing method thereof have a simple production process and high production efficiency, which is conducive to market promotion.

Claim 1:
A full-spectrum light-emitting diode (LED) light source, comprising a bracket (<NUM>), a chipset (<NUM>), and an encapsulation adhesive (<NUM>), wherein the encapsulation adhesive (<NUM>) is mixed with phosphor powder, and the chipset (<NUM>) comprises a first blue LED chip (<NUM>) with a peak wavelength of <NUM> to <NUM>, a second blue LED chip (<NUM>) with a peak wavelength of <NUM> to <NUM>, and a third blue LED chip (<NUM>) with a peak wavelength of <NUM> to <NUM> that are connected in series or in parallel;
wherein the phosphor powder comprises yellow phosphor powder with a peak emission wavelength of <NUM> to <NUM> under excitation by blue light, green phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light, and red phosphor powder with a peak emission wavelength of <NUM> to <NUM> under the excitation by the blue light;
characterized in that a percent by weight of the yellow phosphor powder is <NUM>% to <NUM>%, a percent by weight of the green phosphor powder is <NUM>% to <NUM>%, a percent by weight of the red phosphor powder is <NUM>% to <NUM>%, and a percent by weight of the encapsulation adhesive (<NUM>) is <NUM>% to <NUM>%.