CN112635643A

CN112635643A - LED lamp bead

Info

Publication number: CN112635643A
Application number: CN202011572894.3A
Authority: CN
Inventors: 何懿德
Original assignee: Shenzhen Xuanding Photoelectric Technology Co ltd
Current assignee: Shenzhen Xuanding Photoelectric Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-09

Abstract

The invention discloses an LED lamp bead, which comprises: a rack having a bowl; the LED chip is arranged in the bowl cup, and the LED chip can emit a plurality of blue lights with different peak wavelengths; and the packaging adhesive is filled in the bowl cup and used for packaging the LED chip, and fluorescent powder is mixed in the packaging adhesive. The technical scheme of the invention aims to provide the LED lamp bead with high lighting effect and continuous spectrum so as to realize high-quality natural light-like illumination.

Description

LED lamp bead

Technical Field

The invention relates to the field of illumination, in particular to an LED lamp bead.

Background

The full spectrum is a spectrum curve including ultraviolet light, visible light and infrared light in the spectrum, and the proportion of red, green and blue in the visible light part is similar to that of sunlight, and the color rendering index is close to 100. The spectrum of the sunlight can be called as full spectrum, and the color temperature of the sunlight changes along with the change of four seasons, morning and evening, so that the spectrum of the full spectrum lamp can change the color temperature along with the change of time in sequence to simulate the natural light environment and better accord with the natural growth rule of organisms. However, the existing full-spectrum lamp bead has the defects of low lighting effect and discontinuous spectrum, and cannot realize high-quality natural light illumination.

Disclosure of Invention

The invention mainly aims to provide an LED lamp bead, and aims to provide an LED lamp bead with high lighting effect and continuous spectrum so as to realize high-quality natural light-like illumination.

In order to achieve the above object, the LED lamp bead provided by the present invention comprises:

a rack having a bowl;

the LED chip is arranged in the bowl cup, and the LED chip can emit a plurality of blue lights with different peak wavelengths;

and the packaging adhesive is filled in the bowl cup and used for packaging the LED chip, and fluorescent powder is mixed in the packaging adhesive.

In one embodiment, the peak wavelength range of any one of the blue lights emitted by the LED chip is 400nm to 485 nm.

In one embodiment, the phosphor comprises a green phosphor comprising GaYAG powder.

In one embodiment, the peak wavelength range of the green phosphor is 510nm to 545 nm.

In one embodiment, the green phosphor further includes a chloride salt powder.

In one embodiment, the weight of the green phosphor accounts for 75-85% of the total weight of the phosphor.

In one embodiment, the phosphor includes a red phosphor having a peak wavelength in a range of 610nm to 670 nm.

In one embodiment, the weight of the red phosphor accounts for 15% to 25% of the total weight of the phosphor.

In one embodiment, the bracket comprises a plastic wall body for constructing the side wall of the bowl and a plastic bottom wall for covering the bottom of the bowl, and the plastic wall body and the plastic bottom wall are integrally formed by white plastic; the plastic bottom wall is provided with a first avoidance hole for mounting the LED chip and two second avoidance holes respectively corresponding to the anode welding position and the cathode welding position.

In an embodiment, the aperture of the second avoiding hole is gradually increased in a direction towards the rim of the bowl.

According to the LED lamp bead, the plurality of blue lights with different peak wavelengths are superposed on the LED chip, so that the defects of the traditional single LED chip scheme are overcome, and the LED lamp bead has the advantages of high lighting effect and continuous spectrum; the LED lamp bead can realize the superposition of a plurality of blue lights with different peak wavelengths by adopting the single LED chip, thereby avoiding the risk of the series connection of the double LED chips, solving the problem of thermal resistance of the series connection of the double LED chips, not only generating no great light attenuation, but also meeting the requirements of dimming and color mixing, therefore, the LED lamp bead can realize high-quality natural light-like illumination.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an LED lamp bead according to an embodiment of the invention at a viewing angle;

FIG. 2 is a schematic structural diagram of an LED lamp bead according to another view angle in the embodiment of the invention;

FIG. 3 is a spectrum diagram of an embodiment of an LED chip of the LED lamp bead of the present invention;

fig. 4 is a full spectrum diagram of an embodiment of the LED lamp bead of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Support frame	200	LED chip
300	Lead wire	110	Plastic wall
				120	Plastic bottom wall	121	First avoidance hole
122	Second avoiding hole	123	Connecting part
				130	Limiting hole

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The full spectrum is a spectrum curve including ultraviolet light, visible light and infrared light in the spectrum, and the proportion of red, green and blue in the visible light part is similar to that of sunlight, and the color rendering index is close to 100. The spectrum of the sunlight can be called as full spectrum, and the color temperature of the sunlight changes along with the change of four seasons, morning and evening, so that the spectrum of the full spectrum lamp can change the color temperature along with the change of time in sequence to simulate the natural light environment and better accord with the natural growth rule of organisms.

In the prior art, the following three schemes are mainly adopted to realize full spectrum illumination.

Scheme one, single purple light chip

In the scheme, the purple light emitted by the purple light chip is used as exciting light, and the requirements of various color temperatures are met by matching different fluorescent powder in proportion, so that the fluorescent powder has the advantage of low blue light harm; however, the luminous efficiency of the proposal is not high, and the highest luminous efficiency in the industry at present is only 120lm/W because the voltage of the purple light chip is higher and the exciting light is purple light. In addition, the ultraviolet chip epitaxy has structural defects, so that the light efficiency of the ultraviolet excitation full spectrum scheme is difficult to improve, and the bottleneck of the ultraviolet full spectrum application is also existed.

Scheme two, single blue light chip

In the scheme, blue light emitted by the blue light chip is used as exciting light to realize high-apparent-value full-spectrum illumination, wherein the peak wavelength range of the blue light chip is 447nm-450nm generally. The scheme has the advantages of high luminous efficiency and high brightness, and the highest luminous efficiency can reach 160 lm/W; however, the spectrum of the scheme is discontinuous, a spectrum generation-interrupted region exists, more than 90 of the spectrum is difficult to achieve generally due to the fact that R12 has defects, the spectrum of the scheme is incomplete and discontinuous, and the range of the solar spectrum is not met.

Scheme III, double blue light chips

In the scheme, two blue light chips are connected in parallel, and different blue light emitted by the two blue light chips is used as exciting light to realize high-display-value full-spectrum illumination, wherein the peak wavelength ranges of the two blue light chips are 447nm-450nm and 457nm-460nm respectively. The scheme has the advantages of high luminous efficiency and high brightness, the highest luminous efficiency can reach 170lm/W, however, the scheme requires that the blue light chip with the low peak wavelength has high brightness, and the blue light chip with the high peak wavelength has low brightness, so that the problem of brightness matching of the LED chip is solved; and in order to satisfy full gloss register's demand, two blue light chips still need set up to size not different, consequently, the inconsistent condition of luminance can appear in two blue light chips under the same current drive, leads to this scheme can't be applied to the mixing of colors product of adjusting luminance, and the range of application is restricted, therefore this scheme promotes the degree of difficulty very big, in addition, because of the thermal resistance of two blue light chips is inconsistent, long-term use not only can produce very big light decay, still can cause the potential safety hazard.

Based on the above problem, the present invention provides an LED lamp bead, in an embodiment, as shown in fig. 1, the LED lamp bead includes:

a rack 100 having a bowl;

the LED chip 200 is arranged in the bowl cup, and the LED chip 200 can emit a plurality of blue lights with different peak wavelengths;

and the packaging adhesive is filled in the bowl cup and used for packaging the LED chip 200, and fluorescent powder is mixed in the packaging adhesive.

The LED lamp bead is internally provided with the single LED chip, but the LED chip can emit a plurality of blue lights with different peak wavelengths to be used as the exciting light of the fluorescent powder, so that the blue lights emitted by the LED chip and the light emitted by the fluorescent powder are mixed to form white light. According to different lighting requirements, a user can mix fluorescent powder with different proportions in the packaging adhesive, so that light emitted by the LED lamp beads can be close to natural light.

Specifically, in this embodiment, the single LED chip can emit a plurality of blue lights with different peak wavelengths by adjusting the epitaxial growth process of the LED chip. When a quantum well light emitting layer of the LED chip grows, different source steam of indium element is introduced at different time to generate different quantum well groups, the indium component content in the potential well layers of different quantum well groups is different, and the LED chip can also emit blue light with different peak wavelengths.

Further, in this embodiment, the peak wavelength range of any one of the blue lights that can be emitted by the LED chip is 400nm to 485nm, and in practical applications, a technician may select a suitable peak wavelength range according to different lighting requirements.

Further, in this embodiment, the phosphor includes a green phosphor, and the green phosphor includes GaYAG powder. The green phosphor powder is excited by the partial superposition blue light that the LED chip sent for the green glow, and this green glow mixes with other blue light to make LED lamp pearl send white light, in addition, the green phosphor powder can also make harmful shortwave blue light peak wavelength red-shift, in order to play the effect of protection eyes, and especially, GaYAG powder can also promote the color rendering index of this LED lamp pearl among the green phosphor powder. Of course, in other embodiments, the phosphor may also include a yellow YAG phosphor.

Further, in this embodiment, phosphor powder includes red phosphor powder, and red phosphor powder can be aroused as ruddiness by the partial superpose blue light that the LED chip sent, and this ruddiness mixes with the light of other colours, can further promote the spectrum continuity of this LED lamp pearl, and in addition, red phosphor powder also can make harmful shortwave blue light peak wavelength red-shift to further filter harmful shortwave blue light.

Further, in this embodiment, the peak wavelength range of the green phosphor is 510nm to 545nm, and the peak wavelength range of the red phosphor is 610nm to 670nm, and green phosphors and/or red phosphors with different peak wavelengths may be configured corresponding to blue lights with different peak wavelengths emitted by different LED chips, so that the LED lamp bead can realize full spectrum illumination with high color rendering index.

Further, in this embodiment, the green phosphor further includes chloride powder to further improve the color rendering index of the LED lamp bead.

Further, in this embodiment, the weight of the green phosphor accounts for 75% to 85% of the total weight of the phosphor, and the weight of the red phosphor accounts for 15% to 25% of the total weight of the phosphor. In practical application, technicians can adjust different fluorescent powder proportions according to different lighting requirements so as to realize full-spectrum lighting with high color rendering index.

Without loss of generality, in this embodiment, taking an LED lamp bead with a color temperature of 4000K as an example, first, blue light with two peak wavelengths should be superimposed on an LED chip, where the two peak wavelengths should be 447nm and 457nm, respectively, and further, by adjusting an LED chip epitaxy process, a dominant wavelength of the superimposed blue light emitted by the LED chip is 463nm and a peak wavelength is 454nm, where a spectrogram of the superimposed blue light is shown in fig. 3.

In addition, a mixture of the DM541L chlorine GaYAG powder and the red phosphor powder is adopted, wherein the DM541L chlorine GaYAG powder is a green phosphor powder containing chloride salt, the DM541L chlorine GaYAG powder has a peak wavelength of 541nm, the red phosphor powder has a peak wavelength of 655nm, and the weight ratio of the DM541L chlorine GaYAG powder to the red phosphor powder is 4: 1, namely the weight percentage of the DM541L chlorine GaYAG powder is 80 percent, and the weight percentage of the red fluorescent powder is 20 percent.

Therefore, the LED lamp bead can realize full-spectrum illumination with high color rendering index and good spectrum continuity, and the spectrogram of the LED lamp bead is shown in fig. 4. The LED lamp bead has the advantages that the peak wavelength is 627nm, the dominant wavelength is 579nm, the color rendering index Ra is 95.4, and the numerical values from R1 to R15 are as follows:

R1＝97.25，R2＝96.12，R3＝96.77，R4＝93.78，R5＝96.14，R6＝95.01，R7＝93.37，R8＝94.69，R9＝97.78，R10＝93.01，R11＝96.57，R12＝96.75，R13＝96.61，R14＝98.53，R15＝95.71。

in the embodiment, the color rendering index is larger than 95 and is very close to natural light, and the monochromatic color rendering indexes R1-R15 are larger than 90, so that the LED lamp bead can correctly express the original color of a substance, and high-quality natural light-like illumination can be realized, so that the visual fatigue can be reduced, and the color weakness risk can be reduced.

In addition, the rated light efficiency of the LED lamp bead is 152.8lm/W, the actual light efficiency of the LED lamp bead can also reach 115.4lm/W in consideration of factors such as circuit loss and secondary optical loss, and the actual light efficiency is far larger than 100lm/W required by the industry standard, so that the spectrum of the LED lamp bead also has the advantage of high light efficiency.

Further, in the present embodiment, as shown in fig. 1 and fig. 2, the bracket 100 includes a plastic wall 110 for forming a side wall of the bowl, and a plastic bottom wall 120 for covering a bottom of the bowl, wherein the plastic wall 110 and the plastic bottom wall 120 are integrally formed by white plastic; the plastic bottom wall 120 is provided with a first avoidance hole 121 for installing the LED chip 200, and two second avoidance holes 122 corresponding to the positive welding position and the negative welding position, respectively.

Specifically, as shown in fig. 1, the plastic bottom wall 120 is provided with a connecting portion 123, and the bottom of the bowl is provided with a limiting hole 130 corresponding to the connecting portion 123, so that the integrally formed plastic wall 110 and the plastic bottom wall 120 are fixedly connected to the bottom of the bowl.

In the prior art, when the bracket 100 is stored in a warehouse as a production material, most of the bottom of the bowl is exposed in the air, the bottom of the bowl is generally a copper plate with a silver electroplating layer covered on the surface, and the silver electroplating layer is easy to react with oxygen and sulfide in the air to generate silver oxide and silver sulfide, so that the bottom of the bowl is easily blackened, and the luminous effect of the finished product of the LED lamp bead is affected.

In this embodiment, the bottom of the bowl is covered with the plastic bottom wall 120, on one hand, the contact area between the silver coating of the bottom of the bowl and oxygen or sulfide can be reduced, and the bottom of the bowl is prevented from being directly exposed to air, so that the bottom of the bowl is protected; on the other hand, the air tightness of the support 100 can be improved, and the support 100 is prevented from absorbing moisture, so that the quality stability of the support 100 is improved. Moreover, the plastic bottom wall 120 that so sets up still can reduce the point volume of gluing of encapsulation in the bowl cup, can promote the point of this LED lamp pearl and glue speed to make the productivity of this LED lamp pearl obtain promoting. In particular, the plastic wall 110 and the plastic bottom wall 120 are preferably made of PPA (Polyphthalamide), which has the advantages of high hardness, high strength, good chemical resistance and low cost.

In addition, a first avoiding hole 121 and two second avoiding holes 122 are formed in the plastic bottom wall 120, the LED chip 200 is mounted at the bottom of the bowl cup through the first avoiding hole 121, as shown in fig. 1, two leads 300 are further disposed in the bowl cup and are respectively used for electrically connecting the LED chip 200 to the positive welding position and the negative welding position, welding between one ends of the two leads 300 and the LED chip 200 can be performed through the first avoiding hole 121, and welding between the other ends of the two leads 300 and the positive welding position and the negative welding position can be performed through the two second avoiding holes 122.

Further, in the present embodiment, as shown in fig. 1, the aperture of the second avoiding hole 122 is gradually increased in a direction toward the rim of the bowl. In manufacturing, need to be connected to the anodal welding position and the negative pole welding position of bowl cup bottom respectively with the one end of two lead wires 300, the aperture that the hole 122 was dodged to the second is the crescent setting in the direction of bowl cup rim of a cup, not only is favorable to this end of this lead wire 300 to extend anodal welding position or negative pole welding position, still is favorable to welding this end of lead wire 300 in anodal welding position or negative pole welding position to promote the manufacturability of this LED lamp pearl, thereby further promote the productivity of this LED lamp pearl.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a LED lamp pearl which characterized in that includes:

a rack having a bowl;

2. The LED lamp bead of claim 1, wherein the peak wavelength range of any one of the blue light emitted by the LED chip is 400nm-485 nm.

3. The LED lamp bead of claim 1, wherein the phosphor comprises a green phosphor comprising GaYAG powder.

4. The LED lamp bead of claim 3, wherein the peak wavelength range of the green phosphor is 510nm-545 nm.

5. The LED lamp bead of claim 3, wherein the green phosphor further comprises a chloride salt powder.

6. The LED lamp bead of claim 3, wherein the weight of the green phosphor accounts for 75% -85% of the total weight of the phosphor.

7. The LED lamp bead of claim 1, wherein the phosphor comprises a red phosphor having a peak wavelength in the range of 610nm to 670 nm.

8. The LED lamp bead of claim 7, wherein the weight of the red phosphor accounts for 15% -25% of the total weight of the phosphor.

9. The LED lamp bead according to any one of claims 1 to 8, wherein the support comprises a plastic wall for forming a side wall of the bowl, and a plastic bottom wall for covering a bottom of the bowl, the plastic wall and the plastic bottom wall being integrally formed of white plastic;

the plastic bottom wall is provided with a first avoidance hole for mounting the LED chip and two second avoidance holes respectively corresponding to the anode welding position and the cathode welding position.

10. The LED lamp bead of claim 9, wherein the aperture of the second avoiding hole is gradually increased in a direction toward the rim of the bowl cup.